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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Mon, 2 Mar 2020 11:08:30 +0530
Message-ID: <CA+G9fYtYqEbH9AUtVr744BKxLq0s1YuD=_kT9Ej=85dteHME4Q@mail.gmail.com>
Subject: Re: [GIT PULL] Second batch of KVM changes for Linux 5.6-rc4 (or rc5)
To:     Paolo Bonzini <pbonzini@redhat.com>, kvm list <kvm@vger.kernel.org>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        open list <linux-kernel@vger.kernel.org>,
        lkft-triage@lists.linaro.org,
        Anders Roxell <anders.roxell@linaro.org>, oupton@google.com,
        jmattson@google.com
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Mon, 2 Mar 2020 at 00:33, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> Linus,
>
> The following changes since commit a93236fcbe1d0248461b29c0f87cb0b510c94e6f:
>
>   KVM: s390: rstify new ioctls in api.rst (2020-02-24 19:28:40 +0100)
>
> are available in the git repository at:
>
>   https://git.kernel.org/pub/scm/virt/kvm/kvm.git tags/for-linus
>
> for you to fetch changes up to 86f7e90ce840aa1db407d3ea6e9b3a52b2ce923c:
>
>   KVM: VMX: check descriptor table exits on instruction emulation (2020-03-01 19:26:31 +0100)
>
> ----------------------------------------------------------------
> More bugfixes, including a few remaining "make W=1" issues such
> as too large frame sizes on some configurations.  On the
> ARM side, the compiler was messing up shadow stacks between
> EL1 and EL2 code, which is easily fixed with __always_inline.
>
> ----------------------------------------------------------------
> Christian Borntraeger (1):
>       KVM: let declaration of kvm_get_running_vcpus match implementation
>
> Erwan Velu (1):
>       kvm: x86: Limit the number of "kvm: disabled by bios" messages
>
> James Morse (3):
>       KVM: arm64: Ask the compiler to __always_inline functions used at HYP
>       KVM: arm64: Define our own swab32() to avoid a uapi static inline
>       arm64: Ask the compiler to __always_inline functions used by KVM at HYP
>
> Jeremy Cline (1):
>       KVM: arm/arm64: Fix up includes for trace.h
>
> Mark Rutland (1):
>       kvm: arm/arm64: Fold VHE entry/exit work into kvm_vcpu_run_vhe()
>
> Oliver Upton (1):
>       KVM: VMX: check descriptor table exits on instruction emulation
>
> Paolo Bonzini (4):
>       KVM: SVM: allocate AVIC data structures based on kvm_amd module parameter
>       KVM: allow disabling -Werror
>       KVM: x86: avoid useless copy of cpufreq policy
>       Merge tag 'kvmarm-fixes-5.6-1' of git://git.kernel.org/.../kvmarm/kvmarm into HEAD
>
> Valdis Kletnieks (1):
>       KVM: x86: allow compiling as non-module with W=1
>
> Wanpeng Li (2):
>       KVM: Introduce pv check helpers
>       KVM: Pre-allocate 1 cpumask variable per cpu for both pv tlb and pv ipis

Kernel panic noticed on latest Linux mainline kernel.
qemu_x86_64 boot failed due to kernel panic.
Please investigate this problem.

Meanwhile we will also investigate by using git bisect to identify bad patch.

/usr/bin/qemu-system-x86_64 -cpu host -enable-kvm -nographic \
 -net nic,model=virtio,macaddr=DE:AD:BE:EF:66:05 -net tap \
-m 1024 -monitor none -kernel
bzImage--5.5+git0+98d54f81e3-r0-intel-corei7-64-20200301225337-2502.bin
\
--append "root=/dev/sda  rootwait console=ttyS0,115200" \
 -hda rpb-console-image-lkft-intel-corei7-64-20200301225337-2502.rootfs.ext4 \
 -m 4096 -smp 4 -nographic \
 -drive format=qcow2,file=lava-guest.qcow2,media=disk,if=virtio,id=lavatest

[    0.000000] Linux version 5.6.0-rc4 (oe-user@oe-host) (gcc version
7.3.0 (GCC)) #1 SMP Sun Mar 1 22:59:08 UTC 2020
<trim>
[    0.762542] kvm: no hardware support
[    0.763123] BUG: kernel NULL pointer dereference, address: 000000000000028c
[    0.763425] #PF: supervisor read access in kernel mode
[    0.763425] #PF: error_code(0x0000) - not-present page
[    0.763425] PGD 0 P4D 0
[    0.763425] Oops: 0000 [#1] SMP NOPTI
[    0.763425] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0-rc4 #1
[    0.763425] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-1 04/01/2014
[    0.763425] RIP: 0010:kobject_put+0x12/0x1c0
[    0.763425] Code: 4a 01 89 d0 f0 0f b1 0f 75 ef 89 d1 eb d9 66 2e
0f 1f 84 00 00 00 00 00 48 85 ff 0f 84 bd 00 00 00 55 48 89 e5 41 55
41 54 53 <f6> 47 3c 01 48 89 fb 74 22 48 8d 7b 38 b8 ff ff ff ff f0 0f
c1 43
[    0.763425] RSP: 0018:ffffbd2800013de8 EFLAGS: 00010206
[    0.763425] RAX: 0000000000000000 RBX: ffffffff996e9660 RCX: 0000000000000000
[    0.763425] RDX: 0000000000000046 RSI: 0000000000000006 RDI: 0000000000000250
[    0.763425] RBP: ffffbd2800013e00 R08: 0000000000000000 R09: 0000000000000000
[    0.763425] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[    0.763425] R13: 0000000000003ad0 R14: 0000000000000000 R15: ffffffff99a896be
[    0.763425] FS:  0000000000000000(0000) GS:ffff92ec7bc00000(0000)
knlGS:0000000000000000
[    0.763425] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.763425] CR2: 000000000000028c CR3: 0000000049c10000 CR4: 00000000003406f0
[    0.763425] Call Trace:
[    0.763425]  cpufreq_cpu_put+0x15/0x20
[    0.763425]  kvm_arch_init+0x1f6/0x2b0
[    0.763425]  kvm_init+0x31/0x290
[    0.763425]  ? svm_check_processor_compat+0xd/0xd
[    0.763425]  ? svm_check_processor_compat+0xd/0xd
[    0.763425]  svm_init+0x21/0x23
[    0.763425]  do_one_initcall+0x61/0x2f0
[    0.763425]  ? rdinit_setup+0x30/0x30
[    0.763425]  ? rcu_read_lock_sched_held+0x4f/0x80
[    0.763425]  kernel_init_freeable+0x219/0x279
[    0.763425]  ? rest_init+0x250/0x250
[    0.763425]  kernel_init+0xe/0x110
[    0.763425]  ret_from_fork+0x27/0x50
[    0.763425] Modules linked in:
[    0.763425] CR2: 000000000000028c
[    0.763425] ---[ end trace 239abf40c55c409b ]---
[    0.763425] RIP: 0010:kobject_put+0x12/0x1c0
[    0.763425] Code: 4a 01 89 d0 f0 0f b1 0f 75 ef 89 d1 eb d9 66 2e
0f 1f 84 00 00 00 00 00 48 85 ff 0f 84 bd 00 00 00 55 48 89 e5 41 55
41 54 53 <f6> 47 3c 01 48 89 fb 74 22 48 8d 7b 38 b8 ff ff ff ff f0 0f
c1 43
[    0.763425] RSP: 0018:ffffbd2800013de8 EFLAGS: 00010206
[    0.763425] RAX: 0000000000000000 RBX: ffffffff996e9660 RCX: 0000000000000000
[    0.763425] RDX: 0000000000000046 RSI: 0000000000000006 RDI: 0000000000000250
[    0.763425] RBP: ffffbd2800013e00 R08: 0000000000000000 R09: 0000000000000000
[    0.763425] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[    0.763425] R13: 0000000000003ad0 R14: 0000000000000000 R15: ffffffff99a896be
[    0.763425] FS:  0000000000000000(0000) GS:ffff92ec7bc00000(0000)
knlGS:0000000000000000
[    0.763425] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    0.763425] CR2: 000000000000028c CR3: 0000000049c10000 CR4: 00000000003406f0
[    0.763425] BUG: sleeping function called from invalid context at
/usr/src/kernel/include/linux/percpu-rwsem.h:38
[    0.763425] in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid:
1, name: swapper/0
[    0.763425] INFO: lockdep is turned off.
[    0.763425] irq event stamp: 696816
[    0.763425] hardirqs last  enabled at (696815):
[<ffffffff98c929d1>] _raw_read_unlock_irqrestore+0x31/0x50
[    0.763425] hardirqs last disabled at (696816):
[<ffffffff97e01f3b>] trace_hardirqs_off_thunk+0x1a/0x1c
[    0.763425] softirqs last  enabled at (696776):
[<ffffffff99000338>] __do_softirq+0x338/0x43a
[    0.763425] softirqs last disabled at (696769):
[<ffffffff97f045e8>] irq_exit+0xb8/0xc0
[    0.763425] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G      D
  5.6.0-rc4 #1
[    0.763425] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.12.0-1 04/01/2014
[    0.763425] Call Trace:
[    0.763425]  dump_stack+0x7a/0xa5
[    0.763425]  ___might_sleep+0x163/0x250
[    0.763425]  __might_sleep+0x4a/0x80
[    0.763425]  exit_signals+0x33/0x2d0
[    0.763425]  do_exit+0xb6/0xcf0
[    0.763425]  ? kernel_init_freeable+0x219/0x279
[    0.763425]  ? rest_init+0x250/0x250
[    0.763425]  rewind_stack_do_exit+0x17/0x20
[    0.763425] Kernel panic - not syncing: Attempted to kill init!
exitcode=0x00000009


metadata:
  git branch: master
  git repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
  git describe: v5.6-rc4
  kernel-config:
http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-mainline/2502/config

git log --online
98d54f81e36b (HEAD -> master, tag: v5.6-rc4, origin/master,
origin/HEAD) Linux 5.6-rc4
e70869821a46 Merge tag 'ext4_for_linus_stable' of
git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
f853ed90e2e4 Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
86f7e90ce840 KVM: VMX: check descriptor table exits on instruction emulation
fb279f4e2386 Merge branch 'i2c/for-current-fixed' of
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
37b0b6b8b99c ext4: potential crash on allocation error in
ext4_alloc_flex_bg_array()
38b17afb0ebb macintosh: therm_windtunnel: fix regression when
instantiating devices
6c5d91124929 jbd2: fix data races at struct journal_head
7557c1b3f715 Merge tag 'scsi-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi


ref:
https://lkft.validation.linaro.org/scheduler/job/1261774#L461
https://lkft.validation.linaro.org/scheduler/job/1261816#L477

-- 
Linaro LKFT
https://lkft.linaro.org