[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.563858] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.958848] random: sshd: uninitialized urandom read (32 bytes read) [ 23.385534] random: sshd: uninitialized urandom read (32 bytes read) [ 24.111192] random: sshd: uninitialized urandom read (32 bytes read) [ 449.524678] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.39' (ECDSA) to the list of known hosts. [ 454.924990] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 455.047715] print_req_error: I/O error, dev loop0, sector 7680 executing program [ 455.112513] print_req_error: I/O error, dev loop0, sector 10240 executing program [ 455.176625] print_req_error: I/O error, dev loop0, sector 7680 executing program [ 455.246452] print_req_error: I/O error, dev loop0, sector 12800 [ 615.392116] INFO: task kworker/u4:2:31 blocked for more than 120 seconds. [ 615.399175] Not tainted 4.17.0-rc2+ #20 [ 615.403696] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 615.411685] kworker/u4:2 D12840 31 2 0x80000000 [ 615.417379] Workqueue: writeback wb_workfn (flush-7:0) [ 615.422674] Call Trace: [ 615.425291] __schedule+0x801/0x1e30 [ 615.429034] ? __sched_text_start+0x8/0x8 [ 615.433205] ? mark_held_locks+0xc9/0x160 [ 615.437363] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 615.441970] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 615.447094] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 615.452138] ? trace_hardirqs_on+0xd/0x10 [ 615.456300] ? prepare_to_wait_event+0x37d/0xb90 [ 615.461081] ? unwind_next_frame.part.7+0x1a9/0x9c0 [ 615.466112] ? prepare_to_wait_exclusive+0x530/0x530 [ 615.471250] ? find_held_lock+0x36/0x1c0 [ 615.475321] schedule+0xef/0x430 [ 615.478698] ? __schedule+0x1e30/0x1e30 [ 615.482685] ? __unwind_start+0x166/0x330 [ 615.486854] ? check_same_owner+0x320/0x320 [ 615.491212] ? rcu_is_watching+0x85/0x140 [ 615.495396] ? replenish_dl_entity.cold.52+0x37/0x37 [ 615.500528] ? __might_sleep+0x95/0x190 [ 615.504537] blk_queue_enter+0x8da/0xdf0 [ 615.508617] ? blk_exit_rl+0x80/0x80 [ 615.512350] ? debug_check_no_locks_freed+0x310/0x310 [ 615.517584] ? worker_thread+0x1cc/0x1440 [ 615.521776] ? kthread+0x345/0x410 [ 615.525344] ? ret_from_fork+0x3a/0x50 [ 615.529260] ? print_usage_bug+0xc0/0xc0 [ 615.533338] ? graph_lock+0x170/0x170 [ 615.537165] ? lock_downgrade+0x8e0/0x8e0 [ 615.541326] ? prepare_to_wait+0x4d0/0x4d0 [ 615.545583] ? __lock_is_held+0xb5/0x140 [ 615.549667] generic_make_request+0x144/0x1510 [ 615.554271] ? graph_lock+0x170/0x170 [ 615.558090] ? blk_get_request+0x40/0x40 [ 615.562171] ? mempool_alloc_slab+0x44/0x60 [ 615.566511] ? mempool_free+0x370/0x370 [ 615.570511] ? mempool_alloc_slab+0x44/0x60 [ 615.574842] ? find_held_lock+0x36/0x1c0 [ 615.578938] ? lock_downgrade+0x8e0/0x8e0 [ 615.583113] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 615.588692] ? __disk_get_part+0x202/0x310 [ 615.592947] submit_bio+0xba/0x460 [ 615.596519] ? submit_bio+0xba/0x460 [ 615.600247] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 615.605469] ? generic_make_request+0x1510/0x1510 [ 615.610338] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 615.615384] ? guard_bio_eod+0x2b4/0x600 [ 615.619465] ? wbc_account_io+0x17e/0x2a0 [ 615.623645] submit_bh_wbc+0x5e8/0x7c0 [ 615.627545] __block_write_full_page+0x82e/0xef0 [ 615.632327] ? check_disk_change+0x140/0x140 [ 615.636748] ? __getblk_gfp+0xaf0/0xaf0 [ 615.640749] ? submit_bh_wbc+0x7c0/0x7c0 [ 615.644821] ? __lock_is_held+0xb5/0x140 [ 615.648901] block_write_full_page+0x1ff/0x250 [ 615.653505] ? check_disk_change+0x140/0x140 [ 615.657950] blkdev_writepage+0x24/0x30 [ 615.661943] __writepage+0x69/0xe0 [ 615.665520] write_cache_pages+0x920/0x1690 [ 615.669850] ? tag_pages_for_writeback+0x460/0x460 [ 615.674806] ? clear_page_dirty_for_io+0x1200/0x1200 [ 615.679923] ? __lock_acquire+0x7f5/0x5140 [ 615.684181] ? debug_check_no_locks_freed+0x310/0x310 [ 615.689387] ? __lock_acquire+0x7f5/0x5140 [ 615.693653] ? __update_load_avg_blocked_se.isra.33+0x460/0x460 [ 615.699737] ? print_usage_bug+0xc0/0xc0 [ 615.703831] ? debug_check_no_locks_freed+0x310/0x310 [ 615.709049] ? update_load_avg+0x2d9/0x2570 [ 615.713678] ? print_usage_bug+0xc0/0xc0 [ 615.717763] ? attach_entity_load_avg+0x850/0x850 [ 615.722642] ? blk_start_plug+0xc4/0x360 [ 615.726732] ? blk_lld_busy+0x70/0x70 [ 615.730562] ? graph_lock+0x170/0x170 [ 615.734379] ? save_trace+0xcf/0x290 [ 615.738121] ? debug_check_no_locks_freed+0x310/0x310 [ 615.743339] generic_writepages+0xcc/0x120 [ 615.747602] ? write_cache_pages+0x1690/0x1690 [ 615.752218] blkdev_writepages+0x1d/0x30 [ 615.756306] ? blkdev_readpages+0x40/0x40 [ 615.760472] do_writepages+0x9a/0x1a0 [ 615.764314] __writeback_single_inode+0x1e4/0x15c0 [ 615.769274] ? __mark_inode_dirty+0x1530/0x1530 [ 615.773970] ? debug_check_no_locks_freed+0x310/0x310 [ 615.779181] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 615.784235] ? fprop_reflect_period_percpu.isra.8+0x1d1/0x2f0 [ 615.790159] ? find_held_lock+0x36/0x1c0 [ 615.794238] ? lock_downgrade+0x8e0/0x8e0 [ 615.798410] ? find_held_lock+0x13f/0x1c0 [ 615.802578] ? kasan_check_read+0x11/0x20 [ 615.806767] ? do_raw_spin_unlock+0x9e/0x2e0 [ 615.811206] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 615.815828] ? __lock_is_held+0xb5/0x140 [ 615.819921] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 615.825494] ? wbc_attach_and_unlock_inode+0x643/0x9e0 [ 615.830825] ? __writeback_single_inode+0x15c0/0x15c0 [ 615.836046] ? kasan_check_write+0x14/0x20 [ 615.840305] ? do_raw_spin_lock+0xc1/0x200 [ 615.844557] writeback_sb_inodes+0x6f0/0x11a0 [ 615.849083] ? wbc_detach_inode+0x8e0/0x8e0 [ 615.853420] ? trace_hardirqs_on+0xd/0x10 [ 615.857594] ? down_read_trylock+0xf2/0x1d0 [ 615.861936] ? trylock_super+0x22/0x110 [ 615.865930] ? downgrade_write+0x290/0x290 [ 615.870212] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 615.875789] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 615.881342] __writeback_inodes_wb+0x1b0/0x320 [ 615.885948] ? writeback_sb_inodes+0x11a0/0x11a0 [ 615.890736] ? __lock_is_held+0xb5/0x140 [ 615.894825] wb_writeback+0x9e4/0xf50 [ 615.898654] ? writeback_inodes_wb.constprop.48+0x310/0x310 [ 615.904399] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 615.909441] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 615.914493] ? format_decode+0xae0/0xae0 [ 615.918567] ? wb_update_bandwidth+0x1b0/0x1b0 [ 615.923165] ? graph_lock+0x170/0x170 [ 615.926985] ? string+0x21d/0x2c0 [ 615.930455] ? widen_string+0x2d0/0x2d0 [ 615.934438] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 615.939471] ? find_next_bit+0x104/0x130 [ 615.943551] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 615.948591] ? find_next_bit+0x104/0x130 [ 615.952680] ? cpumask_next+0x24/0x30 [ 615.956509] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 615.961543] ? inode_sleep_on_writeback+0x220/0x220 [ 615.966589] ? trace_hardirqs_on+0xd/0x10 [ 615.970761] ? __local_bh_enable_ip+0x161/0x230 [ 615.975462] wb_workfn+0xd2f/0x1770 [ 615.979115] ? inode_wait_for_writeback+0x40/0x40 [ 615.983985] ? debug_check_no_locks_freed+0x310/0x310 [ 615.989212] ? __lock_is_held+0xb5/0x140 [ 615.993308] ? graph_lock+0x170/0x170 [ 615.997133] ? set_next_entity+0x2ae/0xaf0 [ 616.001396] ? dequeue_entity+0x3f8/0x15c0 [ 616.005660] ? update_load_avg+0x2570/0x2570 [ 616.010105] ? reweight_task+0x130/0x130 [ 616.014193] ? find_held_lock+0x36/0x1c0 [ 616.018299] ? graph_lock+0x170/0x170 [ 616.022126] ? lock_downgrade+0x8e0/0x8e0 [ 616.026309] ? find_held_lock+0x36/0x1c0 [ 616.030396] ? graph_lock+0x170/0x170 [ 616.034221] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 616.039351] ? __lock_is_held+0xb5/0x140 [ 616.043448] process_one_work+0xc1e/0x1b50 [ 616.047712] ? finish_task_switch+0x28b/0x810 [ 616.052238] ? pwq_dec_nr_in_flight+0x490/0x490 [ 616.056930] ? __schedule+0x809/0x1e30 [ 616.060841] ? pick_next_task_fair+0x973/0x1660 [ 616.065534] ? graph_lock+0x170/0x170 [ 616.069362] ? graph_lock+0x170/0x170 [ 616.073188] ? find_held_lock+0x36/0x1c0 [ 616.077279] ? find_held_lock+0x36/0x1c0 [ 616.081366] ? lock_acquire+0x1dc/0x520 [ 616.085366] ? worker_thread+0x41f/0x1440 [ 616.089540] ? lock_downgrade+0x8e0/0x8e0 [ 616.093720] ? lock_release+0xa10/0xa10 [ 616.097732] ? kasan_check_read+0x11/0x20 [ 616.101926] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 616.106537] worker_thread+0x1cc/0x1440 [ 616.110543] ? process_one_work+0x1b50/0x1b50 [ 616.115063] ? graph_lock+0x170/0x170 [ 616.118894] ? find_held_lock+0x36/0x1c0 [ 616.122984] ? find_held_lock+0x36/0x1c0 [ 616.127082] ? __schedule+0x1e30/0x1e30 [ 616.131077] ? do_raw_spin_unlock+0x9e/0x2e0 [ 616.135510] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 616.140114] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 616.145236] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.150267] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 616.155825] ? __kthread_parkme+0x1b7/0x280 [ 616.160160] kthread+0x345/0x410 [ 616.163537] ? process_one_work+0x1b50/0x1b50 [ 616.168043] ? kthread_bind+0x40/0x40 [ 616.171868] ret_from_fork+0x3a/0x50 [ 616.175594] [ 616.175594] Showing all locks held in the system: [ 616.181960] 3 locks held by kworker/u4:2/31: [ 616.186447] #0: (ptrval) ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xaef/0x1b50 [ 616.196041] #1: (ptrval) ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 [ 616.206679] #2: (ptrval) (&type->s_umount_key#35){.+.+}, at: trylock_super+0x22/0x110 [ 616.215481] 2 locks held by khungtaskd/891: [ 616.219816] #0: (ptrval) (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 [ 616.227479] #1: (ptrval) (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a [ 616.236154] 2 locks held by getty/4512: [ 616.240151] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.248439] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.257339] 2 locks held by getty/4513: [ 616.261336] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.269619] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.278518] 2 locks held by getty/4514: [ 616.282511] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.290818] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.299741] 2 locks held by getty/4515: [ 616.303743] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.312046] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.320950] 2 locks held by getty/4516: [ 616.324949] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.333246] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.342145] 2 locks held by getty/4517: [ 616.346147] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.354438] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.363340] 2 locks held by getty/4518: [ 616.367327] #0: (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 [ 616.375624] #1: (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 [ 616.384517] 1 lock held by syz-executor516/4581: [ 616.389305] #0: (ptrval) (&lo->lo_ctl_mutex/1){+.+.}, at: lo_ioctl+0x8d/0x2130 [ 616.397507] [ 616.399150] ============================================= [ 616.399150] [ 616.406195] NMI backtrace for cpu 1 [ 616.409866] CPU: 1 PID: 891 Comm: khungtaskd Not tainted 4.17.0-rc2+ #20 [ 616.416686] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.426022] Call Trace: [ 616.428597] dump_stack+0x1b9/0x294 [ 616.432206] ? dump_stack_print_info.cold.2+0x52/0x52 [ 616.437377] nmi_cpu_backtrace.cold.4+0x19/0xce [ 616.442028] ? lapic_can_unplug_cpu.cold.26+0x3f/0x3f [ 616.447197] nmi_trigger_cpumask_backtrace+0x151/0x192 [ 616.452452] arch_trigger_cpumask_backtrace+0x14/0x20 [ 616.457624] watchdog+0xc10/0xf60 [ 616.461061] ? reset_hung_task_detector+0xb0/0xb0 [ 616.465896] ? __schedule+0x1e30/0x1e30 [ 616.469852] ? do_raw_spin_unlock+0x9e/0x2e0 [ 616.474238] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 616.478799] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 616.483880] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.488876] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 616.494391] ? __kthread_parkme+0x1b7/0x280 [ 616.498694] kthread+0x345/0x410 [ 616.502039] ? reset_hung_task_detector+0xb0/0xb0 [ 616.506870] ? kthread_bind+0x40/0x40 [ 616.510649] ret_from_fork+0x3a/0x50 [ 616.514420] Sending NMI from CPU 1 to CPUs 0: [ 616.518945] NMI backtrace for cpu 0 [ 616.518956] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc2+ #20 [ 616.518959] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.518973] RIP: 0010:irq_exit+0x125/0x200 [ 616.518977] RSP: 0018:ffff8801dae07cd8 EFLAGS: 00000046 [ 616.518983] RAX: dffffc0000000000 RBX: ffff8801d9a9c200 RCX: 0000000000000000 [ 616.518987] RDX: 1ffff1003b353842 RSI: 0000000000000000 RDI: ffff8801d9a9c210 [ 616.518992] RBP: ffff8801dae07ce0 R08: ffffed003b5c46c3 R09: ffffed003b5c46c2 [ 616.518996] R10: ffffed003b5c46c2 R11: ffff8801dae23613 R12: ffff8801dae2c580 [ 616.519000] R13: ffffffff88c75dc0 R14: ffff8801dae07e68 R15: 0000000000000000 [ 616.519005] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 616.519009] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.519013] CR2: ffffffffff600400 CR3: 00000001b5553000 CR4: 00000000001406f0 [ 616.519021] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.519024] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.519026] Call Trace: [ 616.519029] [ 616.519038] scheduler_ipi+0x52b/0xa30 [ 616.519044] ? migration_cpu_stop+0x460/0x460 [ 616.519054] ? rcu_nmi_exit+0x240/0x2b0 [ 616.519060] ? rcu_idle_enter+0x460/0x460 [ 616.519069] ? kvm_clock_read+0x25/0x30 [ 616.519075] ? kvm_sched_clock_read+0x9/0x20 [ 616.519081] ? sched_clock+0x31/0x40 [ 616.519088] ? sched_clock_cpu+0x1b/0x180 [ 616.519095] ? rcu_pm_notify+0xc0/0xc0 [ 616.519102] ? rcu_irq_exit+0xd8/0x110 [ 616.519110] smp_reschedule_interrupt+0xed/0x660 [ 616.519117] ? smp_thermal_interrupt+0x800/0x800 [ 616.519123] ? kvm_clock_read+0x25/0x30 [ 616.519129] ? kvm_sched_clock_read+0x9/0x20 [ 616.519134] ? sched_clock+0x31/0x40 [ 616.519140] ? sched_clock_cpu+0x1b/0x180 [ 616.519151] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 616.519158] reschedule_interrupt+0xf/0x20 [ 616.519159] [ 616.519167] RIP: 0010:native_safe_halt+0x6/0x10 [ 616.519170] RSP: 0018:ffffffff88c07bc0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 [ 616.519176] RAX: dffffc0000000000 RBX: 1ffffffff1180f7b RCX: 0000000000000000 [ 616.519180] RDX: 1ffffffff11a3160 RSI: 0000000000000001 RDI: ffffffff88d18b00 [ 616.519184] RBP: ffffffff88c07bc0 R08: ffffed003b5c46c3 R09: 0000000000000000 [ 616.519187] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 616.519191] R13: ffffffff88c07c78 R14: ffffffff897bf060 R15: 0000000000000000 [ 616.519200] default_idle+0xc2/0x440 [ 616.519206] ? __sched_text_end+0x3/0x3 [ 616.519213] ? rcu_idle_enter+0x304/0x460 [ 616.519220] ? rcu_eqs_special_set+0x190/0x190 [ 616.519227] ? tsc_verify_tsc_adjust+0xf7/0x360 [ 616.519234] ? mark_tsc_async_resets+0x20/0x20 [ 616.519240] ? tick_nohz_idle_enter+0x219/0x320 [ 616.519247] arch_cpu_idle+0x10/0x20 [ 616.519254] default_idle_call+0x6d/0x90 [ 616.519260] do_idle+0x395/0x560 [ 616.519267] ? arch_cpu_idle_exit+0x70/0x70 [ 616.519273] ? __schedule+0x1e30/0x1e30 [ 616.519281] cpu_startup_entry+0x104/0x120 [ 616.519287] ? cpu_in_idle+0x20/0x20 [ 616.519294] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.519300] ? trace_hardirqs_on+0xd/0x10 [ 616.519306] rest_init+0xe1/0xe4 [ 616.519314] start_kernel+0x906/0x92d [ 616.519320] ? mem_encrypt_init+0xb/0xb [ 616.519326] ? early_idt_handler_common+0x3b/0x60 [ 616.519335] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 616.519340] ? x86_family+0x3e/0x50 [ 616.519347] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 616.519354] x86_64_start_reservations+0x29/0x2b [ 616.519360] x86_64_start_kernel+0x76/0x79 [ 616.519367] secondary_startup_64+0xa5/0xb0 [ 616.519370] Code: 00 01 5b 5d c3 65 48 8b 1d 89 a4 ba 7e 48 85 db 74 2c 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 10 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 c2 00 00 00 48 8b 43 10 48 85 c0 0f 84 31 ff ff ff 48 c7 [ 616.519945] Kernel panic - not syncing: hung_task: blocked tasks [ 616.885957] CPU: 1 PID: 891 Comm: khungtaskd Not tainted 4.17.0-rc2+ #20 [ 616.892785] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.902115] Call Trace: [ 616.904694] dump_stack+0x1b9/0x294 [ 616.908302] ? dump_stack_print_info.cold.2+0x52/0x52 [ 616.913474] ? printk_safe_log_store+0x260/0x260 [ 616.918212] panic+0x22f/0x4de [ 616.921384] ? add_taint.cold.5+0x16/0x16 [ 616.925513] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 616.931030] ? nmi_trigger_cpumask_backtrace+0x13a/0x192 [ 616.936458] ? printk_safe_flush+0xd7/0x130 [ 616.941195] watchdog+0xc21/0xf60 [ 616.944636] ? reset_hung_task_detector+0xb0/0xb0 [ 616.949463] ? __schedule+0x1e30/0x1e30 [ 616.953415] ? do_raw_spin_unlock+0x9e/0x2e0 [ 616.957803] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 616.962365] ? _raw_spin_unlock_irqrestore+0x74/0xc0 [ 616.967447] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 616.972442] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 616.977959] ? __kthread_parkme+0x1b7/0x280 [ 616.982260] kthread+0x345/0x410 [ 616.985621] ? reset_hung_task_detector+0xb0/0xb0 [ 616.990440] ? kthread_bind+0x40/0x40 [ 616.994220] ret_from_fork+0x3a/0x50 [ 616.998452] Dumping ftrace buffer: [ 617.002254] (ftrace buffer empty) [ 617.005944] Kernel Offset: disabled [ 617.009553] Rebooting in 86400 seconds..