FYI, we noticed the below changes on
https://github.com/0day-ci/linux Ming-Lei/driver-core-fix-race-between-creating-querying-glue-dir-and-its-cleanup/20160328-163037
commit de6c63b04a9744c00e46986e44e73f391215b58e ("driver core: fix race between creating/querying glue dir and its cleanup")
[ 1.445020] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
[ 1.445788] EDD information not available.
[ 1.446540] Unregister pv shared memory for cpu 0
[ 1.486934] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068
[ 1.488179] IP: [<ffffffff81187c29>] kernfs_find_ns+0xe/0xb2
[ 1.488948] PGD 0
[ 1.489357] Oops: 0000 [#1] SMP
[ 1.499826] Modules linked in:
[ 1.500339] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.5.0-12561-gde6c63b #1
[ 1.501187] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 1.502314] task: ffff880013868000 ti: ffff880013870000 task.ti: ffff880013870000
[ 1.503352] RIP: 0010:[<ffffffff81187c29>] [<ffffffff81187c29>] kernfs_find_ns+0xe/0xb2
[ 1.504460] RSP: 0000:ffff880013873be0 EFLAGS: 00010246
[ 1.505201] RAX: ffff880013868000 RBX: 0000000000000000 RCX: 0000000000001783
[ 1.506074] RDX: 0000000000000000 RSI: ffffffff816cce20 RDI: 0000000000000000
[ 1.507017] RBP: ffff880013873c00 R08: 0000000000016100 R09: ffffffff813a0ebc
[ 1.507945] R10: ffff880014043c00 R11: ffff88001403cb80 R12: ffffffff81a62c00
[ 1.508870] R13: 0000000000000000 R14: 0000000000000003 R15: 000000000000fa40
[ 1.509798] FS: 0000000000000000(0000) GS:ffff880014900000(0000) knlGS:0000000000000000
[ 1.510932] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1.511716] CR2: 0000000000000068 CR3: 0000000001a06000 CR4: 00000000000006a0
[ 1.512621] Stack:
[ 1.513014] 0000000000000000 ffffffff81a62c00 ffff88000bf5e400 0000000000000003
[ 1.514260] ffff880013873c28 ffffffff81187cfd ffffffff816cce20 0000000000000000
[ 1.515483] ffff88000bf5dc10 ffff880013873c48 ffffffff8118ad98 ffff88000bf5dc10
[ 1.516746] Call Trace:
[ 1.517152] [<ffffffff81187cfd>] kernfs_find_and_get_ns+0x30/0x51
[ 1.517970] [<ffffffff8118ad98>] sysfs_unmerge_group+0x18/0x4c
[ 1.518727] [<ffffffff813a2947>] dpm_sysfs_remove+0x1d/0x50
[ 1.519459] [<ffffffff81398a4e>] device_del+0x44/0x1eb
[ 1.520163] [<ffffffff81398c35>] device_unregister+0x40/0x4b
[ 1.520901] [<ffffffff813a0ee4>] cpu_cache_sysfs_exit+0x8f/0xaa
[ 1.521672] [<ffffffff813a13d9>] cacheinfo_cpu_callback+0x57/0x76
[ 1.522457] [<ffffffff810824d1>] notifier_call_chain+0x39/0x5c
[ 1.523228] [<ffffffff81082578>] __raw_notifier_call_chain+0x9/0xb
[ 1.524047] [<ffffffff8106b48e>] __cpu_notify+0x31/0x46
[ 1.524743] [<ffffffff8106b511>] cpu_notify+0xe/0x10
[ 1.525421] [<ffffffff8106ba7c>] cpu_notify_nofail+0x9/0x11
[ 1.526127] [<ffffffff8106bf50>] notify_dead+0x21/0xcb
[ 1.526813] [<ffffffff8106b85e>] cpuhp_invoke_callback+0xb/0x10
[ 1.527617] [<ffffffff8106b898>] cpuhp_down_callbacks+0x35/0x7d
[ 1.528356] [<ffffffff814afea6>] _cpu_down+0x84/0xde
[ 1.529003] [<ffffffff8106c125>] cpu_down+0x27/0x34
[ 1.529674] [<ffffffff810199c3>] _debug_hotplug_cpu+0x4b/0xed
[ 1.530398] [<ffffffff81abca2b>] ? topology_init+0x37/0x37
[ 1.531091] [<ffffffff81abca38>] debug_hotplug_cpu+0xd/0x11
[ 1.531796] [<ffffffff8100041d>] do_one_initcall+0xf2/0x179
[ 1.532507] [<ffffffff81ab5021>] kernel_init_freeable+0x160/0x1e6
[ 1.533289] [<ffffffff814af0ff>] kernel_init+0x9/0xeb
[ 1.533948] [<ffffffff814b74a2>] ret_from_fork+0x22/0x40
[ 1.534629] [<ffffffff814af0f6>] ? rest_init+0x7d/0x7d
[ 1.535284] Code: 08 ff ff ff 45 31 ed e9 ea fe ff ff 48 83 c4 20 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 55 48 89 e5 41 56 41 55 41 54 53 49 89 d5 <66> 8b 47 68 49 89 f4 66 83 e0 20 0f 95 c1 48 85 d2 0f 95 c2 38
[ 1.541369] RIP [<ffffffff81187c29>] kernfs_find_ns+0xe/0xb2
[ 1.542143] RSP <ffff880013873be0>
[ 1.542642] CR2: 0000000000000068
[ 1.543146] ---[ end trace 74e97b9efc0c1870 ]---
[ 1.543756] Kernel panic - not syncing: Fatal exception
FYI, raw QEMU command line is:
qemu-system-x86_64 -enable-kvm -kernel /pkg/linux/x86_64-randconfig-n0-03281713/gcc-5/de6c63b04a9744c00e46986e44e73f391215b58e/vmlinuz-4.5.0-12561-gde6c63b -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-vp-quantal-x86_64-61/bisect_boot-1-quantal-core-x86_64.cgz-x86_64-randconfig-n0-03281713-de6c63b04a9744c00e46986e44e73f391215b58e-20160328-33835-1bmrk7c-0.yaml ARCH=x86_64 kconfig=x86_64-randconfig-n0-03281713 branch=linux-devel/devel-spot-201603281703 commit=de6c63b04a9744c00e46986e44e73f391215b58e BOOT_IMAGE=/pkg/linux/x86_64-randconfig-n0-03281713/gcc-5/de6c63b04a9744c00e46986e44e73f391215b58e/vmlinuz-4.5.0-12561-gde6c63b max_uptime=600 RESULT_ROOT=/result/boot/1/vm-vp-quantal-x86_64/quantal-core-x86_64.cgz/x86_64-randconfig-n0-03281713/gcc-5/de6c63b04a9744c00e46986e44e73f391215b58e/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-vp-quantal-x86_64-61::dhcp drbd.minor_count=8' -initrd /fs/sdc1/initrd-vm-vp-quantal-x86_64-61 -m 360 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-vm-vp-quantal-x86_64-61 -serial file:/dev/shm/kboot/serial-vm-vp-quantal-x86_64-61 -daemonize -display none -monitor null
Thanks,
Kernel Test Robot