[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 78.107190][ T27] audit: type=1800 audit(1577095909.573:25): pid=9013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 78.127506][ T27] audit: type=1800 audit(1577095909.573:26): pid=9013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 78.173345][ T27] audit: type=1800 audit(1577095909.583:27): pid=9013 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 '10.128.0.198' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 665.596017][ T9172] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 912.793192][ T914] INFO: task login:9482 blocked for more than 143 seconds. [ 912.800786][ T914] Not tainted 5.5.0-rc2-syzkaller #0 [ 912.807672][ T914] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 912.816606][ T914] login D27648 9482 1 0x80000002 [ 912.822957][ T914] Call Trace: [ 912.826523][ T914] __schedule+0x934/0x1f90 [ 912.830988][ T914] ? __sched_text_start+0x8/0x8 [ 912.836176][ T914] ? __lock_acquire+0x29c9/0x4a00 [ 912.841227][ T914] schedule+0xdc/0x2b0 [ 912.846506][ T914] schedule_timeout+0x717/0xc50 [ 912.851426][ T914] ? __kasan_check_read+0x11/0x20 [ 912.856639][ T914] ? usleep_range+0x170/0x170 [ 912.861332][ T914] ? mark_held_locks+0xa4/0xf0 [ 912.866260][ T914] ? _raw_spin_unlock_irq+0x23/0x80 [ 912.871519][ T914] ? __ldsem_down_write_nested+0x3aa/0x8f0 [ 912.877522][ T914] ? _raw_spin_unlock_irq+0x23/0x80 [ 912.882732][ T914] ? lockdep_hardirqs_on+0x421/0x5e0 [ 912.888380][ T914] ? trace_hardirqs_on+0x67/0x240 [ 912.893602][ T914] __ldsem_down_write_nested+0x3b2/0x8f0 [ 912.899252][ T914] ? ldsem_wake+0x40/0x40 [ 912.903823][ T914] ? ___might_sleep+0x163/0x2c0 [ 912.908735][ T914] ? put_tty_driver+0x20/0x20 [ 912.913779][ T914] ldsem_down_write+0x33/0x40 [ 912.918463][ T914] ? ldsem_down_write+0x33/0x40 [ 912.923473][ T914] tty_ldisc_lock+0x66/0xb0 [ 912.927988][ T914] tty_ldisc_hangup+0x1c6/0x640 [ 912.932898][ T914] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 912.939403][ T914] ? put_tty_driver+0x20/0x20 [ 912.944234][ T914] __tty_hangup.part.0+0x2fb/0x750 [ 912.949371][ T914] tty_vhangup_session+0x25/0x30 [ 912.954487][ T914] disassociate_ctty.part.0+0xb4/0x740 [ 912.959965][ T914] disassociate_ctty+0x81/0xa0 [ 912.964972][ T914] do_exit+0x1b42/0x2ef0 [ 912.969264][ T914] ? __vfs_write+0x92/0x110 [ 912.974891][ T914] ? mm_update_next_owner+0x7c0/0x7c0 [ 912.980289][ T914] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 912.986702][ T914] ? ksys_write+0x1cf/0x290 [ 912.991245][ T914] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 912.996907][ T914] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 913.002384][ T914] do_group_exit+0x135/0x360 [ 913.007146][ T914] __x64_sys_exit_group+0x44/0x50 [ 913.012181][ T914] do_syscall_64+0xfa/0x790 [ 913.016878][ T914] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 913.022780][ T914] RIP: 0033:0x7f535b3cd1e8 [ 913.027370][ T914] Code: Bad RIP value. [ 913.031439][ T914] RSP: 002b:00007ffc776e75a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 913.040032][ T914] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f535b3cd1e8 [ 913.048291][ T914] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 913.056434][ T914] RBP: 00007f535b6a2840 R08: 00000000000000e7 R09: ffffffffffffffa8 [ 913.064576][ T914] R10: 00007f535b6a8740 R11: 0000000000000246 R12: 00007f535b6a2840 [ 913.072553][ T914] R13: 0000000000000001 R14: 0000000000000001 R15: 000000000060b798 [ 913.080739][ T914] [ 913.080739][ T914] Showing all locks held in the system: [ 913.088957][ T914] 1 lock held by khungtaskd/914: [ 913.094223][ T914] #0: ffffffff899a5680 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 913.104631][ T914] 1 lock held by rsyslogd/9051: [ 913.109491][ T914] #0: ffff8880a937c860 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 913.118325][ T914] 2 locks held by getty/9142: [ 913.123140][ T914] #0: ffff8880963e4090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 913.132096][ T914] #1: ffffc9000178b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 913.141856][ T914] 2 locks held by getty/9143: [ 913.146668][ T914] #0: ffff8880a0b3c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 913.155794][ T914] #1: ffffc9000177b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 913.165508][ T914] 2 locks held by getty/9144: [ 913.170180][ T914] #0: ffff88809539e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 913.179309][ T914] #1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 913.189022][ T914] 2 locks held by getty/9145: [ 913.193865][ T914] #0: ffff8880a2914090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 913.202820][ T914] #1: ffffc9000170b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 913.212557][ T914] 2 locks held by getty/9146: [ 913.217382][ T914] #0: ffff8880a781e090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 913.226481][ T914] #1: ffffc9000179b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 913.237123][ T914] 2 locks held by getty/9147: [ 913.241801][ T914] #0: ffff88821481a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 913.251010][ T914] #1: ffffc900011402e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 913.260963][ T914] 2 locks held by login/9482: [ 913.265807][ T914] #0: ffff8880a3846198 (&tty->legacy_mutex){+.+.}, at: tty_lock+0xc7/0x130 [ 913.274676][ T914] #1: ffff8880a3846090 (&tty->ldisc_sem){++++}, at: ldsem_down_write+0x33/0x40 [ 913.283876][ T914] 2 locks held by syz-executor605/9574: [ 913.289421][ T914] [ 913.291747][ T914] ============================================= [ 913.291747][ T914] [ 913.300372][ T914] NMI backtrace for cpu 1 [ 913.304810][ T914] CPU: 1 PID: 914 Comm: khungtaskd Not tainted 5.5.0-rc2-syzkaller #0 [ 913.312956][ T914] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 913.323010][ T914] Call Trace: [ 913.326387][ T914] dump_stack+0x197/0x210 [ 913.330727][ T914] nmi_cpu_backtrace.cold+0x70/0xb2 [ 913.335963][ T914] ? vprintk_func+0x86/0x189 [ 913.340606][ T914] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 913.346243][ T914] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 913.352229][ T914] arch_trigger_cpumask_backtrace+0x14/0x20 [ 913.358123][ T914] watchdog+0xb11/0x10c0 [ 913.362413][ T914] kthread+0x361/0x430 [ 913.366494][ T914] ? reset_hung_task_detector+0x30/0x30 [ 913.372040][ T914] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 913.377764][ T914] ret_from_fork+0x24/0x30 [ 913.382262][ T914] Sending NMI from CPU 1 to CPUs 0: [ 913.388394][ C0] NMI backtrace for cpu 0 [ 913.388401][ C0] CPU: 0 PID: 9574 Comm: syz-executor605 Not tainted 5.5.0-rc2-syzkaller #0 [ 913.388407][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 913.388412][ C0] RIP: 0010:rcu_lockdep_current_cpu_online+0x2b/0x130 [ 913.388423][ C0] Code: 8b 15 d1 0f a0 7e 81 e2 00 00 10 00 b8 01 00 00 00 75 0a 8b 15 1a 8b 17 09 85 d2 75 01 c3 55 bf 01 00 00 00 48 89 e5 41 54 53 <48> 83 ec 08 e8 ec c1 ee ff e8 07 2d 31 02 48 c7 c3 00 81 03 00 48 [ 913.388427][ C0] RSP: 0018:ffffc90002c17688 EFLAGS: 00000002 [ 913.388434][ C0] RAX: 0000000000000001 RBX: ffffc90002c176e0 RCX: ffffffff8162ae44 [ 913.388439][ C0] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000001 [ 913.388444][ C0] RBP: ffffc90002c17698 R08: 1ffff11015d0703c R09: ffffed1015d0703d [ 913.388449][ C0] R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: ffff8880ae838115 [ 913.388454][ C0] R13: ffff8880a8bd8040 R14: ffff8880a8bd8040 R15: ffff8880ae837358 [ 913.388460][ C0] FS: 00000000022b1880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 913.388464][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 913.388469][ C0] CR2: 00000000006d3080 CR3: 00000000a2c68000 CR4: 00000000001406f0 [ 913.388474][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 913.388479][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 913.388482][ C0] Call Trace: [ 913.388485][ C0] rcu_read_lock_held_common+0xbd/0x130 [ 913.388489][ C0] rcu_read_lock_sched_held+0x5b/0xd0 [ 913.388493][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 913.388497][ C0] ? __this_cpu_preempt_check+0x35/0x190 [ 913.388501][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 913.388505][ C0] ? __this_cpu_preempt_check+0x35/0x190 [ 913.388508][ C0] rcu_note_context_switch+0x108a/0x1910 [ 913.388512][ C0] ? schedule+0xdc/0x2b0 [ 913.388515][ C0] ? trace_hardirqs_off+0x62/0x240 [ 913.388518][ C0] __schedule+0x22a/0x1f90 [ 913.388521][ C0] ? __sched_text_start+0x8/0x8 [ 913.388525][ C0] ? check_memory_region+0x4f/0x1a0 [ 913.388528][ C0] schedule+0xdc/0x2b0 [ 913.388530][ C0] paste_selection+0x2f5/0x460 [ 913.388533][ C0] ? vcs_remove_sysfs+0x60/0x60 [ 913.388536][ C0] ? lock_downgrade+0x920/0x920 [ 913.388539][ C0] ? wake_up_q+0x140/0x140 [ 913.388541][ C0] tioclinux+0x133/0x480 [ 913.388543][ C0] vt_ioctl+0x1a41/0x26d0 [ 913.388546][ C0] ? complete_change_console+0x3a0/0x3a0 [ 913.388549][ C0] ? lock_downgrade+0x920/0x920 [ 913.388552][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 913.388555][ C0] ? tomoyo_path_number_perm+0x214/0x520 [ 913.388558][ C0] ? find_held_lock+0x35/0x130 [ 913.388561][ C0] ? tomoyo_path_number_perm+0x214/0x520 [ 913.388564][ C0] ? __sanitizer_cov_trace_switch+0x49/0x80 [ 913.388567][ C0] ? tty_jobctrl_ioctl+0x50/0xd40 [ 913.388570][ C0] ? complete_change_console+0x3a0/0x3a0 [ 913.388573][ C0] tty_ioctl+0xa37/0x14f0 [ 913.388575][ C0] ? tty_vhangup+0x30/0x30 [ 913.388578][ C0] ? tomoyo_path_number_perm+0x454/0x520 [ 913.388581][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 913.388584][ C0] ? tomoyo_path_number_perm+0x25e/0x520 [ 913.388588][ C0] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 913.388590][ C0] ? __do_page_fault+0x56a/0xd80 [ 913.388593][ C0] ? tty_vhangup+0x30/0x30 [ 913.388595][ C0] do_vfs_ioctl+0x977/0x14e0 [ 913.388598][ C0] ? compat_ioctl_preallocate+0x220/0x220 [ 913.388602][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 913.388605][ C0] ? debug_smp_processor_id+0x33/0x18a [ 913.388608][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 913.388611][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 913.388614][ C0] ? tomoyo_file_ioctl+0x23/0x30 [ 913.388617][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 913.388620][ C0] ? security_file_ioctl+0x8d/0xc0 [ 913.388622][ C0] ksys_ioctl+0xab/0xd0 [ 913.388625][ C0] __x64_sys_ioctl+0x73/0xb0 [ 913.388627][ C0] do_syscall_64+0xfa/0x790 [ 913.388630][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 913.388633][ C0] RIP: 0033:0x441a79 [ 913.388643][ C0] Code: e8 ec 03 03 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 1b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 913.388646][ C0] RSP: 002b:00007ffd3e475758 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 913.388653][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441a79 [ 913.388657][ C0] RDX: 0000000020000040 RSI: 000000000000541c RDI: 0000000000000003 [ 913.388661][ C0] RBP: 00007ffd3e475780 R08: 000000000000000d R09: 0000000000000000 [ 913.388665][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a874f [ 913.388669][ C0] R13: 0000000000000004 R14: 00007ffd3e4757b0 R15: 0000000000000000 [ 913.390635][ T914] Kernel panic - not syncing: hung_task: blocked tasks [ 913.858560][ T914] CPU: 1 PID: 914 Comm: khungtaskd Not tainted 5.5.0-rc2-syzkaller #0 [ 913.866707][ T914] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 913.876754][ T914] Call Trace: [ 913.880072][ T914] dump_stack+0x197/0x210 [ 913.884409][ T914] panic+0x2e3/0x75c [ 913.888303][ T914] ? add_taint.cold+0x16/0x16 [ 913.893012][ T914] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 913.898669][ T914] ? ___preempt_schedule+0x16/0x18 [ 913.903806][ T914] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 913.909969][ T914] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 913.916130][ T914] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 913.922283][ T914] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 913.928442][ T914] watchdog+0xb22/0x10c0 [ 913.932696][ T914] kthread+0x361/0x430 [ 913.936779][ T914] ? reset_hung_task_detector+0x30/0x30 [ 913.942325][ T914] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 913.948047][ T914] ret_from_fork+0x24/0x30 [ 913.953836][ T914] Kernel Offset: disabled [ 913.958171][ T914] Rebooting in 86400 seconds..