[ 45.731067][ T26] audit: type=1800 audit(1554239903.491:26): pid=7734 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 45.759965][ T26] audit: type=1800 audit(1554239903.491:27): pid=7734 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 45.794154][ T26] audit: type=1800 audit(1554239903.501:28): pid=7734 uid=0 auid=4294967295 ses=4294967295 subj=_ 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. [ 46.702209][ T26] audit: type=1800 audit(1554239904.501:29): pid=7734 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 553.801762][ T1042] INFO: task syz-executor375:7884 blocked for more than 143 seconds. [ 553.810321][ T1042] Not tainted 5.1.0-rc3+ #48 [ 553.816510][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 553.825392][ T1042] syz-executor375 D28216 7884 7882 0x80000000 [ 553.831810][ T1042] Call Trace: [ 553.835262][ T1042] __schedule+0x817/0x1cc0 [ 553.839674][ T1042] ? __sched_text_start+0x8/0x8 [ 553.844806][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 553.849886][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 553.855436][ T1042] schedule+0x92/0x180 [ 553.859626][ T1042] schedule_timeout+0x8ca/0xfd0 [ 553.864554][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 553.870024][ T1042] ? usleep_range+0x170/0x170 [ 553.874917][ T1042] ? retint_kernel+0x2d/0x2d [ 553.879744][ T1042] ? _raw_spin_unlock_irq+0x54/0x90 [ 553.885031][ T1042] wait_for_completion+0x29c/0x440 [ 553.890248][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 553.896863][ T1042] ? wake_up_q+0xf0/0xf0 [ 553.901153][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 553.907241][ T1042] exit_aio+0x321/0x3a0 [ 553.911443][ T1042] ? aio_poll_wake+0x11e0/0x11e0 [ 553.916375][ T1042] ? mutex_unlock+0xd/0x10 [ 553.920789][ T1042] mmput+0xcf/0x4c0 [ 553.924714][ T1042] do_exit+0x816/0x2fa0 [ 553.928881][ T1042] ? lock_downgrade+0x880/0x880 [ 553.933826][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 553.940157][ T1042] ? kasan_check_read+0x11/0x20 [ 553.945774][ T1042] ? mm_update_next_owner+0x640/0x640 [ 553.951433][ T1042] ? __x64_sys_io_submit+0x37d/0x580 [ 553.956736][ T1042] ? __ia32_sys_io_destroy+0x420/0x420 [ 553.962306][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 553.967776][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 553.973308][ T1042] do_group_exit+0x135/0x370 [ 553.977918][ T1042] __x64_sys_exit_group+0x44/0x50 [ 553.983013][ T1042] do_syscall_64+0x103/0x610 [ 553.987596][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 553.993645][ T1042] RIP: 0033:0x43ef68 [ 553.997631][ T1042] Code: 4d 63 d2 4b 8b 04 d1 0f b6 40 01 88 46 01 44 0f be 47 01 41 83 e8 01 44 89 c0 f7 e9 44 89 c0 b9 67 00 00 00 c1 f8 1f d1 fa 29 8d 04 52 c1 e0 02 41 29 c0 4d 63 c0 4b 8b 04 c1 0f b6 40 02 c6 [ 554.017435][ T1042] RSP: 002b:00007ffc08125018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 554.026044][ T1042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef68 [ 554.034091][ T1042] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 554.042128][ T1042] RBP: 00000000004be768 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 554.050111][ T1042] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 554.058200][ T1042] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 554.066491][ T1042] [ 554.066491][ T1042] Showing all locks held in the system: [ 554.074966][ T1042] 1 lock held by khungtaskd/1042: [ 554.079980][ T1042] #0: 0000000073073a42 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 554.089496][ T1042] 2 locks held by rsyslogd/7772: [ 554.094654][ T1042] #0: 00000000ad8af028 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 554.103466][ T1042] #1: 00000000ce9b8937 (&rq->lock){-.-.}, at: fs_reclaim_acquire.part.0+0x0/0x30 [ 554.112789][ T1042] 2 locks held by getty/7862: [ 554.117591][ T1042] #0: 00000000a169c00a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.126652][ T1042] #1: 00000000e9ff95c3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.136435][ T1042] 2 locks held by getty/7863: [ 554.141101][ T1042] #0: 00000000603b6f62 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.150151][ T1042] #1: 00000000dbb1f6d2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.159785][ T1042] 2 locks held by getty/7864: [ 554.164651][ T1042] #0: 000000005f8a7575 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.173649][ T1042] #1: 00000000759d6307 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.183286][ T1042] 2 locks held by getty/7865: [ 554.188022][ T1042] #0: 000000007389076c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.197128][ T1042] #1: 00000000ad507d45 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.207255][ T1042] 2 locks held by getty/7866: [ 554.211984][ T1042] #0: 0000000025554f6d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.220961][ T1042] #1: 0000000028448bb6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.230614][ T1042] 2 locks held by getty/7867: [ 554.235384][ T1042] #0: 000000000233a433 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.244400][ T1042] #1: 00000000fcb55e3d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.254022][ T1042] 2 locks held by getty/7868: [ 554.258746][ T1042] #0: 000000002aa91a83 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 554.267861][ T1042] #1: 00000000729fdf65 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 554.277478][ T1042] [ 554.279790][ T1042] ============================================= [ 554.279790][ T1042] [ 554.288313][ T1042] NMI backtrace for cpu 1 [ 554.292689][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc3+ #48 [ 554.300268][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 554.310392][ T1042] Call Trace: [ 554.313697][ T1042] dump_stack+0x172/0x1f0 [ 554.318021][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 554.323220][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 554.328864][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 554.334845][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 554.340786][ T1042] watchdog+0x9b7/0xec0 [ 554.345126][ T1042] kthread+0x357/0x430 [ 554.349194][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 554.354735][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 554.360988][ T1042] ret_from_fork+0x3a/0x50 [ 554.365635][ T1042] Sending NMI from CPU 1 to CPUs 0: [ 554.371078][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 554.373113][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 554.386245][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc3+ #48 [ 554.393775][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 554.404072][ T1042] Call Trace: [ 554.407384][ T1042] dump_stack+0x172/0x1f0 [ 554.411716][ T1042] panic+0x2cb/0x65c [ 554.415592][ T1042] ? __warn_printk+0xf3/0xf3 [ 554.420270][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 554.425972][ T1042] ? ___preempt_schedule+0x16/0x18 [ 554.431135][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 554.437281][ T1042] ? nmi_trigger_cpumask_backtrace+0x1fa/0x236 [ 554.443422][ T1042] ? nmi_trigger_cpumask_backtrace+0x204/0x236 [ 554.449625][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 554.455774][ T1042] watchdog+0x9c8/0xec0 [ 554.459953][ T1042] kthread+0x357/0x430 [ 554.464017][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 554.469554][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 554.475790][ T1042] ret_from_fork+0x3a/0x50 [ 554.482094][ T1042] Kernel Offset: disabled [ 554.486426][ T1042] Rebooting in 86400 seconds..