[ 41.839210][ T26] audit: type=1800 audit(1554597373.256:31): pid=7775 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[ 42.131784][ T26] audit: type=1800 audit(1554597373.606:32): pid=7775 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [?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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.238' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 386.317857][ T26] kauditd_printk_skb: 3 callbacks suppressed [ 386.317869][ T26] audit: type=1400 audit(1554597717.786:36): avc: denied { map } for pid=7963 comm="syz-executor068" path="/root/syz-executor068923245" 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 [ 550.118723][ T1041] INFO: task syz-executor068:7963 blocked for more than 143 seconds. [ 550.127311][ T1041] Not tainted 5.1.0-rc3+ #55 [ 550.132884][ T1041] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 550.142249][ T1041] syz-executor068 D27832 7963 7961 0x80000000 [ 550.148693][ T1041] Call Trace: [ 550.152181][ T1041] __schedule+0x817/0x1cc0 [ 550.156875][ T1041] ? __sched_text_start+0x8/0x8 [ 550.162453][ T1041] ? __lock_acquire+0x242a/0x3fb0 [ 550.167567][ T1041] schedule+0x92/0x180 [ 550.171935][ T1041] schedule_timeout+0x8ca/0xfd0 [ 550.176782][ T1041] ? wait_for_completion+0x294/0x440 [ 550.182146][ T1041] ? find_held_lock+0x35/0x130 [ 550.187086][ T1041] ? usleep_range+0x170/0x170 [ 550.192011][ T1041] ? kasan_check_write+0x14/0x20 [ 550.197008][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 550.202424][ T1041] ? wait_for_completion+0x294/0x440 [ 550.208167][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 550.213873][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 550.219469][ T1041] ? trace_hardirqs_on+0x67/0x230 [ 550.224602][ T1041] ? kasan_check_read+0x11/0x20 [ 550.229587][ T1041] wait_for_completion+0x29c/0x440 [ 550.234951][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 550.240337][ T1041] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 550.247247][ T1041] ? wake_up_q+0xf0/0xf0 [ 550.251836][ T1041] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 550.257881][ T1041] exit_aio+0x321/0x3a0 [ 550.262208][ T1041] ? aio_poll_wake+0x11e0/0x11e0 [ 550.267395][ T1041] ? mutex_unlock+0xd/0x10 [ 550.272076][ T1041] mmput+0xcf/0x4c0 [ 550.275943][ T1041] do_exit+0x816/0x2fa0 [ 550.280155][ T1041] ? lock_downgrade+0x880/0x880 [ 550.285532][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 550.292386][ T1041] ? kasan_check_read+0x11/0x20 [ 550.297400][ T1041] ? mm_update_next_owner+0x640/0x640 [ 550.303048][ T1041] ? __x64_sys_io_submit+0x37d/0x580 [ 550.308460][ T1041] ? __ia32_sys_io_destroy+0x420/0x420 [ 550.314238][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 550.320358][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 550.325829][ T1041] do_group_exit+0x135/0x370 [ 550.330615][ T1041] __x64_sys_exit_group+0x44/0x50 [ 550.335665][ T1041] do_syscall_64+0x103/0x610 [ 550.340331][ T1041] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 550.346286][ T1041] RIP: 0033:0x43eed8 [ 550.350929][ T1041] Code: Bad RIP value. [ 550.355162][ T1041] RSP: 002b:00007ffcfe9ed718 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 550.363985][ T1041] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eed8 [ 550.372009][ T1041] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 550.380108][ T1041] RBP: 00000000004be6e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 550.388212][ T1041] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 550.396445][ T1041] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 550.404915][ T1041] [ 550.404915][ T1041] Showing all locks held in the system: [ 550.412867][ T1041] 1 lock held by khungtaskd/1041: [ 550.417958][ T1041] #0: 000000003eb5124f (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 550.427827][ T1041] 2 locks held by rsyslogd/7814: [ 550.432816][ T1041] #0: 000000006a1eeab3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 550.442431][ T1041] #1: 00000000b80b53a8 (&rq->lock){-.-.}, at: __schedule+0x1fc/0x1cc0 [ 550.450889][ T1041] 2 locks held by getty/7936: [ 550.455732][ T1041] #0: 00000000bdba5439 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.465107][ T1041] #1: 000000005ba28175 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.475654][ T1041] 2 locks held by getty/7937: [ 550.480499][ T1041] #0: 0000000061657b31 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.490680][ T1041] #1: 000000001cc8a7c5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.500420][ T1041] 2 locks held by getty/7938: [ 550.505088][ T1041] #0: 00000000c91bbc46 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.514502][ T1041] #1: 00000000c0cf9919 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.524162][ T1041] 2 locks held by getty/7939: [ 550.528898][ T1041] #0: 0000000036d74fbf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.537870][ T1041] #1: 000000002027d065 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.547658][ T1041] 2 locks held by getty/7940: [ 550.552691][ T1041] #0: 0000000089d5b9da (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.561807][ T1041] #1: 0000000005e858ef (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.571754][ T1041] 2 locks held by getty/7941: [ 550.576581][ T1041] #0: 0000000056b8bc10 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.585915][ T1041] #1: 000000005248707f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.595999][ T1041] 2 locks held by getty/7942: [ 550.600920][ T1041] #0: 000000003393f3e5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 550.610393][ T1041] #1: 00000000186b825d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 550.620146][ T1041] [ 550.622619][ T1041] ============================================= [ 550.622619][ T1041] [ 550.631985][ T1041] NMI backtrace for cpu 0 [ 550.636312][ T1041] CPU: 0 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc3+ #55 [ 550.643956][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 550.654135][ T1041] Call Trace: [ 550.657665][ T1041] dump_stack+0x172/0x1f0 [ 550.662195][ T1041] nmi_cpu_backtrace.cold+0x63/0xa4 [ 550.667869][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 550.673631][ T1041] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 550.679936][ T1041] arch_trigger_cpumask_backtrace+0x14/0x20 [ 550.685966][ T1041] watchdog+0x9b7/0xec0 [ 550.690304][ T1041] kthread+0x357/0x430 [ 550.694367][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 550.699910][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 550.706405][ T1041] ret_from_fork+0x3a/0x50 [ 550.711049][ T1041] Sending NMI from CPU 0 to CPUs 1: [ 550.716448][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x2/0x10 [ 550.717364][ T1041] Kernel panic - not syncing: hung_task: blocked tasks [ 550.731815][ T1041] CPU: 0 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc3+ #55 [ 550.739481][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 550.749634][ T1041] Call Trace: [ 550.753149][ T1041] dump_stack+0x172/0x1f0 [ 550.757584][ T1041] panic+0x2cb/0x65c [ 550.761638][ T1041] ? __warn_printk+0xf3/0xf3 [ 550.766515][ T1041] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 550.772692][ T1041] ? printk_safe_flush+0xf2/0x140 [ 550.777833][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 550.784091][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 550.789839][ T1041] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 550.796597][ T1041] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 550.803051][ T1041] watchdog+0x9c8/0xec0 [ 550.807417][ T1041] kthread+0x357/0x430 [ 550.811600][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 550.817231][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 550.823870][ T1041] ret_from_fork+0x3a/0x50 [ 550.829800][ T1041] Kernel Offset: disabled [ 550.834136][ T1041] Rebooting in 86400 seconds..