[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.362210] audit: type=1800 audit(1538747282.535:25): pid=5669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.388355] audit: type=1800 audit(1538747282.545:26): pid=5669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.412233] audit: type=1800 audit(1538747282.545:27): pid=5669 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 '10.128.0.115' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 585.594702] INFO: task jbd2/sda1-8:3078 blocked for more than 140 seconds. [ 585.601866] Not tainted 4.19.0-rc6+ #129 [ 585.607180] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 585.615285] jbd2/sda1-8 D18448 3078 2 0x80000000 [ 585.620998] Call Trace: [ 585.624301] __schedule+0x86c/0x1ed0 [ 585.628047] ? __sched_text_start+0x8/0x8 [ 585.632290] ? prepare_to_wait+0x1b3/0x3f0 [ 585.636754] ? lock_downgrade+0x900/0x900 [ 585.640974] ? trace_hardirqs_on+0xbd/0x310 [ 585.645467] ? kasan_check_read+0x11/0x20 [ 585.649630] ? prepare_to_wait+0x1b3/0x3f0 [ 585.654411] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 585.659875] ? kasan_check_write+0x14/0x20 [ 585.664230] ? do_raw_spin_lock+0xc1/0x200 [ 585.668483] schedule+0xfe/0x460 [ 585.671854] ? lock_downgrade+0x900/0x900 [ 585.676160] ? __schedule+0x1ed0/0x1ed0 [ 585.680147] ? kasan_check_read+0x11/0x20 [ 585.684440] ? do_raw_spin_unlock+0xa7/0x2f0 [ 585.688858] ? do_raw_write_trylock+0x1c0/0x1c0 [ 585.694095] ? kasan_check_write+0x14/0x20 [ 585.698589] ? do_raw_spin_lock+0xc1/0x200 [ 585.702922] jbd2_journal_commit_transaction+0xd42/0x89f8 [ 585.708664] ? journal_submit_commit_record+0xb60/0xb60 [ 585.714155] ? mark_held_locks+0x130/0x130 [ 585.718408] ? __update_load_avg_blocked_se+0x730/0x730 [ 585.723918] ? __update_load_avg_se+0xb90/0xb90 [ 585.728672] ? update_load_avg+0x387/0x2470 [ 585.733010] ? finish_wait+0x430/0x430 [ 585.737100] ? do_raw_spin_unlock+0xa7/0x2f0 [ 585.741528] ? trace_hardirqs_on+0x310/0x310 [ 585.746492] ? mark_held_locks+0x130/0x130 [ 585.750821] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 585.756792] ? update_curr+0x4cf/0xbe0 [ 585.760693] ? lock_downgrade+0x900/0x900 [ 585.765057] ? check_preemption_disabled+0x48/0x200 [ 585.770181] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 585.776146] ? cpuacct_charge+0x282/0x440 [ 585.780302] ? cpuacct_css_alloc+0x160/0x160 [ 585.784834] ? do_raw_spin_unlock+0xa7/0x2f0 [ 585.789253] ? trace_hardirqs_on+0x310/0x310 [ 585.793815] ? mark_held_locks+0x130/0x130 [ 585.798057] ? update_curr+0x4ec/0xbe0 [ 585.801949] ? __account_cfs_rq_runtime+0x790/0x790 [ 585.807578] ? mark_held_locks+0x130/0x130 [ 585.811823] ? reweight_entity+0x10f0/0x10f0 [ 585.816447] ? pick_next_task_fair+0xbad/0x17c0 [ 585.821134] ? lock_downgrade+0x900/0x900 [ 585.825444] ? dequeue_entity+0x3f4/0x1770 [ 585.829695] ? lock_is_held_type+0x210/0x210 [ 585.834263] ? pick_next_task_fair+0x659/0x17c0 [ 585.838948] ? __update_idle_core+0x2f7/0x600 [ 585.843633] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 585.849525] ? finish_task_switch+0x1f5/0x900 [ 585.854248] ? mark_held_locks+0x130/0x130 [ 585.858505] ? trace_hardirqs_on+0xbd/0x310 [ 585.862830] ? kasan_check_read+0x11/0x20 [ 585.867169] ? finish_task_switch+0x1f5/0x900 [ 585.871683] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 585.877856] ? compat_start_thread+0x80/0x80 [ 585.882282] ? cpu_load_update_active+0x2c0/0x2c0 [ 585.887364] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 585.892930] ? mark_held_locks+0x130/0x130 [ 585.897381] ? mark_held_locks+0x130/0x130 [ 585.901636] ? kasan_check_write+0x14/0x20 [ 585.906028] ? finish_task_switch+0x2f5/0x900 [ 585.910615] ? __switch_to_asm+0x40/0x70 [ 585.914878] ? preempt_notifier_register+0x200/0x200 [ 585.919998] ? __switch_to_asm+0x34/0x70 [ 585.924220] ? __switch_to_asm+0x34/0x70 [ 585.928290] ? __switch_to_asm+0x40/0x70 [ 585.932363] ? __switch_to_asm+0x34/0x70 [ 585.936648] ? __switch_to_asm+0x40/0x70 [ 585.940722] ? __switch_to_asm+0x34/0x70 [ 585.944968] ? __switch_to_asm+0x40/0x70 [ 585.949037] ? __switch_to_asm+0x34/0x70 [ 585.953106] ? __switch_to_asm+0x34/0x70 [ 585.957796] ? __switch_to_asm+0x40/0x70 [ 585.961856] ? __switch_to_asm+0x34/0x70 [ 585.966088] ? __switch_to_asm+0x40/0x70 [ 585.970159] ? __switch_to_asm+0x34/0x70 [ 585.974436] ? __switch_to_asm+0x40/0x70 [ 585.978515] ? __schedule+0x874/0x1ed0 [ 585.982414] ? lock_acquire+0x1ed/0x520 [ 585.986570] ? lock_timer_base+0xbb/0x2b0 [ 585.990735] ? lock_release+0x970/0x970 [ 585.994855] ? trace_hardirqs_off+0xb8/0x310 [ 585.999274] ? debug_object_assert_init+0x368/0x4b0 [ 586.004445] ? lock_timer_base+0xbb/0x2b0 [ 586.008604] ? trace_hardirqs_on+0x310/0x310 [ 586.013092] ? try_to_del_timer_sync+0xec/0x140 [ 586.017971] ? lock_downgrade+0x900/0x900 [ 586.022131] ? init_timer_key+0x480/0x480 [ 586.026412] ? _raw_spin_lock_irqsave+0xa1/0xd0 [ 586.031091] ? trace_hardirqs_on+0xbd/0x310 [ 586.035563] ? kasan_check_read+0x11/0x20 [ 586.039722] ? try_to_del_timer_sync+0xec/0x140 [ 586.044920] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 586.050381] ? stub_timer+0x10/0x10 [ 586.054151] ? lock_downgrade+0x900/0x900 [ 586.058326] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 586.063545] ? try_to_del_timer_sync+0xec/0x140 [ 586.068224] ? del_timer+0x150/0x150 [ 586.071949] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.077676] kjournald2+0x26d/0xb30 [ 586.081333] ? __bpf_trace_jbd2_end_commit+0x30/0x30 [ 586.086676] ? __kthread_parkme+0xce/0x1a0 [ 586.090926] ? lock_downgrade+0x900/0x900 [ 586.095247] ? trace_hardirqs_on+0xbd/0x310 [ 586.099579] ? finish_wait+0x430/0x430 [ 586.103589] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 586.109054] ? kasan_check_write+0x14/0x20 [ 586.113569] ? do_raw_spin_lock+0xc1/0x200 [ 586.117821] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 586.122932] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 586.128667] ? __kthread_parkme+0xfb/0x1a0 [ 586.132919] kthread+0x35a/0x420 [ 586.136498] ? __bpf_trace_jbd2_end_commit+0x30/0x30 [ 586.141610] ? kthread_bind+0x40/0x40 [ 586.145970] ret_from_fork+0x3a/0x50 [ 586.149768] INFO: lockdep is turned off. [ 586.154074] NMI backtrace for cpu 0 [ 586.157740] CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc6+ #129 [ 586.164667] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 586.174024] Call Trace: [ 586.176710] dump_stack+0x1c4/0x2b4 [ 586.180353] ? dump_stack_print_info.cold.2+0x52/0x52 [ 586.185556] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.191105] nmi_cpu_backtrace.cold.3+0x63/0xa2 [ 586.195840] ? lapic_can_unplug_cpu.cold.27+0x3f/0x3f [ 586.201038] nmi_trigger_cpumask_backtrace+0x1b3/0x1ed [ 586.206336] arch_trigger_cpumask_backtrace+0x14/0x20 [ 586.211534] watchdog+0xb3e/0x1050 [ 586.215082] ? reset_hung_task_detector+0xd0/0xd0 [ 586.219930] ? __kthread_parkme+0xce/0x1a0 [ 586.224168] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 586.229273] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 586.234410] ? lockdep_hardirqs_on+0x421/0x5c0 [ 586.239270] ? trace_hardirqs_on+0xbd/0x310 [ 586.243589] ? kasan_check_read+0x11/0x20 [ 586.247751] ? __kthread_parkme+0xce/0x1a0 [ 586.251986] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 586.257441] ? kasan_check_write+0x14/0x20 [ 586.261680] ? do_raw_spin_lock+0xc1/0x200 [ 586.265924] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 586.271043] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 586.276593] ? __kthread_parkme+0xfb/0x1a0 [ 586.280837] kthread+0x35a/0x420 [ 586.284208] ? reset_hung_task_detector+0xd0/0xd0 [ 586.289059] ? kthread_bind+0x40/0x40 [ 586.292871] ret_from_fork+0x3a/0x50 [ 586.296732] Sending NMI from CPU 0 to CPUs 1: [ 586.302826] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.564 msecs [ 586.303240] NMI backtrace for cpu 1 [ 586.303247] CPU: 1 PID: 5821 Comm: syz-executor250 Not tainted 4.19.0-rc6+ #129 [ 586.303255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 586.303260] RIP: 0010:__sanitizer_cov_trace_pc+0x26/0x50 [ 586.303274] Code: 5d c3 66 90 55 48 89 e5 65 48 8b 04 25 40 ee 01 00 65 8b 15 3c 38 83 7e 81 e2 00 01 1f 00 48 8b 75 08 75 2b 8b 90 d0 12 00 00 <83> fa 02 75 20 48 8b 88 d8 12 00 00 8b 80 d4 12 00 00 48 8b 11 48 [ 586.303279] RSP: 0018:ffff8801d758f178 EFLAGS: 00000246 [ 586.303288] RAX: ffff8801d7818040 RBX: ffff8801d41bf188 RCX: ffffffff82110513 [ 586.303294] RDX: 0000000000000000 RSI: ffffffff8211051d RDI: 0000000000000004 [ 586.303300] RBP: ffff8801d758f178 R08: ffff8801d7818040 R09: ffffed0037270221 [ 586.303316] R10: ffffed0037270221 R11: ffff8801b938110b R12: 0000000000000002 [ 586.303323] R13: ffff8801b93810a8 R14: 0000000000000001 R15: dffffc0000000000 [ 586.303329] FS: 0000000001cb2880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 586.303334] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 586.303340] CR2: ffffffffff600400 CR3: 00000001d7646000 CR4: 00000000001406e0 [ 586.303346] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 586.303352] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 586.303355] Call Trace: [ 586.303360] ext4_ext_drop_refs+0xbd/0xf0 [ 586.303365] mext_check_coverage.constprop.13+0x27b/0x510 [ 586.303369] ? mext_page_mkuptodate+0x12b0/0x12b0 [ 586.303374] ext4_move_extents+0x2784/0x3c20 [ 586.303379] ? ext4_double_up_write_data_sem+0x30/0x30 [ 586.303383] ? jbd2_journal_stop+0x430/0x15d0 [ 586.303393] ? kmem_cache_free+0x21a/0x290 [ 586.303397] ? jbd2_journal_stop+0x234/0x15d0 [ 586.303402] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.303407] ? ext4_reserve_inode_write+0x148/0x260 [ 586.303411] ? ext4_mark_inode_dirty+0x26f/0xb30 [ 586.303416] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 586.303421] ? ext4_alloc_file_blocks+0x50b/0xaf0 [ 586.303425] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 586.303430] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 586.303434] ? ktime_get_coarse_real_ts64+0x243/0x3b0 [ 586.303439] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.303443] ? inode_init_owner+0x340/0x340 [ 586.303448] ? current_time+0x131/0x1b0 [ 586.303452] ? lock_acquire+0x1ed/0x520 [ 586.303456] ? mnt_want_write_file+0x68/0x110 [ 586.303460] ? lock_release+0x970/0x970 [ 586.303464] ? arch_local_save_flags+0x40/0x40 [ 586.303468] ? fget_raw+0x20/0x20 [ 586.303472] ? lock_release+0x970/0x970 [ 586.303476] ? arch_local_save_flags+0x40/0x40 [ 586.303481] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.303485] ? check_preemption_disabled+0x48/0x200 [ 586.303489] ? preempt_count_add+0x7d/0x160 [ 586.303494] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.303498] ? __mnt_want_write_file+0xa2/0xc0 [ 586.303502] ext4_ioctl+0x3154/0x4210 [ 586.303506] ? aa_path_link+0x5e0/0x5e0 [ 586.303510] ? ext4_ioctl_group_add+0x560/0x560 [ 586.303514] ? generic_write_checks+0x382/0x5d0 [ 586.303519] ? ext4_insert_range+0x1410/0x1410 [ 586.303524] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 586.303528] ? __generic_file_write_iter+0x1bd/0x630 [ 586.303532] ? vfs_fallocate+0x7ab/0x940 [ 586.303536] ? lock_downgrade+0x900/0x900 [ 586.303541] ? arch_local_save_flags+0x40/0x40 [ 586.303545] ? fsnotify_first_mark+0x350/0x350 [ 586.303549] ? arch_local_save_flags+0x40/0x40 [ 586.303553] ? fsnotify+0x12f0/0x12f0 [ 586.303558] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.303563] ? check_preemption_disabled+0x48/0x200 [ 586.303567] ? __sb_end_write+0xd9/0x110 [ 586.303571] ? vfs_fallocate+0x548/0x940 [ 586.303575] ? ioctl_preallocate+0x145/0x300 [ 586.303579] ? ioctl_file_clone+0x2c0/0x2c0 [ 586.303583] ? vfs_write+0x2f3/0x560 [ 586.303587] ? ext4_ioctl_group_add+0x560/0x560 [ 586.303591] do_vfs_ioctl+0x1de/0x1720 [ 586.303595] ? fsnotify_first_mark+0x350/0x350 [ 586.303600] ? __fsnotify_parent+0xcc/0x420 [ 586.303604] ? ioctl_preallocate+0x300/0x300 [ 586.303609] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 586.303613] ? __fget_light+0x2e9/0x430 [ 586.303617] ? fget_raw+0x20/0x20 [ 586.303621] ? __sb_end_write+0xd9/0x110 [ 586.303625] ? ksys_write+0x1ae/0x260 [ 586.303629] ? security_file_ioctl+0x94/0xc0 [ 586.303633] ksys_ioctl+0xa9/0xd0 [ 586.303636] __x64_sys_ioctl+0x73/0xb0 [ 586.303640] do_syscall_64+0x1b9/0x820 [ 586.303645] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 586.303650] ? syscall_return_slowpath+0x5e0/0x5e0 [ 586.303655] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 586.303660] ? trace_hardirqs_on_caller+0x310/0x310 [ 586.303664] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 586.303669] ? prepare_exit_to_usermode+0x291/0x3b0 [ 586.303673] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 586.303678] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 586.303681] RIP: 0033:0x4402b9 [ 586.303694] 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 [ 586.303699] RSP: 002b:00007ffe13c9aa48 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 586.303709] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402b9 [ 586.303715] RDX: 0000000020000300 RSI: 00000000c028660f RDI: 0000000000000003 [ 586.303721] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 586.303727] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401b40 [ 586.303733] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 586.305493] Kernel panic - not syncing: hung_task: blocked tasks [ 586.847497] CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc6+ #129 [ 586.854523] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 586.866010] Call Trace: [ 586.869202] dump_stack+0x1c4/0x2b4 [ 586.872815] ? dump_stack_print_info.cold.2+0x52/0x52 [ 586.878063] panic+0x238/0x4e7 [ 586.881247] ? add_taint.cold.5+0x16/0x16 [ 586.886281] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 586.892370] ? nmi_trigger_cpumask_backtrace+0x1c4/0x1ed [ 586.897873] ? nmi_trigger_cpumask_backtrace+0x173/0x1ed [ 586.903338] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 586.908837] watchdog+0xb4f/0x1050 [ 586.912378] ? reset_hung_task_detector+0xd0/0xd0 [ 586.917208] ? __kthread_parkme+0xce/0x1a0 [ 586.921438] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 586.926533] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 586.931798] ? lockdep_hardirqs_on+0x421/0x5c0 [ 586.936430] ? trace_hardirqs_on+0xbd/0x310 [ 586.940751] ? kasan_check_read+0x11/0x20 [ 586.944882] ? __kthread_parkme+0xce/0x1a0 [ 586.949101] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 586.954595] ? kasan_check_write+0x14/0x20 [ 586.958821] ? do_raw_spin_lock+0xc1/0x200 [ 586.963046] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 586.968302] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 586.973850] ? __kthread_parkme+0xfb/0x1a0 [ 586.978077] kthread+0x35a/0x420 [ 586.981430] ? reset_hung_task_detector+0xd0/0xd0 [ 586.986255] ? kthread_bind+0x40/0x40 [ 586.990150] ret_from_fork+0x3a/0x50 [ 586.995211] Kernel Offset: disabled [ 587.000271] Rebooting in 86400 seconds..