LinuxLists.cc - linux-next: Tree for Aug 26

2020-08-26 06:34:48

Subject: linux-next: Tree for Aug 26

Hi all,

News: There will be no linux-next releases next Monday or Tuesday.

Changes since 20200825:

The bpf-next tree lost its build failure.

The drm-misc tree gained conflicts against Linus' tree and the amdgpu
tree. It also gained a semantic conflict against the drm-misc-fixes tree.

Non-merge commits (relative to Linus' tree): 2773
3346 files changed, 94589 insertions(+), 35418 deletions(-)

----------------------------------------------------------------------------

I have created today's linux-next tree at
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
(patches at http://www.kernel.org/pub/linux/kernel/next/ ). If you
are tracking the linux-next tree using git, you should not use "git pull"
to do so as that will try to merge the new linux-next release with the
old one. You should use "git fetch" and checkout or reset to the new
master.

You can see which trees have been included by looking in the Next/Trees
file in the source. There are also quilt-import.log and merge.log
files in the Next directory. Between each merge, the tree was built
with a ppc64_defconfig for powerpc, an allmodconfig for x86_64, a
multi_v7_defconfig for arm and a native build of tools/perf. After
the final fixups (if any), I do an x86_64 modules_install followed by
builds for x86_64 allnoconfig, powerpc allnoconfig (32 and 64 bit),
ppc44x_defconfig, allyesconfig and pseries_le_defconfig and i386, sparc
and sparc64 defconfig and htmldocs. And finally, a simple boot test
of the powerpc pseries_le_defconfig kernel in qemu (with and without
kvm enabled).

Below is a summary of the state of the merge.

I am currently merging 328 trees (counting Linus' and 86 trees of bug
fix patches pending for the current merge release).

Stats about the size of the tree over time can be seen at
http://neuling.org/linux-next-size.html .

Status of my local build tests will be at
http://kisskb.ellerman.id.au/linux-next . If maintainers want to give
advice about cross compilers/configs that work, we are always open to add
more builds.

Thanks to Randy Dunlap for doing many randconfig builds. And to Paul
Gortmaker for triage and bug fixes.

--
Cheers,
Stephen Rothwell

$ git checkout master
$ git reset --hard stable
Merging origin/master (abb3438d69fb Merge tag 'm68knommu-for-v5.9-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu)
Merging fixes/master (9123e3a74ec7 Linux 5.9-rc1)
Merging kbuild-current/fixes (510bc3cb1ddc kconfig: qconf: replace deprecated QString::sprintf() with QTextStream)
Merging arc-current/for-curr (37016ab49214 irqchip/eznps: Fix build error for !ARC700 builds)
Merging arm-current/fixes (5c6360ee4a0e ARM: 8988/1: mmu: fix crash in EFI calls due to p4d typo in create_mapping_late())
Merging arm64-fixes/for-next/fixes (8d75785a8142 ARM64: vdso32: Install vdso32 from vdso_install)
Merging arm-soc-fixes/arm/fixes (9c8b0a9c37b7 Merge tag 'imx-fixes-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/shawnguo/linux into arm/fixes)
Merging uniphier-fixes/fixes (48778464bb7d Linux 5.8-rc2)
Merging drivers-memory-fixes/fixes (7ff3a2a626f7 memory: jz4780_nemc: Fix an error pointer vs NULL check in probe())
Merging m68k-current/for-linus (382f429bb559 m68k: defconfig: Update defconfigs for v5.8-rc3)
Merging powerpc-fixes/fixes (64ef8f2c4791 powerpc/perf/hv-24x7: Move cpumask file to top folder of hv-24x7 driver)
Merging s390-fixes/fixes (b97bf44f9915 s390/pci: fix PF/VF linking on hot plug)
Merging sparc/master (0a95a6d1a4cd sparc: use for_each_child_of_node() macro)
Merging fscrypt-current/for-stable (2b4eae95c736 fscrypt: don't evict dirty inodes after removing key)
Merging net/master (2c6500e82e51 net: ethernet: ti: cpsw_new: fix clean up of vlan mc entries for host port)
Merging bpf/master (7787b6fc938e bpf, sysctl: Let bpf_stats_handler take a kernel pointer buffer)
Merging ipsec/master (4eb2e1341575 espintcp: restore IP CB before handing the packet to xfrm)
Merging netfilter/master (3622adb02623 ipv6: ndisc: adjust ndisc_ifinfo_sysctl_change prototype)
Merging ipvs/master (7c7ab580db49 net: Convert to use the fallthrough macro)
Merging wireless-drivers/master (9a2a0862d973 brcmfmac: reserve tx credit only when txctl is ready to send)
Merging mac80211/master (fce2ff728f95 nl80211: fix NL80211_ATTR_HE_6GHZ_CAPABILITY usage)
Merging rdma-fixes/for-rc (60b1af64eb35 RDMA/rxe: Fix the parent sysfs read when the interface has 15 chars)
Merging sound-current/for-linus (eed8f88b109a Revert "ALSA: hda: Add support for Loongson 7A1000 controller")
Merging sound-asoc-fixes/for-linus (d062085d61b1 ASoC: ti: fixup ams_delta_mute() function name)
Merging regmap-fixes/for-linus (d012a7190fc1 Linux 5.9-rc2)
Merging regulator-fixes/for-linus (3bec5b6aae83 Merge tag 'v5.9-rc2' into regulator-5.9)
Merging spi-fixes/for-linus (d1770b49661f Merge remote-tracking branch 'spi/for-5.9' into spi-linus)
Merging pci-current/for-linus (7c2308f79fc8 PCI/P2PDMA: Fix build without DMA ops)
Merging driver-core.current/driver-core-linus (9123e3a74ec7 Linux 5.9-rc1)
Merging tty.current/tty-linus (ea1fc02e12b6 tty: serial: imx: add dependence and build for earlycon)
Merging usb.current/usb-linus (23e26d057753 usb: typec: tcpm: Fix Fix source hard reset response for TDA 2.3.1.1 and TDA 2.3.1.2 failures)
Merging usb-gadget-fixes/fixes (bc9a2e226ea9 usb: dwc3: gadget: Handle ZLP for sg requests)
Merging usb-serial-fixes/usb-linus (6ccc48e0eb2f USB: serial: ftdi_sio: add IDs for Xsens Mti USB converter)
Merging usb-chipidea-fixes/ci-for-usb-stable (2d79b3360dcc usb: chipidea: core: add wakeup support for extcon)
Merging phy/fixes (afd55e6d1bd3 phy: qcom-qmp: Use correct values for ipq8074 PCIe Gen2 PHY init)
Merging staging.current/staging-linus (1dffeb8b8b4c staging: greybus: audio: fix uninitialized value issue)
Merging char-misc.current/char-misc-linus (9c97cecab0d4 Merge tag 'misc-habanalabs-fixes-2020-08-22' of git://people.freedesktop.org/~gabbayo/linux into char-misc-linus)
Merging soundwire-fixes/fixes (f8d0168e035f soundwire: bus: fix typo in comment on INTSTAT registers)
Merging thunderbolt-fixes/fixes (813050e0a9b8 thunderbolt: Use maximum USB3 link rate when reclaiming if link is not up)
Merging input-current/for-linus (9e8238020c5b Merge branch 'next' into for-linus)
Merging crypto-current/master (bfe8fe939a04 crypto: sa2ul - add Kconfig selects to fix build error)
Merging ide/master (6800cd8cbc6e ide-acpi: use %*ph to print small buffer)
Merging vfio-fixes/for-linus (aae7a75a821a vfio/type1: Add proper error unwind for vfio_iommu_replay())
Merging kselftest-fixes/fixes (5c1e4f7e9e49 selftests/timers: Turn off timeout setting)
Merging modules-fixes/modules-linus (57baec7b1b04 scripts/nsdeps: make sure to pass all module source files to spatch)
Merging dmaengine-fixes/fixes (6d6018fc30be drivers/dma/dma-jz4780: Fix race condition between probe and irq handler)
Merging backlight-fixes/for-backlight-fixes (219d54332a09 Linux 5.4)
Merging mtd-fixes/mtd/fixes (f7e6b19bc764 mtd: properly check all write ioctls for permissions)
Merging mfd-fixes/for-mfd-fixes (dddf4ddc3971 mfd: mfd-core: Ensure disabled devices are ignored without error)
Merging v4l-dvb-fixes/fixes (0d6db85131e0 Revert "media: atomisp: keep the ISP powered on when setting it")
Merging reset-fixes/reset/fixes (b460e0a9e240 reset: intel: add unspecified HAS_IOMEM dependency)
Merging mips-fixes/mips-fixes (91dbd73a1739 mips/oprofile: Fix fallthrough placement)
Merging at91-fixes/at91-fixes (54ecb8f7028c Linux 5.4-rc1)
Merging omap-fixes/fixes (6542e2b613c2 ARM: dts: omap5: Fix DSI base address and clocks)
Merging kvm-fixes/master (b5331379bc62 KVM: arm64: Only reschedule if MMU_NOTIFIER_RANGE_BLOCKABLE is not set)
Merging kvms390-fixes/master (774911290c58 KVM: s390: reduce number of IO pins to 1)
Merging hwmon-fixes/hwmon (cecf7560f00a hwmon: (applesmc) check status earlier.)
Merging nvdimm-fixes/libnvdimm-fixes (c2affe920b0e dax: do not print error message for non-persistent memory block device)
Merging btrfs-fixes/next-fixes (c9f8e44ec4a5 Merge branch 'misc-5.9' into next-fixes)
Merging vfs-fixes/fixes (9d682ea6bcc7 vboxsf: Fix the check for the old binary mount-arguments struct)
Merging dma-mapping-fixes/for-linus (7dc6fd0f3b84 Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux)
Merging i3c-fixes/master (6fbc7275c7a9 Linux 5.2-rc7)
Merging drivers-x86-fixes/fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging samsung-krzk-fixes/fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging pinctrl-samsung-fixes/pinctrl-fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging devicetree-fixes/dt/linus (5cd841d2676a dt-bindings: vendor-prefixes: Remove trailing whitespace)
Merging scsi-fixes/fixes (75d46c6d15ef scsi: scsi_debug: Remove superfluous close zone in resp_open_zone())
Merging drm-fixes/drm-fixes (d012a7190fc1 Linux 5.9-rc2)
Merging amdgpu-fixes/drm-fixes (2c409ba81be2 drm/radeon: fix si_enable_smc_cac() failed issue)
Merging drm-intel-fixes/for-linux-next-fixes (d012a7190fc1 Linux 5.9-rc2)
Merging mmc-fixes/fixes (710d4d916e6d dt-bindings: mmc: Add missing description for clk_in/out_sd1)
Merging rtc-fixes/rtc-fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging gnss-fixes/gnss-linus (48778464bb7d Linux 5.8-rc2)
Merging hyperv-fixes/hyperv-fixes (b46b4a8a57c3 hv_utils: drain the timesync packets on onchannelcallback)
Merging soc-fsl-fixes/fix (fe8fe7723a3a soc: fsl: dpio: register dpio irq handlers after dpio create)
Merging risc-v-fixes/fixes (0981b50cd6c7 riscv/mm: Simplify retry logic in do_page_fault())
Merging pidfd-fixes/fixes (bda4c60d02e9 sys: Convert to the new fallthrough notation)
Merging fpga-fixes/fixes (8614afd689df fpga: dfl: fix bug in port reset handshake)
Merging spdx/spdx-linus (9123e3a74ec7 Linux 5.9-rc1)
Merging gpio-intel-fixes/fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging pinctrl-intel-fixes/fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging erofs-fixes/fixes (9ebcfadb0610 Linux 5.8-rc3)
Merging integrity-fixes/fixes (843385694721 evm: Fix a small race in init_desc())
Merging kunit-fixes/kunit-fixes (9123e3a74ec7 Linux 5.9-rc1)
Merging ubifs-fixes/fixes (f37e99aca03f Merge tag 's390-5.8-6' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux into master)
Merging memblock-fixes/fixes (bd05220c7be3 arch/ia64: Restore arch-specific pgd_offset_k implementation)
Merging drm-misc-fixes/for-linux-next-fixes (7fd5b25499bc drm/omap: fix incorrect lock state)
Merging kspp-gustavo/for-next/kspp (df561f6688fe treewide: Use fallthrough pseudo-keyword)
Merging kbuild/for-next (514bad879fdb Merge branch 'kconfig' into for-next)
CONFLICT (content): Merge conflict in scripts/kconfig/qconf.h
Merging compiler-attributes/compiler-attributes (98d54f81e36b Linux 5.6-rc4)
Merging dma-mapping/for-next (d7e673ec2c8e dma-pool: Only allocate from CMA when in same memory zone)
Merging asm-generic/master (060dc911501f nds32: fix build failure caused by page table folding updates)
Merging arc/for-next (def9d2780727 Linux 5.5-rc7)
Merging arm/for-next (4dffbda6a996 Merge branches 'fixes' and 'misc' into for-next)
Merging arm64/for-next/core (3df14264ad99 recordmcount: Fix build failure on non arm64)
Merging arm-perf/for-next/perf (55fdc1f44cd6 arm64: perf: Expose some new events via sysfs)
Merging arm-soc/for-next (2694ca73fa41 ARM: Document merges)
Merging amlogic/for-next (c943b84fab78 Merge branch 'v5.10/dt64' into tmp/aml-rebuild)
Merging aspeed/for-next (7c32a9d95c9a ARM: dts: aspeed: wedge40: Update UART4 pin settings)
Merging at91/at91-next (b68f43873b72 Merge branch 'at91-soc' into at91-next)
Merging drivers-memory/for-next (f42ae4bbf94c memory: brcmstb_dpfe: fix array index out of bounds)
Merging imx-mxs/for-next (427954264555 Merge branch 'imx/defconfig' into for-next)
Merging keystone/next (50c950e2c8b6 Merge branch 'for_5.9/driver-soc' into next)
Merging mediatek/for-next (647a84d1e4dc Merge branch 'v5.8-next/soc' into for-next)
Merging mvebu/for-next (29bd9d8c2ac1 Merge branch 'mvebu/dt64' into mvebu/for-next)
Merging omap/for-next (390f789055a0 Merge branch 'omap-for-v5.10/dt' into for-next)
Merging qcom/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging raspberrypi/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging realtek/for-next (486f29df6941 Merge branch 'v5.8/dt' into next)
Merging renesas/next (15c95b417a9c Merge branches 'renesas-arm-defconfig-for-v5.10', 'renesas-arm-dt-for-v5.10' and 'renesas-drivers-for-v5.10' into renesas-next)
Merging reset/reset/next (2983e2385ff6 reset: imx7: add the cm4 reset for i.MX8MQ)
CONFLICT (content): Merge conflict in drivers/reset/reset-imx7.c
Merging rockchip/for-next (088d74f51158 Merge branch 'v5.9-clk/next' into for-next)
Merging samsung-krzk/for-next (f609c46be3ca Merge branch 'next/soc-s3c-cleanup' into for-next)
Merging scmi/for-linux-next (d012a7190fc1 Linux 5.9-rc2)
Merging sunxi/sunxi/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging tegra/for-next (8617339892a6 Merge branch for-5.9/arm64/dt into for-next)
Merging ti-k3/ti-k3-next (1e3d655fe7b4 Merge branch 'ti-k3-config-next' into ti-k3-next)
Merging ti-k3-new/ti-k3-next (9123e3a74ec7 Linux 5.9-rc1)
Merging uniphier/for-next (4f8fb65af529 Merge branch 'dt64' into for-next)
Merging clk/clk-next (24907ec54702 Merge branch 'clk-fixes' into clk-next)
Merging clk-samsung/for-next (3d77e6a8804a Linux 5.7)
Merging csky/linux-next (bdcd93ef9afb csky: Add context tracking support)
Merging h8300/h8300-next (8808515be0ed h8300: Replace <linux/clk-provider.h> by <linux/of_clk.h>)
Merging ia64/next (1a9d3c34c593 x86/cpu: Add Lakefield, Alder Lake and Rocket Lake to Intel family)
Merging m68k/for-next (382f429bb559 m68k: defconfig: Update defconfigs for v5.8-rc3)
Merging m68knommu/for-next (0fdaa525ea1c binfmt_flat: revert "binfmt_flat: don't offset the data start")
Merging microblaze/next (b3a9e3b9622a Linux 5.8-rc1)
Merging mips/mips-next (625326ea9c84 MIPS: Remove PNX833x alias NXP_STB22x)
Merging nds32/next (0a2e478902c7 nds32: use get_kernel_nofault in dump_mem)
Merging nios2/for-next (6b57fa4d374b nios2: signal: Mark expected switch fall-through)
Merging openrisc/for-next (55b2662ec665 openrisc: uaccess: Add user address space check to access_ok)
Merging parisc-hd/for-next (bcf876870b95 Linux 5.8)
Merging powerpc/next (9123e3a74ec7 Linux 5.9-rc1)
Merging fsl/next (a76bea0287ce powerpc/kmcent2: add ranges to the pci bridges)
Merging soc-fsl/next (e9e4ef9116b1 soc: fsl: dpio: Remove unused inline function qbman_write_eqcr_am_rt_register)
Merging risc-v/for-next (f75fa0a51b8b efi: Rename arm-init to efi-init common for all arch)
Merging s390/features (9123e3a74ec7 Linux 5.9-rc1)
Merging sh/for-next (0c64a0dce51f sh: landisk: Add missing initialization of sh_io_port_base)
Merging sparc-next/master (dd0d718152e4 Merge tag 'spi-fix-v5.8-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi)
Merging uml/linux-next (f6e8c474390b um: virtio: Replace zero-length array with flexible-array)
Merging xtensa/xtensa-for-next (a0fc1436f1f4 xtensa: add missing exclusive access state management)
Merging fscrypt/master (55e32c54bbd5 fscrypt: don't load ->i_crypt_info before it's known to be valid)
Merging afs/afs-next (8409f67b6437 afs: Adjust the fileserver rotation algorithm to reprobe/retry more quickly)
Merging btrfs/for-next (e36d3dfd9828 Merge branch 'for-next-next-v5.9-20200824' into for-next-20200824)
Merging ceph/master (496ceaf12432 ceph: don't allow setlease on cephfs)
Merging cifs/for-next (d012a7190fc1 Linux 5.9-rc2)
Merging configfs/for-next (059ccbfff8a8 configfs: use flush file op to commit writes to a binary file)
Merging ecryptfs/next (8b614cb8f1dc Merge tag '5.6-rc4-smb3-fixes' of git://git.samba.org/sfrench/cifs-2.6)
Merging erofs/dev (cfcedfe21820 erofs: avoid duplicated permission check for "trusted." xattrs)
Merging exfat/dev (34d41dbe5455 exfat: use i_blocksize() to get blocksize)
Merging ext3/for_next (de575ac602ab Pull reiserfs spelling fixes.)
Merging ext4/dev (27bc446e2def ext4: limit the length of per-inode prealloc list)
Merging f2fs/dev (da0815f3bce1 f2fs: Use generic casefolding support)
Merging fsverity/fsverity (f3db0bed4583 fs-verity: use smp_load_acquire() for ->i_verity_info)
Merging fuse/for-next (9e9e23bd2d36 fuse: update project homepage)
Merging jfs/jfs-next (7aba5dcc2346 jfs: Replace zero-length array with flexible-array member)
Merging nfs/linux-next (d012a7190fc1 Linux 5.9-rc2)
Merging nfs-anna/linux-next (65caafd0d214 SUNRPC reverting d03727b248d0 ("NFSv4 fix CLOSE not waiting for direct IO compeletion"))
Merging nfsd/nfsd-next (9123e3a74ec7 Linux 5.9-rc1)
Merging cel/cel-next (ad112aa8b1ac SUNRPC: remove duplicate include)
Merging orangefs/for-next (e848643b524b orangefs: remove unnecessary assignment to variable ret)
Merging overlayfs/overlayfs-next (4518dfcf761e ovl: fix lookup of indexed hardlinks with metacopy)
Merging ubifs/next (798b7347e4f2 jffs2: fix UAF problem)
Merging v9fs/9p-next (2ed0b7578170 9p: Remove unneeded cast from memory allocation)
Merging xfs/for-next (96cf2a2c7556 xfs: Fix UBSAN null-ptr-deref in xfs_sysfs_init)
Merging zonefs/for-next (2f4b7462d2fa zonefs: update documentation to reflect zone size vs capacity)
Merging iomap/iomap-for-next (60263d5889e6 iomap: fall back to buffered writes for invalidation failures)
Merging djw-vfs/vfs-for-next (e4f9ba20d3b8 fs/xfs: Update xfs_ioctl_setattr_dax_invalidate())
Merging file-locks/locks-next (c0842fbc1b18 random32: move the pseudo-random 32-bit definitions to prandom.h)
Merging vfs/for-next (bcf876870b95 Linux 5.8)
Merging printk/for-next (20d6ee092831 Merge branch 'for-5.10' into for-next)
Merging pci/next (9123e3a74ec7 Linux 5.9-rc1)
Merging pstore/for-next/pstore (137c6236aeec mailmap: Add WeiXiong Liao)
CONFLICT (content): Merge conflict in .mailmap
Merging hid/for-next (de11ec5fedd9 Merge branch 'for-5.9/upstream-fixes' into for-next)
Merging i2c/i2c/for-next (3f7462407ce3 Merge branch 'i2c/for-current' into i2c/for-next)
Merging i3c/i3c/next (9da36a7ec421 i3c: master add i3c_master_attach_boardinfo to preserve boardinfo)
Merging dmi/dmi-for-next (a3d13a0a23ea Replace HTTP links with HTTPS ones: DMI/SMBIOS SUPPORT)
Merging hwmon-staging/hwmon-next (314119a53803 dt-bindings: hwmon: Add bindings for ADM1266)
Merging jc_docs/docs-next (92001bc0365a Documentation: laptops: thinkpad-acpi: fix underline length build warning)
Merging v4l-dvb/master (9a538b83612c media: venus: core: Add support for opp tables/perf voting)
Merging v4l-dvb-next/master (0d6db85131e0 Revert "media: atomisp: keep the ISP powered on when setting it")
Merging fbdev/fbdev-for-next (732146a3f1dc video: fbdev: imxfb: fix a typo in imxfb_probe())
Merging pm/linux-next (4958dfca3d0f Merge branch 'pm-cpufreq' into linux-next)
Merging cpufreq-arm/cpufreq/arm/linux-next (99bcfd231280 cpufreq: tegra186: Fix initial frequency)
Merging cpupower/cpupower (527b7779e5ec cpupower: speed up generating git version string)
Merging devfreq/devfreq-next (9123e3a74ec7 Linux 5.9-rc1)
Merging opp/opp/linux-next (8c6269534d00 opp: Set required OPPs in reverse order when scaling down)
Merging thermal/thermal/linux-next (6f55be9fd5ee Merge branch 'thermal/fixes' into thermal/linux-next)
Merging thermal-rzhang/next (54ecb8f7028c Linux 5.4-rc1)
Merging thermal-soc/next (6c375eccded4 thermal: db8500: Rewrite to be a pure OF sensor)
Merging ieee1394/for-next (67f8e65e4fc1 firewire: net: remove set but not used variable 'guid')
Merging dlm/next (fa601a9ebd49 fs: dlm: implement tcp graceful shutdown)
Merging swiotlb/linux-next (4cdfb27ba80d xen/swiotlb: remember having called xen_create_contiguous_region())
CONFLICT (content): Merge conflict in drivers/xen/swiotlb-xen.c
Merging rdma/for-next (c0f4979e90ea RDMA/cm: Remove unused cm_class)
Merging net-next/master (ca65a280fb4b sunrpc: Avoid comma separated statements)
Merging bpf-next/master (cd04b04de119 selftests/bpf: Add set test to resolve_btfids)
CONFLICT (content): Merge conflict in tools/lib/bpf/libbpf.c
Merging ipsec-next/master (da7955405fb2 sfc: Fix build with CONFIG_RFS_ACCEL disabled.)
Merging mlx5-next/mlx5-next (9123e3a74ec7 Linux 5.9-rc1)
Merging netfilter-next/master (d0a84e1f38d9 ethtool: allow flow-type ether without IP protocol field)
Merging ipvs-next/master (bfdd5aaa54b0 Merge tag 'Smack-for-5.9' of git://github.com/cschaufler/smack-next)
Merging wireless-drivers-next/master (eb77802e0daa Merge ath-next from git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git)
Merging bluetooth/master (3b799254cf6f Bluetooth: hci_uart: Cancel init work before unregistering)
Merging mac80211-next/master (e5b15f5af21a Merge branch 'ptp-Add-generic-helper-functions')
Merging gfs2/for-next (e28c02b94f9e gfs2: When gfs2_dirty_inode gets a glock error, dump the glock)
Merging mtd/mtd/next (6a1380271b75 Merge tag 'nand/for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux into mtd/next)
Merging nand/nand/next (da151e3458c8 dt-bindings: mtd: fsl-upm-nand: Deprecate chip-delay and fsl, upm-wait-flags)
Merging spi-nor/spi-nor/next (e93a977367b2 mtd: revert "spi-nor: intel: provide a range for poll_timout")
Merging crypto/master (6779d0e6b0fe crypto: arm/curve25519 - include <linux/scatterlist.h>)
Merging drm/drm-next (62975d27d647 drm/ttm: revert "drm/ttm: make TT creation purely optional v3")
Merging amdgpu/drm-next (65ecc6928926 drm/amdgpu: add a wrapper for atom asic_init)
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/pm/inc/smu_v11_0.h
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/pm/inc/smu11_driver_if_sienna_cichlid.h
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/display/dc/dml/display_mode_vba.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/display/dc/core/dc_link.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/display/dc/bios/command_table2.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
Merging drm-intel/for-linux-next (ced026e959be drm/i915: Update DRIVER_DATE to 20200824)
Merging drm-tegra/drm/tegra/for-next (4fba6d22ca9a drm/tegra: plane: Support 180° rotation)
Merging drm-misc/for-linux-next (ebb21aa1882f drm/ttm: drop bus.size from bus placement.)
CONFLICT (content): Merge conflict in drivers/video/fbdev/savage/savagefb_driver.c
CONFLICT (content): Merge conflict in drivers/video/fbdev/atmel_lcdfb.c
CONFLICT (content): Merge conflict in drivers/video/fbdev/arcfb.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/amdgpu/amdgpu_vram_mgr.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
CONFLICT (content): Merge conflict in drivers/gpu/drm/amd/amdgpu/amdgpu_gtt_mgr.c
Applying: fix interaction with drm-misc-fix commit
Merging drm-msm/msm-next (5e0c22d4a9dd drm/msm/a6xx: fix frequency not always being restored on GMU resume)
Merging mali-dp/for-upstream/mali-dp (f634c6a80287 dt/bindings: display: Add optional property node define for Mali DP500)
Merging imx-drm/imx-drm/next (efd5a93d2a89 drm/imx: drop explicit drm_mode_config_cleanup)
Merging etnaviv/etnaviv/next (c5d5a32ead1e drm/etnaviv: fix ref count leak via pm_runtime_get_sync)
Merging regmap/for-next (d012a7190fc1 Linux 5.9-rc2)
Merging sound/for-next (14b51ccd2674 ALSA: usb-audio: Correct wrongly matching entries with audio class)
Merging sound-asoc/for-next (cd018773c645 Merge remote-tracking branch 'asoc/for-5.10' into asoc-next)
Merging modules/modules-next (262e6ae7081d modules: inherit TAINT_PROPRIETARY_MODULE)
Merging input/next (9b5fbad1dcee Input: MT - avoid comma separated statements)
Merging block/for-next (86cfccb66937 Merge tag 'dlm-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm)
Merging device-mapper/for-next (a9cb9f4148ef dm: don't call report zones for more than the user requested)
Merging pcmcia/pcmcia-next (46d079790663 pcmcia: make pccard_loop_tuple() static)
Merging mmc/next (10a70e0d4edd Merge branch 'fixes' into next)
Merging mfd/for-mfd-next (c563a66537d2 mfd: rn5t618: Add a power supply subdevice)
Merging backlight/for-backlight-next (7eb99a39ef76 video: backlight: cr_bllcd: Remove unused variable 'intensity')
Merging battery/for-next (ef805f217709 dt-bindings: power: reset: Convert reboot-mode to YAML)
Merging regulator/for-next (79bb4ac46a7f Merge remote-tracking branch 'regulator/for-5.10' into regulator-next)
Merging security/next-testing (bc62d68e2a0a device_cgroup: Fix RCU list debugging warning)
Merging apparmor/apparmor-next (e37986097ba6 apparmor: Use true and false for bool variable)
Merging integrity/next-integrity (d012a7190fc1 Linux 5.9-rc2)
Merging keys/keys-next (b6f61c314649 keys: Implement update for the big_key type)
Merging safesetid/safesetid-next (0476c865ded6 LSM: SafeSetID: Fix warnings reported by test bot)
Merging selinux/next (1b8b31a2e612 selinux: convert policy read-write lock to RCU)
Merging smack/next (42a2df3e829f Smack: prevent underflow in smk_set_cipso())
Merging tomoyo/master (9123e3a74ec7 Linux 5.9-rc1)
Merging tpmdd/next (9123e3a74ec7 Linux 5.9-rc1)
Merging watchdog/master (18445bf405cb Merge tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi)
Merging iommu/next (e46b3c0d011e Merge tag 'arm-smmu-updates' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next)
Merging vfio/next (ccd59dce1a21 vfio/type1: Refactor vfio_iommu_type1_ioctl())
Merging audit/next (265c32072b0c audit: uninitialize variable audit_sig_sid)
Merging devicetree/for-next (7ba58fff001d dt-bindings: Validate DT binding schema in a single call)
Merging mailbox/mailbox-for-next (884996986347 mailbox: mediatek: cmdq: clear task in channel before shutdown)
Merging spi/for-next (410c081be7ac Merge remote-tracking branch 'spi/for-5.10' into spi-next)
Merging tip/auto-latest (21f294e9c2da Merge branch 'perf/core')
Merging clockevents/timers/drivers/next (9fba22584e54 clocksource: Ingenic: Add support for the Ingenic X1000 OST.)
Merging edac/edac-for-next (e9b46cc8e3eb Merge branch 'edac-misc' into edac-for-next)
Merging irqchip/irq/irqchip-next (821fc9e261f3 irqchip/ingenic: Leave parent IRQ unmasked on suspend)
Merging ftrace/for-next (38ce2a9e33db tracing: Add trace_array_init_printk() to initialize instance trace_printk() buffers)
Merging rcu/rcu/next (72cc80705122 rcu: Remove unused "cpu" parameter from rcu_report_qs_rdp())
Merging kvm/linux-next (e792415c5d3e KVM: MIPS/VZ: Fix build error caused by 'kvm_run' cleanup)
Merging kvm-arm/next (16314874b12b Merge branch 'kvm-arm64/misc-5.9' into kvmarm-master/next)
Merging kvm-ppc/kvm-ppc-next (81ab595ddd3c KVM: PPC: Book3S HV: Rework secure mem slot dropping)
Merging kvms390/next (23a60f834406 s390/kvm: diagnose 0x318 sync and reset)
Merging xen-tip/linux-next (ee87e1557c42 Fix build error when CONFIG_ACPI is not set/enabled:)
Merging percpu/for-next (4fa640dc5230 Merge tag 'vfio-v5.8-rc7' of git://github.com/awilliam/linux-vfio into master)
Merging workqueues/for-next (10cdb1575954 workqueue: use BUILD_BUG_ON() for compile time test instead of WARN_ON())
Merging drivers-x86/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging chrome-platform/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging hsi/for-next (bb6d3fb354c5 Linux 5.6-rc1)
Merging leds/for-next (242b81170fb8 leds: lp50xx: Add the LP50XX family of the RGB LED driver)
Merging ipmi/for-next (83dea1285672 char: ipmi: convert tasklets to use new tasklet_setup() API)
Merging driver-core/driver-core-next (9123e3a74ec7 Linux 5.9-rc1)
Merging usb/usb-next (28157b8c7d9a USB: Better name for __check_usb_generic())
Merging usb-gadget/next (f5e46aa4a124 usb: dwc3: gadget: when the started list is empty stop the active xfer)
Merging usb-serial/usb-next (9123e3a74ec7 Linux 5.9-rc1)
Merging usb-chipidea-next/ci-for-usb-next (58a3cefb3840 usb: chipidea: imx: add two samsung picophy parameters tuning implementation)
Merging phy-next/next (c42dcb195b2f phy: ti: j721e-wiz: Remove duplicate include)
Merging tty/tty-next (52c3c3a59234 Revert "vc_screen: extract vcs_read_buf_header")
Merging char-misc/char-misc-next (d162219c655c mei: virtio: virtualization frontend driver)
Merging extcon/extcon-next (57a3706b02e2 extcon: Replace HTTP links with HTTPS ones)
Merging soundwire/next (08abad9f45f1 soundwire: intel: refine runtime pm for SDW_INTEL_CLK_STOP_BUS_RESET)
Merging thunderbolt/next (d012a7190fc1 Linux 5.9-rc2)
Merging staging/staging-next (bc752d2f345b staging: hikey9xx: Kconfig: add regulator dependency)
Merging mux/for-next (05f19f7f8944 mux: adgs1408: Add mod_devicetable.h and remove of_match_ptr)
Merging icc/icc-next (12a400b016ab interconnect: Mark all dummy functions as static inline)
Merging dmaengine/next (78a2f92e4c4a dmaengine: axi-dmac: add support for reading bus attributes from registers)
Merging cgroup/for-next (936f2a70f207 cgroup: add cpu.stat file to root cgroup)
Merging scsi/for-next (7b08f25e38ce Merge branch 'misc' into for-next)
Merging scsi-mkp/for-next (32417d7844ab scsi: esas2r: Remove unnecessary casts)
CONFLICT (content): Merge conflict in drivers/scsi/ufs/ufshcd.c
Merging vhost/linux-next (8a7c3213db06 vdpa/mlx5: fix up endian-ness for mtu)
Merging rpmsg/for-next (ca69dba7f13a Merge branches 'hwspinlock-next', 'rpmsg-next' and 'rproc-next' into for-next)
Merging gpio/for-next (22cc422070d9 gpio: wcove: Request IRQ after all initialisation done)
Merging gpio-brgl/gpio/for-next (01e8d85b68fd gpio: aggregator: Refactor ->{get, set}_multiple() to make Sparse happy)
Merging gpio-intel/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging pinctrl/for-next (fc80c51fd4b2 Merge tag 'kbuild-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild)
Merging pinctrl-intel/for-next (04d53068508e pinctrl: intel: Update header block to reflect direct dependencies)
Merging pinctrl-samsung/for-next (9123e3a74ec7 Linux 5.9-rc1)
Merging pwm/for-next (6ced5ff0be8e pwm: bcm-iproc: handle clk_get_rate() return)
Merging userns/for-next (7fce69dff8db Implement kernel_execve)
Merging ktest/for-next (ff131efff141 ktest.pl: Fix spelling mistake "Cant" -> "Can't")
Merging random/dev (ab9a7e27044b random: avoid warnings for !CONFIG_NUMA builds)
Merging kselftest/next (9123e3a74ec7 Linux 5.9-rc1)
Merging y2038/y2038 (c4e71212a245 Revert "drm/etnaviv: reject timeouts with tv_nsec >= NSEC_PER_SEC")
Merging livepatching/for-next (bf14b015bf51 Merge branch 'for-5.9/selftests-cleanup' into for-next)
Merging coresight/next (ff1304be0a05 coresight: etm4x: Add Support for HiSilicon ETM device)
Merging rtc/rtc-next (9123e3a74ec7 Linux 5.9-rc1)
Merging nvdimm/libnvdimm-for-next (03b68d5d7d4b Merge branch 'for-5.9/copy_mc' into libnvdimm-for-next)
Merging at24/at24/for-next (99363d1c26c8 eeprom: at24: Tidy at24_read())
Merging ntb/ntb-next (b8e2c8bbdf77 NTB: Use struct_size() helper in devm_kzalloc())
Merging seccomp/for-next/seccomp (16b89f695313 net/scm: Fix typo in SCM_RIGHTS compat refactoring)
Merging kspp/for-next/kspp (55dde35fdb7f overflow: Add __must_check attribute to check_*() helpers)
Merging gnss/gnss-next (48778464bb7d Linux 5.8-rc2)
Merging fsi/next (4ca8b73f16f0 fsi: aspeed: Support CFAM reset GPIO)
Merging slimbus/for-next (b3a9e3b9622a Linux 5.8-rc1)
Merging nvmem/for-next (a24ef5be460b nvmem: qcom-spmi-sdam: Enable multiple devices)
CONFLICT (add/add): Merge conflict in Documentation/devicetree/bindings/nvmem/qcom,qfprom.yaml
Merging xarray/xarray (27586ca786a7 XArray: Handle retry entries within xas_find_marked)
Merging hyperv/hyperv-next (49971e6bad2d drivers: hv: remove cast from hyperv_die_event)
Merging auxdisplay/auxdisplay (46d4a403a04c auxdisplay: Replace HTTP links with HTTPS ones)
Merging kgdb/kgdb/for-next (2c308ef41351 kgdb: Make "kgdbcon" work properly with "kgdb_earlycon")
Merging pidfd/for-next (da83d0cb9237 Merge branch 'cap_checkpoint_restore' into for-next)
Merging hmm/hmm (9123e3a74ec7 Linux 5.9-rc1)
Merging fpga/for-next (8a5de2de0339 fpga: dfl: change data type of feature id to u16)
Merging kunit/test (9123e3a74ec7 Linux 5.9-rc1)
Merging generic-ioremap/for-next (4bdc0d676a64 remove ioremap_nocache and devm_ioremap_nocache)
Merging cfi/cfi/next (11399346ac39 mtd: Replace zero-length array with flexible-array)
Merging kunit-next/kunit (9123e3a74ec7 Linux 5.9-rc1)
Merging trivial/for-next (c1a371cf80fb printk: fix global comment)
Merging zx2c4/for-next (16fbf79b0f83 Linux 5.6-rc7)
Merging mhi/mhi-next (18e9533ac877 bus: mhi: core: Introduce APIs to allocate and free the MHI controller)
Merging notifications/notifications-pipe-core (841a0dfa5113 watch_queue: sample: Display mount tree change notifications)
Merging memblock/for-next (762d4d1a174c arch/ia64: Restore arch-specific pgd_offset_k implementation)
Merging init/init-user-pointers (38b082236e77 initramfs: use vfs_utimes in do_copy)
Merging akpm-current/current (e1df8eee6374 ROMFS: support inode blocks calculation)
$ git checkout -b akpm remotes/origin/akpm/master
$ git rebase --onto master remotes/origin/akpm/master-base
Merging akpm/master (47218ce75033 mm/mmap: add inline munmap_vma_range() for code readability)

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2020-08-26 17:47:21

On Thu, 3 Sep 2020 at 18:14, Paul E. McKenney <[email protected]> wrote:
>
> On Thu, Sep 03, 2020 at 10:39:10AM +0200, Anders Roxell wrote:
> > Hi Paul,
> >
> > On Sat, 29 Aug 2020 at 00:59, Paul E. McKenney <[email protected]> wrote:
> > >
> > > On Fri, Aug 28, 2020 at 09:24:19PM +0200, Anders Roxell wrote:
> > > > On Fri, 28 Aug 2020 at 15:29, Paul E. McKenney <[email protected]> wrote:
> > > > >
> > > > > On Fri, Aug 28, 2020 at 09:37:17AM +0200, Anders Roxell wrote:
> > > > > > On Wed, 26 Aug 2020 at 21:39, Paul E. McKenney <[email protected]> wrote:
> > > > > > >
> > > > > > > On Wed, Aug 26, 2020 at 08:19:01PM +0200, Anders Roxell wrote:
> > > > > > > > On Wed, 26 Aug 2020 at 08:33, Stephen Rothwell <[email protected]> wrote:
> > > > > > >
> > > > > > > [ . . . ]
> > > > > > >
> > > > > > > > I've built and run an arm64 allmodconfig kernel where I use the
> > > > > > > > defconfig as the base, I do this for testing purposes.
> > > > > > > > I can see the following call trace [1]:
> > > > > > > >
> > > > > > > > [ 2595.811453][ T1] Running tests on all trace events:
> > > > > > > > [ 2595.860933][ T1] Testing all events:
> > > > > > > > [ 4316.066072][ T8] kworker/dying (8) used greatest stack depth:
> > > > > > > > 27056 bytes left
> > > > > > > > [ 8561.924871][ C0] watchdog: BUG: soft lockup - CPU#0 stuck for
> > > > > > > > 22s! [migration/0:14]
> > > > > > > > [ 8561.934498][ C0] Modules linked in:
> > > > > > > > [ 8561.942303][ C0] irq event stamp: 4044
> > > > > > > > [ 8561.949044][ C0] hardirqs last enabled at (4043):
> > > > > > > > [<ffffa000126b530c>] _raw_spin_unlock_irqrestore+0xac/0x138
> > > > > > > > [ 8561.960848][ C0] hardirqs last disabled at (4044):
> > > > > > > > [<ffffa000126a89f8>] __schedule+0xf8/0x7e0
> > > > > > > > [ 8561.971418][ C0] softirqs last enabled at (3698):
> > > > > > > > [<ffffa00010001b04>] __do_softirq+0x524/0x5f8
> > > > > > > > [ 8561.982191][ C0] softirqs last disabled at (3689):
> > > > > > > > [<ffffa000101216c8>] __irq_exit_rcu+0x128/0x1a0
> > > > > > > > [ 8561.993068][ C0] CPU: 0 PID: 14 Comm: migration/0 Tainted: G
> > > > > > > > W 5.9.0-rc2-next-20200826-00005-g24628bb4c0bf #1
> > > > > > > > [ 8562.005684][ C0] Hardware name: linux,dummy-virt (DT)
> > > > > > > > [ 8562.013247][ C0] pstate: 80400005 (Nzcv daif +PAN -UAO BTYPE=--)
> > > > > > > > [ 8562.021657][ C0] pc : arch_local_irq_enable+0x58/0x80
> > > > > > > > [ 8562.029323][ C0] lr : _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > [ 8562.036739][ C0] sp : ffff0000698efaa0
> > > > > > > > [ 8562.042984][ C0] x29: ffff0000698efaa0 x28: ffff00006ad0f270
> > > > > > > > [ 8562.053814][ C0] x27: ffff00006ad0f248 x26: ffff0000698d4718
> > > > > > > > [ 8562.064687][ C0] x25: ffff00006ad0e798 x24: ffffa000139e3a40
> > > > > > > > [ 8562.075506][ C0] x23: 0000000000000001 x22: ffffa000154f5000
> > > > > > > > [ 8562.086425][ C0] x21: ffff00006ad0e798 x20: ffff00006ad0e780
> > > > > > > > [ 8562.097255][ C0] x19: ffffa000126a905c x18: 00000000000014c0
> > > > > > > > [ 8562.108071][ C0] x17: 0000000000001500 x16: 0000000000001440
> > > > > > > > [ 8562.118918][ C0] x15: 00000000f1f1f1f1 x14: 003d090000000000
> > > > > > > > [ 8562.129739][ C0] x13: 00003d0900000000 x12: ffff80000d31df41
> > > > > > > > [ 8562.140544][ C0] x11: 1fffe0000d31df40 x10: ffff80000d31df40
> > > > > > > > [ 8562.151366][ C0] x9 : dfffa00000000000 x8 : ffff0000698efa07
> > > > > > > > [ 8562.162247][ C0] x7 : 0000000000000001 x6 : 00007ffff2ce20c0
> > > > > > > > [ 8562.173072][ C0] x5 : ffff0000698d4040 x4 : dfffa00000000000
> > > > > > > > [ 8562.183954][ C0] x3 : ffffa0001040f904 x2 : 0000000000000007
> > > > > > > > [ 8562.194811][ C0] x1 : ffffa00014080000 x0 : 00000000000000e0
> > > > > > > > [ 8562.205858][ C0] Call trace:
> > > > > > > > [ 8562.211739][ C0] arch_local_irq_enable+0x58/0x80
> > > > > > > > [ 8562.219076][ C0] _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > [ 8562.226394][ C0] __schedule+0x75c/0x7e0
> > > > > > > > [ 8562.233074][ C0] preempt_schedule_notrace+0x64/0xc0
> > > > > > > > [ 8562.268210][ C0] ftrace_ops_list_func+0x494/0x4e0
> > > > > > > > [ 8562.275735][ C0] ftrace_graph_call+0x0/0x4
> > > > > > > > [ 8562.282647][ C0] preempt_count_add+0xc/0x240
> > > > > > > > [ 8562.289686][ C0] schedule+0xe4/0x160
> > > > > > > > [ 8562.296187][ C0] smpboot_thread_fn+0x47c/0x540
> > > > > > > > [ 8562.303377][ C0] kthread+0x23c/0x260
> > > > > > > > [ 8562.309906][ C0] ret_from_fork+0x10/0x18
> > > > > > > > [ 8562.316604][ C0] Kernel panic - not syncing: softlockup: hung tasks
> > > > > > > > [ 8562.325230][ C0] CPU: 0 PID: 14 Comm: migration/0 Tainted: G
> > > > > > > > W L 5.9.0-rc2-next-20200826-00005-g24628bb4c0bf #1
> > > > > > > > [ 8562.337861][ C0] Hardware name: linux,dummy-virt (DT)
> > > > > > > > [ 8562.345374][ C0] Call trace:
> > > > > > > > [ 8562.351228][ C0] dump_backtrace+0x0/0x320
> > > > > > > > [ 8562.358070][ C0] show_stack+0x38/0x60
> > > > > > > > [ 8562.364728][ C0] dump_stack+0x1c0/0x280
> > > > > > > > [ 8562.371447][ C0] panic+0x32c/0x614
> > > > > > > > [ 8562.377868][ C0] watchdog_timer_fn+0x49c/0x560
> > > > > > > > [ 8562.385076][ C0] __run_hrtimer+0x1cc/0x360
> > > > > > > > [ 8562.392021][ C0] __hrtimer_run_queues+0x1a0/0x220
> > > > > > > > [ 8562.399500][ C0] hrtimer_interrupt+0x1f8/0x440
> > > > > > > > [ 8562.406807][ C0] arch_timer_handler_virt+0x68/0xa0
> > > > > > > > [ 8562.414338][ C0] handle_percpu_devid_irq+0x118/0x2a0
> > > > > > > > [ 8562.421992][ C0] __handle_domain_irq+0x150/0x1c0
> > > > > > > > [ 8562.429315][ C0] gic_handle_irq+0x98/0x120
> > > > > > > > [ 8562.436297][ C0] el1_irq+0xd4/0x1c0
> > > > > > >
> > > > > > > We appear to have taken an interrupt here, just after releasing
> > > > > > > an irq-disabled lock and enabling interrupts.
> > > > > > >
> > > > > > > > [ 8562.442748][ C0] arch_local_irq_enable+0x58/0x80
> > > > > > > > [ 8562.450116][ C0] _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > [ 8562.457360][ C0] __schedule+0x75c/0x7e0
> > > > > > > > [ 8562.464142][ C0] preempt_schedule_notrace+0x64/0xc0
> > > > > > > > [ 8562.471745][ C0] ftrace_ops_list_func+0x494/0x4e0
> > > > > > > > [ 8562.479195][ C0] ftrace_graph_call+0x0/0x4
> > > > > > > > [ 8562.486159][ C0] preempt_count_add+0xc/0x240
> > > > > > > > [ 8562.493210][ C0] schedule+0xe4/0x160
> > > > > > >
> > > > > > > We are trying to sleep, so we took a pass through the scheduler and
> > > > > > > did some tracing.
> > > > > > >
> > > > > > > > [ 8562.499737][ C0] smpboot_thread_fn+0x47c/0x540
> > > > > > >
> > > > > > > Here we might be bringing up a CPU? Except that according to your
> > > > > > > dmesg, there is only one CPU. ("RCU restricting CPUs from NR_CPUS=256
> > > > > > > to nr_cpu_ids=1"). So this seems unlikely.
> > > > > > >
> > > > > > > Huh. The first dmesg in output-next-20200826.log is instead a
> > > > > > > DEBUG_LOCKS_WARN_ON() from lockdep. Might this be related? Or do you
> > > > > > > also see this warning when boot happens quickly?
> > > > > > >
> > > > > > > (I do see the soft lockup later on.)
> > > > > > >
> > > > > > > > [ 8562.506960][ C0] kthread+0x23c/0x260
> > > > > > > > [ 8562.513496][ C0] ret_from_fork+0x10/0x18
> > > > > > > > [ 8562.521052][ C0] Kernel Offset: disabled
> > > > > > > > [ 8562.527725][ C0] CPU features: 0x0240002,20002004
> > > > > > > > [ 8562.534950][ C0] Memory Limit: none
> > > > > > > > [ 8562.543830][ C0] ---[ end Kernel panic - not syncing:
> > > > > > > > softlockup: hung tasks ]---
> > > > > > > >
> > > > > > > > When I tested to checkout and build e6df9766894d ("Merge remote-tracking branch
> > > > > > > > 'irqchip/irq/irqchip-next' into master") that was merged into today's
> > > > > > > > tag I was able to
> > > > > > > > boot [2]. When I checked out 25e6e115dd1d ("Merge remote-tracking
> > > > > > > > branch 'rcu/rcu/next' into master") and built and tested that I was
> > > > > > > > able to boot [3] after a
> > > > > > > > looong time. To clarify, the rcu merge comes after the irqchip merge.
> > > > > > > >
> > > > > > > > I also tried to only revert the rcu tree from todays next tag like this:
> > > > > > > > "git diff e6df9766894d..25e6e115dd1d | patch -Rp1". When I built that
> > > > > > > > I was able to
> > > > > > > > boot [4] too.
> > > > > > > >
> > > > > > > > Any idea what's going on here?
> > > > > > >
> > > > > > > Could you please try bisecting the RCU commits?
> > > > > >
> > > > > > I did a bisect and found:
> > > > > > 3c8e1e3eca23 ("rcu: Always set .need_qs from __rcu_read_lock() for strict GPs")
> > > > > >
> > > > > > When I reverted that on next-20200826 and on next-20200827 the
> > > > > > allmodconfig kernel boots [1], there's other issues that I can see in
> > > > > > the log but not this one.
> > > > >
> > > > > Thank you for bisecting!
> > > > >
> > > > > I take it that you have CONFIG_RCU_STRICT_GRACE_PERIOD=y in your .config?
> > > >
> > > > Correct.
> > > >
> > > > > Ah, you do, according to this line in your dmesg:
> > > > >
> > > > > rcu: RCU strict (and thus non-scalable) grace periods enabled.
> > > >
> > > > Yup.
> > > >
> > > > >
> > > > > And much else besides, serious debugging enabled! ;-)
> > > >
> > > > as you can see from the time it takes to boot it is alot =)
> > > >
> > > > >
> > > > > Does this reproduce with CONFIG_RCU_STRICT_GRACE_PERIOD=n?
> > > >
> > > > I trying that now.
> > > >
> > > > > My guess,
> > > > > given the commit that your bisection converged on, is that it will not
> > > > > reproduce in that case.
> > > >
> > > > Your guess was correct, it worked =)
> > >
> > > I cannot reproduce this. I would suggest enabling KASAN, but you have
> > > already enabled it. At this point, I suggest clearing up the other
> > > issues. If this issue remains, please let me know and I will see what
> > > additional diagnostics I can provide.
> >
> > On tag next-20200902 I see this workqueue lockup [1], does that give
> > you any ideas?
> > when I disable CONFIG_RCU_STRICT_GRACE_PERIOD it works.
>
> Does exactly the same commit as you bisected to last time determine
> whether this happens or not?

Yes it's the exact same commit.

Cheers,
Anders

>
> Thanx, Paul
>
> > Cheers,
> > Anders
> > [1] http://ix.io/2w0B
> >
> > >
> > > Thanx, Paul
> > >
> > > > Cheers,
> > > > Anders
> > > >
> > > > >
> > > > > Thanx, Paul
> > > > >
> > > > > > Cheers,
> > > > > > Anders
> > > > > > [1] https://people.linaro.org/~anders.roxell/output-next-20200827-3c8e1e3eca23.log
> > > > > >
> > > > > > > They are linear,
> > > > > > > extending from 0d23eddbe5d4 ("rcu: Remove KCSAN stubs") to 72cc80705122
> > > > > > > ("rcu: Remove unused "cpu" parameter from rcu_report_qs_rdp()".
> > > > > > >
> > > > > > > I do regularly test single-CPU premptible RCU, but not on ARM. Nor do
> > > > > > > I normally enable quite this much debug, so I might have missed something.
> > > > > > >
> > > > > > > Thanx, Paul
> > > > > > >
> > > > > > > > Cheers,
> > > > > > > > Anders
> > > > > > > > [1] https://people.linaro.org/~anders.roxell/output-next-20200826.log
> > > > > > > > [2] https://people.linaro.org/~anders.roxell/output-next-20200826-bisect-e6df9766894d.log
> > > > > > > > [3] https://people.linaro.org/~anders.roxell/output-next-20200826-bisect-25e6e115dd1d.log
> > > > > > > > [4] https://people.linaro.org/~anders.roxell/output-next-20200826-bisect-revert-e6df9766894d-25e6e115dd1d.log

2020-09-10 04:17:14

by Stephen Rothwell

[permalink] [raw]

Subject: Re: linux-next: Tree for Aug 26

Hi all,

On Mon, 7 Sep 2020 10:55:47 +0200 Anders Roxell <[email protected]> wrote:
>
> On Thu, 3 Sep 2020 at 18:14, Paul E. McKenney <[email protected]> wrote:
> >
> > On Thu, Sep 03, 2020 at 10:39:10AM +0200, Anders Roxell wrote:
> > > Hi Paul,
> > >
> > > On Sat, 29 Aug 2020 at 00:59, Paul E. McKenney <[email protected]> wrote:
> > > >
> > > > On Fri, Aug 28, 2020 at 09:24:19PM +0200, Anders Roxell wrote:
> > > > > On Fri, 28 Aug 2020 at 15:29, Paul E. McKenney <[email protected]> wrote:
> > > > > >
> > > > > > On Fri, Aug 28, 2020 at 09:37:17AM +0200, Anders Roxell wrote:
> > > > > > > On Wed, 26 Aug 2020 at 21:39, Paul E. McKenney <[email protected]> wrote:
> > > > > > > >
> > > > > > > > On Wed, Aug 26, 2020 at 08:19:01PM +0200, Anders Roxell wrote:
> > > > > > > > > On Wed, 26 Aug 2020 at 08:33, Stephen Rothwell <[email protected]> wrote:
> > > > > > > >
> > > > > > > > [ . . . ]
> > > > > > > >
> > > > > > > > > I've built and run an arm64 allmodconfig kernel where I use the
> > > > > > > > > defconfig as the base, I do this for testing purposes.
> > > > > > > > > I can see the following call trace [1]:
> > > > > > > > >
> > > > > > > > > [ 2595.811453][ T1] Running tests on all trace events:
> > > > > > > > > [ 2595.860933][ T1] Testing all events:
> > > > > > > > > [ 4316.066072][ T8] kworker/dying (8) used greatest stack depth:
> > > > > > > > > 27056 bytes left
> > > > > > > > > [ 8561.924871][ C0] watchdog: BUG: soft lockup - CPU#0 stuck for
> > > > > > > > > 22s! [migration/0:14]
> > > > > > > > > [ 8561.934498][ C0] Modules linked in:
> > > > > > > > > [ 8561.942303][ C0] irq event stamp: 4044
> > > > > > > > > [ 8561.949044][ C0] hardirqs last enabled at (4043):
> > > > > > > > > [<ffffa000126b530c>] _raw_spin_unlock_irqrestore+0xac/0x138
> > > > > > > > > [ 8561.960848][ C0] hardirqs last disabled at (4044):
> > > > > > > > > [<ffffa000126a89f8>] __schedule+0xf8/0x7e0
> > > > > > > > > [ 8561.971418][ C0] softirqs last enabled at (3698):
> > > > > > > > > [<ffffa00010001b04>] __do_softirq+0x524/0x5f8
> > > > > > > > > [ 8561.982191][ C0] softirqs last disabled at (3689):
> > > > > > > > > [<ffffa000101216c8>] __irq_exit_rcu+0x128/0x1a0
> > > > > > > > > [ 8561.993068][ C0] CPU: 0 PID: 14 Comm: migration/0 Tainted: G
> > > > > > > > > W 5.9.0-rc2-next-20200826-00005-g24628bb4c0bf #1
> > > > > > > > > [ 8562.005684][ C0] Hardware name: linux,dummy-virt (DT)
> > > > > > > > > [ 8562.013247][ C0] pstate: 80400005 (Nzcv daif +PAN -UAO BTYPE=--)
> > > > > > > > > [ 8562.021657][ C0] pc : arch_local_irq_enable+0x58/0x80
> > > > > > > > > [ 8562.029323][ C0] lr : _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > > [ 8562.036739][ C0] sp : ffff0000698efaa0
> > > > > > > > > [ 8562.042984][ C0] x29: ffff0000698efaa0 x28: ffff00006ad0f270
> > > > > > > > > [ 8562.053814][ C0] x27: ffff00006ad0f248 x26: ffff0000698d4718
> > > > > > > > > [ 8562.064687][ C0] x25: ffff00006ad0e798 x24: ffffa000139e3a40
> > > > > > > > > [ 8562.075506][ C0] x23: 0000000000000001 x22: ffffa000154f5000
> > > > > > > > > [ 8562.086425][ C0] x21: ffff00006ad0e798 x20: ffff00006ad0e780
> > > > > > > > > [ 8562.097255][ C0] x19: ffffa000126a905c x18: 00000000000014c0
> > > > > > > > > [ 8562.108071][ C0] x17: 0000000000001500 x16: 0000000000001440
> > > > > > > > > [ 8562.118918][ C0] x15: 00000000f1f1f1f1 x14: 003d090000000000
> > > > > > > > > [ 8562.129739][ C0] x13: 00003d0900000000 x12: ffff80000d31df41
> > > > > > > > > [ 8562.140544][ C0] x11: 1fffe0000d31df40 x10: ffff80000d31df40
> > > > > > > > > [ 8562.151366][ C0] x9 : dfffa00000000000 x8 : ffff0000698efa07
> > > > > > > > > [ 8562.162247][ C0] x7 : 0000000000000001 x6 : 00007ffff2ce20c0
> > > > > > > > > [ 8562.173072][ C0] x5 : ffff0000698d4040 x4 : dfffa00000000000
> > > > > > > > > [ 8562.183954][ C0] x3 : ffffa0001040f904 x2 : 0000000000000007
> > > > > > > > > [ 8562.194811][ C0] x1 : ffffa00014080000 x0 : 00000000000000e0
> > > > > > > > > [ 8562.205858][ C0] Call trace:
> > > > > > > > > [ 8562.211739][ C0] arch_local_irq_enable+0x58/0x80
> > > > > > > > > [ 8562.219076][ C0] _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > > [ 8562.226394][ C0] __schedule+0x75c/0x7e0
> > > > > > > > > [ 8562.233074][ C0] preempt_schedule_notrace+0x64/0xc0
> > > > > > > > > [ 8562.268210][ C0] ftrace_ops_list_func+0x494/0x4e0
> > > > > > > > > [ 8562.275735][ C0] ftrace_graph_call+0x0/0x4
> > > > > > > > > [ 8562.282647][ C0] preempt_count_add+0xc/0x240
> > > > > > > > > [ 8562.289686][ C0] schedule+0xe4/0x160
> > > > > > > > > [ 8562.296187][ C0] smpboot_thread_fn+0x47c/0x540
> > > > > > > > > [ 8562.303377][ C0] kthread+0x23c/0x260
> > > > > > > > > [ 8562.309906][ C0] ret_from_fork+0x10/0x18
> > > > > > > > > [ 8562.316604][ C0] Kernel panic - not syncing: softlockup: hung tasks
> > > > > > > > > [ 8562.325230][ C0] CPU: 0 PID: 14 Comm: migration/0 Tainted: G
> > > > > > > > > W L 5.9.0-rc2-next-20200826-00005-g24628bb4c0bf #1
> > > > > > > > > [ 8562.337861][ C0] Hardware name: linux,dummy-virt (DT)
> > > > > > > > > [ 8562.345374][ C0] Call trace:
> > > > > > > > > [ 8562.351228][ C0] dump_backtrace+0x0/0x320
> > > > > > > > > [ 8562.358070][ C0] show_stack+0x38/0x60
> > > > > > > > > [ 8562.364728][ C0] dump_stack+0x1c0/0x280
> > > > > > > > > [ 8562.371447][ C0] panic+0x32c/0x614
> > > > > > > > > [ 8562.377868][ C0] watchdog_timer_fn+0x49c/0x560
> > > > > > > > > [ 8562.385076][ C0] __run_hrtimer+0x1cc/0x360
> > > > > > > > > [ 8562.392021][ C0] __hrtimer_run_queues+0x1a0/0x220
> > > > > > > > > [ 8562.399500][ C0] hrtimer_interrupt+0x1f8/0x440
> > > > > > > > > [ 8562.406807][ C0] arch_timer_handler_virt+0x68/0xa0
> > > > > > > > > [ 8562.414338][ C0] handle_percpu_devid_irq+0x118/0x2a0
> > > > > > > > > [ 8562.421992][ C0] __handle_domain_irq+0x150/0x1c0
> > > > > > > > > [ 8562.429315][ C0] gic_handle_irq+0x98/0x120
> > > > > > > > > [ 8562.436297][ C0] el1_irq+0xd4/0x1c0
> > > > > > > >
> > > > > > > > We appear to have taken an interrupt here, just after releasing
> > > > > > > > an irq-disabled lock and enabling interrupts.
> > > > > > > >
> > > > > > > > > [ 8562.442748][ C0] arch_local_irq_enable+0x58/0x80
> > > > > > > > > [ 8562.450116][ C0] _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > > [ 8562.457360][ C0] __schedule+0x75c/0x7e0
> > > > > > > > > [ 8562.464142][ C0] preempt_schedule_notrace+0x64/0xc0
> > > > > > > > > [ 8562.471745][ C0] ftrace_ops_list_func+0x494/0x4e0
> > > > > > > > > [ 8562.479195][ C0] ftrace_graph_call+0x0/0x4
> > > > > > > > > [ 8562.486159][ C0] preempt_count_add+0xc/0x240
> > > > > > > > > [ 8562.493210][ C0] schedule+0xe4/0x160
> > > > > > > >
> > > > > > > > We are trying to sleep, so we took a pass through the scheduler and
> > > > > > > > did some tracing.
> > > > > > > >
> > > > > > > > > [ 8562.499737][ C0] smpboot_thread_fn+0x47c/0x540
> > > > > > > >
> > > > > > > > Here we might be bringing up a CPU? Except that according to your
> > > > > > > > dmesg, there is only one CPU. ("RCU restricting CPUs from NR_CPUS=256
> > > > > > > > to nr_cpu_ids=1"). So this seems unlikely.
> > > > > > > >
> > > > > > > > Huh. The first dmesg in output-next-20200826.log is instead a
> > > > > > > > DEBUG_LOCKS_WARN_ON() from lockdep. Might this be related? Or do you
> > > > > > > > also see this warning when boot happens quickly?
> > > > > > > >
> > > > > > > > (I do see the soft lockup later on.)
> > > > > > > >
> > > > > > > > > [ 8562.506960][ C0] kthread+0x23c/0x260
> > > > > > > > > [ 8562.513496][ C0] ret_from_fork+0x10/0x18
> > > > > > > > > [ 8562.521052][ C0] Kernel Offset: disabled
> > > > > > > > > [ 8562.527725][ C0] CPU features: 0x0240002,20002004
> > > > > > > > > [ 8562.534950][ C0] Memory Limit: none
> > > > > > > > > [ 8562.543830][ C0] ---[ end Kernel panic - not syncing:
> > > > > > > > > softlockup: hung tasks ]---
> > > > > > > > >
> > > > > > > > > When I tested to checkout and build e6df9766894d ("Merge remote-tracking branch
> > > > > > > > > 'irqchip/irq/irqchip-next' into master") that was merged into today's
> > > > > > > > > tag I was able to
> > > > > > > > > boot [2]. When I checked out 25e6e115dd1d ("Merge remote-tracking
> > > > > > > > > branch 'rcu/rcu/next' into master") and built and tested that I was
> > > > > > > > > able to boot [3] after a
> > > > > > > > > looong time. To clarify, the rcu merge comes after the irqchip merge.
> > > > > > > > >
> > > > > > > > > I also tried to only revert the rcu tree from todays next tag like this:
> > > > > > > > > "git diff e6df9766894d..25e6e115dd1d | patch -Rp1". When I built that
> > > > > > > > > I was able to
> > > > > > > > > boot [4] too.
> > > > > > > > >
> > > > > > > > > Any idea what's going on here?
> > > > > > > >
> > > > > > > > Could you please try bisecting the RCU commits?
> > > > > > >
> > > > > > > I did a bisect and found:
> > > > > > > 3c8e1e3eca23 ("rcu: Always set .need_qs from __rcu_read_lock() for strict GPs")
> > > > > > >
> > > > > > > When I reverted that on next-20200826 and on next-20200827 the
> > > > > > > allmodconfig kernel boots [1], there's other issues that I can see in
> > > > > > > the log but not this one.
> > > > > >
> > > > > > Thank you for bisecting!
> > > > > >
> > > > > > I take it that you have CONFIG_RCU_STRICT_GRACE_PERIOD=y in your .config?
> > > > >
> > > > > Correct.
> > > > >
> > > > > > Ah, you do, according to this line in your dmesg:
> > > > > >
> > > > > > rcu: RCU strict (and thus non-scalable) grace periods enabled.
> > > > >
> > > > > Yup.
> > > > >
> > > > > >
> > > > > > And much else besides, serious debugging enabled! ;-)
> > > > >
> > > > > as you can see from the time it takes to boot it is alot =)
> > > > >
> > > > > >
> > > > > > Does this reproduce with CONFIG_RCU_STRICT_GRACE_PERIOD=n?
> > > > >
> > > > > I trying that now.
> > > > >
> > > > > > My guess,
> > > > > > given the commit that your bisection converged on, is that it will not
> > > > > > reproduce in that case.
> > > > >
> > > > > Your guess was correct, it worked =)
> > > >
> > > > I cannot reproduce this. I would suggest enabling KASAN, but you have
> > > > already enabled it. At this point, I suggest clearing up the other
> > > > issues. If this issue remains, please let me know and I will see what
> > > > additional diagnostics I can provide.
> > >
> > > On tag next-20200902 I see this workqueue lockup [1], does that give
> > > you any ideas?
> > > when I disable CONFIG_RCU_STRICT_GRACE_PERIOD it works.
> >
> > Does exactly the same commit as you bisected to last time determine
> > whether this happens or not?
>
> Yes it's the exact same commit.

Has this been fixed?

--
Cheers,
Stephen Rothwell

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2020-09-10 05:45:48

by Paul E. McKenney

[permalink] [raw]

Subject: Re: linux-next: Tree for Aug 26

On Thu, Sep 10, 2020 at 02:14:32PM +1000, Stephen Rothwell wrote:
> Hi all,
>
> On Mon, 7 Sep 2020 10:55:47 +0200 Anders Roxell <[email protected]> wrote:
> >
> > On Thu, 3 Sep 2020 at 18:14, Paul E. McKenney <[email protected]> wrote:
> > >
> > > On Thu, Sep 03, 2020 at 10:39:10AM +0200, Anders Roxell wrote:
> > > > Hi Paul,
> > > >
> > > > On Sat, 29 Aug 2020 at 00:59, Paul E. McKenney <[email protected]> wrote:
> > > > >
> > > > > On Fri, Aug 28, 2020 at 09:24:19PM +0200, Anders Roxell wrote:
> > > > > > On Fri, 28 Aug 2020 at 15:29, Paul E. McKenney <[email protected]> wrote:
> > > > > > >
> > > > > > > On Fri, Aug 28, 2020 at 09:37:17AM +0200, Anders Roxell wrote:
> > > > > > > > On Wed, 26 Aug 2020 at 21:39, Paul E. McKenney <[email protected]> wrote:
> > > > > > > > >
> > > > > > > > > On Wed, Aug 26, 2020 at 08:19:01PM +0200, Anders Roxell wrote:
> > > > > > > > > > On Wed, 26 Aug 2020 at 08:33, Stephen Rothwell <[email protected]> wrote:
> > > > > > > > >
> > > > > > > > > [ . . . ]
> > > > > > > > >
> > > > > > > > > > I've built and run an arm64 allmodconfig kernel where I use the
> > > > > > > > > > defconfig as the base, I do this for testing purposes.
> > > > > > > > > > I can see the following call trace [1]:
> > > > > > > > > >
> > > > > > > > > > [ 2595.811453][ T1] Running tests on all trace events:
> > > > > > > > > > [ 2595.860933][ T1] Testing all events:
> > > > > > > > > > [ 4316.066072][ T8] kworker/dying (8) used greatest stack depth:
> > > > > > > > > > 27056 bytes left
> > > > > > > > > > [ 8561.924871][ C0] watchdog: BUG: soft lockup - CPU#0 stuck for
> > > > > > > > > > 22s! [migration/0:14]
> > > > > > > > > > [ 8561.934498][ C0] Modules linked in:
> > > > > > > > > > [ 8561.942303][ C0] irq event stamp: 4044
> > > > > > > > > > [ 8561.949044][ C0] hardirqs last enabled at (4043):
> > > > > > > > > > [<ffffa000126b530c>] _raw_spin_unlock_irqrestore+0xac/0x138
> > > > > > > > > > [ 8561.960848][ C0] hardirqs last disabled at (4044):
> > > > > > > > > > [<ffffa000126a89f8>] __schedule+0xf8/0x7e0
> > > > > > > > > > [ 8561.971418][ C0] softirqs last enabled at (3698):
> > > > > > > > > > [<ffffa00010001b04>] __do_softirq+0x524/0x5f8
> > > > > > > > > > [ 8561.982191][ C0] softirqs last disabled at (3689):
> > > > > > > > > > [<ffffa000101216c8>] __irq_exit_rcu+0x128/0x1a0
> > > > > > > > > > [ 8561.993068][ C0] CPU: 0 PID: 14 Comm: migration/0 Tainted: G
> > > > > > > > > > W 5.9.0-rc2-next-20200826-00005-g24628bb4c0bf #1
> > > > > > > > > > [ 8562.005684][ C0] Hardware name: linux,dummy-virt (DT)
> > > > > > > > > > [ 8562.013247][ C0] pstate: 80400005 (Nzcv daif +PAN -UAO BTYPE=--)
> > > > > > > > > > [ 8562.021657][ C0] pc : arch_local_irq_enable+0x58/0x80
> > > > > > > > > > [ 8562.029323][ C0] lr : _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > > > [ 8562.036739][ C0] sp : ffff0000698efaa0
> > > > > > > > > > [ 8562.042984][ C0] x29: ffff0000698efaa0 x28: ffff00006ad0f270
> > > > > > > > > > [ 8562.053814][ C0] x27: ffff00006ad0f248 x26: ffff0000698d4718
> > > > > > > > > > [ 8562.064687][ C0] x25: ffff00006ad0e798 x24: ffffa000139e3a40
> > > > > > > > > > [ 8562.075506][ C0] x23: 0000000000000001 x22: ffffa000154f5000
> > > > > > > > > > [ 8562.086425][ C0] x21: ffff00006ad0e798 x20: ffff00006ad0e780
> > > > > > > > > > [ 8562.097255][ C0] x19: ffffa000126a905c x18: 00000000000014c0
> > > > > > > > > > [ 8562.108071][ C0] x17: 0000000000001500 x16: 0000000000001440
> > > > > > > > > > [ 8562.118918][ C0] x15: 00000000f1f1f1f1 x14: 003d090000000000
> > > > > > > > > > [ 8562.129739][ C0] x13: 00003d0900000000 x12: ffff80000d31df41
> > > > > > > > > > [ 8562.140544][ C0] x11: 1fffe0000d31df40 x10: ffff80000d31df40
> > > > > > > > > > [ 8562.151366][ C0] x9 : dfffa00000000000 x8 : ffff0000698efa07
> > > > > > > > > > [ 8562.162247][ C0] x7 : 0000000000000001 x6 : 00007ffff2ce20c0
> > > > > > > > > > [ 8562.173072][ C0] x5 : ffff0000698d4040 x4 : dfffa00000000000
> > > > > > > > > > [ 8562.183954][ C0] x3 : ffffa0001040f904 x2 : 0000000000000007
> > > > > > > > > > [ 8562.194811][ C0] x1 : ffffa00014080000 x0 : 00000000000000e0
> > > > > > > > > > [ 8562.205858][ C0] Call trace:
> > > > > > > > > > [ 8562.211739][ C0] arch_local_irq_enable+0x58/0x80
> > > > > > > > > > [ 8562.219076][ C0] _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > > > [ 8562.226394][ C0] __schedule+0x75c/0x7e0
> > > > > > > > > > [ 8562.233074][ C0] preempt_schedule_notrace+0x64/0xc0
> > > > > > > > > > [ 8562.268210][ C0] ftrace_ops_list_func+0x494/0x4e0
> > > > > > > > > > [ 8562.275735][ C0] ftrace_graph_call+0x0/0x4
> > > > > > > > > > [ 8562.282647][ C0] preempt_count_add+0xc/0x240
> > > > > > > > > > [ 8562.289686][ C0] schedule+0xe4/0x160
> > > > > > > > > > [ 8562.296187][ C0] smpboot_thread_fn+0x47c/0x540
> > > > > > > > > > [ 8562.303377][ C0] kthread+0x23c/0x260
> > > > > > > > > > [ 8562.309906][ C0] ret_from_fork+0x10/0x18
> > > > > > > > > > [ 8562.316604][ C0] Kernel panic - not syncing: softlockup: hung tasks
> > > > > > > > > > [ 8562.325230][ C0] CPU: 0 PID: 14 Comm: migration/0 Tainted: G
> > > > > > > > > > W L 5.9.0-rc2-next-20200826-00005-g24628bb4c0bf #1
> > > > > > > > > > [ 8562.337861][ C0] Hardware name: linux,dummy-virt (DT)
> > > > > > > > > > [ 8562.345374][ C0] Call trace:
> > > > > > > > > > [ 8562.351228][ C0] dump_backtrace+0x0/0x320
> > > > > > > > > > [ 8562.358070][ C0] show_stack+0x38/0x60
> > > > > > > > > > [ 8562.364728][ C0] dump_stack+0x1c0/0x280
> > > > > > > > > > [ 8562.371447][ C0] panic+0x32c/0x614
> > > > > > > > > > [ 8562.377868][ C0] watchdog_timer_fn+0x49c/0x560
> > > > > > > > > > [ 8562.385076][ C0] __run_hrtimer+0x1cc/0x360
> > > > > > > > > > [ 8562.392021][ C0] __hrtimer_run_queues+0x1a0/0x220
> > > > > > > > > > [ 8562.399500][ C0] hrtimer_interrupt+0x1f8/0x440
> > > > > > > > > > [ 8562.406807][ C0] arch_timer_handler_virt+0x68/0xa0
> > > > > > > > > > [ 8562.414338][ C0] handle_percpu_devid_irq+0x118/0x2a0
> > > > > > > > > > [ 8562.421992][ C0] __handle_domain_irq+0x150/0x1c0
> > > > > > > > > > [ 8562.429315][ C0] gic_handle_irq+0x98/0x120
> > > > > > > > > > [ 8562.436297][ C0] el1_irq+0xd4/0x1c0
> > > > > > > > >
> > > > > > > > > We appear to have taken an interrupt here, just after releasing
> > > > > > > > > an irq-disabled lock and enabling interrupts.
> > > > > > > > >
> > > > > > > > > > [ 8562.442748][ C0] arch_local_irq_enable+0x58/0x80
> > > > > > > > > > [ 8562.450116][ C0] _raw_spin_unlock_irq+0x84/0xc0
> > > > > > > > > > [ 8562.457360][ C0] __schedule+0x75c/0x7e0
> > > > > > > > > > [ 8562.464142][ C0] preempt_schedule_notrace+0x64/0xc0
> > > > > > > > > > [ 8562.471745][ C0] ftrace_ops_list_func+0x494/0x4e0
> > > > > > > > > > [ 8562.479195][ C0] ftrace_graph_call+0x0/0x4
> > > > > > > > > > [ 8562.486159][ C0] preempt_count_add+0xc/0x240
> > > > > > > > > > [ 8562.493210][ C0] schedule+0xe4/0x160
> > > > > > > > >
> > > > > > > > > We are trying to sleep, so we took a pass through the scheduler and
> > > > > > > > > did some tracing.
> > > > > > > > >
> > > > > > > > > > [ 8562.499737][ C0] smpboot_thread_fn+0x47c/0x540
> > > > > > > > >
> > > > > > > > > Here we might be bringing up a CPU? Except that according to your
> > > > > > > > > dmesg, there is only one CPU. ("RCU restricting CPUs from NR_CPUS=256
> > > > > > > > > to nr_cpu_ids=1"). So this seems unlikely.
> > > > > > > > >
> > > > > > > > > Huh. The first dmesg in output-next-20200826.log is instead a
> > > > > > > > > DEBUG_LOCKS_WARN_ON() from lockdep. Might this be related? Or do you
> > > > > > > > > also see this warning when boot happens quickly?
> > > > > > > > >
> > > > > > > > > (I do see the soft lockup later on.)
> > > > > > > > >
> > > > > > > > > > [ 8562.506960][ C0] kthread+0x23c/0x260
> > > > > > > > > > [ 8562.513496][ C0] ret_from_fork+0x10/0x18
> > > > > > > > > > [ 8562.521052][ C0] Kernel Offset: disabled
> > > > > > > > > > [ 8562.527725][ C0] CPU features: 0x0240002,20002004
> > > > > > > > > > [ 8562.534950][ C0] Memory Limit: none
> > > > > > > > > > [ 8562.543830][ C0] ---[ end Kernel panic - not syncing:
> > > > > > > > > > softlockup: hung tasks ]---
> > > > > > > > > >
> > > > > > > > > > When I tested to checkout and build e6df9766894d ("Merge remote-tracking branch
> > > > > > > > > > 'irqchip/irq/irqchip-next' into master") that was merged into today's
> > > > > > > > > > tag I was able to
> > > > > > > > > > boot [2]. When I checked out 25e6e115dd1d ("Merge remote-tracking
> > > > > > > > > > branch 'rcu/rcu/next' into master") and built and tested that I was
> > > > > > > > > > able to boot [3] after a
> > > > > > > > > > looong time. To clarify, the rcu merge comes after the irqchip merge.
> > > > > > > > > >
> > > > > > > > > > I also tried to only revert the rcu tree from todays next tag like this:
> > > > > > > > > > "git diff e6df9766894d..25e6e115dd1d | patch -Rp1". When I built that
> > > > > > > > > > I was able to
> > > > > > > > > > boot [4] too.
> > > > > > > > > >
> > > > > > > > > > Any idea what's going on here?
> > > > > > > > >
> > > > > > > > > Could you please try bisecting the RCU commits?
> > > > > > > >
> > > > > > > > I did a bisect and found:
> > > > > > > > 3c8e1e3eca23 ("rcu: Always set .need_qs from __rcu_read_lock() for strict GPs")
> > > > > > > >
> > > > > > > > When I reverted that on next-20200826 and on next-20200827 the
> > > > > > > > allmodconfig kernel boots [1], there's other issues that I can see in
> > > > > > > > the log but not this one.
> > > > > > >
> > > > > > > Thank you for bisecting!
> > > > > > >
> > > > > > > I take it that you have CONFIG_RCU_STRICT_GRACE_PERIOD=y in your .config?
> > > > > >
> > > > > > Correct.
> > > > > >
> > > > > > > Ah, you do, according to this line in your dmesg:
> > > > > > >
> > > > > > > rcu: RCU strict (and thus non-scalable) grace periods enabled.
> > > > > >
> > > > > > Yup.
> > > > > >
> > > > > > >
> > > > > > > And much else besides, serious debugging enabled! ;-)
> > > > > >
> > > > > > as you can see from the time it takes to boot it is alot =)
> > > > > >
> > > > > > >
> > > > > > > Does this reproduce with CONFIG_RCU_STRICT_GRACE_PERIOD=n?
> > > > > >
> > > > > > I trying that now.
> > > > > >
> > > > > > > My guess,
> > > > > > > given the commit that your bisection converged on, is that it will not
> > > > > > > reproduce in that case.
> > > > > >
> > > > > > Your guess was correct, it worked =)
> > > > >
> > > > > I cannot reproduce this. I would suggest enabling KASAN, but you have
> > > > > already enabled it. At this point, I suggest clearing up the other
> > > > > issues. If this issue remains, please let me know and I will see what
> > > > > additional diagnostics I can provide.
> > > >
> > > > On tag next-20200902 I see this workqueue lockup [1], does that give
> > > > you any ideas?
> > > > when I disable CONFIG_RCU_STRICT_GRACE_PERIOD it works.
> > >
> > > Does exactly the same commit as you bisected to last time determine
> > > whether this happens or not?
> >
> > Yes it's the exact same commit.
>
> Has this been fixed?

Here is the situation...

Historically, asynchronous RCU grace periods (call_rcu() rather
than the synchronous synchronize_rcu()) have taken some milliseconds
to complete. They still do. I was asked to produce a debugging option
that makes the grace periods much shorter, as in down to 40 microseconds.
This apparently can break things that assume longer call_rcu()-induced
grace periods. (Things like rcupdate.rcu_expedited and single-CPU
operation have trained the code to expect the occasional very short
grace period from synchronize_rcu().)

If you don't want to help debug these problems, then you should always
always always build with CONFIG_RCU_STRICT_GRACE_PERIOD=n. I have not
yet set aside time to go look into this particular issue.

Fair enough?

Thanx, Paul