[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.049766][ T26] audit: type=1800 audit(1555335702.880:25): pid=7913 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.089634][ T26] audit: type=1800 audit(1555335702.880:26): pid=7913 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 42.115121][ T26] audit: type=1800 audit(1555335702.880:27): pid=7913 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 386.018510][ T1042] INFO: task syz-executor043:8083 blocked for more than 143 seconds. [ 386.026878][ T1042] Not tainted 5.1.0-rc5 #68 [ 386.032157][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 386.040952][ T1042] syz-executor043 D29912 8083 8063 0x20020004 [ 386.047705][ T1042] Call Trace: [ 386.051450][ T1042] __schedule+0x813/0x1cc0 [ 386.055957][ T1042] ? lock_downgrade+0x880/0x880 [ 386.061105][ T1042] ? __sched_text_start+0x8/0x8 [ 386.065985][ T1042] ? __lock_acquire+0x548/0x3fb0 [ 386.071073][ T1042] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 386.076914][ T1042] schedule+0x92/0x180 [ 386.081122][ T1042] schedule_timeout+0x8ca/0xfd0 [ 386.086047][ T1042] ? wait_for_completion+0x294/0x440 [ 386.091516][ T1042] ? find_held_lock+0x35/0x130 [ 386.096309][ T1042] ? usleep_range+0x170/0x170 [ 386.101134][ T1042] ? mark_held_locks+0xa4/0xf0 [ 386.105924][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 386.111359][ T1042] ? wait_for_completion+0x294/0x440 [ 386.116962][ T1042] ? _raw_spin_unlock_irq+0x28/0x90 [ 386.122389][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 386.127746][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 386.133448][ T1042] ? kasan_check_read+0x11/0x20 [ 386.138578][ T1042] wait_for_completion+0x29c/0x440 [ 386.143717][ T1042] ? wait_for_completion_interruptible+0x4b0/0x4b0 [ 386.150521][ T1042] ? wake_up_q+0xf0/0xf0 [ 386.154866][ T1042] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 386.160928][ T1042] ? percpu_ref_kill_and_confirm+0x1b7/0x3b0 [ 386.166970][ T1042] __io_uring_register+0xb6/0x1fd0 [ 386.172230][ T1042] ? __mutex_lock+0x3cd/0x1310 [ 386.177136][ T1042] ? __ia32_sys_io_uring_register+0x182/0x1f0 [ 386.183387][ T1042] ? io_sq_wq_submit_work+0x10f0/0x10f0 [ 386.189078][ T1042] ? __ia32_sys_futex_time32+0x369/0x4cf [ 386.194811][ T1042] __ia32_sys_io_uring_register+0x193/0x1f0 [ 386.201028][ T1042] do_fast_syscall_32+0x281/0xc98 [ 386.206172][ T1042] entry_SYSENTER_compat+0x70/0x7f [ 386.211429][ T1042] RIP: 0023:0xf7f06869 [ 386.218121][ T1042] Code: Bad RIP value. [ 386.222336][ T1042] RSP: 002b:00000000f7f021ec EFLAGS: 00000296 ORIG_RAX: 00000000000001ab [ 386.230946][ T1042] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000001 [ 386.239300][ T1042] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000014a [ 386.247303][ T1042] RBP: 00000000200000c0 R08: 0000000000000000 R09: 0000000000000000 [ 386.255467][ T1042] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 386.264037][ T1042] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 386.272365][ T1042] INFO: task syz-executor043:8084 blocked for more than 143 seconds. [ 386.280562][ T1042] Not tainted 5.1.0-rc5 #68 [ 386.285594][ T1042] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 386.294381][ T1042] syz-executor043 D30320 8084 8063 0x20020004 [ 386.300818][ T1042] Call Trace: [ 386.304160][ T1042] __schedule+0x813/0x1cc0 [ 386.308715][ T1042] ? __mutex_lock+0x721/0x1310 [ 386.313523][ T1042] ? __sched_text_start+0x8/0x8 [ 386.318539][ T1042] schedule+0x92/0x180 [ 386.322635][ T1042] schedule_preempt_disabled+0x13/0x20 [ 386.328111][ T1042] __mutex_lock+0x726/0x1310 [ 386.332850][ T1042] ? __ia32_sys_io_uring_enter+0x67f/0xac0 [ 386.338779][ T1042] ? mutex_trylock+0x1e0/0x1e0 [ 386.343567][ T1042] ? __ia32_sys_io_uring_enter+0x35a/0xac0 [ 386.349519][ T1042] ? lock_downgrade+0x880/0x880 [ 386.354406][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 386.361098][ T1042] mutex_lock_nested+0x16/0x20 [ 386.366018][ T1042] ? mutex_lock_nested+0x16/0x20 [ 386.371083][ T1042] __ia32_sys_io_uring_enter+0x67f/0xac0 [ 386.376741][ T1042] ? __x64_sys_io_uring_enter+0xac0/0xac0 [ 386.382688][ T1042] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 386.388312][ T1042] ? do_fast_syscall_32+0xd1/0xc98 [ 386.393445][ T1042] ? entry_SYSENTER_compat+0x70/0x7f [ 386.398863][ T1042] ? do_fast_syscall_32+0xd1/0xc98 [ 386.403998][ T1042] ? lockdep_hardirqs_on+0x418/0x5d0 [ 386.409965][ T1042] ? trace_hardirqs_on+0x67/0x230 [ 386.415040][ T1042] do_fast_syscall_32+0x281/0xc98 [ 386.420325][ T1042] entry_SYSENTER_compat+0x70/0x7f [ 386.425480][ T1042] RIP: 0023:0xf7f06869 [ 386.429716][ T1042] Code: Bad RIP value. [ 386.433837][ T1042] RSP: 002b:00000000f7ee11ec EFLAGS: 00000292 ORIG_RAX: 00000000000001aa [ 386.442565][ T1042] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000010005 [ 386.451316][ T1042] RDX: 0000000000000002 RSI: 0000000000000003 RDI: 0000000000000000 [ 386.459638][ T1042] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 386.467899][ T1042] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 386.475999][ T1042] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 386.484187][ T1042] [ 386.484187][ T1042] Showing all locks held in the system: [ 386.492106][ T1042] 1 lock held by khungtaskd/1042: [ 386.497151][ T1042] #0: 00000000fbdbf33e (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 386.506679][ T1042] 2 locks held by rsyslogd/7952: [ 386.511687][ T1042] #0: 000000001bb2c5a7 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 386.520532][ T1042] #1: 000000007392ce44 (fs_reclaim){+.+.}, at: is_bpf_text_address+0x0/0x170 [ 386.529667][ T1042] 2 locks held by getty/8041: [ 386.534348][ T1042] #0: 00000000e7d67802 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.543695][ T1042] #1: 0000000026520570 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.553603][ T1042] 2 locks held by getty/8042: [ 386.558396][ T1042] #0: 000000004426012c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.567364][ T1042] #1: 0000000004c02a9e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.577487][ T1042] 2 locks held by getty/8043: [ 386.582253][ T1042] #0: 00000000e0209856 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.593780][ T1042] #1: 000000009f921bda (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.603544][ T1042] 2 locks held by getty/8044: [ 386.608319][ T1042] #0: 0000000000de2ea5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.617420][ T1042] #1: 000000002674bf52 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.627612][ T1042] 2 locks held by getty/8045: [ 386.632362][ T1042] #0: 00000000abbba1ef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.641437][ T1042] #1: 00000000ef32475e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.651107][ T1042] 2 locks held by getty/8046: [ 386.655850][ T1042] #0: 000000008d742c83 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.665406][ T1042] #1: 00000000fa255b8a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.675273][ T1042] 2 locks held by getty/8047: [ 386.680838][ T1042] #0: 00000000d3d56b2b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 386.690020][ T1042] #1: 0000000015242045 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 [ 386.699797][ T1042] 1 lock held by syz-executor043/8083: [ 386.705281][ T1042] #0: 000000005524ed18 (&ctx->uring_lock){+.+.}, at: __ia32_sys_io_uring_register+0x182/0x1f0 [ 386.715997][ T1042] 1 lock held by syz-executor043/8084: [ 386.721553][ T1042] #0: 000000005524ed18 (&ctx->uring_lock){+.+.}, at: __ia32_sys_io_uring_enter+0x67f/0xac0 [ 386.731762][ T1042] [ 386.734107][ T1042] ============================================= [ 386.734107][ T1042] [ 386.742684][ T1042] NMI backtrace for cpu 1 [ 386.747036][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc5 #68 [ 386.754522][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 386.764694][ T1042] Call Trace: [ 386.767999][ T1042] dump_stack+0x172/0x1f0 [ 386.772412][ T1042] nmi_cpu_backtrace.cold+0x63/0xa4 [ 386.777653][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 386.783304][ T1042] nmi_trigger_cpumask_backtrace+0x1be/0x236 [ 386.789449][ T1042] arch_trigger_cpumask_backtrace+0x14/0x20 [ 386.795804][ T1042] watchdog+0x9b7/0xec0 [ 386.800089][ T1042] kthread+0x357/0x430 [ 386.804219][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 386.809786][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 386.816155][ T1042] ret_from_fork+0x3a/0x50 [ 386.821878][ T1042] Sending NMI from CPU 1 to CPUs 0: [ 386.827278][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 [ 386.828131][ T1042] Kernel panic - not syncing: hung_task: blocked tasks [ 386.843155][ T1042] CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc5 #68 [ 386.850608][ T1042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 386.860893][ T1042] Call Trace: [ 386.864294][ T1042] dump_stack+0x172/0x1f0 [ 386.868731][ T1042] panic+0x2cb/0x65c [ 386.872659][ T1042] ? __warn_printk+0xf3/0xf3 [ 386.877282][ T1042] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 386.883079][ T1042] ? printk_safe_flush+0xf2/0x140 [ 386.888822][ T1042] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 386.895131][ T1042] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 386.900810][ T1042] ? nmi_trigger_cpumask_backtrace+0x1a7/0x236 [ 386.907219][ T1042] ? nmi_trigger_cpumask_backtrace+0x19e/0x236 [ 386.913401][ T1042] watchdog+0x9c8/0xec0 [ 386.917573][ T1042] kthread+0x357/0x430 [ 386.922415][ T1042] ? reset_hung_task_detector+0x30/0x30 [ 386.928158][ T1042] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 386.934964][ T1042] ret_from_fork+0x3a/0x50 [ 386.940483][ T1042] Kernel Offset: disabled [ 386.944893][ T1042] Rebooting in 86400 seconds..