[ 59.121863][ T23] audit: type=1800 audit(1575127201.060:25): pid=8787 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.141966][ T23] audit: type=1800 audit(1575127201.060:26): pid=8787 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.202971][ T23] audit: type=1800 audit(1575127201.060:27): pid=8787 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. [ 59.812829][ T8851] sshd (8851) used greatest stack depth: 22888 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.170' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 382.160930][ T1102] INFO: task syz-executor442:8938 blocked for more than 143 seconds. [ 382.169132][ T1102] Not tainted 5.4.0-syzkaller #0 [ 382.174675][ T1102] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 382.183406][ T1102] syz-executor442 D28056 8938 8936 0x00000000 [ 382.189727][ T1102] Call Trace: [ 382.193312][ T1102] __schedule+0x8e1/0x1f30 [ 382.197741][ T1102] ? __sched_text_start+0x8/0x8 [ 382.202734][ T1102] ? lockdep_hardirqs_on+0x421/0x5e0 [ 382.208100][ T1102] ? __lock_sock+0x160/0x290 [ 382.212786][ T1102] ? trace_hardirqs_on+0x67/0x240 [ 382.217826][ T1102] schedule+0xdc/0x2b0 [ 382.222048][ T1102] __lock_sock+0x165/0x290 [ 382.226473][ T1102] ? __sk_dst_check+0x2e0/0x2e0 [ 382.231441][ T1102] ? finish_wait+0x260/0x260 [ 382.236039][ T1102] lock_sock_nested+0xfe/0x120 [ 382.240915][ T1102] virtio_transport_release+0xc4/0xd50 [ 382.246930][ T1102] ? virtio_transport_close_timeout+0x220/0x220 [ 382.253273][ T1102] ? rcu_read_lock_held+0x9c/0xb0 [ 382.258358][ T1102] ? __kasan_check_read+0x11/0x20 [ 382.263445][ T1102] vsock_assign_transport+0xea/0x330 [ 382.268725][ T1102] vsock_stream_connect+0x2b3/0xc70 [ 382.274021][ T1102] ? tomoyo_socket_listen_permission+0x3b0/0x3b0 [ 382.280348][ T1102] ? vsock_dgram_connect+0x470/0x470 [ 382.285675][ T1102] ? finish_wait+0x260/0x260 [ 382.290290][ T1102] ? apparmor_socket_connect+0xb6/0x160 [ 382.295968][ T1102] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 382.302243][ T1102] __sys_connect_file+0x25d/0x2e0 [ 382.307245][ T1102] ? __ia32_sys_accept+0xb0/0xb0 [ 382.312225][ T1102] ? __kasan_check_write+0x14/0x20 [ 382.317336][ T1102] ? down_read_non_owner+0x490/0x490 [ 382.322680][ T1102] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 382.328913][ T1102] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 382.335251][ T1102] ? __fget_light+0x1a9/0x230 [ 382.339939][ T1102] __sys_connect+0x51/0x90 [ 382.344389][ T1102] __x64_sys_connect+0x73/0xb0 [ 382.349166][ T1102] do_syscall_64+0xfa/0x790 [ 382.353733][ T1102] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 382.359622][ T1102] RIP: 0033:0x4401b9 [ 382.363580][ T1102] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 382.383237][ T1102] RSP: 002b:00007ffc26a1c248 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 382.391719][ T1102] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [ 382.399698][ T1102] RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003 [ 382.408002][ T1102] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 382.416096][ T1102] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 382.424114][ T1102] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 382.432131][ T1102] [ 382.432131][ T1102] Showing all locks held in the system: [ 382.439849][ T1102] 1 lock held by khungtaskd/1102: [ 382.444931][ T1102] #0: ffffffff895a4080 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 382.454298][ T1102] 1 lock held by rsyslogd/8825: [ 382.459119][ T1102] #0: ffff8880a4685160 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 382.467788][ T1102] 2 locks held by getty/8915: [ 382.472489][ T1102] #0: ffff8880a6274090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.481562][ T1102] #1: ffffc90005f512e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.491247][ T1102] 2 locks held by getty/8916: [ 382.495898][ T1102] #0: ffff8880911c9090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.504894][ T1102] #1: ffffc90005f772e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.514512][ T1102] 2 locks held by getty/8917: [ 382.519171][ T1102] #0: ffff88809caeb090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.528174][ T1102] #1: ffffc90005f6b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.537784][ T1102] 2 locks held by getty/8918: [ 382.542493][ T1102] #0: ffff8880a1e0a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.551491][ T1102] #1: ffffc90005f5d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.561111][ T1102] 2 locks held by getty/8919: [ 382.565786][ T1102] #0: ffff8880a1331090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.574775][ T1102] #1: ffffc90005f732e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.584462][ T1102] 2 locks held by getty/8920: [ 382.589199][ T1102] #0: ffff88809bfaf090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.598170][ T1102] #1: ffffc90005f6f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.607767][ T1102] 2 locks held by getty/8921: [ 382.612627][ T1102] #0: ffff88809ae28090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 382.621984][ T1102] #1: ffffc90005f452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 382.631593][ T1102] 1 lock held by syz-executor442/8938: [ 382.637026][ T1102] #0: ffff8880a71068d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70 [ 382.647104][ T1102] [ 382.649426][ T1102] ============================================= [ 382.649426][ T1102] [ 382.657870][ T1102] NMI backtrace for cpu 0 [ 382.662243][ T1102] CPU: 0 PID: 1102 Comm: khungtaskd Not tainted 5.4.0-syzkaller #0 [ 382.670108][ T1102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 382.680148][ T1102] Call Trace: [ 382.683473][ T1102] dump_stack+0x197/0x210 [ 382.687783][ T1102] nmi_cpu_backtrace.cold+0x70/0xb2 [ 382.692986][ T1102] ? vprintk_func+0x86/0x189 [ 382.697603][ T1102] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 382.703561][ T1102] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 382.709521][ T1102] arch_trigger_cpumask_backtrace+0x14/0x20 [ 382.715391][ T1102] watchdog+0xb11/0x10c0 [ 382.719901][ T1102] kthread+0x361/0x430 [ 382.723950][ T1102] ? reset_hung_task_detector+0x30/0x30 [ 382.729479][ T1102] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 382.735285][ T1102] ret_from_fork+0x24/0x30 [ 382.739805][ T1102] Sending NMI from CPU 0 to CPUs 1: [ 382.745121][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 382.746063][ T1102] Kernel panic - not syncing: hung_task: blocked tasks [ 382.760198][ T1102] CPU: 0 PID: 1102 Comm: khungtaskd Not tainted 5.4.0-syzkaller #0 [ 382.768087][ T1102] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 382.778123][ T1102] Call Trace: [ 382.781414][ T1102] dump_stack+0x197/0x210 [ 382.785790][ T1102] panic+0x2e3/0x75c [ 382.789753][ T1102] ? add_taint.cold+0x16/0x16 [ 382.794434][ T1102] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 382.800132][ T1102] ? printk_safe_flush+0xf2/0x140 [ 382.805146][ T1102] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 382.811365][ T1102] ? nmi_trigger_cpumask_backtrace+0x224/0x28b [ 382.817513][ T1102] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 382.824524][ T1102] watchdog+0xb22/0x10c0 [ 382.828760][ T1102] kthread+0x361/0x430 [ 382.832807][ T1102] ? reset_hung_task_detector+0x30/0x30 [ 382.838330][ T1102] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 382.844037][ T1102] ret_from_fork+0x24/0x30 [ 382.849331][ T1102] Kernel Offset: disabled [ 382.853666][ T1102] Rebooting in 86400 seconds..