FYI, we noticed the following commit (built with gcc-7): commit: b415391a5f396d877cf8e01f71c1f6cdd918f916 ("xfs: move the log ioend workqueue to struct xlog") git://git.infradead.org/users/hch/xfs xfs-log-item-cleanup in testcase: xfstests with following parameters: disk: 4HDD fs: xfs test: generic-group8 test-description: xfstests is a regression test suite for xfs and other files ystems. test-url: git://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 2G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------------+------------+------------+ | | 9e1cd78798 | b415391a5f | +-------------------------------------------------------+------------+------------+ | boot_successes | 0 | 0 | | boot_failures | 1 | 22 | | BUG:kernel_reboot-without-warning_in_test_stage | 1 | 8 | | BUG:kernel_NULL_pointer_dereference,address | 0 | 9 | | Oops:#[##] | 0 | 9 | | RIP:_raw_spin_lock | 0 | 7 | | RIP:native_safe_halt | 0 | 12 | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 11 | | WARNING:at_kernel/workqueue.c:#__queue_work | 0 | 1 | | RIP:__queue_work | 0 | 5 | | BUG:kernel_hang_in_test_stage | 0 | 1 | | general_protection_fault:#[##] | 0 | 2 | | BUG:soft_lockup-CPU##stuck_for#s | 0 | 1 | | RIP:smp_call_function_single | 0 | 1 | | Kernel_panic-not_syncing:softlockup:hung_tasks | 0 | 1 | +-------------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <lkp(a)intel.com&gt; [ 499.892181] BUG: kernel NULL pointer dereference, address: 0000000000000238 [ 499.895048] #PF: supervisor read access in kernel mode [ 499.897136] #PF: error_code(0x0000) - not-present page [ 499.899376] PGD 0 P4D 0 [ 499.900918] Oops: 0000 [#1] SMP PTI [ 499.902810] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.2.0-rc3-00017-gb415391 #1 [ 499.905457] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 499.908295] RIP: 0010:__queue_work+0x1b9/0x420 [ 499.910178] Code: 00 48 63 04 02 83 f8 ff 0f 84 a6 01 00 00 48 8d 84 c5 10 01 00 00 4c 89 f7 4c 8b 38 e8 10 e6 ff ff 48 85 c0 0f 85 d4 fe ff ff <49> 8b 07 e9 d5 fe ff ff 65 8b 05 48 23 b5 60 89 c0 48 0f a3 05 4e [ 499.917358] RSP: 0018:ffffb45ac03bce10 EFLAGS: 00010046 [ 499.919928] RAX: 0000000000000000 RBX: ffffffffa07a2a60 RCX: 0000000000000000 [ 499.923024] RDX: 0000000000027848 RSI: 000000007fffffff RDI: ffff970d600dd6f0 [ 499.926188] RBP: ffff970d60037a00 R08: 0000000000000000 R09: 0000000000000000 [ 499.929455] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 499.932690] R13: 0000000000002000 R14: ffff970d600dd6f0 R15: 0000000000000238 [ 499.935262] FS: 0000000000000000(0000) GS:ffff970dab100000(0000) knlGS:0000000000000000 [ 499.938064] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 499.940345] CR2: 0000000000000238 CR3: 000000007e192000 CR4: 00000000000006e0 [ 499.942847] Call Trace: [ 499.945839] <IRQ> [ 499.947187] queue_work_on+0x34/0x40 [ 499.948860] blk_update_request+0x78/0x300 [ 499.950765] blk_mq_end_request+0x1a/0x120 [ 499.952548] blk_flush_complete_seq+0xe5/0x350 [ 499.954405] ? scsi_io_completion+0x85/0x4f0 [ 499.956230] flush_end_io+0x122/0x1b0 [ 499.957925] blk_done_softirq+0xa1/0xd0 [ 499.959741] __do_softirq+0xe3/0x311 [ 499.961398] irq_exit+0xdd/0xf0 [ 499.962948] call_function_single_interrupt+0xf/0x20 [ 499.964901] </IRQ> [ 499.966206] RIP: 0010:native_safe_halt+0xe/0x10 [ 499.968035] Code: eb bd 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d 86 de 5a 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 76 de 5a 00 fb f4 <c3> 90 66 66 66 66 90 41 55 41 54 55 53 e8 00 05 6c ff 65 8b 2d 49 [ 499.974334] RSP: 0018:ffffb45ac0387eb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04 [ 499.977047] RAX: ffffffff9fe5c1a0 RBX: 0000000000000001 RCX: 0000000000000001 [ 499.979882] RDX: 0000000000000001 RSI: 0000000000000087 RDI: 0000000000000001 [ 499.982476] RBP: 0000000000000001 R08: 0000007c19195a48 R09: 0000007433f1918c [ 499.984974] R10: 0000000000000000 R11: 00000000000f4240 R12: 0000000000000000 [ 499.987550] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 499.990261] ? __sched_text_end+0x7/0x7 [ 499.992114] default_idle+0x1c/0x160 [ 499.993811] do_idle+0x1c4/0x280 [ 499.995383] cpu_startup_entry+0x19/0x20 [ 499.997119] start_secondary+0x184/0x1d0 [ 499.998858] secondary_startup_64+0xb6/0xc0 [ 500.000648] Modules linked in: xfs libcrc32c dm_mod sr_mod cdrom sg crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ata_generic pata_acpi ppdev bochs_drm ttm drm_kms_helper snd_pcm syscopyarea sysfillrect sysimgblt fb_sys_fops snd_timer drm ata_piix snd aesni_intel crypto_simd libata cryptd glue_helper soundcore joydev pcspkr parport_pc serio_raw parport floppy i2c_piix4 ip_tables [ 500.015042] CR2: 0000000000000238 [ 500.017320] ---[ end trace bbfbad79f0ae8527 ]--- To reproduce: # build kernel cd linux cp config-5.2.0-rc3-00017-gb415391 .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email Thanks, lkp