[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.624106] audit: type=1800 audit(1538747709.262:25): pid=5665 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 37.643312] audit: type=1800 audit(1538747709.262:26): pid=5665 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.663151] audit: type=1800 audit(1538747709.262:27): pid=5665 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 '10.128.0.125' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 567.712998] INFO: task jbd2/sda1-8:3078 blocked for more than 140 seconds. [ 567.720167] Not tainted 4.19.0-rc6+ #268 [ 567.725096] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 567.733138] jbd2/sda1-8 D18256 3078 2 0x80000000 [ 567.738818] Call Trace: [ 567.741529] __schedule+0x86c/0x1ed0 [ 567.745527] ? trace_hardirqs_off+0xb8/0x310 [ 567.750035] ? kasan_check_read+0x11/0x20 [ 567.754261] ? __sched_text_start+0x8/0x8 [ 567.758436] ? prepare_to_wait+0x1b3/0x3f0 [ 567.762682] ? lock_downgrade+0x900/0x900 [ 567.766982] ? trace_hardirqs_on+0xbd/0x310 [ 567.771299] ? kasan_check_read+0x11/0x20 [ 567.775522] ? prepare_to_wait+0x1b3/0x3f0 [ 567.779761] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 567.785282] ? kasan_check_write+0x14/0x20 [ 567.789520] ? do_raw_spin_lock+0xc1/0x200 [ 567.793884] schedule+0xfe/0x460 [ 567.797254] ? lock_downgrade+0x900/0x900 [ 567.801517] ? __schedule+0x1ed0/0x1ed0 [ 567.805630] ? kasan_check_read+0x11/0x20 [ 567.809784] ? do_raw_spin_unlock+0xa7/0x2f0 [ 567.814288] ? do_raw_write_trylock+0x1c0/0x1c0 [ 567.818951] ? kasan_check_write+0x14/0x20 [ 567.823293] ? do_raw_spin_lock+0xc1/0x200 [ 567.827681] jbd2_journal_commit_transaction+0xd42/0x89f8 [ 567.833403] ? update_group_capacity+0x1060/0x1060 [ 567.838405] ? mark_held_locks+0x130/0x130 [ 567.842640] ? journal_submit_commit_record+0xb60/0xb60 [ 567.848141] ? mark_held_locks+0x130/0x130 [ 567.852385] ? __update_load_avg_blocked_se+0x730/0x730 [ 567.858075] ? __update_load_avg_se+0xb90/0xb90 [ 567.862769] ? find_busiest_group+0x100/0x1d20 [ 567.867518] ? get_page_from_freelist+0x16db/0x5340 [ 567.872535] ? update_sd_lb_stats+0x2a40/0x2a40 [ 567.877365] ? finish_wait+0x430/0x430 [ 567.881260] ? do_raw_spin_unlock+0xa7/0x2f0 [ 567.885781] ? trace_hardirqs_on+0x310/0x310 [ 567.890189] ? lock_repin_lock+0x430/0x430 [ 567.894579] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 567.899661] ? find_next_and_bit+0x183/0x1e0 [ 567.904161] ? mark_held_locks+0x130/0x130 [ 567.908388] ? load_balance+0x6dd/0x3430 [ 567.912494] ? rq_online_fair+0x4d0/0x4d0 [ 567.916769] ? find_busiest_group+0x1d20/0x1d20 [ 567.921436] ? cpuacct_charge+0x282/0x440 [ 567.925703] ? cpuacct_css_alloc+0x160/0x160 [ 567.930118] ? do_raw_spin_unlock+0xa7/0x2f0 [ 567.934775] ? trace_hardirqs_on+0x310/0x310 [ 567.939186] ? mark_held_locks+0x130/0x130 [ 567.943540] ? mark_held_locks+0x130/0x130 [ 567.947768] ? reweight_entity+0x10f0/0x10f0 [ 567.952174] ? lock_acquire+0x1ed/0x520 [ 567.956275] ? pick_next_task_fair+0x1122/0x17c0 [ 567.961034] ? lock_release+0x970/0x970 [ 567.965165] ? lock_release+0x970/0x970 [ 567.969136] ? lock_is_held_type+0x210/0x210 [ 567.973625] ? kasan_check_write+0x14/0x20 [ 567.977853] ? do_raw_spin_lock+0xc1/0x200 [ 567.982084] ? pick_next_task_fair+0x659/0x17c0 [ 567.987085] ? __update_idle_core+0x2f7/0x600 [ 567.991669] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 567.997666] ? finish_task_switch+0x1f5/0x900 [ 568.002163] ? mark_held_locks+0x130/0x130 [ 568.006551] ? trace_hardirqs_on+0xbd/0x310 [ 568.010884] ? kasan_check_read+0x11/0x20 [ 568.015139] ? finish_task_switch+0x1f5/0x900 [ 568.019635] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 568.025270] ? compat_start_thread+0x80/0x80 [ 568.029678] ? cpu_load_update_active+0x2c0/0x2c0 [ 568.034685] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.040237] ? mark_held_locks+0x130/0x130 [ 568.044597] ? mark_held_locks+0x130/0x130 [ 568.048835] ? kasan_check_write+0x14/0x20 [ 568.053177] ? finish_task_switch+0x2f5/0x900 [ 568.057749] ? __switch_to_asm+0x40/0x70 [ 568.061864] ? preempt_notifier_register+0x200/0x200 [ 568.067108] ? __switch_to_asm+0x34/0x70 [ 568.071172] ? __switch_to_asm+0x34/0x70 [ 568.075373] ? __switch_to_asm+0x40/0x70 [ 568.079433] ? __switch_to_asm+0x34/0x70 [ 568.083582] ? __switch_to_asm+0x40/0x70 [ 568.087634] ? __switch_to_asm+0x34/0x70 [ 568.091680] ? __switch_to_asm+0x40/0x70 [ 568.095832] ? __switch_to_asm+0x34/0x70 [ 568.099903] ? __switch_to_asm+0x34/0x70 [ 568.104084] ? __switch_to_asm+0x40/0x70 [ 568.108144] ? __switch_to_asm+0x34/0x70 [ 568.112197] ? __switch_to_asm+0x40/0x70 [ 568.116549] ? __switch_to_asm+0x34/0x70 [ 568.120605] ? __switch_to_asm+0x40/0x70 [ 568.124736] ? __schedule+0x874/0x1ed0 [ 568.128667] ? lock_acquire+0x1ed/0x520 [ 568.132644] ? lock_timer_base+0xbb/0x2b0 [ 568.136937] ? lock_release+0x970/0x970 [ 568.140907] ? trace_hardirqs_off+0xb8/0x310 [ 568.145479] ? debug_object_assert_init+0x368/0x4b0 [ 568.150558] ? lock_timer_base+0xbb/0x2b0 [ 568.154831] ? trace_hardirqs_on+0x310/0x310 [ 568.159306] ? try_to_del_timer_sync+0xec/0x140 [ 568.164070] ? lock_downgrade+0x900/0x900 [ 568.168216] ? init_timer_key+0x480/0x480 [ 568.172364] ? _raw_spin_lock_irqsave+0xa1/0xd0 [ 568.177205] ? trace_hardirqs_on+0xbd/0x310 [ 568.181529] ? kasan_check_read+0x11/0x20 [ 568.185777] ? try_to_del_timer_sync+0xec/0x140 [ 568.190447] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 568.196011] ? stub_timer+0x10/0x10 [ 568.199642] ? lock_downgrade+0x900/0x900 [ 568.203937] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 568.209050] ? try_to_del_timer_sync+0xec/0x140 [ 568.213856] ? del_timer+0x150/0x150 [ 568.217573] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.223203] kjournald2+0x26d/0xb30 [ 568.226900] ? __bpf_trace_jbd2_end_commit+0x30/0x30 [ 568.232114] ? __kthread_parkme+0xce/0x1a0 [ 568.236484] ? lock_downgrade+0x900/0x900 [ 568.240629] ? trace_hardirqs_on+0xbd/0x310 [ 568.245295] ? finish_wait+0x430/0x430 [ 568.249184] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 568.254722] ? kasan_check_write+0x14/0x20 [ 568.259001] ? do_raw_spin_lock+0xc1/0x200 [ 568.263340] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 568.268445] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 568.274105] ? __kthread_parkme+0xfb/0x1a0 [ 568.278343] kthread+0x35a/0x420 [ 568.281706] ? __bpf_trace_jbd2_end_commit+0x30/0x30 [ 568.286975] ? kthread_bind+0x40/0x40 [ 568.290773] ret_from_fork+0x3a/0x50 [ 568.294583] INFO: lockdep is turned off. [ 568.298698] NMI backtrace for cpu 0 [ 568.302355] CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc6+ #268 [ 568.309371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.318755] Call Trace: [ 568.321403] dump_stack+0x1c4/0x2b4 [ 568.325021] ? dump_stack_print_info.cold.2+0x52/0x52 [ 568.330203] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.335782] nmi_cpu_backtrace.cold.3+0x63/0xa2 [ 568.340538] ? lapic_can_unplug_cpu.cold.27+0x3f/0x3f [ 568.345725] nmi_trigger_cpumask_backtrace+0x1b3/0x1ed [ 568.351038] arch_trigger_cpumask_backtrace+0x14/0x20 [ 568.356220] watchdog+0xb3e/0x1050 [ 568.359757] ? reset_hung_task_detector+0xd0/0xd0 [ 568.364589] ? __kthread_parkme+0xce/0x1a0 [ 568.368817] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 568.374012] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 568.379280] ? lockdep_hardirqs_on+0x421/0x5c0 [ 568.383853] ? trace_hardirqs_on+0xbd/0x310 [ 568.388279] ? kasan_check_read+0x11/0x20 [ 568.392520] ? __kthread_parkme+0xce/0x1a0 [ 568.396753] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 568.402291] ? kasan_check_write+0x14/0x20 [ 568.406529] ? do_raw_spin_lock+0xc1/0x200 [ 568.410767] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 568.415860] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 568.421438] ? __kthread_parkme+0xfb/0x1a0 [ 568.425671] kthread+0x35a/0x420 [ 568.429080] ? reset_hung_task_detector+0xd0/0xd0 [ 568.433977] ? kthread_bind+0x40/0x40 [ 568.437782] ret_from_fork+0x3a/0x50 [ 568.441565] Sending NMI from CPU 0 to CPUs 1: [ 568.447153] NMI backtrace for cpu 1 [ 568.447158] CPU: 1 PID: 5818 Comm: syz-executor523 Not tainted 4.19.0-rc6+ #268 [ 568.447163] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.447165] RIP: 0010:ext4_find_extent+0x59d/0x9b0 [ 568.447173] Code: 48 c1 e8 03 0f b6 14 30 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 78 03 00 00 41 8b 1f 44 89 e7 89 de e8 e3 a3 6d ff <41> 39 dc 0f 82 76 ff ff ff e8 45 a3 6d ff 4d 8d 6f 0c e8 3c a3 6d [ 568.447176] RSP: 0018:ffff8801bbd57150 EFLAGS: 00000293 [ 568.447182] RAX: 0000000000000000 RBX: 000000000001a000 RCX: ffffffff8211122d [ 568.447185] RDX: 000000000001a000 RSI: 0000000068024c66 RDI: 0000000000000004 [ 568.447188] RBP: ffff8801bbd571b0 R08: ffff8801bbc6c2c0 R09: ffffed00372690b4 [ 568.447192] R10: ffffed00372690b4 R11: ffff8801b93485a3 R12: 0000000068024c66 [ 568.447195] R13: ffff8801b87e4018 R14: ffff8801b87e4090 R15: ffff8801b87e4054 [ 568.447199] FS: 0000000001aab880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 568.447202] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 568.447205] CR2: 00005571f2fc10d0 CR3: 00000001d7048000 CR4: 00000000001406e0 [ 568.447206] Call Trace: [ 568.447209] mext_check_coverage.constprop.13+0x2b0/0x510 [ 568.447212] ? mext_page_mkuptodate+0x12b0/0x12b0 [ 568.447214] ext4_move_extents+0x2784/0x3c20 [ 568.447217] ? ext4_double_up_write_data_sem+0x30/0x30 [ 568.447219] ? jbd2_journal_stop+0x430/0x15d0 [ 568.447221] ? kmem_cache_free+0x21a/0x290 [ 568.447223] ? jbd2_journal_stop+0x234/0x15d0 [ 568.447226] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.447229] ? ext4_reserve_inode_write+0x148/0x260 [ 568.447231] ? ext4_mark_inode_dirty+0x26f/0xb30 [ 568.447234] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 568.447236] ? ext4_alloc_file_blocks+0x50b/0xaf0 [ 568.447239] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 568.447241] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 568.447244] ? ktime_get_coarse_real_ts64+0x243/0x3b0 [ 568.447246] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.447249] ? inode_init_owner+0x340/0x340 [ 568.447251] ? current_time+0x131/0x1b0 [ 568.447253] ? lock_acquire+0x1ed/0x520 [ 568.447255] ? mnt_want_write_file+0x68/0x110 [ 568.447257] ? lock_release+0x970/0x970 [ 568.447260] ? arch_local_save_flags+0x40/0x40 [ 568.447262] ? fget_raw+0x20/0x20 [ 568.447264] ? lock_release+0x970/0x970 [ 568.447266] ? arch_local_save_flags+0x40/0x40 [ 568.447269] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.447271] ? check_preemption_disabled+0x48/0x200 [ 568.447274] ? preempt_count_add+0x7d/0x160 [ 568.447276] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.447279] ? __mnt_want_write_file+0xa2/0xc0 [ 568.447281] ext4_ioctl+0x3154/0x4210 [ 568.447283] ? aa_path_link+0x5e0/0x5e0 [ 568.447285] ? ext4_ioctl_group_add+0x560/0x560 [ 568.447287] ? generic_write_checks+0x382/0x5d0 [ 568.447290] ? ext4_insert_range+0x1410/0x1410 [ 568.447293] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 568.447295] ? __generic_file_write_iter+0x1bd/0x630 [ 568.447297] ? vfs_fallocate+0x7ab/0x940 [ 568.447299] ? lock_downgrade+0x900/0x900 [ 568.447302] ? arch_local_save_flags+0x40/0x40 [ 568.447304] ? fsnotify_first_mark+0x350/0x350 [ 568.447306] ? arch_local_save_flags+0x40/0x40 [ 568.447309] ? fsnotify+0x12f0/0x12f0 [ 568.447311] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.447314] ? check_preemption_disabled+0x48/0x200 [ 568.447316] ? __sb_end_write+0xd9/0x110 [ 568.447318] ? vfs_fallocate+0x548/0x940 [ 568.447320] ? ioctl_preallocate+0x145/0x300 [ 568.447323] ? ioctl_file_clone+0x120/0x120 [ 568.447325] ? vfs_write+0x2f3/0x560 [ 568.447327] ? ext4_ioctl_group_add+0x560/0x560 [ 568.447329] do_vfs_ioctl+0x1de/0x1720 [ 568.447332] ? fsnotify_first_mark+0x350/0x350 [ 568.447334] ? __fsnotify_parent+0xcc/0x420 [ 568.447337] ? ioctl_preallocate+0x300/0x300 [ 568.447339] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.447342] ? __fget_light+0x2e9/0x430 [ 568.447344] ? fget_raw+0x20/0x20 [ 568.447346] ? __sb_end_write+0xd9/0x110 [ 568.447348] ? ksys_write+0x1ae/0x260 [ 568.447351] ? security_file_ioctl+0x94/0xc0 [ 568.447353] ksys_ioctl+0xa9/0xd0 [ 568.447355] __x64_sys_ioctl+0x73/0xb0 [ 568.447357] do_syscall_64+0x1b9/0x820 [ 568.447359] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 568.447362] ? syscall_return_slowpath+0x5e0/0x5e0 [ 568.447364] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 568.447367] ? trace_hardirqs_on_caller+0x310/0x310 [ 568.447369] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 568.447372] ? prepare_exit_to_usermode+0x291/0x3b0 [ 568.447374] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 568.447377] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 568.447379] RIP: 0033:0x4402b9 [ 568.447386] 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 [ 568.447389] RSP: 002b:00007ffd5c5f8ce8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 568.447394] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004402b9 [ 568.447398] RDX: 0000000020000300 RSI: 00000000c028660f RDI: 0000000000000003 [ 568.447401] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 568.447404] R10: 00000000004002c8 R11: 0000000000000217 R12: 0000000000401b40 [ 568.447408] R13: 0000000000401bd0 R14: 0000000000000000 R15: 0000000000000000 [ 568.448369] Kernel panic - not syncing: hung_task: blocked tasks [ 568.958865] CPU: 0 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc6+ #268 [ 568.965777] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.975127] Call Trace: [ 568.977715] dump_stack+0x1c4/0x2b4 [ 568.981392] ? dump_stack_print_info.cold.2+0x52/0x52 [ 568.986645] panic+0x238/0x4e7 [ 568.989833] ? add_taint.cold.5+0x16/0x16 [ 568.993985] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 568.999499] ? nmi_trigger_cpumask_backtrace+0x1c4/0x1ed [ 569.004943] ? nmi_trigger_cpumask_backtrace+0x173/0x1ed [ 569.010432] ? nmi_trigger_cpumask_backtrace+0x16a/0x1ed [ 569.015886] watchdog+0xb4f/0x1050 [ 569.019422] ? reset_hung_task_detector+0xd0/0xd0 [ 569.024257] ? __kthread_parkme+0xce/0x1a0 [ 569.028486] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 569.033582] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 569.038678] ? lockdep_hardirqs_on+0x421/0x5c0 [ 569.043261] ? trace_hardirqs_on+0xbd/0x310 [ 569.047572] ? kasan_check_read+0x11/0x20 [ 569.051704] ? __kthread_parkme+0xce/0x1a0 [ 569.055947] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 569.061402] ? kasan_check_write+0x14/0x20 [ 569.065631] ? do_raw_spin_lock+0xc1/0x200 [ 569.069956] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 569.075113] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 569.080655] ? __kthread_parkme+0xfb/0x1a0 [ 569.084929] kthread+0x35a/0x420 [ 569.088287] ? reset_hung_task_detector+0xd0/0xd0 [ 569.093120] ? kthread_bind+0x40/0x40 [ 569.096982] ret_from_fork+0x3a/0x50 [ 569.101674] Kernel Offset: disabled [ 569.105313] Rebooting in 86400 seconds..