[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.772737][ T26] audit: type=1800 audit(1568871605.147:25): pid=8599 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.809175][ T26] audit: type=1800 audit(1568871605.147:26): pid=8599 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.845463][ T26] audit: type=1800 audit(1568871605.147:27): pid=8599 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 '10.128.0.164' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 543.611586][ T1053] INFO: task syz-executor623:8754 can't die for more than 143 seconds. [ 543.619998][ T1053] syz-executor623 D26888 8754 8751 0x00004004 [ 543.627645][ T1053] Call Trace: [ 543.631021][ T1053] __schedule+0x828/0x1c20 [ 543.635633][ T1053] ? __sched_text_start+0x8/0x8 [ 543.640489][ T1053] ? lock_downgrade+0x920/0x920 [ 543.645500][ T1053] ? rwlock_bug.part.0+0x90/0x90 [ 543.650448][ T1053] schedule+0xd9/0x260 [ 543.654817][ T1053] schedule_preempt_disabled+0x13/0x20 [ 543.660429][ T1053] __mutex_lock+0x7b0/0x13c0 [ 543.665219][ T1053] ? pipe_wait+0x1ce/0x1f0 [ 543.669642][ T1053] ? mutex_trylock+0x2d0/0x2d0 [ 543.674575][ T1053] ? lock_downgrade+0x920/0x920 [ 543.679448][ T1053] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 543.685566][ T1053] ? finish_wait+0x18c/0x260 [ 543.690391][ T1053] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 543.696463][ T1053] ? lockdep_hardirqs_on+0x421/0x5e0 [ 543.701918][ T1053] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 543.707755][ T1053] mutex_lock_nested+0x16/0x20 [ 543.712764][ T1053] ? mutex_lock_nested+0x16/0x20 [ 543.718545][ T1053] pipe_wait+0x1ce/0x1f0 [ 543.723042][ T1053] ? pipe_double_lock+0x210/0x210 [ 543.728087][ T1053] ? finish_wait+0x260/0x260 [ 543.732875][ T1053] ? copy_page_from_iter+0x5dd/0x810 [ 543.738170][ T1053] ? kill_fasync+0x323/0x4a0 [ 543.742947][ T1053] pipe_write+0x5fa/0xf40 [ 543.747295][ T1053] new_sync_write+0x4d3/0x770 [ 543.753008][ T1053] ? new_sync_read+0x800/0x800 [ 543.757880][ T1053] ? common_file_perm+0x238/0x720 [ 543.763062][ T1053] ? __fget+0x384/0x560 [ 543.767223][ T1053] ? apparmor_file_permission+0x25/0x30 [ 543.772966][ T1053] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 543.779211][ T1053] ? security_file_permission+0x8f/0x380 [ 543.785125][ T1053] __vfs_write+0xe1/0x110 [ 543.789458][ T1053] vfs_write+0x268/0x5d0 [ 543.793868][ T1053] ksys_write+0x14f/0x290 [ 543.798204][ T1053] ? __ia32_sys_read+0xb0/0xb0 [ 543.803119][ T1053] ? do_syscall_64+0x26/0x760 [ 543.807798][ T1053] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 543.814029][ T1053] ? do_syscall_64+0x26/0x760 [ 543.818713][ T1053] __x64_sys_write+0x73/0xb0 [ 543.823458][ T1053] do_syscall_64+0xfa/0x760 [ 543.827966][ T1053] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 543.834013][ T1053] RIP: 0033:0x445909 [ 543.837908][ T1053] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 543.857835][ T1053] RSP: 002b:00007f9271abddb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 543.866388][ T1053] RAX: ffffffffffffffda RBX: 00000000006dac68 RCX: 0000000000445909 [ 543.874536][ T1053] RDX: 00000000fffffc8f RSI: 0000000020000140 RDI: 0000000000000007 [ 543.883611][ T1053] RBP: 00000000006dac60 R08: 0000000000000000 R09: 0000000000000000 [ 543.891817][ T1053] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac6c [ 543.899815][ T1053] R13: 00007ffc2974a61f R14: 00007f9271abe9c0 R15: 20c49ba5e353f7cf [ 543.907994][ T1053] INFO: task syz-executor623:8754 blocked for more than 143 seconds. [ 543.916345][ T1053] Not tainted 5.3.0-next-20190918 #0 [ 543.922282][ T1053] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 543.930946][ T1053] syz-executor623 D26888 8754 8751 0x00004004 [ 543.937465][ T1053] Call Trace: [ 543.940761][ T1053] __schedule+0x828/0x1c20 [ 543.945347][ T1053] ? __sched_text_start+0x8/0x8 [ 543.950209][ T1053] ? lock_downgrade+0x920/0x920 [ 543.955240][ T1053] ? rwlock_bug.part.0+0x90/0x90 [ 543.960192][ T1053] schedule+0xd9/0x260 [ 543.964417][ T1053] schedule_preempt_disabled+0x13/0x20 [ 543.969907][ T1053] __mutex_lock+0x7b0/0x13c0 [ 543.974695][ T1053] ? pipe_wait+0x1ce/0x1f0 [ 543.979135][ T1053] ? mutex_trylock+0x2d0/0x2d0 [ 543.984061][ T1053] ? lock_downgrade+0x920/0x920 [ 543.988914][ T1053] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 543.994896][ T1053] ? finish_wait+0x18c/0x260 [ 543.999488][ T1053] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 544.005459][ T1053] ? lockdep_hardirqs_on+0x421/0x5e0 [ 544.010781][ T1053] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 544.017751][ T1053] mutex_lock_nested+0x16/0x20 [ 544.022735][ T1053] ? mutex_lock_nested+0x16/0x20 [ 544.027680][ T1053] pipe_wait+0x1ce/0x1f0 [ 544.032168][ T1053] ? pipe_double_lock+0x210/0x210 [ 544.037219][ T1053] ? finish_wait+0x260/0x260 [ 544.041968][ T1053] ? copy_page_from_iter+0x5dd/0x810 [ 544.047345][ T1053] ? kill_fasync+0x323/0x4a0 [ 544.052107][ T1053] pipe_write+0x5fa/0xf40 [ 544.056457][ T1053] new_sync_write+0x4d3/0x770 [ 544.061135][ T1053] ? new_sync_read+0x800/0x800 [ 544.066072][ T1053] ? common_file_perm+0x238/0x720 [ 544.071099][ T1053] ? __fget+0x384/0x560 [ 544.075447][ T1053] ? apparmor_file_permission+0x25/0x30 [ 544.080998][ T1053] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.087396][ T1053] ? security_file_permission+0x8f/0x380 [ 544.093185][ T1053] __vfs_write+0xe1/0x110 [ 544.097520][ T1053] vfs_write+0x268/0x5d0 [ 544.101990][ T1053] ksys_write+0x14f/0x290 [ 544.106851][ T1053] ? __ia32_sys_read+0xb0/0xb0 [ 544.111793][ T1053] ? do_syscall_64+0x26/0x760 [ 544.116471][ T1053] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 544.122686][ T1053] ? do_syscall_64+0x26/0x760 [ 544.127373][ T1053] __x64_sys_write+0x73/0xb0 [ 544.132147][ T1053] do_syscall_64+0xfa/0x760 [ 544.136674][ T1053] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 544.143578][ T1053] RIP: 0033:0x445909 [ 544.147485][ T1053] Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd [ 544.167371][ T1053] RSP: 002b:00007f9271abddb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 544.175961][ T1053] RAX: ffffffffffffffda RBX: 00000000006dac68 RCX: 0000000000445909 [ 544.184273][ T1053] RDX: 00000000fffffc8f RSI: 0000000020000140 RDI: 0000000000000007 [ 544.192467][ T1053] RBP: 00000000006dac60 R08: 0000000000000000 R09: 0000000000000000 [ 544.200528][ T1053] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac6c [ 544.208685][ T1053] R13: 00007ffc2974a61f R14: 00007f9271abe9c0 R15: 20c49ba5e353f7cf [ 544.216895][ T1053] INFO: task syz-executor623:8755 can't die for more than 143 seconds. [ 544.225304][ T1053] syz-executor623 R running task 24984 8755 8751 0x00004006 [ 544.233355][ T1053] Call Trace: [ 544.236660][ T1053] ? mark_held_locks+0xa4/0xf0 [ 544.241592][ T1053] ? __sched_text_start+0x8/0x8 [ 544.246529][ T1053] ? retint_kernel+0x2b/0x2b [ 544.251115][ T1053] ? trace_hardirqs_on_caller+0x6a/0x240 [ 544.257012][ T1053] ? lockdep_hardirqs_on+0x421/0x5e0 [ 544.262463][ T1053] ? trace_hardirqs_on+0x67/0x240 [ 544.267493][ T1053] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 544.274023][ T1053] ? preempt_schedule_irq+0xf3/0x160 [ 544.279315][ T1053] ? retint_kernel+0x2b/0x2b [ 544.284085][ T1053] ? bget_one+0x30/0x30 [ 544.288249][ T1053] ? iov_iter_alignment+0x5e8/0x830 [ 544.293606][ T1053] ? iov_iter_alignment+0x375/0x830 [ 544.298809][ T1053] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.305235][ T1053] ? iov_iter_alignment+0x34d/0x830 [ 544.310441][ T1053] ? do_blockdev_direct_IO+0x1dd/0x8420 [ 544.316149][ T1053] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 544.322466][ T1053] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 544.328457][ T1053] ? bget_one+0x30/0x30 [ 544.332784][ T1053] ? ext4_dio_get_block_unwritten_sync+0x110/0x110 [ 544.339289][ T1053] ? attach_entity_load_avg+0x682/0x8a0 [ 544.345007][ T1053] ? sb_init_dio_done_wq+0x80/0x80 [ 544.350124][ T1053] ? __kasan_check_read+0x11/0x20 [ 544.355383][ T1053] ? __lock_acquire+0x16f2/0x4a00 [ 544.360526][ T1053] ? lock_downgrade+0x920/0x920 [ 544.365757][ T1053] ? ext4_dio_get_block_unwritten_sync+0x110/0x110 [ 544.372406][ T1053] ? __blockdev_direct_IO+0xa1/0xca [ 544.377619][ T1053] ? __blockdev_direct_IO+0xa1/0xca [ 544.382992][ T1053] ? bget_one+0x30/0x30 [ 544.387159][ T1053] ? ext4_direct_IO+0xd60/0x1c30 [ 544.392297][ T1053] ? ext4_dio_get_block_unwritten_sync+0x110/0x110 [ 544.398908][ T1053] ? generic_file_direct_write+0x20a/0x4a0 [ 544.405767][ T1053] ? __generic_file_write_iter+0x2ee/0x630 [ 544.411809][ T1053] ? ext4_file_write_iter+0x317/0x13c0 [ 544.417298][ T1053] ? ext4_release_file+0x380/0x380 [ 544.422604][ T1053] ? mutex_trylock+0x2d0/0x2d0 [ 544.427378][ T1053] ? __schedule+0x830/0x1c20 [ 544.432137][ T1053] ? do_iter_readv_writev+0x5f8/0x8f0 [ 544.437527][ T1053] ? common_file_perm+0x238/0x720 [ 544.442904][ T1053] ? no_seek_end_llseek_size+0x70/0x70 [ 544.448375][ T1053] ? apparmor_file_permission+0x25/0x30 [ 544.454209][ T1053] ? rw_verify_area+0x126/0x360 [ 544.459157][ T1053] ? do_iter_write+0x184/0x610 [ 544.464125][ T1053] ? kill_fasync+0x323/0x4a0 [ 544.468728][ T1053] ? vfs_iter_write+0x77/0xb0 [ 544.473575][ T1053] ? iter_file_splice_write+0x66d/0xbe0 [ 544.479161][ T1053] ? page_cache_pipe_buf_release+0x180/0x180 [ 544.485340][ T1053] ? rcu_read_lock_any_held+0xcd/0xf0 [ 544.490723][ T1053] ? __this_cpu_preempt_check+0x3a/0x210 [ 544.496524][ T1053] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.502947][ T1053] ? __sb_start_write+0x1e5/0x460 [ 544.507991][ T1053] ? page_cache_pipe_buf_release+0x180/0x180 [ 544.514130][ T1053] ? do_splice+0x785/0x1540 [ 544.518638][ T1053] ? ksys_dup3+0x3e0/0x3e0 [ 544.523274][ T1053] ? opipe_prep.part.0+0x2e0/0x2e0 [ 544.528392][ T1053] ? __fget_light+0x1a9/0x230 [ 544.534142][ T1053] ? __x64_sys_splice+0x2c6/0x330 [ 544.539178][ T1053] ? do_syscall_64+0xfa/0x760 [ 544.544049][ T1053] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 544.550130][ T1053] [ 544.550130][ T1053] Showing all locks held in the system: [ 544.558009][ T1053] 1 lock held by khungtaskd/1053: [ 544.563187][ T1053] #0: ffffffff88fa9e80 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 544.572715][ T1053] 3 locks held by rs:main Q:Reg/8635: [ 544.578077][ T1053] #0: ffff8880ae8348d8 (&rq->lock){-.-.}, at: __schedule+0x269/0x1c20 [ 544.586542][ T1053] #1: ffff888215ea0420 (sb_writers#3){.+.+}, at: vfs_write+0x485/0x5d0 [ 544.595026][ T1053] #2: ffff8880a29e44c8 (&sb->s_type->i_mutex_key#11){+.+.}, at: ext4_file_write_iter+0x220/0x13c0 [ 544.605989][ T1053] 1 lock held by rsyslogd/8637: [ 544.610829][ T1053] #0: ffff888095eac360 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 544.619705][ T1053] 2 locks held by getty/8727: [ 544.624532][ T1053] #0: ffff8880a16fa090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.633668][ T1053] #1: ffffc90005f1d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.643415][ T1053] 2 locks held by getty/8728: [ 544.648086][ T1053] #0: ffff8880a2fbc090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.657234][ T1053] #1: ffffc90005f2d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.667822][ T1053] 2 locks held by getty/8729: [ 544.672642][ T1053] #0: ffff888099709090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.681766][ T1053] #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.692093][ T1053] 2 locks held by getty/8730: [ 544.696760][ T1053] #0: ffff888097c40090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.705978][ T1053] #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.715703][ T1053] 2 locks held by getty/8731: [ 544.720374][ T1053] #0: ffff888092f46090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.729611][ T1053] #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.742334][ T1053] 2 locks held by getty/8732: [ 544.747057][ T1053] #0: ffff8880a1ee2090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.756216][ T1053] #1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.765958][ T1053] 2 locks held by getty/8733: [ 544.770647][ T1053] #0: ffff88809259e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 544.779775][ T1053] #1: ffffc90005ef92e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 544.789622][ T1053] 1 lock held by syz-executor623/8754: [ 544.796071][ T1053] #0: ffff8880a9010c60 (&pipe->mutex/1){+.+.}, at: pipe_wait+0x1ce/0x1f0 [ 544.804942][ T1053] 3 locks held by syz-executor623/8755: [ 544.810479][ T1053] [ 544.812972][ T1053] ============================================= [ 544.812972][ T1053] [ 544.821536][ T1053] NMI backtrace for cpu 1 [ 544.825872][ T1053] CPU: 1 PID: 1053 Comm: khungtaskd Not tainted 5.3.0-next-20190918 #0 [ 544.834100][ T1053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 544.844145][ T1053] Call Trace: [ 544.847530][ T1053] dump_stack+0x172/0x1f0 [ 544.851862][ T1053] nmi_cpu_backtrace.cold+0x70/0xb2 [ 544.857058][ T1053] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.863298][ T1053] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 544.868958][ T1053] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 544.874943][ T1053] arch_trigger_cpumask_backtrace+0x14/0x20 [ 544.880835][ T1053] watchdog+0xc99/0x1360 [ 544.885263][ T1053] kthread+0x361/0x430 [ 544.889334][ T1053] ? reset_hung_task_detector+0x30/0x30 [ 544.894877][ T1053] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 544.901410][ T1053] ret_from_fork+0x24/0x30 [ 544.905955][ T1053] Sending NMI from CPU 1 to CPUs 0: [ 544.911912][ C0] NMI backtrace for cpu 0 [ 544.911918][ C0] CPU: 0 PID: 8755 Comm: syz-executor623 Not tainted 5.3.0-next-20190918 #0 [ 544.911924][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 544.911928][ C0] RIP: 0010:write_comp_data+0x1e/0x70 [ 544.911939][ C0] Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 38 28 8f 7e a9 00 01 1f 00 75 51 41 8b 80 00 13 00 00 <83> f8 03 75 45 49 8b 80 08 13 00 00 45 8b 80 04 13 00 00 4c 8b 08 [ 544.911942][ C0] RSP: 0018:ffff88809497f350 EFLAGS: 00000246 [ 544.911950][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff83402d29 [ 544.911954][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 544.911959][ C0] RBP: ffff88809497f358 R08: ffff88808d88e4c0 R09: ffffffff81f9dca0 [ 544.911964][ C0] R10: ffff88809497f730 R11: ffff888095581297 R12: 0000000000000000 [ 544.911969][ C0] R13: 000000000000f000 R14: 0000000000000000 R15: 0000000000000000 [ 544.911974][ C0] FS: 00007f9271a9d700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 544.911978][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 544.911983][ C0] CR2: ffffffffff600400 CR3: 000000008db14000 CR4: 00000000001406f0 [ 544.911988][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 544.911992][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 544.911995][ C0] Call Trace: [ 544.911998][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.912002][ C0] iov_iter_alignment+0x5d9/0x830 [ 544.912005][ C0] do_blockdev_direct_IO+0x1dd/0x8420 [ 544.912009][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 544.912013][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 544.912016][ C0] ? bget_one+0x30/0x30 [ 544.912020][ C0] ? ext4_dio_get_block_unwritten_sync+0x110/0x110 [ 544.912023][ C0] ? attach_entity_load_avg+0x682/0x8a0 [ 544.912027][ C0] ? sb_init_dio_done_wq+0x80/0x80 [ 544.912030][ C0] ? __kasan_check_read+0x11/0x20 [ 544.912033][ C0] ? __lock_acquire+0x16f2/0x4a00 [ 544.912036][ C0] ? lock_downgrade+0x920/0x920 [ 544.912040][ C0] ? ext4_dio_get_block_unwritten_sync+0x110/0x110 [ 544.912043][ C0] __blockdev_direct_IO+0xa1/0xca [ 544.912047][ C0] ? __blockdev_direct_IO+0xa1/0xca [ 544.912050][ C0] ? bget_one+0x30/0x30 [ 544.912053][ C0] ext4_direct_IO+0xd60/0x1c30 [ 544.912057][ C0] ? ext4_dio_get_block_unwritten_sync+0x110/0x110 [ 544.912060][ C0] generic_file_direct_write+0x20a/0x4a0 [ 544.912064][ C0] __generic_file_write_iter+0x2ee/0x630 [ 544.912067][ C0] ext4_file_write_iter+0x317/0x13c0 [ 544.912075][ C0] ? ext4_release_file+0x380/0x380 [ 544.912079][ C0] ? mutex_trylock+0x2d0/0x2d0 [ 544.912082][ C0] ? __schedule+0x830/0x1c20 [ 544.912085][ C0] do_iter_readv_writev+0x5f8/0x8f0 [ 544.912089][ C0] ? common_file_perm+0x238/0x720 [ 544.912092][ C0] ? no_seek_end_llseek_size+0x70/0x70 [ 544.912096][ C0] ? apparmor_file_permission+0x25/0x30 [ 544.912099][ C0] ? rw_verify_area+0x126/0x360 [ 544.912102][ C0] do_iter_write+0x184/0x610 [ 544.912105][ C0] ? kill_fasync+0x323/0x4a0 [ 544.912108][ C0] vfs_iter_write+0x77/0xb0 [ 544.912111][ C0] iter_file_splice_write+0x66d/0xbe0 [ 544.912115][ C0] ? page_cache_pipe_buf_release+0x180/0x180 [ 544.912118][ C0] ? rcu_read_lock_any_held+0xcd/0xf0 [ 544.912122][ C0] ? __this_cpu_preempt_check+0x3a/0x210 [ 544.912126][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 544.912129][ C0] ? __sb_start_write+0x1e5/0x460 [ 544.912133][ C0] ? page_cache_pipe_buf_release+0x180/0x180 [ 544.912135][ C0] do_splice+0x785/0x1540 [ 544.912138][ C0] ? ksys_dup3+0x3e0/0x3e0 [ 544.912142][ C0] ? opipe_prep.part.0+0x2e0/0x2e0 [ 544.912145][ C0] ? __fget_light+0x1a9/0x230 [ 544.912148][ C0] __x64_sys_splice+0x2c6/0x330 [ 544.912151][ C0] do_syscall_64+0xfa/0x760 [ 544.912155][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 544.912158][ C0] RIP: 0033:0x445909 [ 544.912167][ C0] Code: e8 bc b7 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 544.912171][ C0] RSP: 002b:00007f9271a9cda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 544.912178][ C0] RAX: ffffffffffffffda RBX: 00000000006dac78 RCX: 0000000000445909 [ 544.912183][ C0] RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000006 [ 544.912187][ C0] RBP: 00000000006dac70 R08: 000100000000ffe0 R09: 0000000000000000 [ 544.912192][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac7c [ 544.912196][ C0] R13: 00007ffc2974a61f R14: 00007f9271a9d9c0 R15: 20c49ba5e353f7cf [ 544.913405][ T1053] Kernel panic - not syncing: hung_task: blocked tasks [ 545.369144][ T1053] CPU: 1 PID: 1053 Comm: khungtaskd Not tainted 5.3.0-next-20190918 #0 [ 545.377369][ T1053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 545.387414][ T1053] Call Trace: [ 545.390709][ T1053] dump_stack+0x172/0x1f0 [ 545.395301][ T1053] panic+0x2dc/0x755 [ 545.399275][ T1053] ? add_taint.cold+0x16/0x16 [ 545.403957][ T1053] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 545.409595][ T1053] ? ___preempt_schedule+0x16/0x20 [ 545.414797][ T1053] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 545.420946][ T1053] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 545.427118][ T1053] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 545.433271][ T1053] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 545.439428][ T1053] watchdog+0xcaa/0x1360 [ 545.443677][ T1053] kthread+0x361/0x430 [ 545.447745][ T1053] ? reset_hung_task_detector+0x30/0x30 [ 545.453295][ T1053] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 545.459536][ T1053] ret_from_fork+0x24/0x30 [ 545.466140][ T1053] Kernel Offset: disabled [ 545.470492][ T1053] Rebooting in 86400 seconds..