[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.43' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 483.069162] block nbd0: shutting down sockets [ 483.078983] print_req_error: I/O error, dev nbd0, sector 0 [ 483.084823] Buffer I/O error on dev nbd0, logical block 0, async page read [ 483.091946] print_req_error: I/O error, dev nbd0, sector 2 [ 483.098103] Buffer I/O error on dev nbd0, logical block 1, async page read [ 483.105111] Buffer I/O error on dev nbd0, logical block 2, async page read [ 483.112317] Buffer I/O error on dev nbd0, logical block 3, async page read [ 483.119787] print_req_error: I/O error, dev nbd0, sector 0 [ 483.125434] Buffer I/O error on dev nbd0, logical block 0, async page read [ 483.132571] print_req_error: I/O error, dev nbd0, sector 2 [ 483.138290] Buffer I/O error on dev nbd0, logical block 1, async page read [ 483.145304] Buffer I/O error on dev nbd0, logical block 2, async page read [ 483.152371] Buffer I/O error on dev nbd0, logical block 3, async page read [ 483.159539] print_req_error: I/O error, dev nbd0, sector 0 [ 483.165325] Buffer I/O error on dev nbd0, logical block 0, async page read [ 483.172439] print_req_error: I/O error, dev nbd0, sector 2 [ 483.178104] Buffer I/O error on dev nbd0, logical block 1, async page read [ 483.185290] print_req_error: I/O error, dev nbd0, sector 0 [ 483.191062] print_req_error: I/O error, dev nbd0, sector 2 [ 483.196824] print_req_error: I/O error, dev nbd0, sector 0 [ 483.196909] print_req_error: I/O error, dev nbd0, sector 2 [ 483.208977] ldm_validate_partition_table(): Disk read failed. executing program [ 483.215877] Dev nbd0: unable to read RDB block 0 [ 483.221596] nbd0: unable to read partition table [ 483.229335] ldm_validate_partition_table(): Disk read failed. [ 483.236165] Dev nbd0: unable to read RDB block 0 [ 483.242646] nbd0: unable to read partition table [ 483.249849] ldm_validate_partition_table(): Disk read failed. [ 483.256613] Dev nbd0: unable to read RDB block 0 [ 483.262786] nbd0: unable to read partition table [ 483.272967] ldm_validate_partition_table(): Disk read failed. [ 483.279861] Dev nbd0: unable to read RDB block 0 [ 483.285399] nbd0: unable to read partition table [ 717.626659] INFO: task syz-executor768:8108 blocked for more than 140 seconds. [ 717.634146] Not tainted 4.19.186-syzkaller #0 [ 717.640429] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.648472] syz-executor768 D26224 8108 8093 0x00000004 [ 717.654106] Call Trace: [ 717.656743] __schedule+0x887/0x2040 [ 717.660463] ? io_schedule_timeout+0x140/0x140 [ 717.665170] ? prepare_to_wait_exclusive+0x2d0/0x2d0 [ 717.670350] schedule+0x8d/0x1b0 [ 717.673718] blk_mq_freeze_queue_wait+0x119/0x270 [ 717.678595] ? blk_mq_poll_stats_fn+0x210/0x210 [ 717.683268] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.688402] ? wait_woken+0x250/0x250 [ 717.692319] ? blk_freeze_queue_start+0x124/0x200 [ 717.697195] nbd_add_socket+0x168/0x840 [ 717.701168] ? cap_capable+0x1eb/0x250 [ 717.705035] ? nbd_put+0x50/0x50 [ 717.708429] ? security_capable+0x8f/0xc0 [ 717.712579] nbd_ioctl+0x584/0xbe0 [ 717.716103] ? drop_futex_key_refs+0x6f/0xe0 [ 717.720539] ? nbd_disconnect_and_put+0x190/0x190 [ 717.725385] ? __lock_acquire+0x6de/0x3ff0 [ 717.729661] ? nbd_disconnect_and_put+0x190/0x190 [ 717.734509] blkdev_ioctl+0x5cb/0x1a80 [ 717.738421] ? blkpg_ioctl+0x9d0/0x9d0 [ 717.742319] ? do_futex+0x163/0x18a0 [ 717.746026] ? mark_held_locks+0xf0/0xf0 [ 717.750277] ? percpu_counter_add_batch+0x126/0x180 [ 717.755426] ? alloc_empty_file+0xd7/0x170 [ 717.759715] ? futex_exit_release+0x220/0x220 [ 717.764209] block_ioctl+0xe9/0x130 [ 717.767879] ? blkdev_fallocate+0x3f0/0x3f0 [ 717.772218] do_vfs_ioctl+0xcdb/0x12e0 [ 717.776087] ? lock_downgrade+0x720/0x720 [ 717.780281] ? check_preemption_disabled+0x41/0x280 [ 717.785300] ? ioctl_preallocate+0x200/0x200 [ 717.789738] ? __fget+0x356/0x510 [ 717.793189] ? do_dup2+0x450/0x450 [ 717.796781] ? __se_sys_futex+0x298/0x3b0 [ 717.800935] ksys_ioctl+0x9b/0xc0 [ 717.804374] __x64_sys_ioctl+0x6f/0xb0 [ 717.808289] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.812873] do_syscall_64+0xf9/0x620 [ 717.816725] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.821911] RIP: 0033:0x44a169 [ 717.825091] Code: Bad RIP value. [ 717.828493] RSP: 002b:00007ffb9c045308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 717.836202] RAX: ffffffffffffffda RBX: 00000000004cb508 RCX: 000000000044a169 [ 717.843499] RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000003 [ 717.850837] RBP: 00000000004cb500 R08: 0000000000000000 R09: 0000000000000000 [ 717.858141] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004cb50c [ 717.865406] R13: 000000000049b08c R14: 64626e2f7665642f R15: 0000000000022000 [ 717.872734] INFO: task syz-executor768:8109 blocked for more than 140 seconds. [ 717.880132] Not tainted 4.19.186-syzkaller #0 [ 717.885256] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.893356] syz-executor768 D27368 8109 8093 0x00000004 [ 717.899028] Call Trace: [ 717.901612] __schedule+0x887/0x2040 [ 717.905325] ? io_schedule_timeout+0x140/0x140 [ 717.909951] ? prepare_to_wait_exclusive+0x2d0/0x2d0 [ 717.915054] schedule+0x8d/0x1b0 [ 717.918451] blk_queue_enter+0x66f/0xb70 [ 717.922515] ? blk_exit_rl+0x70/0x70 [ 717.926229] ? __lock_acquire+0x6de/0x3ff0 [ 717.930510] ? wait_woken+0x250/0x250 [ 717.934313] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 717.939360] ? kmem_cache_alloc+0x315/0x370 [ 717.943682] generic_make_request+0x3fe/0xdf0 [ 717.948597] ? blk_put_request+0x110/0x110 [ 717.952844] ? check_preemption_disabled+0x41/0x280 [ 717.957906] ? alloc_buffer_head+0x20/0x130 [ 717.962229] submit_bio+0xb1/0x430 [ 717.965755] ? generic_make_request+0xdf0/0xdf0 [ 717.970449] ? check_preemption_disabled+0x41/0x280 [ 717.975483] ? guard_bio_eod+0x2a0/0x650 [ 717.979585] submit_bh_wbc+0x5a7/0x760 [ 717.983474] block_read_full_page+0x7cf/0xd10 [ 717.987995] ? block_llseek+0xc0/0xc0 [ 717.991844] ? __bread_gfp+0x300/0x300 [ 717.995727] ? add_to_page_cache_locked+0x40/0x40 [ 718.000610] do_read_cache_page+0x533/0x1170 [ 718.005014] ? blkdev_writepages+0x20/0x20 [ 718.009285] read_dev_sector+0xbf/0x500 [ 718.013258] ? adfspart_check_ADFS+0x8e0/0x8e0 [ 718.017883] adfspart_check_ICS+0x114/0xe70 [ 718.022205] ? adfspart_check_ADFS+0x8e0/0x8e0 [ 718.026862] ? snprintf+0xbb/0xf0 [ 718.030309] ? vsprintf+0x30/0x30 [ 718.033743] ? _raw_spin_unlock+0x29/0x40 [ 718.037933] ? __get_vm_area_node+0x2e2/0x3a0 [ 718.042434] ? adfspart_check_ADFS+0x8e0/0x8e0 [ 718.047051] check_partition+0x390/0x690 [ 718.051116] rescan_partitions+0x1b5/0x970 [ 718.055338] ? nbd_open+0x4cc/0x6f0 [ 718.058999] ? nbd_add_socket+0x840/0x840 [ 718.063148] bdev_disk_changed+0x179/0x1b0 [ 718.067413] __blkdev_get+0x1282/0x1480 [ 718.071389] ? bdev_disk_changed+0x1b0/0x1b0 [ 718.075798] ? mark_held_locks+0xf0/0xf0 [ 718.079887] ? mark_held_locks+0xf0/0xf0 [ 718.084007] blkdev_get+0xb0/0x940 [ 718.087577] ? bd_acquire+0x245/0x440 [ 718.091375] ? __blkdev_get+0x1480/0x1480 [ 718.095533] ? lock_downgrade+0x720/0x720 [ 718.099717] ? lock_acquire+0x170/0x3c0 [ 718.103688] ? bd_acquire+0x21/0x440 [ 718.107446] ? do_raw_spin_unlock+0x171/0x230 [ 718.111938] blkdev_open+0x202/0x290 [ 718.115636] do_dentry_open+0x4aa/0x1160 [ 718.119723] ? blkdev_get_by_dev+0x70/0x70 [ 718.123956] ? chown_common+0x550/0x550 [ 718.127960] ? inode_permission+0x3d/0x140 [ 718.132195] path_openat+0x793/0x2df0 [ 718.135982] ? path_lookupat+0x8d0/0x8d0 [ 718.140066] ? do_anonymous_page+0x704/0x1be0 [ 718.144558] ? mark_held_locks+0xf0/0xf0 [ 718.148655] do_filp_open+0x18c/0x3f0 [ 718.152454] ? may_open_dev+0xf0/0xf0 [ 718.156241] ? lock_downgrade+0x720/0x720 [ 718.160412] ? lock_acquire+0x170/0x3c0 [ 718.164382] ? __alloc_fd+0x34/0x570 [ 718.168136] ? do_raw_spin_unlock+0x171/0x230 [ 718.172629] ? _raw_spin_unlock+0x29/0x40 [ 718.176849] ? __alloc_fd+0x28d/0x570 [ 718.180656] do_sys_open+0x3b3/0x520 [ 718.184349] ? filp_open+0x70/0x70 [ 718.187916] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.193287] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.198338] ? do_syscall_64+0x21/0x620 [ 718.202310] do_syscall_64+0xf9/0x620 [ 718.206372] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.211586] RIP: 0033:0x406994 [ 718.214784] Code: Bad RIP value. [ 718.218190] RSP: 002b:00007ffb9c023e60 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 [ 718.225890] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406994 [ 718.233187] RDX: 0000000000000000 RSI: 00007ffb9c023ef0 RDI: 00000000ffffff9c [ 718.240495] RBP: 00007ffb9c023ef0 R08: 0000000000000000 R09: 002364626e2f7665 [ 718.247803] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 [ 718.255091] R13: 000000000049b08c R14: 64626e2f7665642f R15: 0000000000022000 [ 718.262412] INFO: task syz-executor768:8110 blocked for more than 140 seconds. [ 718.269832] Not tainted 4.19.186-syzkaller #0 [ 718.274837] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 718.282825] syz-executor768 D29160 8110 8093 0x00000004 [ 718.288496] Call Trace: [ 718.291080] __schedule+0x887/0x2040 [ 718.294781] ? io_schedule_timeout+0x140/0x140 [ 718.299403] ? lock_downgrade+0x720/0x720 [ 718.303553] ? __mutex_lock+0x458/0x1260 [ 718.307645] schedule+0x8d/0x1b0 [ 718.311014] schedule_preempt_disabled+0xf/0x20 [ 718.315664] __mutex_lock+0x647/0x1260 [ 718.319597] ? unwind_get_return_address+0x51/0x90 [ 718.324526] ? __blkdev_get+0x1d0/0x1480 [ 718.328614] ? __mutex_add_waiter+0x160/0x160 [ 718.339058] ? lock_downgrade+0x720/0x720 [ 718.343287] ? lock_acquire+0x170/0x3c0 [ 718.347288] ? get_gendisk+0x83/0x380 [ 718.351090] ? disk_block_events+0x1d/0x130 [ 718.355390] __blkdev_get+0x1d0/0x1480 [ 718.359318] ? bdev_disk_changed+0x1b0/0x1b0 [ 718.363722] ? mark_held_locks+0xf0/0xf0 [ 718.367822] ? mark_held_locks+0xf0/0xf0 [ 718.371899] blkdev_get+0xb0/0x940 [ 718.375437] ? bd_acquire+0x245/0x440 [ 718.379302] ? __blkdev_get+0x1480/0x1480 [ 718.383445] ? lock_downgrade+0x720/0x720 [ 718.387624] ? lock_acquire+0x170/0x3c0 [ 718.391609] ? bd_acquire+0x21/0x440 [ 718.395306] ? do_raw_spin_unlock+0x171/0x230 [ 718.399848] blkdev_open+0x202/0x290 [ 718.403560] do_dentry_open+0x4aa/0x1160 [ 718.407648] ? blkdev_get_by_dev+0x70/0x70 [ 718.411905] ? chown_common+0x550/0x550 [ 718.415859] ? inode_permission+0x3d/0x140 [ 718.420129] path_openat+0x793/0x2df0 [ 718.423931] ? path_lookupat+0x8d0/0x8d0 [ 718.428028] ? do_anonymous_page+0x704/0x1be0 [ 718.432519] ? mark_held_locks+0xf0/0xf0 [ 718.436616] do_filp_open+0x18c/0x3f0 [ 718.440415] ? may_open_dev+0xf0/0xf0 [ 718.444201] ? lock_downgrade+0x720/0x720 [ 718.448384] ? lock_acquire+0x170/0x3c0 [ 718.452357] ? __alloc_fd+0x34/0x570 [ 718.456051] ? do_raw_spin_unlock+0x171/0x230 [ 718.460568] ? _raw_spin_unlock+0x29/0x40 [ 718.464708] ? __alloc_fd+0x28d/0x570 [ 718.468600] do_sys_open+0x3b3/0x520 [ 718.472330] ? filp_open+0x70/0x70 [ 718.476059] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.481458] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.486537] ? do_syscall_64+0x21/0x620 [ 718.490501] do_syscall_64+0xf9/0x620 [ 718.494284] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.499490] RIP: 0033:0x406994 [ 718.502680] Code: Bad RIP value. [ 718.506026] RSP: 002b:00007ffb9c002e60 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 [ 718.513775] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000406994 [ 718.521085] RDX: 0000000000000000 RSI: 00007ffb9c002ef0 RDI: 00000000ffffff9c [ 718.528394] RBP: 00007ffb9c002ef0 R08: 0000000000000000 R09: 002364626e2f7665 [ 718.535658] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 [ 718.542952] R13: 000000000049b08c R14: 64626e2f7665642f R15: 0000000000022000 [ 718.550293] [ 718.550293] Showing all locks held in the system: [ 718.556855] 2 locks held by ksoftirqd/0/9: [ 718.561080] #0: 00000000fc2bc6d0 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 [ 718.568676] #1: 00000000540244f2 (rcu_read_lock){....}, at: update_curr+0x2c3/0x870 [ 718.576641] 1 lock held by khungtaskd/1570: [ 718.580968] #0: 00000000540244f2 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.589708] 2 locks held by in:imklog/7818: [ 718.594028] #0: 00000000e9934136 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.602054] #1: 00000000852217bc (fs_reclaim){+.+.}, at: __might_fault+0xef/0x1d0 [ 718.609833] 1 lock held by systemd-udevd/8102: [ 718.614402] #0: 00000000bbbf09e9 (&bdev->bd_mutex){+.+.}, at: blkdev_put+0x30/0x520 [ 718.622325] 1 lock held by syz-executor768/8108: [ 718.627106] #0: 00000000af39b74a (&nbd->config_lock){+.+.}, at: nbd_ioctl+0x151/0xbe0 [ 718.635166] 1 lock held by syz-executor768/8109: [ 718.639935] #0: 00000000bbbf09e9 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 [ 718.648233] 1 lock held by syz-executor768/8110: [ 718.652981] #0: 00000000bbbf09e9 (&bdev->bd_mutex){+.+.}, at: __blkdev_get+0x1d0/0x1480 [ 718.661241] [ 718.662877] ============================================= [ 718.662877] [ 718.669949] NMI backtrace for cpu 1 [ 718.674612] CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.186-syzkaller #0 [ 718.682037] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.691370] Call Trace: [ 718.693937] dump_stack+0x1fc/0x2ef [ 718.697549] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.702030] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.706510] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.711772] watchdog+0x991/0xe60 [ 718.715217] ? reset_hung_task_detector+0x30/0x30 [ 718.720053] kthread+0x33f/0x460 [ 718.723398] ? kthread_park+0x180/0x180 [ 718.727353] ret_from_fork+0x24/0x30 [ 718.731102] Sending NMI from CPU 1 to CPUs 0: [ 718.736238] NMI backtrace for cpu 0 [ 718.736244] CPU: 0 PID: 4678 Comm: systemd-journal Not tainted 4.19.186-syzkaller #0 [ 718.736250] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.736253] RIP: 0010:write_comp_data+0x23/0x70 [ 718.736263] Code: 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 80 df 01 00 65 8b 05 ea 80 9f 7e a9 00 01 1f 00 75 4f 8b 86 60 13 00 00 <83> f8 03 75 44 48 8b 86 68 13 00 00 8b b6 64 13 00 00 48 8b 38 48 [ 718.736266] RSP: 0018:ffff8880a1987910 EFLAGS: 00000246 [ 718.736273] RAX: 0000000000000000 RBX: 0000000000000023 RCX: ffffffff87ed607e [ 718.736278] RDX: 0000000000000023 RSI: ffff8880a1978200 RDI: 0000000000000007 [ 718.736282] RBP: ffff8880ae3d31c0 R08: 0000000000000000 R09: 000000000000003f [ 718.736287] R10: 0000000000000007 R11: 0000000000000000 R12: ffff8880ae3d30a8 [ 718.736291] R13: 0000000000000006 R14: 0000000000000000 R15: ffff8880ae3d3080 [ 718.736296] FS: 00007ff6d2f0f8c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 718.736300] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.736304] CR2: 00007ff6d02f7000 CR3: 00000000a1876000 CR4: 00000000001406f0 [ 718.736309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.736313] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.736316] Call Trace: [ 718.736319] radix_tree_next_chunk+0x30e/0xaa0 [ 718.736322] find_get_entries+0x5cc/0xa90 [ 718.736325] ? filemap_fault+0x2180/0x2180 [ 718.736328] ? mark_held_locks+0xa6/0xf0 [ 718.736332] ? ___bpf_prog_run+0xc64/0x50b0 [ 718.736335] ? __lock_acquire+0x6de/0x3ff0 [ 718.736338] shmem_undo_range+0x1b7/0x1f30 [ 718.736341] ? shmem_enabled_show+0x230/0x230 [ 718.736344] ? __lock_acquire+0x6de/0x3ff0 [ 718.736347] ? current_time+0x6f/0x1c0 [ 718.736350] ? mark_held_locks+0xa6/0xf0 [ 718.736354] ? ktime_get_coarse_real_ts64+0x1c7/0x290 [ 718.736357] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 718.736361] ? ktime_get_coarse_real_ts64+0x1a1/0x290 [ 718.736364] ? inode_newsize_ok+0x121/0x1e0 [ 718.736367] ? setattr_prepare+0x135/0x7e0 [ 718.736370] shmem_setattr+0x80a/0xc90 [ 718.736373] ? shmem_fallocate+0xd80/0xd80 [ 718.736376] notify_change+0x70b/0xfc0 [ 718.736379] do_truncate+0x134/0x1f0 [ 718.736382] ? dentry_open+0x1d0/0x1d0 [ 718.736386] ? apparmor_path_truncate+0x183/0x200 [ 718.736389] do_sys_ftruncate+0x492/0x560 [ 718.736392] do_syscall_64+0xf9/0x620 [ 718.736395] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.736398] RIP: 0033:0x7ff6d21d1ec7 [ 718.736408] Code: 73 01 c3 48 8b 0d d1 5f 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 4d 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 5f 2b 00 f7 d8 64 89 01 48 [ 718.736411] RSP: 002b:00007ffee60129f8 EFLAGS: 00000202 ORIG_RAX: 000000000000004d [ 718.736424] RAX: ffffffffffffffda RBX: 00007ffee6012a30 RCX: 00007ff6d21d1ec7 [ 718.736429] RDX: 000055bba1b4be80 RSI: 0000000000800000 RDI: 0000000000000010 [ 718.736434] RBP: 00007ffee6012a28 R08: 0000000000000008 R09: 000055bba1b4c25c [ 718.736438] R10: 000055bba1b4c1e0 R11: 0000000000000202 R12: 000055bba1b4c1e0 [ 718.736443] R13: 00007ffee6012b28 R14: 000055bba1a20958 R15: 0005bfab888accbd [ 718.736603] Kernel panic - not syncing: hung_task: blocked tasks [ 719.040225] CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.186-syzkaller #0 [ 719.047649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 719.056980] Call Trace: [ 719.059550] dump_stack+0x1fc/0x2ef [ 719.063159] panic+0x26a/0x50e [ 719.066331] ? __warn_printk+0xf3/0xf3 [ 719.070196] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 719.075278] ? cpumask_next+0x3c/0x40 [ 719.079072] ? printk_safe_flush+0xd6/0x120 [ 719.083378] ? watchdog+0x991/0xe60 [ 719.086988] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 719.092416] watchdog+0x9a2/0xe60 [ 719.095877] ? reset_hung_task_detector+0x30/0x30 [ 719.100704] kthread+0x33f/0x460 [ 719.104074] ? kthread_park+0x180/0x180 [ 719.108033] ret_from_fork+0x24/0x30 [ 719.112503] Kernel Offset: disabled [ 719.116123] Rebooting in 86400 seconds..