[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.317864][ T26] audit: type=1800 audit(1553657715.887:33): pid=7532 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 37.339811][ T26] audit: type=1800 audit(1553657715.887:34): pid=7532 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 39.005210][ T26] audit: type=1400 audit(1553657717.577:35): avc: denied { map } for pid=7705 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.123' (ECDSA) to the list of known hosts. executing program [ 445.700771][ T26] audit: type=1400 audit(1553658124.267:36): avc: denied { map } for pid=7718 comm="syz-executor749" path="/root/syz-executor749075180" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 606.623181][ T1041] INFO: task syz-executor749:7718 blocked for more than 143 seconds. [ 606.631713][ T1041] Not tainted 5.1.0-rc2+ #38 [ 606.637681][ T1041] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 606.646430][ T1041] syz-executor749 D27832 7718 7716 0x80000000 [ 606.653009][ T1041] Call Trace: [ 606.656357][ T1041] __schedule+0x817/0x1cc0 [ 606.660763][ T1041] ? __sched_text_start+0x8/0x8 [ 606.665783][ T1041] ? __lock_acquire+0x242a/0x3fb0 [ 606.671369][ T1041] schedule+0x92/0x180 [ 606.676282][ T1041] schedule_timeout+0x8ca/0xfd0 [ 606.681142][ T1041] ? wait_for_completion+0x294/0x440 [ 606.686491][ T1041] ? find_held_lock+0x35/0x130 [ 606.691440][ T1041] ? usleep_range+0x170/0x170 [ 606.696262][ T1041] ? kasan_check_write+0x14/0x20 [ 606.703467][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 606.709273][ T1041] ? wait_for_completion+0x294/0x440 [ 606.714641][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 606.719942][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 606.725393][ T1041] ? trace_hardirqs_on+0x67/0x230 [ 606.730435][ T1041] ? kasan_check_read+0x11/0x20 [ 606.735352][ T1041] wait_for_completion+0x29c/0x440 [ 606.740475][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 606.745869][ T1041] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 606.752623][ T1041] ? wake_up_q+0xf0/0xf0 [ 606.758217][ T1041] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 606.766130][ T1041] exit_aio+0x321/0x3a0 [ 606.770287][ T1041] ? io_submit_one+0x1cf0/0x1cf0 [ 606.775397][ T1041] ? mutex_unlock+0xd/0x10 [ 606.779875][ T1041] mmput+0xcf/0x4c0 [ 606.783789][ T1041] do_exit+0x816/0x2fa0 [ 606.787962][ T1041] ? lock_downgrade+0x880/0x880 [ 606.792862][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 606.799219][ T1041] ? kasan_check_read+0x11/0x20 [ 606.804165][ T1041] ? mm_update_next_owner+0x640/0x640 [ 606.809552][ T1041] ? __x64_sys_io_submit+0x37d/0x580 [ 606.814921][ T1041] ? __ia32_sys_io_destroy+0x420/0x420 [ 606.820648][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 606.826177][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 606.831800][ T1041] do_group_exit+0x135/0x370 [ 606.836469][ T1041] __x64_sys_exit_group+0x44/0x50 [ 606.841515][ T1041] do_syscall_64+0x103/0x610 [ 606.846232][ T1041] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 606.852133][ T1041] RIP: 0033:0x43ee88 [ 606.856101][ T1041] Code: 4f 07 89 c8 f6 ea 66 c1 e8 08 89 c2 89 c8 c0 f8 07 c0 fa 02 29 c2 41 8d 43 06 8d 14 92 01 d2 29 d1 83 c1 30 42 88 0c 06 4c 63 42 c6 04 06 00 c3 90 0f b6 57 09 41 b8 14 00 00 00 b8 14 00 00 [ 606.876227][ T1041] RSP: 002b:00007ffd6f93f4b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 606.884798][ T1041] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee88 [ 606.892780][ T1041] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 606.900855][ T1041] RBP: 00000000004be7e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 606.909007][ T1041] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 606.917168][ T1041] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 606.925552][ T1041] [ 606.925552][ T1041] Showing all locks held in the system: [ 606.933323][ T1041] 1 lock held by khungtaskd/1041: [ 606.938340][ T1041] #0: 000000005d30039b (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 606.947863][ T1041] 2 locks held by rsyslogd/7570: [ 606.952809][ T1041] #0: 00000000cb744b07 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 606.961624][ T1041] #1: 00000000f60c0e41 (&rq->lock){-.-.}, at: __schedule+0x1fc/0x1cc0 [ 606.970061][ T1041] 2 locks held by getty/7692: [ 606.974777][ T1041] #0: 00000000b82308cd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 606.984031][ T1041] #1: 00000000c9f15d49 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 606.993933][ T1041] 2 locks held by getty/7693: [ 606.998606][ T1041] #0: 00000000f45105a2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 607.007770][ T1041] #1: 00000000375785d2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 607.017422][ T1041] 2 locks held by getty/7694: [ 607.022087][ T1041] #0: 00000000d9110eea (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 607.031261][ T1041] #1: 0000000054a3a565 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 607.041005][ T1041] 2 locks held by getty/7695: [ 607.045966][ T1041] #0: 0000000030c123c7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 607.055086][ T1041] #1: 0000000081c7daac (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 607.064808][ T1041] 2 locks held by getty/7696: [ 607.069479][ T1041] #0: 0000000083c84b33 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 607.078499][ T1041] #1: 00000000527af96e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 607.088268][ T1041] 2 locks held by getty/7697: [ 607.092989][ T1041] #0: 00000000491dc1e7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 607.102042][ T1041] #1: 00000000dd0c9af4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 607.112005][ T1041] 2 locks held by getty/7698: [ 607.116801][ T1041] #0: 00000000de430bdd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 607.125932][ T1041] #1: 00000000ac32d25a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 607.135572][ T1041] [ 607.137899][ T1041] ============================================= [ 607.137899][ T1041] [ 607.146458][ T1041] NMI backtrace for cpu 0 [ 607.150800][ T1041] CPU: 0 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc2+ #38 [ 607.158379][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 607.168443][ T1041] Call Trace: [ 607.171967][ T1041] dump_stack+0x172/0x1f0 [ 607.176563][ T1041] nmi_cpu_backtrace.cold+0x63/0xa4 [ 607.181817][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 607.187441][ T1041] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 607.193415][ T1041] arch_trigger_cpumask_backtrace+0x14/0x20 [ 607.199385][ T1041] watchdog+0x9b7/0xec0 [ 607.203693][ T1041] kthread+0x357/0x430 [ 607.207765][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 607.213401][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 607.219661][ T1041] ret_from_fork+0x3a/0x50 [ 607.224169][ T1041] Sending NMI from CPU 0 to CPUs 1: [ 607.229633][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x2/0x10 [ 607.230551][ T1041] Kernel panic - not syncing: hung_task: blocked tasks [ 607.244968][ T1041] CPU: 0 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc2+ #38 [ 607.252555][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 607.262618][ T1041] Call Trace: [ 607.265964][ T1041] dump_stack+0x172/0x1f0 [ 607.270478][ T1041] panic+0x2cb/0x65c [ 607.274363][ T1041] ? __warn_printk+0xf3/0xf3 [ 607.278947][ T1041] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 607.284908][ T1041] ? printk_safe_flush+0xf2/0x140 [ 607.289952][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 607.296198][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 607.301835][ T1041] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 607.307987][ T1041] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 607.314145][ T1041] watchdog+0x9c8/0xec0 [ 607.318293][ T1041] kthread+0x357/0x430 [ 607.322363][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 607.327919][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 607.334300][ T1041] ret_from_fork+0x3a/0x50 [ 607.340216][ T1041] Kernel Offset: disabled [ 607.344854][ T1041] Rebooting in 86400 seconds..