[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [ 39.858343][ T26] audit: type=1800 audit(1553454741.473:33): pid=7654 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 Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 44.246977][ T26] kauditd_printk_skb: 1 callbacks suppressed [ 44.246990][ T26] audit: type=1400 audit(1553454745.853:35): avc: denied { map } for pid=7830 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 [ 320.250716][ T26] audit: type=1400 audit(1553455021.863:36): avc: denied { map } for pid=7838 comm="sh" path="/bin/dash" dev="sda1" ino=1473 scontext=system_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.10.5' (ECDSA) to the list of known hosts. executing program [ 419.522928][ T26] audit: type=1400 audit(1553455121.133:37): avc: denied { map } for pid=7845 comm="syz-executor242" path="/root/syz-executor242417745" 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 [ 568.267661][ T1041] INFO: task syz-executor242:7845 blocked for more than 143 seconds. [ 568.276083][ T1041] Not tainted 5.1.0-rc1+ #35 [ 568.281301][ T1041] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 568.290014][ T1041] syz-executor242 D27832 7845 7843 0x80000000 [ 568.296344][ T1041] Call Trace: [ 568.299812][ T1041] __schedule+0x817/0x1cc0 [ 568.304254][ T1041] ? __sched_text_start+0x8/0x8 [ 568.309253][ T1041] ? __lock_acquire+0x242a/0x3fb0 [ 568.314283][ T1041] schedule+0x92/0x180 [ 568.318429][ T1041] schedule_timeout+0x8ca/0xfd0 [ 568.323281][ T1041] ? wait_for_completion+0x294/0x440 [ 568.328699][ T1041] ? find_held_lock+0x35/0x130 [ 568.333479][ T1041] ? usleep_range+0x170/0x170 [ 568.338317][ T1041] ? kasan_check_write+0x14/0x20 [ 568.343267][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 568.348513][ T1041] ? wait_for_completion+0x294/0x440 [ 568.353804][ T1041] ? _raw_spin_unlock_irq+0x28/0x90 [ 568.359108][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 568.364485][ T1041] ? trace_hardirqs_on+0x67/0x230 [ 568.369611][ T1041] ? kasan_check_read+0x11/0x20 [ 568.374467][ T1041] wait_for_completion+0x29c/0x440 [ 568.379652][ T1041] ? lockdep_hardirqs_on+0x418/0x5d0 [ 568.384954][ T1041] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 568.391625][ T1041] ? wake_up_q+0xf0/0xf0 [ 568.395906][ T1041] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 568.402010][ T1041] exit_aio+0x321/0x3a0 [ 568.406165][ T1041] ? io_submit_one+0x1cf0/0x1cf0 [ 568.411262][ T1041] ? mutex_unlock+0xd/0x10 [ 568.415728][ T1041] mmput+0xcf/0x4c0 [ 568.419619][ T1041] do_exit+0x816/0x2fa0 [ 568.423770][ T1041] ? lock_downgrade+0x880/0x880 [ 568.428698][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.434934][ T1041] ? kasan_check_read+0x11/0x20 [ 568.439839][ T1041] ? mm_update_next_owner+0x640/0x640 [ 568.445241][ T1041] ? __x64_sys_io_submit+0x37d/0x580 [ 568.451022][ T1041] ? __ia32_sys_io_destroy+0x420/0x420 [ 568.456492][ T1041] ? kasan_check_write+0x14/0x20 [ 568.461583][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 568.467052][ T1041] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 568.472573][ T1041] do_group_exit+0x135/0x370 [ 568.477270][ T1041] __x64_sys_exit_group+0x44/0x50 [ 568.482410][ T1041] do_syscall_64+0x103/0x610 [ 568.487069][ T1041] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 568.493018][ T1041] RIP: 0033:0x43ee48 [ 568.496912][ T1041] Code: Bad RIP value. [ 568.501180][ T1041] RSP: 002b:00007fff27280a98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 568.509631][ T1041] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ee48 [ 568.517779][ T1041] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 568.525815][ T1041] RBP: 00000000004be648 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 568.533973][ T1041] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 568.542029][ T1041] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 568.550055][ T1041] [ 568.550055][ T1041] Showing all locks held in the system: [ 568.557821][ T1041] 1 lock held by khungtaskd/1041: [ 568.562817][ T1041] #0: 00000000e78a2ef6 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 568.572389][ T1041] 1 lock held by rsyslogd/7694: [ 568.577236][ T1041] #0: 00000000976368c2 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 568.585953][ T1041] 2 locks held by getty/7815: [ 568.590649][ T1041] #0: 000000003c687d64 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.599637][ T1041] #1: 000000005335d78a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.609294][ T1041] 2 locks held by getty/7816: [ 568.614055][ T1041] #0: 000000008b552628 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.623267][ T1041] #1: 00000000e4eb0367 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.632885][ T1041] 2 locks held by getty/7817: [ 568.637632][ T1041] #0: 000000009370b669 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.646590][ T1041] #1: 0000000073542d88 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.656240][ T1041] 2 locks held by getty/7818: [ 568.661042][ T1041] #0: 000000005709ee2e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.670062][ T1041] #1: 00000000eef72285 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.679700][ T1041] 2 locks held by getty/7819: [ 568.684370][ T1041] #0: 000000007cc85652 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.693412][ T1041] #1: 00000000688a4980 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.703035][ T1041] 2 locks held by getty/7820: [ 568.707830][ T1041] #0: 0000000068b06fe5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.716803][ T1041] #1: 000000008ce2f329 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.726549][ T1041] 2 locks held by getty/7821: [ 568.731261][ T1041] #0: 00000000798496b7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 568.740354][ T1041] #1: 00000000f34412be (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 568.749995][ T1041] [ 568.752307][ T1041] ============================================= [ 568.752307][ T1041] [ 568.760799][ T1041] NMI backtrace for cpu 1 [ 568.765130][ T1041] CPU: 1 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc1+ #35 [ 568.772721][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.782779][ T1041] Call Trace: [ 568.786143][ T1041] dump_stack+0x172/0x1f0 [ 568.790572][ T1041] nmi_cpu_backtrace.cold+0x63/0xa4 [ 568.795823][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 568.801450][ T1041] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 568.807417][ T1041] arch_trigger_cpumask_backtrace+0x14/0x20 [ 568.813366][ T1041] watchdog+0x9b7/0xec0 [ 568.817573][ T1041] kthread+0x357/0x430 [ 568.821637][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 568.827172][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 568.833400][ T1041] ret_from_fork+0x3a/0x50 [ 568.837939][ T1041] Sending NMI from CPU 1 to CPUs 0: [ 568.843199][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 568.844139][ T1041] Kernel panic - not syncing: hung_task: blocked tasks [ 568.858267][ T1041] CPU: 1 PID: 1041 Comm: khungtaskd Not tainted 5.1.0-rc1+ #35 [ 568.865780][ T1041] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 568.875807][ T1041] Call Trace: [ 568.879235][ T1041] dump_stack+0x172/0x1f0 [ 568.883607][ T1041] panic+0x2cb/0x65c [ 568.887496][ T1041] ? __warn_printk+0xf3/0xf3 [ 568.892088][ T1041] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 568.897877][ T1041] ? printk_safe_flush+0xf2/0x140 [ 568.902935][ T1041] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 568.909253][ T1041] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 568.914877][ T1041] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 568.921027][ T1041] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 568.927278][ T1041] watchdog+0x9c8/0xec0 [ 568.931429][ T1041] kthread+0x357/0x430 [ 568.935475][ T1041] ? reset_hung_task_detector+0x30/0x30 [ 568.940996][ T1041] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 568.947215][ T1041] ret_from_fork+0x3a/0x50 [ 568.953041][ T1041] Kernel Offset: disabled [ 568.957412][ T1041] Rebooting in 86400 seconds..