[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 65.005387][ T27] audit: type=1800 audit(1577701949.328:25): pid=9202 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 65.025840][ T27] audit: type=1800 audit(1577701949.338:26): pid=9202 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 65.060193][ T27] audit: type=1800 audit(1577701949.338:27): pid=9202 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 '10.128.10.48' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 715.610299][ T1116] INFO: task syz-executor031:9787 can't die for more than 143 seconds. [ 715.618859][ T1116] syz-executor031 R running task 28040 9787 9356 0x00004006 [ 715.628278][ T1116] Call Trace: [ 715.631832][ T1116] __schedule+0x934/0x1f90 [ 715.636259][ T1116] ? retint_kernel+0x2b/0x2b [ 715.641032][ T1116] ? firmware_map_remove+0x1a0/0x1a0 [ 715.646732][ T1116] ? paste_selection+0x2f0/0x460 [ 715.651867][ T1116] ? __schedule+0x26/0x1f90 [ 715.656384][ T1116] schedule+0xdc/0x2b0 [ 715.660634][ T1116] paste_selection+0x2f5/0x460 [ 715.665420][ T1116] ? vcs_remove_sysfs+0x60/0x60 [ 715.670839][ T1116] ? lock_downgrade+0x920/0x920 [ 715.675736][ T1116] ? wake_up_q+0x140/0x140 [ 715.680344][ T1116] tioclinux+0x133/0x480 [ 715.685129][ T1116] vt_ioctl+0x1a41/0x26d0 [ 715.689480][ T1116] ? complete_change_console+0x3a0/0x3a0 [ 715.695389][ T1116] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 715.702583][ T1116] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 715.708500][ T1116] ? tty_jobctrl_ioctl+0x50/0xd40 [ 715.714609][ T1116] ? complete_change_console+0x3a0/0x3a0 [ 715.720491][ T1116] tty_ioctl+0xa37/0x14f0 [ 715.724848][ T1116] ? tty_vhangup+0x30/0x30 [ 715.729284][ T1116] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 715.735793][ T1116] ? do_vfs_ioctl+0x11b/0x1340 [ 715.740725][ T1116] ? ioctl_file_clone+0x180/0x180 [ 715.746053][ T1116] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 715.752559][ T1116] ? debug_smp_processor_id+0x33/0x18a [ 715.758087][ T1116] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 715.764439][ T1116] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 715.770000][ T1116] ? tomoyo_file_ioctl+0x23/0x30 [ 715.775128][ T1116] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 715.781714][ T1116] ? security_file_ioctl+0x8d/0xc0 [ 715.786855][ T1116] ? tty_vhangup+0x30/0x30 [ 715.791636][ T1116] ksys_ioctl+0x123/0x180 [ 715.796078][ T1116] __x64_sys_ioctl+0x73/0xb0 [ 715.800991][ T1116] do_syscall_64+0xfa/0x790 [ 715.805526][ T1116] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 715.811732][ T1116] RIP: 0033:0x441219 [ 715.815648][ T1116] Code: 64 20 69 6e 20 74 68 65 20 63 75 72 72 65 6e 74 20 63 6f 64 65 20 62 61 73 65 2e 00 00 00 00 00 00 72 73 79 73 6c 6f 67 64 3a <20> 24 41 62 6f 72 74 4f 6e 55 6e 63 6c 65 61 6e 43 6f 6e 66 69 67 [ 715.835899][ T1116] RSP: 002b:00007ffe5f04c228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 715.845424][ T1116] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441219 [ 715.853680][ T1116] RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 [ 715.863641][ T1116] RBP: 0000000000089d17 R08: 000000000000000d R09: 00000000004002c8 [ 715.872554][ T1116] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402040 [ 715.881391][ T1116] R13: 00000000004020d0 R14: 0000000000000000 R15: 0000000000000000 [ 715.890013][ T1116] [ 715.890013][ T1116] Showing all locks held in the system: [ 715.897917][ T1116] 1 lock held by khungtaskd/1116: [ 715.903166][ T1116] #0: ffffffff899af980 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 715.913834][ T1116] 4 locks held by rs:main Q:Reg/9238: [ 715.919208][ T1116] #0: ffff8880ae937518 (&rq->lock){-.-.}, at: __schedule+0x232/0x1f90 [ 715.927674][ T1116] #1: ffffffff899af980 (rcu_read_lock){....}, at: vfs_write+0x485/0x5d0 [ 715.936347][ T1116] #2: ffff88809025d508 (&sb->s_type->i_mutex_key#11){+.+.}, at: ext4_buffered_write_iter+0xba/0x460 [ 715.947465][ T1116] #3: ffffffff899af980 (rcu_read_lock){....}, at: current_time+0x6b/0x110 [ 715.956257][ T1116] 1 lock held by rsyslogd/9240: [ 715.961339][ T1116] #0: ffff888097f738e0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 715.971127][ T1116] 2 locks held by getty/9331: [ 715.975804][ T1116] #0: ffff888095d85090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 715.985046][ T1116] #1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 715.994850][ T1116] 2 locks held by getty/9332: [ 715.999535][ T1116] #0: ffff8880a2cf9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 716.008745][ T1116] #1: ffffc9000179b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 716.018522][ T1116] 2 locks held by getty/9333: [ 716.023346][ T1116] #0: ffff8880a2aa6090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 716.032680][ T1116] #1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 716.042445][ T1116] 2 locks held by getty/9334: [ 716.047266][ T1116] #0: ffff8880a77e4090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 716.056503][ T1116] #1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 716.066250][ T1116] 2 locks held by getty/9335: [ 716.071148][ T1116] #0: ffff8880a9722090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 716.080308][ T1116] #1: ffffc900017eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 716.089876][ T1116] 2 locks held by getty/9336: [ 716.094738][ T1116] #0: ffff8880a2151090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 716.104774][ T1116] #1: ffffc900011442e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 716.114589][ T1116] 2 locks held by login/9694: [ 716.119363][ T1116] #0: ffff888099aab198 (&tty->legacy_mutex){+.+.}, at: tty_lock+0xc7/0x130 [ 716.128313][ T1116] #1: ffff888099aab090 (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x33/0x40 [ 716.137553][ T1116] 2 locks held by syz-executor031/9787: [ 716.143251][ T1116] [ 716.145606][ T1116] ============================================= [ 716.145606][ T1116] [ 716.154185][ T1116] NMI backtrace for cpu 0 [ 716.158523][ T1116] CPU: 0 PID: 1116 Comm: khungtaskd Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 716.167971][ T1116] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.178037][ T1116] Call Trace: [ 716.181402][ T1116] dump_stack+0x197/0x210 [ 716.185754][ T1116] nmi_cpu_backtrace.cold+0x70/0xb2 [ 716.191027][ T1116] ? vprintk_func+0x86/0x189 [ 716.195812][ T1116] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 716.201464][ T1116] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 716.207461][ T1116] arch_trigger_cpumask_backtrace+0x14/0x20 [ 716.213381][ T1116] watchdog+0xdf1/0x14e0 [ 716.217694][ T1116] kthread+0x361/0x430 [ 716.221773][ T1116] ? reset_hung_task_detector+0x30/0x30 [ 716.227316][ T1116] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 716.233046][ T1116] ret_from_fork+0x24/0x30 [ 716.237576][ T1116] Sending NMI from CPU 0 to CPUs 1: [ 716.243402][ C1] NMI backtrace for cpu 1 [ 716.243410][ C1] CPU: 1 PID: 9787 Comm: syz-executor031 Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 716.243416][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.243420][ C1] RIP: 0010:debug_lockdep_rcu_enabled+0x5a/0xa0 [ 716.243432][ C1] Code: b0 f0 1f 09 85 d2 74 3b 48 c7 c0 94 9c 81 8a 48 ba 00 00 00 00 00 fc ff df 48 89 c1 83 e0 07 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 04 84 d2 75 23 8b 05 5c 21 20 09 85 c0 74 07 e8 2f ff ff [ 716.243436][ C1] RSP: 0018:ffffc90001f17870 EFLAGS: 00000002 [ 716.243444][ C1] RAX: 0000000000000007 RBX: ffff8880a5134640 RCX: 1ffffffff1503392 [ 716.243449][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000086 [ 716.243454][ C1] RBP: ffffc90001f17870 R08: 1ffffffff165b7ac R09: fffffbfff165b7ad [ 716.243459][ C1] R10: ffff8880a5134ed8 R11: ffff8880a51345c0 R12: ffff8880ae937580 [ 716.243464][ C1] R13: 0000000000000001 R14: ffff8880a51345c0 R15: 00000000000010ed [ 716.243470][ C1] FS: 0000000001a05880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 716.243474][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.243479][ C1] CR2: 00000000006cc080 CR3: 00000000a2c1f000 CR4: 00000000001406e0 [ 716.243484][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.243489][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.243491][ C1] Call Trace: [ 716.243494][ C1] update_curr+0x31f/0x8d0 [ 716.243497][ C1] ? update_curr+0x2ea/0x8d0 [ 716.243501][ C1] ? sched_clock+0x2e/0x50 [ 716.243504][ C1] pick_next_task_fair+0x221/0xc70 [ 716.243507][ C1] __schedule+0x375/0x1f90 [ 716.243511][ C1] ? retint_kernel+0x2b/0x2b [ 716.243514][ C1] ? firmware_map_remove+0x1a0/0x1a0 [ 716.243518][ C1] ? paste_selection+0x2f0/0x460 [ 716.243521][ C1] ? __schedule+0x26/0x1f90 [ 716.243524][ C1] schedule+0xdc/0x2b0 [ 716.243527][ C1] paste_selection+0x2f5/0x460 [ 716.243530][ C1] ? vcs_remove_sysfs+0x60/0x60 [ 716.243534][ C1] ? lock_downgrade+0x920/0x920 [ 716.243537][ C1] ? wake_up_q+0x140/0x140 [ 716.243540][ C1] tioclinux+0x133/0x480 [ 716.243543][ C1] vt_ioctl+0x1a41/0x26d0 [ 716.243547][ C1] ? complete_change_console+0x3a0/0x3a0 [ 716.243550][ C1] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 716.243554][ C1] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 716.243558][ C1] ? tty_jobctrl_ioctl+0x50/0xd40 [ 716.243562][ C1] ? complete_change_console+0x3a0/0x3a0 [ 716.243565][ C1] tty_ioctl+0xa37/0x14f0 [ 716.243568][ C1] ? tty_vhangup+0x30/0x30 [ 716.243572][ C1] ? __sanitizer_cov_trace_const_cmp2+0x18/0x20 [ 716.243575][ C1] ? do_vfs_ioctl+0x11b/0x1340 [ 716.243579][ C1] ? ioctl_file_clone+0x180/0x180 [ 716.243583][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 716.243586][ C1] ? debug_smp_processor_id+0x33/0x18a [ 716.243590][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 716.243594][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 716.243597][ C1] ? tomoyo_file_ioctl+0x23/0x30 [ 716.243601][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 716.243605][ C1] ? security_file_ioctl+0x8d/0xc0 [ 716.243608][ C1] ? tty_vhangup+0x30/0x30 [ 716.243611][ C1] ksys_ioctl+0x123/0x180 [ 716.243614][ C1] __x64_sys_ioctl+0x73/0xb0 [ 716.243617][ C1] do_syscall_64+0xfa/0x790 [ 716.243621][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 716.243624][ C1] RIP: 0033:0x441219 [ 716.243636][ C1] Code: e8 3c ad 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 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 716.243639][ C1] RSP: 002b:00007ffe5f04c228 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 716.243648][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441219 [ 716.243653][ C1] RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 [ 716.243658][ C1] RBP: 0000000000089d17 R08: 000000000000000d R09: 00000000004002c8 [ 716.243663][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402040 [ 716.243668][ C1] R13: 00000000004020d0 R14: 0000000000000000 R15: 0000000000000000 [ 716.245670][ T1116] Kernel panic - not syncing: hung_task: blocked tasks [ 716.658129][ T1116] CPU: 0 PID: 1116 Comm: khungtaskd Not tainted 5.5.0-rc2-next-20191220-syzkaller #0 [ 716.667785][ T1116] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.677894][ T1116] Call Trace: [ 716.681225][ T1116] dump_stack+0x197/0x210 [ 716.686294][ T1116] panic+0x2e3/0x75c [ 716.690223][ T1116] ? add_taint.cold+0x16/0x16 [ 716.694952][ T1116] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 716.700599][ T1116] ? ___preempt_schedule+0x16/0x18 [ 716.705718][ T1116] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 716.711874][ T1116] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 716.718043][ T1116] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 716.724198][ T1116] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 716.730356][ T1116] watchdog+0xe02/0x14e0 [ 716.734604][ T1116] kthread+0x361/0x430 [ 716.738673][ T1116] ? reset_hung_task_detector+0x30/0x30 [ 716.744213][ T1116] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 716.749936][ T1116] ret_from_fork+0x24/0x30 [ 716.755515][ T1116] Kernel Offset: disabled [ 716.759869][ T1116] Rebooting in 86400 seconds..