[....] 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. [ 27.412092] kauditd_printk_skb: 8 callbacks suppressed [ 27.412104] audit: type=1800 audit(1537919368.946:29): pid=5247 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.438301] audit: type=1800 audit(1537919368.946:30): pid=5247 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.84' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 556.189068] INFO: task jbd2/sda1-8:3080 blocked for more than 140 seconds. [ 556.196373] Not tainted 4.19.0-rc5+ #31 [ 556.202222] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 556.210337] jbd2/sda1-8 D18264 3080 2 0x80000000 [ 556.215982] Call Trace: [ 556.218581] __schedule+0x86c/0x1ed0 [ 556.222444] ? __sched_text_start+0x8/0x8 [ 556.226659] ? mark_held_locks+0xc7/0x130 [ 556.230956] ? graph_lock+0x170/0x170 [ 556.235488] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.240730] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.245846] ? lockdep_hardirqs_on+0x421/0x5c0 [ 556.250573] ? trace_hardirqs_on+0xbd/0x310 [ 556.254912] ? kasan_check_read+0x11/0x20 [ 556.259192] ? prepare_to_wait+0x1b3/0x3f0 [ 556.263440] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 556.269023] ? find_held_lock+0x36/0x1c0 [ 556.273108] schedule+0xfe/0x460 [ 556.276481] ? lock_downgrade+0x900/0x900 [ 556.280784] ? __schedule+0x1ed0/0x1ed0 [ 556.284777] ? kasan_check_read+0x11/0x20 [ 556.289063] ? do_raw_spin_unlock+0xa7/0x2f0 [ 556.293511] ? do_raw_write_trylock+0x1c0/0x1c0 [ 556.298195] ? kasan_check_write+0x14/0x20 [ 556.302643] ? do_raw_spin_lock+0xc1/0x200 [ 556.306900] jbd2_journal_commit_transaction+0xd42/0x89f8 [ 556.312588] ? update_group_capacity+0x1060/0x1060 [ 556.317532] ? mark_held_locks+0x130/0x130 [ 556.321934] ? print_usage_bug+0xc0/0xc0 [ 556.326036] ? journal_submit_commit_record+0xb60/0xb60 [ 556.333059] ? __lock_acquire+0x7ec/0x4ec0 [ 556.337314] ? mark_held_locks+0x130/0x130 [ 556.341736] ? __update_load_avg_se+0xb90/0xb90 [ 556.346439] ? find_busiest_group+0x100/0x1d20 [ 556.351153] ? print_usage_bug+0xc0/0xc0 [ 556.355224] ? update_sd_lb_stats+0x2a40/0x2a40 [ 556.360032] ? finish_wait+0x430/0x430 [ 556.363942] ? __lock_acquire+0x7ec/0x4ec0 [ 556.368195] ? __lock_acquire+0x7ec/0x4ec0 [ 556.372587] ? lock_repin_lock+0x430/0x430 [ 556.376836] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 556.381990] ? print_usage_bug+0xc0/0xc0 [ 556.386064] ? mark_held_locks+0x130/0x130 [ 556.390435] ? load_balance+0x6dd/0x3430 [ 556.394512] ? find_held_lock+0x36/0x1c0 [ 556.398597] ? print_usage_bug+0xc0/0xc0 [ 556.402800] ? rq_online_fair+0x4d0/0x4d0 [ 556.406962] ? __lock_acquire+0x7ec/0x4ec0 [ 556.411337] ? find_busiest_group+0x1d20/0x1d20 [ 556.416021] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 556.421433] ? rcu_bh_qs+0xc0/0xc0 [ 556.424995] ? __lock_acquire+0x7ec/0x4ec0 [ 556.429429] ? mark_held_locks+0x130/0x130 [ 556.433684] ? graph_lock+0x170/0x170 [ 556.437500] ? mark_held_locks+0x130/0x130 [ 556.441893] ? graph_lock+0x170/0x170 [ 556.445716] ? print_usage_bug+0xc0/0xc0 [ 556.449928] ? graph_lock+0x170/0x170 [ 556.453740] ? print_usage_bug+0xc0/0xc0 [ 556.457811] ? lock_is_held_type+0x210/0x210 [ 556.463355] ? __lock_acquire+0x7ec/0x4ec0 [ 556.467605] ? find_held_lock+0x36/0x1c0 [ 556.471817] ? find_held_lock+0x36/0x1c0 [ 556.475907] ? __lock_acquire+0x7ec/0x4ec0 [ 556.480278] ? __lock_acquire+0x7ec/0x4ec0 [ 556.484537] ? kasan_check_read+0x11/0x20 [ 556.488701] ? finish_task_switch+0x1f5/0x900 [ 556.493362] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 556.498824] ? compat_start_thread+0x80/0x80 [ 556.503381] ? mark_held_locks+0x130/0x130 [ 556.507626] ? mark_held_locks+0x130/0x130 [ 556.512431] ? kasan_check_write+0x14/0x20 [ 556.516671] ? finish_task_switch+0x2f5/0x900 [ 556.521287] ? graph_lock+0x170/0x170 [ 556.525105] ? preempt_notifier_register+0x200/0x200 [ 556.530357] ? __switch_to_asm+0x34/0x70 [ 556.534438] ? __switch_to_asm+0x34/0x70 [ 556.538505] ? __switch_to_asm+0x34/0x70 [ 556.542718] ? __switch_to_asm+0x40/0x70 [ 556.546789] ? __switch_to_asm+0x34/0x70 [ 556.550980] ? __switch_to_asm+0x40/0x70 [ 556.555053] ? __switch_to_asm+0x34/0x70 [ 556.559245] ? __switch_to_asm+0x34/0x70 [ 556.563325] ? __switch_to_asm+0x34/0x70 [ 556.567400] ? graph_lock+0x170/0x170 [ 556.571357] ? lock_acquire+0x1ed/0x520 [ 556.575345] ? lock_timer_base+0xbb/0x2b0 [ 556.579660] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.584781] ? find_held_lock+0x36/0x1c0 [ 556.589910] ? try_to_del_timer_sync+0xec/0x140 [ 556.594604] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.599851] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.605587] ? lockdep_hardirqs_on+0x421/0x5c0 [ 556.610358] ? trace_hardirqs_on+0xbd/0x310 [ 556.614690] ? kasan_check_read+0x11/0x20 [ 556.618849] ? try_to_del_timer_sync+0xec/0x140 [ 556.623672] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 556.629242] ? stub_timer+0x10/0x10 [ 556.632882] ? del_timer_sync+0xf8/0x270 [ 556.636958] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 556.642209] ? try_to_del_timer_sync+0xec/0x140 [ 556.646890] ? del_timer+0x150/0x150 [ 556.650789] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 556.656351] kjournald2+0x26d/0xb30 [ 556.660117] ? __bpf_trace_jbd2_end_commit+0x30/0x30 [ 556.665232] ? __kthread_parkme+0xce/0x1a0 [ 556.669610] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.674725] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 556.679999] ? lockdep_hardirqs_on+0x421/0x5c0 [ 556.684596] ? trace_hardirqs_on+0xbd/0x310 [ 556.689134] ? finish_wait+0x430/0x430 [ 556.693046] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 556.698505] ? kasan_check_write+0x14/0x20 [ 556.702886] ? do_raw_spin_lock+0xc1/0x200 [ 556.707145] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 556.712414] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 556.717991] ? __kthread_parkme+0xfb/0x1a0 [ 556.723342] kthread+0x35a/0x420 [ 556.726722] ? __bpf_trace_jbd2_end_commit+0x30/0x30 [ 556.731957] ? kthread_bind+0x40/0x40 [ 556.735776] ret_from_fork+0x3a/0x50 [ 556.739675] [ 556.739675] Showing all locks held in the system: [ 556.746004] 4 locks held by kworker/u4:0/7: [ 556.750485] #0: 00000000aa6c8bb2 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xb43/0x1b90 [ 556.760189] #1: 00000000f9dac9e0 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb9a/0x1b90 [ 556.770923] #2: 000000007b735469 (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 [ 556.779931] #3: 00000000f0e3d610 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0x9a/0x1a0 [ 556.789203] 1 lock held by khungtaskd/984: [ 556.793435] #0: 00000000e51faee2 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 [ 556.802245] 3 locks held by rs:main Q:Reg/5283: [ 556.806946] #0: 00000000baf22b75 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 [ 556.815164] #1: 00000000f7448627 (sb_writers#3){.+.+}, at: vfs_write+0x42a/0x560 [ 556.823005] #2: 00000000eed402f3 (&sb->s_type->i_mutex_key#9){+.+.}, at: ext4_file_write_iter+0x2a1/0x1420 [ 556.833083] 1 lock held by rsyslogd/5285: [ 556.837234] #0: 000000005b60dfe0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 [ 556.845411] 2 locks held by getty/5375: [ 556.850497] #0: 00000000cfa9a497 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.858773] #1: 00000000d234895e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.867797] 2 locks held by getty/5376: [ 556.871894] #0: 000000006b019374 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.880280] #1: 00000000f9354097 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.889366] 2 locks held by getty/5377: [ 556.893334] #0: 00000000bc48aaea (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.901752] #1: 0000000026a39f77 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.910759] 2 locks held by getty/5378: [ 556.914730] #0: 000000007d269c3b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.923119] #1: 000000001ebeb484 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.932123] 2 locks held by getty/5379: [ 556.936095] #0: 0000000060a2d041 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.944491] #1: 00000000d248085e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.953480] 2 locks held by getty/5380: [ 556.957454] #0: 00000000f28fd7b1 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.965850] #1: 00000000fe52699e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.974861] 2 locks held by getty/5381: [ 556.978837] #0: 00000000131097ea (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 [ 556.988268] #1: 0000000046c04e0b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 [ 556.997359] 6 locks held by syz-executor070/5403: [ 557.002323] [ 557.003960] ============================================= [ 557.003960] [ 557.011111] NMI backtrace for cpu 1 [ 557.014748] CPU: 1 PID: 984 Comm: khungtaskd Not tainted 4.19.0-rc5+ #31 [ 557.021582] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 557.030935] Call Trace: [ 557.033536] dump_stack+0x1c4/0x2b4 [ 557.037188] ? dump_stack_print_info.cold.2+0x52/0x52 [ 557.042403] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 557.047955] nmi_cpu_backtrace.cold.3+0x63/0xa2 [ 557.052634] ? lapic_can_unplug_cpu.cold.27+0x3f/0x3f [ 557.057828] nmi_trigger_cpumask_backtrace+0x1b3/0x1ed [ 557.063116] arch_trigger_cpumask_backtrace+0x14/0x20 [ 557.068317] watchdog+0xb3e/0x1050 [ 557.071872] ? reset_hung_task_detector+0xd0/0xd0 [ 557.076723] ? __kthread_parkme+0xce/0x1a0 [ 557.080970] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 557.086090] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 557.091198] ? lockdep_hardirqs_on+0x421/0x5c0 [ 557.095784] ? trace_hardirqs_on+0xbd/0x310 [ 557.100128] ? kasan_check_read+0x11/0x20 [ 557.104296] ? __kthread_parkme+0xce/0x1a0 [ 557.108542] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 557.114001] ? kasan_check_write+0x14/0x20 [ 557.118238] ? do_raw_spin_lock+0xc1/0x200 [ 557.122485] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 557.127593] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 557.133133] ? __kthread_parkme+0xfb/0x1a0 [ 557.137379] kthread+0x35a/0x420 [ 557.140755] ? reset_hung_task_detector+0xd0/0xd0 [ 557.145609] ? kthread_bind+0x40/0x40 [ 557.149419] ret_from_fork+0x3a/0x50 [ 557.153252] Sending NMI from CPU 1 to CPUs 0: [ 557.159065] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.158 msecs [ 557.159781] NMI backtrace for cpu 0 [ 557.159789] CPU: 0 PID: 5403 Comm: syz-executor070 Not tainted 4.19.0-rc5+ #31 [ 557.159797] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 557.159801] RIP: 0010:write_comp_data+0x22/0x70 [ 557.159815] Code: 90 90 90 90 90 90 90 90 55 65 4c 8b 04 25 40 ee 01 00 65 8b 05 0f 0a 83 7e a9 00 01 1f 00 48 89 e5 75 51 41 8b 80 d0 12 00 00 <83> f8 03 75 45 49 8b 80 d8 12 00 00 45 8b 80 d4 12 00 00 4c 8b 08 [ 557.159820] RSP: 0018:ffff8801baaa70f8 EFLAGS: 00000246 [ 557.159830] RAX: 0000000000000000 RBX: ffff8801c77ca1d8 RCX: ffffffff82115883 [ 557.159837] RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000004 [ 557.159843] RBP: ffff8801baaa70f8 R08: ffff8801bbb54300 R09: 1ffffffff12f45ed [ 557.159849] R10: ffffed003b584732 R11: ffff8801dac23993 R12: 0000000000000001 [ 557.159856] R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 [ 557.159863] FS: 0000000000ceb880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 557.159876] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 557.159882] CR2: ffffffffff600400 CR3: 00000001be4ef000 CR4: 00000000001406f0 [ 557.159886] Call Trace: [ 557.159891] __sanitizer_cov_trace_cmp4+0x16/0x20 [ 557.159895] ext4_ext_drop_refs+0xb3/0xf0 [ 557.159899] ext4_find_extent+0xdc/0x9b0 [ 557.159909] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 557.159913] ? ext4_ext_find_goal+0x1d0/0x210 [ 557.159918] mext_check_coverage.constprop.13+0x2b0/0x510 [ 557.159923] ? mext_page_mkuptodate+0x12b0/0x12b0 [ 557.159928] ext4_move_extents+0x2784/0x3c20 [ 557.159933] ? ext4_double_up_write_data_sem+0x30/0x30 [ 557.159937] ? save_stack+0xa9/0xd0 [ 557.159941] ? save_stack+0x43/0xd0 [ 557.159946] ? __kasan_slab_free+0x102/0x150 [ 557.159950] ? kasan_slab_free+0xe/0x10 [ 557.159954] ? kmem_cache_free+0x83/0x290 [ 557.159959] ? print_usage_bug+0xc0/0xc0 [ 557.159963] ? ext4_fallocate+0xa33/0x2300 [ 557.159967] ? vfs_fallocate+0x4b4/0x940 [ 557.159972] ? ksys_fallocate+0x56/0x90 [ 557.159976] ? do_syscall_64+0x1b9/0x820 [ 557.159981] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 557.159986] ? trace_hardirqs_off+0xb8/0x310 [ 557.159990] ? kasan_check_read+0x11/0x20 [ 557.159995] ? do_raw_spin_unlock+0xa7/0x2f0 [ 557.159999] ? trace_hardirqs_on+0x310/0x310 [ 557.160004] ? kasan_check_write+0x14/0x20 [ 557.160008] ? graph_lock+0x170/0x170 [ 557.160013] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 557.160018] ? check_preemption_disabled+0x48/0x200 [ 557.160023] ? check_preemption_disabled+0x48/0x200 [ 557.160027] ? graph_lock+0x170/0x170 [ 557.160032] ? __lock_is_held+0xb5/0x140 [ 557.160036] ? graph_lock+0x170/0x170 [ 557.160041] ? check_preemption_disabled+0x48/0x200 [ 557.160046] ? check_preemption_disabled+0x48/0x200 [ 557.160050] ? __lock_is_held+0xb5/0x140 [ 557.160055] ? rcu_read_lock_sched_held+0x108/0x120 [ 557.160059] ? preempt_count_add+0x7d/0x160 [ 557.160065] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 557.160069] ? __mnt_want_write_file+0xa2/0xc0 [ 557.160073] ext4_ioctl+0x3154/0x4210 [ 557.160078] ? ext4_ioctl_group_add+0x560/0x560 [ 557.160082] ? find_held_lock+0x36/0x1c0 [ 557.160087] ? ext4_fallocate+0x375/0x2300 [ 557.160091] ? lock_downgrade+0x900/0x900 [ 557.160096] ? ext4_alloc_file_blocks+0x7f2/0xaf0 [ 557.160101] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 557.160106] ? check_preemption_disabled+0x48/0x200 [ 557.160111] ? check_preemption_disabled+0x48/0x200 [ 557.160115] ? smk_access+0x53b/0x700 [ 557.160119] ? __lock_is_held+0xb5/0x140 [ 557.160125] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 557.160129] ? smack_log+0x423/0x590 [ 557.160133] ? smk_access_entry+0x310/0x310 [ 557.160138] ? ext4_fallocate+0x4a6/0x2300 [ 557.160142] ? graph_lock+0x170/0x170 [ 557.160146] ? smk_tskacc+0x3dd/0x520 [ 557.160151] ? ext4_insert_range+0x1410/0x1410 [ 557.160155] ? smack_privileged+0xd0/0xd0 [ 557.160160] ? ext4_ioctl_group_add+0x560/0x560 [ 557.160164] do_vfs_ioctl+0x1de/0x1720 [ 557.160168] ? vfs_fallocate+0x7ab/0x940 [ 557.160173] ? ioctl_preallocate+0x300/0x300 [ 557.160177] ? smk_curacc+0x7f/0xa0 [ 557.160181] ? smack_file_ioctl+0x210/0x3c0 [ 557.160186] ? fget_raw+0x20/0x20 [ 557.160191] ? smack_file_lock+0x2e0/0x2e0 [ 557.160195] ? do_syscall_64+0x9a/0x820 [ 557.160199] ? do_syscall_64+0x9a/0x820 [ 557.160205] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 557.160209] ? security_file_ioctl+0x94/0xc0 [ 557.160213] ksys_ioctl+0xa9/0xd0 [ 557.160217] __x64_sys_ioctl+0x73/0xb0 [ 557.160221] do_syscall_64+0x1b9/0x820 [ 557.160226] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 557.160231] ? syscall_return_slowpath+0x5e0/0x5e0 [ 557.160236] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 557.160241] ? trace_hardirqs_on_caller+0x310/0x310 [ 557.160246] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 557.160251] ? prepare_exit_to_usermode+0x291/0x3b0 [ 557.160256] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 557.160261] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 557.160264] RIP: 0033:0x440169 [ 557.160278] 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 [ 557.160283] RSP: 002b:00007ffc0db86c28 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 557.160294] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440169 [ 557.160306] RDX: 0000000020000040 RSI: 00000000c028660f RDI: 0000000000000003 [ 557.160313] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 557.160319] R10: 00000000004002c8 R11: 0000000000000217 R12: 00000000004019f0 [ 557.160325] R13: 0000000000401a80 R14: 0000000000000000 R15: 0000000000000000 [ 557.162858] Kernel panic - not syncing: hung_task: blocked tasks [ 557.707917] CPU: 1 PID: 984 Comm: khungtaskd Not tainted 4.19.0-rc5+ #31 [ 557.714752] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 557.724112] Call Trace: [ 557.726725] dump_stack+0x1c4/0x2b4 [ 557.730359] ? dump_stack_print_info.cold.2+0x52/0x52 [ 557.735564] panic+0x238/0x4e7 [ 557.738759] ? add_taint.cold.5+0x16/0x16 [ 557.742916] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 557.748380] ? nmi_trigger_cpumask_backtrace+0x1c4/0x1ed [ 557.753837] ? nmi_trigger_cpumask_backtrace+0x173/0x1ed [ 557.759295] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 557.764760] watchdog+0xb4f/0x1050 [ 557.768334] ? reset_hung_task_detector+0xd0/0xd0 [ 557.773197] ? __kthread_parkme+0xce/0x1a0 [ 557.777441] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 557.782551] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 557.787655] ? lockdep_hardirqs_on+0x421/0x5c0 [ 557.792240] ? trace_hardirqs_on+0xbd/0x310 [ 557.796575] ? kasan_check_read+0x11/0x20 [ 557.800729] ? __kthread_parkme+0xce/0x1a0 [ 557.804969] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 557.810426] ? kasan_check_write+0x14/0x20 [ 557.814683] ? do_raw_spin_lock+0xc1/0x200 [ 557.818928] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 557.824038] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 557.829582] ? __kthread_parkme+0xfb/0x1a0 [ 557.833835] kthread+0x35a/0x420 [ 557.837206] ? reset_hung_task_detector+0xd0/0xd0 [ 557.842054] ? kthread_bind+0x40/0x40 [ 557.845860] ret_from_fork+0x3a/0x50 [ 557.850629] Kernel Offset: disabled [ 557.854258] Rebooting in 86400 seconds..