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: [] 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:[] [] 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] [] kernfs_find_and_get_ns+0x30/0x51 [ 1.517970] [] sysfs_unmerge_group+0x18/0x4c [ 1.518727] [] dpm_sysfs_remove+0x1d/0x50 [ 1.519459] [] device_del+0x44/0x1eb [ 1.520163] [] device_unregister+0x40/0x4b [ 1.520901] [] cpu_cache_sysfs_exit+0x8f/0xaa [ 1.521672] [] cacheinfo_cpu_callback+0x57/0x76 [ 1.522457] [] notifier_call_chain+0x39/0x5c [ 1.523228] [] __raw_notifier_call_chain+0x9/0xb [ 1.524047] [] __cpu_notify+0x31/0x46 [ 1.524743] [] cpu_notify+0xe/0x10 [ 1.525421] [] cpu_notify_nofail+0x9/0x11 [ 1.526127] [] notify_dead+0x21/0xcb [ 1.526813] [] cpuhp_invoke_callback+0xb/0x10 [ 1.527617] [] cpuhp_down_callbacks+0x35/0x7d [ 1.528356] [] _cpu_down+0x84/0xde [ 1.529003] [] cpu_down+0x27/0x34 [ 1.529674] [] _debug_hotplug_cpu+0x4b/0xed [ 1.530398] [] ? topology_init+0x37/0x37 [ 1.531091] [] debug_hotplug_cpu+0xd/0x11 [ 1.531796] [] do_one_initcall+0xf2/0x179 [ 1.532507] [] kernel_init_freeable+0x160/0x1e6 [ 1.533289] [] kernel_init+0x9/0xeb [ 1.533948] [] ret_from_fork+0x22/0x40 [ 1.534629] [] ? 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 [] kernfs_find_ns+0xe/0xb2 [ 1.542143] RSP [ 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