[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 27.859461] kauditd_printk_skb: 7 callbacks suppressed [ 27.859472] audit: type=1800 audit(1540407533.329:29): pid=5235 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.887032] audit: type=1800 audit(1540407533.329:30): pid=5235 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 678.989873] INFO: task kworker/u4:0:7 blocked for more than 140 seconds. [ 678.997016] Not tainted 4.19.0+ #301 [ 679.001768] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 679.010044] kworker/u4:0 D13168 7 2 0x80000000 [ 679.015860] Workqueue: writeback wb_workfn (flush-8:0) [ 679.027103] Call Trace: [ 679.031029] __schedule+0x8cf/0x21d0 [ 679.034785] ? __switch_to_asm+0x34/0x70 [ 679.038853] ? __switch_to_asm+0x40/0x70 [ 679.043304] ? __switch_to_asm+0x34/0x70 [ 679.047420] ? __sched_text_start+0x8/0x8 [ 679.051929] ? __schedule+0x8d7/0x21d0 [ 679.055874] ? zap_class+0x640/0x640 [ 679.059601] ? print_usage_bug+0xc0/0xc0 [ 679.064029] ? __sched_text_start+0x8/0x8 [ 679.068270] ? kasan_check_read+0x11/0x20 [ 679.072814] schedule+0xfe/0x460 [ 679.076202] ? __schedule+0x21d0/0x21d0 [ 679.080559] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 679.085429] ? trace_hardirqs_on+0xbd/0x310 [ 679.090212] ? kasan_check_read+0x11/0x20 [ 679.094388] ? trace_hardirqs_off_caller+0x310/0x310 [ 679.099525] ? preempt_schedule+0x4d/0x60 [ 679.104054] __rwsem_down_write_failed_common+0xc9a/0x15e0 [ 679.110114] ? rwsem_spin_on_owner+0xa30/0xa30 [ 679.114754] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 679.121038] ? ret_from_fork+0x3a/0x50 [ 679.124942] ? __lock_acquire+0x62f/0x4c20 [ 679.129196] ? mark_held_locks+0x130/0x130 [ 679.133831] ? perf_trace_sched_process_exec+0x860/0x860 [ 679.139297] ? zap_class+0x640/0x640 [ 679.143373] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 679.148940] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 679.154848] ? lru_add_drain_cpu+0x1c0/0x500 [ 679.159279] ? __pagevec_release+0x88/0x120 [ 679.164852] ? find_held_lock+0x36/0x1c0 [ 679.168935] ? zap_class+0x640/0x640 [ 679.173069] ? zap_class+0x640/0x640 [ 679.176806] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 679.182712] ? check_preemption_disabled+0x48/0x280 [ 679.187767] ? lock_acquire+0x1ed/0x520 [ 679.192125] ? ext4_map_blocks+0x88f/0x1b40 [ 679.196472] ? lock_release+0xa00/0xa00 [ 679.200871] ? perf_trace_sched_process_exec+0x860/0x860 [ 679.206479] rwsem_down_write_failed+0xe/0x10 [ 679.211296] ? rwsem_down_write_failed+0xe/0x10 [ 679.215986] call_rwsem_down_write_failed+0x17/0x30 [ 679.221410] down_write+0xa5/0x130 [ 679.224969] ? ext4_map_blocks+0x88f/0x1b40 [ 679.229294] ? down_read+0x120/0x120 [ 679.233374] ext4_map_blocks+0x88f/0x1b40 [ 679.237554] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 679.243492] ? check_preemption_disabled+0x48/0x280 [ 679.248587] ? ext4_issue_zeroout+0x190/0x190 [ 679.253464] ? __lock_is_held+0xb5/0x140 [ 679.257571] ext4_writepages+0x2595/0x4130 [ 679.262243] ? ext4_mark_inode_dirty+0xb30/0xb30 [ 679.267018] ? find_held_lock+0x36/0x1c0 [ 679.271546] ? hctx_unlock+0xde/0x150 [ 679.275379] ? kasan_check_read+0x11/0x20 [ 679.279630] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 679.285315] ? rcu_softirq_qs+0x20/0x20 [ 679.289310] ? print_usage_bug+0xc0/0xc0 [ 679.294713] ? __lock_acquire+0x62f/0x4c20 [ 679.298963] ? hctx_unlock+0x10a/0x150 [ 679.303190] ? print_usage_bug+0xc0/0xc0 [ 679.307282] ? __blk_mq_run_hw_queue+0x1c6/0x2e0 [ 679.312419] ? hctx_unlock+0x150/0x150 [ 679.316334] ? mark_held_locks+0x130/0x130 [ 679.320978] ? __blk_mq_delay_run_hw_queue+0x32f/0x5b0 [ 679.326274] ? zap_class+0x640/0x640 [ 679.330309] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 679.335865] ? check_preemption_disabled+0x48/0x280 [ 679.341410] ? ext4_mark_inode_dirty+0xb30/0xb30 [ 679.346191] do_writepages+0x9a/0x1a0 [ 679.350310] ? ext4_mark_inode_dirty+0xb30/0xb30 [ 679.355082] ? do_writepages+0x9a/0x1a0 [ 679.359076] __writeback_single_inode+0x20a/0x1620 [ 679.364485] ? __lock_acquire+0x62f/0x4c20 [ 679.368744] ? __mark_inode_dirty+0x1510/0x1510 [ 679.373754] ? mark_held_locks+0x130/0x130 [ 679.378019] ? find_held_lock+0x36/0x1c0 [ 679.382444] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 679.387742] ? lock_downgrade+0x900/0x900 [ 679.392248] ? find_held_lock+0x13f/0x1c0 [ 679.396430] ? kasan_check_read+0x11/0x20 [ 679.400982] ? do_raw_spin_unlock+0xa7/0x330 [ 679.405417] ? do_raw_spin_trylock+0x270/0x270 [ 679.410549] ? __lock_is_held+0xb5/0x140 [ 679.414643] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 679.421495] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 679.426812] ? __writeback_single_inode+0x1620/0x1620 [ 679.432335] writeback_sb_inodes+0x71f/0x11d0 [ 679.436864] ? wbc_detach_inode+0x940/0x940 [ 679.441520] ? lock_release+0xa00/0xa00 [ 679.445595] ? down_read_trylock+0xda/0x140 [ 679.450338] ? trylock_super+0x22/0x110 [ 679.454341] ? downgrade_write+0x270/0x270 [ 679.458580] ? queue_io+0x3dd/0x800 [ 679.462577] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 679.468140] __writeback_inodes_wb+0x1b9/0x340 [ 679.473057] ? writeback_sb_inodes+0x11d0/0x11d0 [ 679.477831] ? __lock_is_held+0xb5/0x140 [ 679.482217] wb_writeback+0xa73/0xfc0 [ 679.486047] ? writeback_inodes_wb.constprop.49+0x330/0x330 [ 679.492076] ? widen_string+0xe0/0x2e0 [ 679.495990] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 679.501509] ? print_usage_bug+0xc0/0xc0 [ 679.505586] ? string+0x225/0x2d0 [ 679.509052] ? widen_string+0x2e0/0x2e0 [ 679.513428] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 679.518515] ? find_next_bit+0x104/0x130 [ 679.522949] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 679.527985] ? find_next_bit+0x104/0x130 [ 679.532549] ? cpumask_next+0x41/0x50 [ 679.536393] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 679.541787] ? get_nr_dirty_inodes+0xd6/0x130 [ 679.546358] ? __local_bh_enable_ip+0x160/0x260 [ 679.552575] ? get_nr_dirty_pages+0x17c/0x1f0 [ 679.557089] ? _raw_spin_unlock_bh+0x30/0x40 [ 679.561834] ? inode_sleep_on_writeback+0x240/0x240 [ 679.566868] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 679.572815] ? check_preemption_disabled+0x48/0x280 [ 679.577854] ? wb_workfn+0x521/0x1790 [ 679.581973] ? wb_workfn+0x521/0x1790 [ 679.585798] ? __local_bh_enable_ip+0x160/0x260 [ 679.590930] wb_workfn+0x1008/0x1790 [ 679.594679] ? __lock_acquire+0x62f/0x4c20 [ 679.598943] ? inode_wait_for_writeback+0x40/0x40 [ 679.604180] ? mark_held_locks+0x130/0x130 [ 679.608436] ? mark_held_locks+0x130/0x130 [ 679.613008] ? set_next_entity+0x493/0xc70 [ 679.617261] ? reweight_entity+0x10f0/0x10f0 [ 679.622022] ? zap_class+0x640/0x640 [ 679.625764] ? pick_next_task_fair+0xa05/0x1b30 [ 679.630853] ? rcu_read_lock_sched_held+0x14f/0x180 [ 679.635891] ? zap_class+0x640/0x640 [ 679.639628] ? debug_object_deactivate+0x2eb/0x450 [ 679.644934] ? lock_downgrade+0x900/0x900 [ 679.649102] ? find_held_lock+0x36/0x1c0 [ 679.653497] ? zap_class+0x640/0x640 [ 679.657233] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 679.663084] ? check_preemption_disabled+0x48/0x280 [ 679.668124] ? __lock_is_held+0xb5/0x140 [ 679.672641] process_one_work+0xc90/0x1c40 [ 679.676909] ? mark_held_locks+0x130/0x130 [ 679.682552] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 679.687238] ? __switch_to_asm+0x40/0x70 [ 679.691618] ? __switch_to_asm+0x34/0x70 [ 679.695707] ? __switch_to_asm+0x34/0x70 [ 679.700074] ? __switch_to_asm+0x40/0x70 [ 679.704176] ? __switch_to_asm+0x34/0x70 [ 679.708262] ? __switch_to_asm+0x40/0x70 [ 679.712701] ? __switch_to_asm+0x34/0x70 [ 679.716777] ? __switch_to_asm+0x40/0x70 [ 679.721189] ? __schedule+0x8d7/0x21d0 [ 679.725111] ? zap_class+0x640/0x640 [ 679.728842] ? lock_downgrade+0x900/0x900 [ 679.733363] ? kasan_check_read+0x11/0x20 [ 679.737541] ? do_raw_spin_unlock+0xa7/0x330 [ 679.742308] ? lock_acquire+0x1ed/0x520 [ 679.746322] ? worker_thread+0x3e0/0x1390 [ 679.750853] ? kasan_check_read+0x11/0x20 [ 679.755023] ? do_raw_spin_lock+0x14f/0x350 [ 679.759353] ? kasan_check_read+0x11/0x20 [ 679.763849] ? rwlock_bug.part.2+0x90/0x90 [ 679.768101] ? trace_hardirqs_on+0x310/0x310 [ 679.772877] worker_thread+0x17f/0x1390 [ 679.776868] ? __switch_to_asm+0x34/0x70 [ 679.781351] ? process_one_work+0x1c40/0x1c40 [ 679.785894] ? __sched_text_start+0x8/0x8 [ 679.790376] ? __kthread_parkme+0xce/0x1a0 [ 679.794662] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 679.800174] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 679.805322] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 679.811289] ? trace_hardirqs_on+0xbd/0x310 [ 679.815630] ? kasan_check_read+0x11/0x20 [ 679.820096] ? __kthread_parkme+0xce/0x1a0 [ 679.824347] ? trace_hardirqs_off_caller+0x310/0x310 [ 679.829474] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 679.834914] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 679.840781] ? __kthread_parkme+0xfb/0x1a0 [ 679.845047] kthread+0x35a/0x420 [ 679.848444] ? process_one_work+0x1c40/0x1c40 [ 679.853273] ? kthread_stop+0x900/0x900 [ 679.857266] ret_from_fork+0x3a/0x50 [ 679.861490] [ 679.861490] Showing all locks held in the system: [ 679.867829] 5 locks held by kworker/u4:0/7: [ 679.872599] #0: 00000000ce3fc1c2 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xb43/0x1c40 [ 679.882534] #1: 00000000d6c9c988 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb9a/0x1c40 [ 679.893473] #2: 00000000a32f172a (&type->s_umount_key#30){++++}, at: trylock_super+0x22/0x110 [ 679.902619] #3: 000000004f496d2d (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 [ 679.912069] #4: 00000000abe2b30d (&ei->i_data_sem){++++}, at: ext4_map_blocks+0x88f/0x1b40 [ 679.920915] 1 lock held by khungtaskd/980: [ 679.925156] #0: 000000004d289beb (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 [ 679.934108] 1 lock held by rsyslogd/5273: [ 679.938266] #0: 00000000bce88f8b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 [ 679.947538] 2 locks held by getty/5363: [ 679.951881] #0: 00000000bc7d06fd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 679.960445] #1: 000000005dc6654d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 679.969407] 2 locks held by getty/5364: [ 679.973697] #0: 00000000b74b0737 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 679.982312] #1: 000000000d7c9596 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 679.991492] 2 locks held by getty/5365: [ 679.995473] #0: 000000002db01519 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 680.004045] #1: 00000000feac9e10 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 680.013241] 2 locks held by getty/5366: [ 680.017220] #0: 00000000fa7b9c5d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 680.025813] #1: 0000000029958494 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 680.035175] 2 locks held by getty/5367: [ 680.039166] #0: 00000000c8499234 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 680.047760] #1: 000000008773936c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 680.057018] 2 locks held by getty/5368: [ 680.062601] #0: 000000004165be65 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 680.072117] #1: 0000000089cba62d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 680.081348] 2 locks held by getty/5369: [ 680.085852] #0: 00000000f3f983f2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 680.094474] #1: 00000000c8e059da (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 680.103706] 5 locks held by syz-executor827/5390: [ 680.108559] [ 680.110527] ============================================= [ 680.110527] [ 680.117559] NMI backtrace for cpu 0 [ 680.121247] CPU: 0 PID: 980 Comm: khungtaskd Not tainted 4.19.0+ #301 [ 680.127829] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 680.137182] Call Trace: [ 680.139780] dump_stack+0x244/0x39d [ 680.143514] ? dump_stack_print_info.cold.1+0x20/0x20 [ 680.148715] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 680.154270] nmi_cpu_backtrace.cold.1+0x5c/0xa1 [ 680.159040] ? lapic_can_unplug_cpu.cold.26+0x3f/0x3f [ 680.164244] nmi_trigger_cpumask_backtrace+0x1b3/0x1ed [ 680.169538] arch_trigger_cpumask_backtrace+0x14/0x20 [ 680.174740] watchdog+0xb3e/0x1050 [ 680.178304] ? reset_hung_task_detector+0xd0/0xd0 [ 680.183161] ? __kthread_parkme+0xce/0x1a0 [ 680.187408] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 680.192754] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 680.197866] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 680.202470] ? trace_hardirqs_on+0xbd/0x310 [ 680.206803] ? kasan_check_read+0x11/0x20 [ 680.210965] ? __kthread_parkme+0xce/0x1a0 [ 680.215209] ? trace_hardirqs_off_caller+0x310/0x310 [ 680.220323] ? trace_hardirqs_off_caller+0x310/0x310 [ 680.225436] ? lockdep_init_map+0x9/0x10 [ 680.229512] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 680.234656] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 680.241098] ? __kthread_parkme+0xfb/0x1a0 [ 680.245347] kthread+0x35a/0x420 [ 680.248730] ? reset_hung_task_detector+0xd0/0xd0 [ 680.253578] ? kthread_stop+0x900/0x900 [ 680.257562] ret_from_fork+0x3a/0x50 [ 680.261436] Sending NMI from CPU 0 to CPUs 1: [ 680.267263] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.137 msecs [ 680.267960] NMI backtrace for cpu 1 [ 680.267968] CPU: 1 PID: 5390 Comm: syz-executor827 Not tainted 4.19.0+ #301 [ 680.267976] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 680.267982] RIP: 0010:mext_check_coverage.constprop.13+0x174/0x510 [ 680.267997] Code: 49 83 7c 24 10 00 0f 84 e4 01 00 00 e8 f5 2f 60 ff 48 8b 95 70 ff ff ff 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 e3 02 00 00 4c 89 fa 48 89 5d 98 48 b8 00 00 00 00 00 fc ff [ 680.268002] RSP: 0018:ffff8801d7fcf1c0 EFLAGS: 00000246 [ 680.268013] RAX: dffffc0000000000 RBX: ffff8801d963a880 RCX: ffffffff821f5a82 [ 680.268020] RDX: 1ffff1003aff9e41 RSI: ffffffff821f591b RDI: ffff8801d963a890 [ 680.268027] RBP: ffff8801d7fcf270 R08: ffff8801d7d66400 R09: ffffed003b5e5b57 [ 680.268033] R10: ffffed003b5e5b57 R11: ffff8801daf2dabb R12: ffff8801d963a880 [ 680.268040] R13: 00000000f6986ac0 R14: ffff8801b73411f0 R15: ffff8801d7fcf3e0 [ 680.268047] FS: 0000000001fef880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 680.268053] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 680.268060] CR2: ffffffffff600400 CR3: 00000001d93df000 CR4: 00000000001406e0 [ 680.268064] Call Trace: [ 680.268069] ? mext_page_mkuptodate+0x12b0/0x12b0 [ 680.268073] ext4_move_extents+0x2784/0x3c20 [ 680.268079] ? ext4_double_up_write_data_sem+0x30/0x30 [ 680.268084] ? ext4_mark_iloc_dirty+0x17ca/0x2f00 [ 680.268089] ? perf_trace_sched_process_exec+0x860/0x860 [ 680.268094] ? lock_downgrade+0x900/0x900 [ 680.268099] ? kasan_check_write+0x14/0x20 [ 680.268103] ? __brelse+0x104/0x180 [ 680.268108] ? block_commit_write+0x30/0x30 [ 680.268113] ? __ext4_handle_dirty_metadata+0x1e0/0x5a0 [ 680.268118] ? kasan_check_write+0x14/0x20 [ 680.268122] ? zap_class+0x640/0x640 [ 680.268126] ? zap_class+0x640/0x640 [ 680.268132] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 680.268137] ? check_preemption_disabled+0x48/0x280 [ 680.268141] ? __lock_is_held+0xb5/0x140 [ 680.268146] ? rcu_read_lock_sched_held+0x14f/0x180 [ 680.268151] ? preempt_count_add+0xbc/0x1b0 [ 680.268156] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 680.268161] ? __mnt_want_write_file+0xa2/0xc0 [ 680.268166] ext4_ioctl+0x3154/0x4210 [ 680.268171] ? ext4_ioctl_group_add+0x560/0x560 [ 680.268175] ? find_held_lock+0x36/0x1c0 [ 680.268180] ? ext4_fallocate+0x375/0x2300 [ 680.268184] ? lock_downgrade+0x900/0x900 [ 680.268190] ? ext4_alloc_file_blocks+0x7f2/0xaf0 [ 680.268195] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 680.268200] ? check_preemption_disabled+0x48/0x280 [ 680.268205] ? __lock_is_held+0xb5/0x140 [ 680.268210] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 680.268215] ? ext4_fallocate+0x4a6/0x2300 [ 680.268219] ? zap_class+0x640/0x640 [ 680.268224] ? ext4_insert_range+0x1410/0x1410 [ 680.268228] ? find_held_lock+0x36/0x1c0 [ 680.268233] ? ext4_ioctl_group_add+0x560/0x560 [ 680.268238] do_vfs_ioctl+0x1de/0x1720 [ 680.268242] ? vfs_fallocate+0x7ab/0x940 [ 680.268247] ? ioctl_preallocate+0x300/0x300 [ 680.268253] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 680.268257] ? __fget_light+0x2e9/0x430 [ 680.268261] ? fget_raw+0x20/0x20 [ 680.268267] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 680.268272] ? check_preemption_disabled+0x48/0x280 [ 680.268277] ? do_syscall_64+0x9a/0x820 [ 680.268281] ? do_syscall_64+0x9a/0x820 [ 680.268286] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 680.268290] ? security_file_ioctl+0x94/0xc0 [ 680.268295] ksys_ioctl+0xa9/0xd0 [ 680.268299] __x64_sys_ioctl+0x73/0xb0 [ 680.268303] do_syscall_64+0x1b9/0x820 [ 680.268309] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 680.268314] ? syscall_return_slowpath+0x5e0/0x5e0 [ 680.268319] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 680.268324] ? trace_hardirqs_on_caller+0x310/0x310 [ 680.268329] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 680.268334] ? prepare_exit_to_usermode+0x291/0x3b0 [ 680.268339] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 680.268345] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 680.268349] RIP: 0033:0x4401d9 [ 680.268363] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 680.268368] RSP: 002b:00007ffe954e8808 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 680.268379] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401d9 [ 680.268401] RDX: 0000000020000040 RSI: 00000000c028660f RDI: 0000000000000003 [ 680.268408] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 680.268414] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401a60 [ 680.268421] R13: 0000000000401af0 R14: 0000000000000000 R15: 0000000000000000 [ 680.279194] Kernel panic - not syncing: hung_task: blocked tasks [ 680.722588] CPU: 0 PID: 980 Comm: khungtaskd Not tainted 4.19.0+ #301 [ 680.729168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 680.738521] Call Trace: [ 680.741123] dump_stack+0x244/0x39d [ 680.744764] ? dump_stack_print_info.cold.1+0x20/0x20 [ 680.749978] panic+0x238/0x4e7 [ 680.753183] ? add_taint.cold.5+0x16/0x16 [ 680.757346] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 680.762818] ? nmi_trigger_cpumask_backtrace+0x1c4/0x1ed [ 680.768274] ? nmi_trigger_cpumask_backtrace+0x173/0x1ed [ 680.773735] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 680.779202] watchdog+0xb4f/0x1050 [ 680.782768] ? reset_hung_task_detector+0xd0/0xd0 [ 680.787622] ? __kthread_parkme+0xce/0x1a0 [ 680.791879] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 680.796990] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 680.802104] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 680.806696] ? trace_hardirqs_on+0xbd/0x310 [ 680.811029] ? kasan_check_read+0x11/0x20 [ 680.815183] ? __kthread_parkme+0xce/0x1a0 [ 680.819430] ? trace_hardirqs_off_caller+0x310/0x310 [ 680.824543] ? trace_hardirqs_off_caller+0x310/0x310 [ 680.829660] ? lockdep_init_map+0x9/0x10 [ 680.833742] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 680.838855] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 680.844403] ? __kthread_parkme+0xfb/0x1a0 [ 680.848655] kthread+0x35a/0x420 [ 680.852037] ? reset_hung_task_detector+0xd0/0xd0 [ 680.856902] ? kthread_stop+0x900/0x900 [ 680.860885] ret_from_fork+0x3a/0x50 [ 680.865725] Kernel Offset: disabled [ 680.869354] Rebooting in 86400 seconds..