[ 37.067645][ T26] audit: type=1800 audit(1554597421.511:26): pid=7637 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 37.090454][ T26] audit: type=1800 audit(1554597421.511:27): pid=7637 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.131775][ T26] audit: type=1800 audit(1554597421.601:28): pid=7637 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. [ 38.034525][ T26] audit: type=1800 audit(1554597422.501:29): pid=7637 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 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.214' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 525.309566][ T1042] INFO: task syz-executor283:7788 blocked for more than 143 seconds. [ 525.318439][ T1042] Not tainted 5.1.0-rc3+ #56 [ 525.323640][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 525.332374][ T1042] syz-executor283 D28216 7788 7786 0x80000000 [ 525.338706][ T1042] Call Trace: [ 525.342091][ T1042] __schedule+0x817/0x1cc0 [ 525.355573][ T1042] ? __sched_text_start+0x8/0x8 [ 525.360492][ T1042] ? __lock_acquire+0x242a/0x3fb0 [ 525.365530][ T1042] schedule+0x92/0x180 [ 525.369679][ T1042] schedule_timeout+0x8ca/0xfd0 [ 525.374529][ T1042] ? wait_for_completion+0x294/0x440 [ 525.380026][ T1042] ? find_held_lock+0x35/0x130 [ 525.384908][ T1042] ? usleep_range+0x170/0x170 [ 525.390599][ T1042] ? kasan_check_write+0x14/0x20 [ 525.395559][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 525.400899][ T1042] ? wait_for_completion+0x294/0x440 [ 525.406198][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 525.411507][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 525.416801][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 525.421903][ T1042] ? kasan_check_read+0x11/0x20 [ 525.426762][ T1042] wait_for_completion+0x29c/0x440 [ 525.431947][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 525.437452][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 525.444094][ T1042] ? wake_up_q+0xf0/0xf0 [ 525.448522][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 525.454818][ T1042] exit_aio+0x321/0x3a0 [ 525.459141][ T1042] ? aio_poll_wake+0x11e0/0x11e0 [ 525.464207][ T1042] ? mutex_unlock+0xd/0x10 [ 525.468637][ T1042] mmput+0xcf/0x4c0 [ 525.472537][ T1042] do_exit+0x816/0x2fa0 [ 525.476792][ T1042] ? lock_downgrade+0x880/0x880 [ 525.481853][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 525.488105][ T1042] ? kasan_check_read+0x11/0x20 [ 525.494536][ T1042] ? mm_update_next_owner+0x640/0x640 [ 525.500056][ T1042] ? __x64_sys_io_submit+0x37d/0x580 [ 525.505344][ T1042] ? __ia32_sys_io_destroy+0x420/0x420 [ 525.510914][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 525.516393][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 525.522233][ T1042] do_group_exit+0x135/0x370 [ 525.526840][ T1042] __x64_sys_exit_group+0x44/0x50 [ 525.532236][ T1042] do_syscall_64+0x103/0x610 [ 525.537178][ T1042] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 525.543150][ T1042] RIP: 0033:0x43eed8 [ 525.547167][ T1042] Code: Bad RIP value. [ 525.551549][ T1042] RSP: 002b:00007ffe21b3e2b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 525.560029][ T1042] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eed8 [ 525.568062][ T1042] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 525.576286][ T1042] RBP: 00000000004be6e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 525.585803][ T1042] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 525.593899][ T1042] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 525.601933][ T1042] [ 525.601933][ T1042] Showing all locks held in the system: [ 525.609963][ T1042] 1 lock held by khungtaskd/1042: [ 525.614977][ T1042] #0: 00000000fef6d81a (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 525.624539][ T1042] 2 locks held by rsyslogd/7676: [ 525.629497][ T1042] #0: 00000000f63e98e9 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 525.638433][ T1042] #1: 0000000028471fad (&rq->lock){-.-.}, at: __schedule+0x1fc/0x1cc0 [ 525.646866][ T1042] 2 locks held by getty/7765: [ 525.651702][ T1042] #0: 00000000a6618033 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.660735][ T1042] #1: 00000000e5868c14 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.670584][ T1042] 2 locks held by getty/7766: [ 525.675257][ T1042] #0: 00000000266ef449 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.684399][ T1042] #1: 0000000008317c32 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.694156][ T1042] 2 locks held by getty/7767: [ 525.698822][ T1042] #0: 000000009586f576 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.708332][ T1042] #1: 00000000550081a3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.718009][ T1042] 2 locks held by getty/7768: [ 525.722758][ T1042] #0: 00000000163f4f46 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.731769][ T1042] #1: 000000004d0ca1a6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.741623][ T1042] 2 locks held by getty/7769: [ 525.747686][ T1042] #0: 0000000045f3f516 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.756787][ T1042] #1: 00000000b02cdb79 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.766448][ T1042] 2 locks held by getty/7770: [ 525.771192][ T1042] #0: 000000006daef7aa (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.780193][ T1042] #1: 000000007141fc58 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.790593][ T1042] 2 locks held by getty/7771: [ 525.795279][ T1042] #0: 0000000086ded6d4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 525.804329][ T1042] #1: 00000000bde0ba7e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 525.814210][ T1042] [ 525.816538][ T1042] ============================================= [ 525.816538][ T1042] [ 525.825017][ T1042] NMI backtrace for cpu 0 [ 525.829405][ T1042] CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc3+ #56 [ 525.836936][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 525.847612][ T1042] Call Trace: [ 525.851049][ T1042] dump_stack+0x172/0x1f0 [ 525.855389][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 525.861274][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 525.867100][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 525.873190][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 525.879534][ T1042] watchdog+0x9b7/0xec0 [ 525.883696][ T1042] kthread+0x357/0x430 [ 525.887767][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 525.893312][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 525.899675][ T1042] ret_from_fork+0x3a/0x50 [ 525.904197][ T1042] Sending NMI from CPU 0 to CPUs 1: [ 525.909529][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x2/0x10 [ 525.910471][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 525.924699][ T1042] CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc3+ #56 [ 525.932856][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 525.943173][ T1042] Call Trace: [ 525.946474][ T1042] dump_stack+0x172/0x1f0 [ 525.950815][ T1042] panic+0x2cb/0x65c [ 525.954711][ T1042] ? __warn_printk+0xf3/0xf3 [ 525.959298][ T1042] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 525.965033][ T1042] ? printk_safe_flush+0xf2/0x140 [ 525.970067][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 525.976316][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 525.981939][ T1042] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 525.988090][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 525.994438][ T1042] watchdog+0x9c8/0xec0 [ 525.998605][ T1042] kthread+0x357/0x430 [ 526.002671][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 526.008325][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 526.014626][ T1042] ret_from_fork+0x3a/0x50 [ 526.020067][ T1042] Kernel Offset: disabled [ 526.024404][ T1042] Rebooting in 86400 seconds..