[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.88' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 36.554068] FAULT_INJECTION: forcing a failure. [ 36.554068] name failslab, interval 1, probability 0, space 0, times 1 [ 36.565540] CPU: 1 PID: 8107 Comm: syz-executor526 Not tainted 4.19.211-syzkaller #0 [ 36.573423] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.582761] Call Trace: [ 36.585351] dump_stack+0x1fc/0x2ef [ 36.588972] should_fail.cold+0xa/0xf [ 36.592768] ? setup_fault_attr+0x200/0x200 [ 36.597068] ? should_fail+0x142/0x7b0 [ 36.600940] __should_failslab+0x115/0x180 [ 36.605158] should_failslab+0x5/0x10 [ 36.608940] kmem_cache_alloc_node_trace+0x244/0x3b0 [ 36.614024] __kmalloc_node+0x38/0x70 [ 36.617806] blk_alloc_flush_queue+0x120/0x300 [ 36.622378] blk_mq_realloc_hw_ctxs+0x7bc/0x1000 [ 36.627130] blk_mq_update_nr_hw_queues+0x557/0xb50 [ 36.632127] ? workqueue_sysfs_register+0x391/0x3e0 [ 36.637125] ? blk_mq_init_queue+0xa0/0xa0 [ 36.641341] ? apparmor_sb_mount+0x970/0x970 [ 36.645792] nbd_start_device+0x1f2/0xd60 [ 36.649928] ? security_capable+0x8f/0xc0 [ 36.654078] nbd_ioctl+0x62c/0xbe0 [ 36.657601] ? _copy_from_user+0xd2/0x130 [ 36.661727] ? nbd_disconnect_and_put+0x190/0x190 [ 36.666559] ? get_pid_task+0xcd/0x190 [ 36.670436] ? check_preemption_disabled+0x41/0x280 [ 36.675435] ? lock_downgrade+0x720/0x720 [ 36.679565] ? nbd_disconnect_and_put+0x190/0x190 [ 36.684398] blkdev_ioctl+0x5cb/0x1a80 [ 36.688404] ? blkpg_ioctl+0x9d0/0x9d0 [ 36.692296] ? get_pid_task+0xf4/0x190 [ 36.696187] ? proc_fail_nth_write+0x95/0x1d0 [ 36.700660] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 36.705568] ? mark_held_locks+0xf0/0xf0 [ 36.709613] block_ioctl+0xe9/0x130 [ 36.713220] ? blkdev_fallocate+0x3f0/0x3f0 [ 36.717520] do_vfs_ioctl+0xcdb/0x12e0 [ 36.721389] ? vfs_write+0x3d7/0x540 [ 36.725081] ? ioctl_preallocate+0x200/0x200 [ 36.729476] ? lock_downgrade+0x720/0x720 [ 36.733607] ? check_preemption_disabled+0x41/0x280 [ 36.738616] ? vfs_write+0x393/0x540 [ 36.742320] ? ksys_write+0x1c8/0x2a0 [ 36.746103] ksys_ioctl+0x9b/0xc0 [ 36.749547] __x64_sys_ioctl+0x6f/0xb0 [ 36.753418] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 36.757980] do_syscall_64+0xf9/0x620 [ 36.761766] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.766939] RIP: 0033:0x7f068763c4c9 [ 36.770647] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 36.789537] RSP: 002b:00007ffed5975bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 36.797226] RAX: ffffffffffffffda RBX: 00007ffed5975e38 RCX: 00007f068763c4c9 [ 36.804473] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 [ 36.811730] RBP: 0000000000000002 R08: 0000000000000002 R09: 0000000000000000 [ 36.818985] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffed5975c10 [ 36.826341] R13: 0000000000000004 R14: 00007ffed5975c70 R15: 0000000000000000 [ 36.843975] BUG: unable to handle kernel NULL pointer dereference at 0000000000000118 [ 36.851976] PGD aae9c067 P4D aae9c067 PUD aafbc067 PMD 0 [ 36.857518] Oops: 0002 [#1] PREEMPT SMP KASAN [ 36.862014] CPU: 0 PID: 8107 Comm: syz-executor526 Not tainted 4.19.211-syzkaller #0 [ 36.869871] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.879231] RIP: 0010:blk_mq_map_swqueue+0x287/0xa20 [ 36.884326] Code: c1 ea 03 80 3c 1a 00 0f 85 cf 06 00 00 89 ee bf 07 00 00 00 4d 8b 3f e8 47 04 fd fd 83 fd 07 0f 87 04 05 00 00 e8 c9 02 fd fd 4d 0f ab b7 18 01 00 00 49 8d bf 74 01 00 00 48 89 fa 48 c1 ea [ 36.903206] RSP: 0018:ffff8880938cf920 EFLAGS: 00010293 [ 36.908562] RAX: ffff888096e6c1c0 RBX: dffffc0000000000 RCX: ffffffff83658299 [ 36.915826] RDX: 0000000000000000 RSI: ffffffff836582a7 RDI: 0000000000000005 [ 36.923072] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 [ 36.930319] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aeaed080 [ 36.937588] R13: ffffe8ffffd37f80 R14: 0000000000000001 R15: 0000000000000000 [ 36.944846] FS: 000055555617a3c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 36.953052] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.958935] CR2: 0000000000000118 CR3: 00000000aa99b000 CR4: 00000000003406f0 [ 36.966188] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.973435] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.980701] Call Trace: [ 36.983279] blk_mq_update_nr_hw_queues+0x5bb/0xb50 [ 36.988279] ? workqueue_sysfs_register+0x391/0x3e0 [ 36.993280] ? blk_mq_init_queue+0xa0/0xa0 [ 36.997492] ? apparmor_sb_mount+0x970/0x970 [ 37.001889] nbd_start_device+0x1f2/0xd60 [ 37.006020] ? security_capable+0x8f/0xc0 [ 37.010147] nbd_ioctl+0x62c/0xbe0 [ 37.013668] ? _copy_from_user+0xd2/0x130 [ 37.017809] ? nbd_disconnect_and_put+0x190/0x190 [ 37.022650] ? get_pid_task+0xcd/0x190 [ 37.026707] ? check_preemption_disabled+0x41/0x280 [ 37.031720] ? lock_downgrade+0x720/0x720 [ 37.035855] ? nbd_disconnect_and_put+0x190/0x190 [ 37.040682] blkdev_ioctl+0x5cb/0x1a80 [ 37.044552] ? blkpg_ioctl+0x9d0/0x9d0 [ 37.048419] ? get_pid_task+0xf4/0x190 [ 37.052288] ? proc_fail_nth_write+0x95/0x1d0 [ 37.056767] ? proc_tgid_io_accounting+0x7f0/0x7f0 [ 37.061677] ? mark_held_locks+0xf0/0xf0 [ 37.065725] block_ioctl+0xe9/0x130 [ 37.069434] ? blkdev_fallocate+0x3f0/0x3f0 [ 37.073739] do_vfs_ioctl+0xcdb/0x12e0 [ 37.077606] ? vfs_write+0x3d7/0x540 [ 37.081297] ? ioctl_preallocate+0x200/0x200 [ 37.085687] ? lock_downgrade+0x720/0x720 [ 37.089817] ? check_preemption_disabled+0x41/0x280 [ 37.094813] ? vfs_write+0x393/0x540 [ 37.098506] ? ksys_write+0x1c8/0x2a0 [ 37.102325] ksys_ioctl+0x9b/0xc0 [ 37.105766] __x64_sys_ioctl+0x6f/0xb0 [ 37.109636] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.114227] do_syscall_64+0xf9/0x620 [ 37.118023] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.123197] RIP: 0033:0x7f068763c4c9 [ 37.126891] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 37.145788] RSP: 002b:00007ffed5975bf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 37.153478] RAX: ffffffffffffffda RBX: 00007ffed5975e38 RCX: 00007f068763c4c9 [ 37.160725] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 [ 37.167976] RBP: 0000000000000002 R08: 0000000000000002 R09: 0000000000000000 [ 37.175242] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffed5975c10 [ 37.182493] R13: 0000000000000004 R14: 00007ffed5975c70 R15: 0000000000000000 [ 37.189747] Modules linked in: [ 37.192919] CR2: 0000000000000118 [ 37.196363] ---[ end trace fd8860ee63804caf ]--- [ 37.201108] RIP: 0010:blk_mq_map_swqueue+0x287/0xa20 [ 37.206190] Code: c1 ea 03 80 3c 1a 00 0f 85 cf 06 00 00 89 ee bf 07 00 00 00 4d 8b 3f e8 47 04 fd fd 83 fd 07 0f 87 04 05 00 00 e8 c9 02 fd fd 4d 0f ab b7 18 01 00 00 49 8d bf 74 01 00 00 48 89 fa 48 c1 ea [ 37.225069] RSP: 0018:ffff8880938cf920 EFLAGS: 00010293 [ 37.230436] RAX: ffff888096e6c1c0 RBX: dffffc0000000000 RCX: ffffffff83658299 [ 37.237690] RDX: 0000000000000000 RSI: ffffffff836582a7 RDI: 0000000000000005 [ 37.244944] RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000007 [ 37.252196] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880aeaed080 [ 37.259583] R13: ffffe8ffffd37f80 R14: 0000000000000001 R15: 0000000000000000 [ 37.266864] FS: 000055555617a3c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 37.275071] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.280937] CR2: 0000000000000118 CR3: 00000000aa99b000 CR4: 00000000003406f0 [ 37.288199] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.295459] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.302710] Kernel panic - not syncing: Fatal exception [ 37.308222] Kernel Offset: disabled [ 37.311829] Rebooting in 86400 seconds..