[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 54.599442][ T26] audit: type=1800 audit(1572569941.272:25): pid=8454 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 54.641222][ T26] audit: type=1800 audit(1572569941.282:26): pid=8454 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 54.704778][ T26] audit: type=1800 audit(1572569941.282:27): pid=8454 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.22' (ECDSA) to the list of known hosts. syzkaller login: [ 234.869719][ T1077] INFO: task kworker/u4:1:21 blocked for more than 143 seconds. [ 234.877490][ T1077] Not tainted 5.4.0-rc5-next-20191031 #0 [ 234.883888][ T1077] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 234.892604][ T1077] kworker/u4:1 D24344 21 2 0x80004000 [ 234.898946][ T1077] Workqueue: writeback wb_workfn (flush-8:0) [ 234.904962][ T1077] Call Trace: [ 234.908259][ T1077] __schedule+0x94a/0x1e70 [ 234.912732][ T1077] ? __sched_text_start+0x8/0x8 [ 234.917587][ T1077] ? blk_insert_cloned_request+0x530/0x530 [ 234.923442][ T1077] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 234.929723][ T1077] ? kthread_data+0x58/0xc0 [ 234.934268][ T1077] schedule+0xdc/0x2b0 [ 234.938405][ T1077] io_schedule+0x1c/0x70 [ 234.942782][ T1077] __lock_page+0x422/0xab0 [ 234.947205][ T1077] ? wait_on_page_bit+0xa60/0xa60 [ 234.953050][ T1077] ? page_cache_next_miss+0x340/0x340 [ 234.958419][ T1077] ? ___might_sleep+0x163/0x2c0 [ 234.963333][ T1077] ? __might_sleep+0x95/0x190 [ 234.968018][ T1077] mpage_prepare_extent_to_map+0xb3f/0xf90 [ 234.973892][ T1077] ? mpage_process_page_bufs+0x780/0x780 [ 234.979531][ T1077] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 234.985390][ T1077] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 234.991485][ T1077] ? __kmalloc_node+0xf/0x70 [ 234.996087][ T1077] ext4_writepages+0x954/0x2e70 [ 235.000994][ T1077] ? ___might_sleep+0x163/0x2c0 [ 235.005852][ T1077] ? __might_sleep+0x40/0x190 [ 235.010594][ T1077] ? mark_lock+0xb1/0x1220 [ 235.015016][ T1077] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 235.020540][ T1077] ? __kasan_check_read+0x11/0x20 [ 235.025565][ T1077] ? __lock_acquire+0x16f2/0x4a00 [ 235.030631][ T1077] ? __kasan_check_read+0x11/0x20 [ 235.035652][ T1077] ? mark_lock+0xc2/0x1220 [ 235.040134][ T1077] ? mark_held_locks+0xf0/0xf0 [ 235.044902][ T1077] ? __kasan_check_read+0x11/0x20 [ 235.049964][ T1077] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 235.055418][ T1077] do_writepages+0xfa/0x2a0 [ 235.059990][ T1077] ? do_writepages+0xfa/0x2a0 [ 235.064668][ T1077] ? page_writeback_cpu_online+0x20/0x20 [ 235.070344][ T1077] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 235.076503][ T1077] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 235.082850][ T1077] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 235.088837][ T1077] __writeback_single_inode+0x136/0x1400 [ 235.094511][ T1077] ? _raw_spin_unlock+0x28/0x40 [ 235.099386][ T1077] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 235.105678][ T1077] ? wbc_attach_and_unlock_inode+0x5bf/0x920 [ 235.111697][ T1077] writeback_sb_inodes+0x596/0xf20 [ 235.116918][ T1077] ? __writeback_single_inode+0x1400/0x1400 [ 235.122858][ T1077] ? trylock_super+0x22/0x110 [ 235.127548][ T1077] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 235.133887][ T1077] __writeback_inodes_wb+0xc3/0x260 [ 235.139095][ T1077] wb_writeback+0x910/0xd90 [ 235.143656][ T1077] ? mark_lock+0xc2/0x1220 [ 235.148080][ T1077] ? writeback_inodes_wb.constprop.0+0x1a0/0x1a0 [ 235.154448][ T1077] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 235.160218][ T1077] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 235.165929][ T1077] ? get_nr_dirty_inodes+0xe2/0x140 [ 235.171180][ T1077] wb_workfn+0xba5/0x1220 [ 235.175528][ T1077] ? inode_wait_for_writeback+0x40/0x40 [ 235.181135][ T1077] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 235.187298][ T1077] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 235.193462][ T1077] ? trace_hardirqs_on+0x67/0x240 [ 235.198497][ T1077] process_one_work+0x9af/0x1740 [ 235.203506][ T1077] ? pwq_dec_nr_in_flight+0x320/0x320 [ 235.208878][ T1077] ? lock_acquire+0x190/0x410 [ 235.214333][ T1077] worker_thread+0x98/0xe40 [ 235.218855][ T1077] kthread+0x361/0x430 [ 235.222980][ T1077] ? process_one_work+0x1740/0x1740 [ 235.228173][ T1077] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 235.233929][ T1077] ret_from_fork+0x24/0x30 [ 235.238371][ T1077] INFO: task khugepaged:1086 blocked for more than 143 seconds. [ 235.246090][ T1077] Not tainted 5.4.0-rc5-next-20191031 #0 [ 235.252273][ T1077] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 235.260987][ T1077] khugepaged D27704 1086 2 0x80004000 [ 235.267318][ T1077] Call Trace: [ 235.270663][ T1077] __schedule+0x94a/0x1e70 [ 235.275090][ T1077] ? __sched_text_start+0x8/0x8 [ 235.279991][ T1077] ? blk_insert_cloned_request+0x530/0x530 [ 235.285907][ T1077] ? _raw_spin_unlock_irq+0x23/0x80 [ 235.291416][ T1077] ? __lock_page+0x3d9/0xab0 [ 235.295996][ T1077] ? _raw_spin_unlock_irq+0x23/0x80 [ 235.301242][ T1077] schedule+0xdc/0x2b0 [ 235.305319][ T1077] io_schedule+0x1c/0x70 [ 235.309569][ T1077] __lock_page+0x422/0xab0 [ 235.314052][ T1077] ? wait_on_page_bit+0xa60/0xa60 [ 235.319231][ T1077] ? page_cache_next_miss+0x340/0x340 [ 235.324668][ T1077] ? ___might_sleep+0x163/0x2c0 [ 235.329527][ T1077] ? __might_sleep+0x95/0x190 [ 235.334373][ T1077] mpage_prepare_extent_to_map+0xb3f/0xf90 [ 235.340908][ T1077] ? mpage_process_page_bufs+0x780/0x780 [ 235.346538][ T1077] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 235.352576][ T1077] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 235.358816][ T1077] ext4_writepages+0xb6a/0x2e70 [ 235.363732][ T1077] ? get_page_from_freelist+0x21fb/0x4330 [ 235.369447][ T1077] ? find_held_lock+0x35/0x130 [ 235.374270][ T1077] ? get_page_from_freelist+0x21fb/0x4330 [ 235.380064][ T1077] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 235.385519][ T1077] ? 0xffffffff81000000 [ 235.389732][ T1077] ? mark_lock+0xc2/0x1220 [ 235.394150][ T1077] ? prep_new_page+0x19f/0x200 [ 235.398909][ T1077] ? wbc_attach_and_unlock_inode+0x515/0x920 [ 235.404938][ T1077] ? find_held_lock+0x35/0x130 [ 235.409758][ T1077] ? wbc_attach_and_unlock_inode+0x515/0x920 [ 235.415737][ T1077] ? ext4_mark_inode_dirty+0x9b0/0x9b0 [ 235.421261][ T1077] do_writepages+0xfa/0x2a0 [ 235.425767][ T1077] ? do_writepages+0xfa/0x2a0 [ 235.430494][ T1077] ? lock_downgrade+0x920/0x920 [ 235.435351][ T1077] ? page_writeback_cpu_online+0x20/0x20 [ 235.441036][ T1077] ? __kasan_check_read+0x11/0x20 [ 235.446063][ T1077] ? do_raw_spin_unlock+0x57/0x270 [ 235.451221][ T1077] ? _raw_spin_unlock+0x28/0x40 [ 235.456064][ T1077] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 235.462369][ T1077] ? wbc_attach_and_unlock_inode+0x5bf/0x920 [ 235.468340][ T1077] __filemap_fdatawrite_range+0x2bc/0x3b0 [ 235.474839][ T1077] ? delete_from_page_cache_batch+0xfe0/0xfe0 [ 235.481004][ T1077] ? lockdep_hardirqs_on+0x421/0x5e0 [ 235.486293][ T1077] filemap_flush+0x24/0x30 [ 235.490760][ T1077] collapse_file+0x36b1/0x41a0 [ 235.495535][ T1077] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 235.501750][ T1077] ? khugepaged+0x21c0/0x4360 [ 235.506435][ T1077] ? trace_event_raw_event_mm_collapse_huge_page_isolate+0x370/0x370 [ 235.514701][ T1077] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 235.520483][ T1077] ? khugepaged_find_target_node+0x142/0x180 [ 235.526478][ T1077] khugepaged+0x2da9/0x4360 [ 235.531081][ T1077] ? __kasan_check_read+0x11/0x20 [ 235.536111][ T1077] ? __lock_acquire+0x16f2/0x4a00 [ 235.541199][ T1077] ? _raw_spin_unlock_irq+0x23/0x80 [ 235.546401][ T1077] ? finish_task_switch+0x147/0x750 [ 235.551646][ T1077] ? _raw_spin_unlock_irq+0x23/0x80 [ 235.556856][ T1077] ? lockdep_hardirqs_on+0x421/0x5e0 [ 235.562216][ T1077] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 235.567848][ T1077] ? lock_downgrade+0x920/0x920 [ 235.572755][ T1077] ? finish_wait+0x260/0x260 [ 235.577351][ T1077] ? lockdep_hardirqs_on+0x421/0x5e0 [ 235.582704][ T1077] ? trace_hardirqs_on+0x67/0x240 [ 235.587737][ T1077] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 235.594062][ T1077] ? __kthread_parkme+0x108/0x1c0 [ 235.599086][ T1077] ? __kasan_check_read+0x11/0x20 [ 235.604909][ T1077] kthread+0x361/0x430 [ 235.608977][ T1077] ? collapse_pte_mapped_thp+0xbe0/0xbe0 [ 235.614939][ T1077] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 235.620733][ T1077] ret_from_fork+0x24/0x30 [ 235.625248][ T1077] [ 235.625248][ T1077] Showing all locks held in the system: [ 235.633006][ T1077] 4 locks held by kworker/u4:1/21: [ 235.638107][ T1077] #0: ffff8880a7e4e128 ((wq_completion)writeback){+.+.}, at: process_one_work+0x88b/0x1740 [ 235.648226][ T1077] #1: ffff8880a9a07dc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x8c1/0x1740 [ 235.659558][ T1077] #2: ffff88809b21e0d8 (&type->s_umount_key#32){++++}, at: trylock_super+0x22/0x110 [ 235.669099][ T1077] #3: ffff88809b220990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0 [ 235.678962][ T1077] 1 lock held by khungtaskd/1077: [ 235.684019][ T1077] #0: ffffffff88faba40 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 235.693341][ T1077] 1 lock held by khugepaged/1086: [ 235.698343][ T1077] #0: ffff88809b220990 (&sbi->s_journal_flag_rwsem){.+.+}, at: do_writepages+0xfa/0x2a0 [ 235.708252][ T1077] 2 locks held by getty/8582: [ 235.712953][ T1077] #0: ffff888097fb4090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.721940][ T1077] #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.732200][ T1077] 2 locks held by getty/8583: [ 235.736862][ T1077] #0: ffff8880a8f15090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.745854][ T1077] #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.755453][ T1077] 2 locks held by getty/8584: [ 235.760247][ T1077] #0: ffff888096948090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.769185][ T1077] #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.778801][ T1077] 2 locks held by getty/8585: [ 235.783511][ T1077] #0: ffff88809258e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.792500][ T1077] #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.802109][ T1077] 2 locks held by getty/8586: [ 235.806765][ T1077] #0: ffff88809c461090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.815762][ T1077] #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.825348][ T1077] 2 locks held by getty/8587: [ 235.830053][ T1077] #0: ffff88809309a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.838996][ T1077] #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.848603][ T1077] 2 locks held by getty/8588: [ 235.853300][ T1077] #0: ffff8880a79f0090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 235.863118][ T1077] #1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 235.872763][ T1077] 1 lock held by syz-execprog/8613: [ 235.877944][ T1077] #0: ffff8880a315f3a8 (&ei->i_mmap_sem){++++}, at: ext4_filemap_fault+0x7e/0xb2 [ 235.887209][ T1077] [ 235.889543][ T1077] ============================================= [ 235.889543][ T1077] [ 235.897986][ T1077] NMI backtrace for cpu 0 [ 235.902356][ T1077] CPU: 0 PID: 1077 Comm: khungtaskd Not tainted 5.4.0-rc5-next-20191031 #0 [ 235.910935][ T1077] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 235.920979][ T1077] Call Trace: [ 235.924265][ T1077] dump_stack+0x172/0x1f0 [ 235.928585][ T1077] nmi_cpu_backtrace.cold+0x70/0xb2 [ 235.933764][ T1077] ? vprintk_func+0x86/0x189 [ 235.938384][ T1077] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 235.944015][ T1077] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 235.950033][ T1077] arch_trigger_cpumask_backtrace+0x14/0x20 [ 235.955918][ T1077] watchdog+0xc8f/0x1350 [ 235.960152][ T1077] kthread+0x361/0x430 [ 235.964211][ T1077] ? reset_hung_task_detector+0x30/0x30 [ 235.969747][ T1077] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 235.975462][ T1077] ret_from_fork+0x24/0x30 [ 235.979980][ T1077] Sending NMI from CPU 0 to CPUs 1: [ 235.985724][ C1] NMI backtrace for cpu 1 [ 235.985730][ C1] CPU: 1 PID: 8609 Comm: syz-execprog Not tainted 5.4.0-rc5-next-20191031 #0 [ 235.985735][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 235.985739][ C1] RIP: 0010:update_curr+0x36a/0x8d0 [ 235.985749][ C1] Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b8 04 00 00 4c 8b ab 78 10 00 00 e8 a1 bd 0c 00 85 c0 74 0d 80 3d 4b ec 70 08 00 <0f> 84 b4 02 00 00 49 8d 7d 78 48 b8 00 00 00 00 00 fc ff df 48 89 [ 235.985752][ C1] RSP: 0018:ffff8880a8d8f760 EFLAGS: 00000046 [ 235.985759][ C1] RAX: 0000000000000001 RBX: ffff8880962d0500 RCX: 1ffffffff1390a0e [ 235.985764][ C1] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880962d0d1c [ 235.985768][ C1] RBP: ffff8880a8d8f7a0 R08: 1ffff11015d26b7c R09: ffffed1015d26b7d [ 235.985772][ C1] R10: ffffed1015d26b7c R11: ffff8880ae935be3 R12: ffff8880ae934dc0 [ 235.985777][ C1] R13: ffffffff88fcada0 R14: ffff8880962d0480 R15: 0000000000005f09 [ 235.985781][ C1] FS: 00000000014e2c48(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 235.985785][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 235.985790][ C1] CR2: 00000000018d8000 CR3: 0000000099d97000 CR4: 00000000001406e0 [ 235.985794][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 235.985798][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 235.985801][ C1] Call Trace: [ 235.985804][ C1] ? record_times+0x1e/0x2b0 [ 235.985807][ C1] dequeue_entity+0x1e/0x1150 [ 235.985810][ C1] ? psi_task_change+0x4f2/0x9d0 [ 235.985813][ C1] dequeue_task_fair+0xad/0x930 [ 235.985816][ C1] deactivate_task+0x114/0x420 [ 235.985819][ C1] __schedule+0x11b1/0x1e70 [ 235.985822][ C1] ? __sched_text_start+0x8/0x8 [ 235.985826][ C1] ? enqueue_hrtimer+0x420/0x420 [ 235.985829][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 235.985833][ C1] ? get_futex_value_locked+0xd6/0x100 [ 235.985835][ C1] schedule+0xdc/0x2b0 [ 235.985839][ C1] futex_wait_queue_me+0x2c4/0x590 [ 235.985842][ C1] ? handle_futex_death.part.0+0x250/0x250 [ 235.985846][ C1] ? lock_pi_update_atomic+0x120/0x120 [ 235.985848][ C1] futex_wait+0x217/0x5d0 [ 235.985852][ C1] ? futex_wait_setup+0x390/0x390 [ 235.985855][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 235.985858][ C1] ? hrtimer_init_sleeper_on_stack+0xa0/0xa0 [ 235.985862][ C1] ? __kasan_check_read+0x11/0x20 [ 235.985865][ C1] ? mark_lock+0xc2/0x1220 [ 235.985868][ C1] ? __kasan_check_read+0x11/0x20 [ 235.985871][ C1] ? mark_lock+0xc2/0x1220 [ 235.985873][ C1] do_futex+0x175/0x1de0 [ 235.985876][ C1] ? __kasan_check_read+0x11/0x20 [ 235.985880][ C1] ? __lock_acquire+0x16f2/0x4a00 [ 235.985883][ C1] ? exit_robust_list+0x2c0/0x2c0 [ 235.985886][ C1] ? __x64_sys_futex+0x4c2/0x590 [ 235.985889][ C1] ? lock_downgrade+0x920/0x920 [ 235.985892][ C1] ? ktime_get+0x100/0x2f0 [ 235.985896][ C1] ? __x64_sys_futex+0x4c2/0x590 [ 235.985899][ C1] ? ktime_get+0x100/0x2f0 [ 235.985902][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 235.985905][ C1] ? trace_hardirqs_on+0x67/0x240 [ 235.985909][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 235.985912][ C1] ? ktime_get+0x1fd/0x2f0 [ 235.985915][ C1] __x64_sys_futex+0x3f7/0x590 [ 235.985918][ C1] ? do_futex+0x1de0/0x1de0 [ 235.985921][ C1] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 235.985924][ C1] ? do_syscall_64+0x26/0x760 [ 235.985928][ C1] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 235.985931][ C1] ? do_syscall_64+0x26/0x760 [ 235.985934][ C1] ? lockdep_hardirqs_on+0x421/0x5e0 [ 235.985937][ C1] ? trace_hardirqs_on+0x67/0x240 [ 235.985940][ C1] do_syscall_64+0xfa/0x760 [ 235.985944][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 235.985947][ C1] RIP: 0033:0x459043 [ 235.985956][ C1] Code: cc cc cc cc cc cc cc 48 8b 7c 24 08 8b 74 24 10 8b 54 24 14 4c 8b 54 24 18 4c 8b 44 24 20 44 8b 4c 24 28 b8 ca 00 00 00 0f 05 <89> 44 24 30 c3 cc cc cc cc cc cc cc cc 8b 7c 24 08 48 8b 74 24 10 [ 235.985959][ C1] RSP: 002b:00007fff708e4a78 EFLAGS: 00000206 ORIG_RAX: 00000000000000ca [ 235.985967][ C1] RAX: ffffffffffffffda RBX: 00000000000186a0 RCX: 0000000000459043 [ 235.985972][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000014e22c8 [ 235.985976][ C1] RBP: 00007fff708e4ac0 R08: 0000000000000000 R09: 0000000000000000 [ 235.985981][ C1] R10: 00007fff708e4ab0 R11: 0000000000000206 R12: 00000000000000a0 [ 235.985985][ C1] R13: 00000000000000ff R14: 00007fb889174000 R15: 0000000000000004 [ 235.986177][ T1077] Kernel panic - not syncing: hung_task: blocked tasks [ 236.424119][ T1077] CPU: 0 PID: 1077 Comm: khungtaskd Not tainted 5.4.0-rc5-next-20191031 #0 [ 236.432690][ T1077] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 236.442723][ T1077] Call Trace: [ 236.446006][ T1077] dump_stack+0x172/0x1f0 [ 236.450319][ T1077] panic+0x2e3/0x75c [ 236.454191][ T1077] ? add_taint.cold+0x16/0x16 [ 236.458848][ T1077] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 236.464549][ T1077] ? printk_safe_flush+0xf2/0x140 [ 236.469552][ T1077] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 236.475786][ T1077] ? nmi_trigger_cpumask_backtrace+0x224/0x28b [ 236.481939][ T1077] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 236.488084][ T1077] watchdog+0xca0/0x1350 [ 236.492326][ T1077] kthread+0x361/0x430 [ 236.496392][ T1077] ? reset_hung_task_detector+0x30/0x30 [ 236.501927][ T1077] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 236.507640][ T1077] ret_from_fork+0x24/0x30 [ 236.513384][ T1077] Kernel Offset: disabled [ 236.517710][ T1077] Rebooting in 86400 seconds..