[ 34.231308][ T27] audit: type=1800 audit(1555353835.390:27): pid=7340 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 34.264365][ T27] audit: type=1800 audit(1555353835.430:28): pid=7340 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 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. [ 34.970695][ T27] audit: type=1800 audit(1555353836.130:29): pid=7340 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 34.994537][ T27] audit: type=1800 audit(1555353836.130:30): pid=7340 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.55' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 215.014073][ T1042] INFO: task syz-executor294:7495 blocked for more than 143 seconds. [ 215.022274][ T1042] Not tainted 5.1.0-rc5 #70 [ 215.027395][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 215.036113][ T1042] syz-executor294 D29208 7495 7492 0x00000004 [ 215.042440][ T1042] Call Trace: [ 215.045954][ T1042] __schedule+0x813/0x1cc0 [ 215.050394][ T1042] ? __sched_text_start+0x8/0x8 [ 215.055413][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 215.060447][ T1042] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 215.066329][ T1042] schedule+0x92/0x180 [ 215.070401][ T1042] schedule_timeout+0x8ca/0xfd0 [ 215.075304][ T1042] ? wait_for_completion+0x294/0x440 [ 215.080580][ T1042] ? find_held_lock+0x35/0x130 [ 215.085390][ T1042] ? usleep_range+0x170/0x170 [ 215.090074][ T1042] ? mark_held_locks+0xa4/0xf0 [ 215.094999][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 215.100286][ T1042] ? wait_for_completion+0x294/0x440 [ 215.105645][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 215.110841][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 215.116171][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 215.121190][ T1042] ? kasan_check_read+0x11/0x20 [ 215.126123][ T1042] wait_for_completion+0x29c/0x440 [ 215.131240][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 215.137898][ T1042] ? wake_up_q+0xf0/0xf0 [ 215.142140][ T1042] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 215.148167][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 215.154176][ T1042] __io_uring_register+0xb6/0x1fd0 [ 215.159270][ T1042] ? __mutex_lock+0x3cd/0x1310 [ 215.164117][ T1042] ? __x64_sys_io_uring_register+0x182/0x1f0 [ 215.170098][ T1042] ? io_sq_wq_submit_work+0x10f0/0x10f0 [ 215.175686][ T1042] ? __x64_sys_futex+0x404/0x590 [ 215.180624][ T1042] __x64_sys_io_uring_register+0x193/0x1f0 [ 215.186517][ T1042] do_syscall_64+0x103/0x610 [ 215.191197][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 215.197152][ T1042] RIP: 0033:0x445999 [ 215.201038][ T1042] Code: e8 ec bc 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 cb 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 215.220832][ T1042] RSP: 002b:00007fa97a70edb8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab [ 215.229279][ T1042] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000445999 [ 215.237462][ T1042] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003 [ 215.245482][ T1042] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000 [ 215.253442][ T1042] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c [ 215.261458][ T1042] R13: 00007ffca279299f R14: 00007fa97a70f9c0 R15: 0000000000000000 [ 215.269461][ T1042] INFO: task syz-executor294:7496 blocked for more than 143 seconds. [ 215.277728][ T1042] Not tainted 5.1.0-rc5 #70 [ 215.282767][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 215.291476][ T1042] syz-executor294 D30336 7496 7492 0x00000004 [ 215.297842][ T1042] Call Trace: [ 215.301126][ T1042] __schedule+0x813/0x1cc0 [ 215.305606][ T1042] ? __mutex_lock+0x721/0x1310 [ 215.310366][ T1042] ? __sched_text_start+0x8/0x8 [ 215.315362][ T1042] schedule+0x92/0x180 [ 215.319641][ T1042] schedule_preempt_disabled+0x13/0x20 [ 215.325171][ T1042] __mutex_lock+0x726/0x1310 [ 215.329758][ T1042] ? __x64_sys_io_uring_enter+0x67f/0xac0 [ 215.335579][ T1042] ? mutex_trylock+0x1e0/0x1e0 [ 215.340384][ T1042] ? __x64_sys_io_uring_enter+0x35a/0xac0 [ 215.346151][ T1042] ? lock_downgrade+0x880/0x880 [ 215.351000][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 215.357300][ T1042] mutex_lock_nested+0x16/0x20 [ 215.362060][ T1042] ? mutex_lock_nested+0x16/0x20 [ 215.367105][ T1042] __x64_sys_io_uring_enter+0x67f/0xac0 [ 215.372665][ T1042] ? __io_uring_register+0x1fd0/0x1fd0 [ 215.378189][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 215.383632][ T1042] ? do_syscall_64+0x26/0x610 [ 215.388494][ T1042] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 215.394613][ T1042] ? do_syscall_64+0x26/0x610 [ 215.399274][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 215.404630][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 215.409653][ T1042] do_syscall_64+0x103/0x610 [ 215.414304][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 215.420182][ T1042] RIP: 0033:0x445999 [ 215.424123][ T1042] Code: e8 ec bc 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 cb 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 215.443810][ T1042] RSP: 002b:00007fa97a6edda8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa [ 215.452252][ T1042] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000445999 [ 215.460258][ T1042] RDX: 0000000000000002 RSI: 0000000000010005 RDI: 0000000000000003 [ 215.468263][ T1042] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000 [ 215.476259][ T1042] R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006dbc3c [ 215.484284][ T1042] R13: 00007ffca279299f R14: 00007fa97a6ee9c0 R15: 0000000000000002 [ 215.492261][ T1042] [ 215.492261][ T1042] Showing all locks held in the system: [ 215.500388][ T1042] 1 lock held by khungtaskd/1042: [ 215.505442][ T1042] #0: 00000000b5a861ba (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 215.514802][ T1042] 1 lock held by rsyslogd/7378: [ 215.519630][ T1042] #0: 0000000007d2b1d3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 215.528342][ T1042] 2 locks held by getty/7468: [ 215.533009][ T1042] #0: 000000009b3d70d7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.542028][ T1042] #1: 0000000017139965 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.551737][ T1042] 2 locks held by getty/7469: [ 215.556444][ T1042] #0: 000000001cc2b0a0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.565409][ T1042] #1: 00000000cea7d2be (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.575053][ T1042] 2 locks held by getty/7470: [ 215.579715][ T1042] #0: 00000000b87ea74b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.588718][ T1042] #1: 000000006ba52ac7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.598327][ T1042] 2 locks held by getty/7471: [ 215.602977][ T1042] #0: 00000000dffafc50 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.611947][ T1042] #1: 000000002e1535bf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.621536][ T1042] 2 locks held by getty/7472: [ 215.626223][ T1042] #0: 00000000f9c6525d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.635189][ T1042] #1: 00000000a676d4cd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.644764][ T1042] 2 locks held by getty/7473: [ 215.649419][ T1042] #0: 00000000225242bf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.658387][ T1042] #1: 00000000a095b648 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.667972][ T1042] 2 locks held by getty/7474: [ 215.672670][ T1042] #0: 00000000bb203c70 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 215.681698][ T1042] #1: 00000000661a9df8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 215.692372][ T1042] 1 lock held by syz-executor294/7495: [ 215.697877][ T1042] #0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __x64_sys_io_uring_register+0x182/0x1f0 [ 215.708218][ T1042] 1 lock held by syz-executor294/7496: [ 215.713655][ T1042] #0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __x64_sys_io_uring_enter+0x67f/0xac0 [ 215.723733][ T1042] [ 215.726085][ T1042] ============================================= [ 215.726085][ T1042] [ 215.734534][ T1042] NMI backtrace for cpu 1 [ 215.738867][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc5 #70 [ 215.746304][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 215.756340][ T1042] Call Trace: [ 215.759622][ T1042] dump_stack+0x172/0x1f0 [ 215.763934][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 215.769131][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 215.774747][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 215.780732][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 215.786608][ T1042] watchdog+0x9b7/0xec0 [ 215.790756][ T1042] kthread+0x357/0x430 [ 215.794818][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 215.800339][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 215.806563][ T1042] ret_from_fork+0x3a/0x50 [ 215.811096][ T1042] Sending NMI from CPU 1 to CPUs 0: [ 215.816463][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 215.817394][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 215.831547][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc5 #70 [ 215.839084][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 215.849166][ T1042] Call Trace: [ 215.852447][ T1042] dump_stack+0x172/0x1f0 [ 215.856758][ T1042] panic+0x2cb/0x65c [ 215.860647][ T1042] ? __warn_printk+0xf3/0xf3 [ 215.865220][ T1042] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 215.870934][ T1042] ? printk_safe_flush+0xf2/0x140 [ 215.875940][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 215.882207][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 215.887823][ T1042] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 215.893951][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 215.900088][ T1042] watchdog+0x9c8/0xec0 [ 215.904227][ T1042] kthread+0x357/0x430 [ 215.908286][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 215.913811][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 215.920050][ T1042] ret_from_fork+0x3a/0x50 [ 215.925687][ T1042] Kernel Offset: disabled [ 215.930011][ T1042] Rebooting in 86400 seconds..