[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 56.270574][ T26] audit: type=1800 audit(1574805262.172:25): pid=8562 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 56.292807][ T26] audit: type=1800 audit(1574805262.182:26): pid=8562 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 56.313444][ T26] audit: type=1800 audit(1574805262.182:27): pid=8562 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 '10.128.0.13' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 502.420833][ T1072] INFO: task syz-executor738:8715 blocked for more than 143 seconds. [ 502.429189][ T1072] Not tainted 5.4.0-rc8-syzkaller #0 [ 502.435086][ T1072] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 502.443796][ T1072] syz-executor738 D28056 8715 8713 0x00000000 [ 502.450109][ T1072] Call Trace: [ 502.453531][ T1072] __schedule+0x909/0x1ee0 [ 502.458060][ T1072] ? __sched_text_start+0x8/0x8 [ 502.462970][ T1072] ? lockdep_hardirqs_on+0x421/0x5e0 [ 502.468321][ T1072] ? __lock_sock+0x160/0x290 [ 502.472987][ T1072] ? trace_hardirqs_on+0x67/0x240 [ 502.478015][ T1072] schedule+0xd9/0x260 [ 502.482175][ T1072] __lock_sock+0x165/0x290 [ 502.486606][ T1072] ? __sk_dst_check+0x2e0/0x2e0 [ 502.491618][ T1072] ? finish_wait+0x260/0x260 [ 502.496228][ T1072] lock_sock_nested+0xfe/0x120 [ 502.501936][ T1072] virtio_transport_release+0xc4/0xcb0 [ 502.507402][ T1072] ? virtio_transport_close_timeout+0x130/0x130 [ 502.513730][ T1072] ? __local_bh_enable_ip+0x15a/0x270 [ 502.519134][ T1072] ? lock_sock_nested+0xe2/0x120 [ 502.524187][ T1072] ? __local_bh_enable_ip+0x15a/0x270 [ 502.529561][ T1072] ? lockdep_hardirqs_on+0x421/0x5e0 [ 502.534917][ T1072] ? lock_sock_nested+0x9a/0x120 [ 502.539860][ T1072] ? trace_hardirqs_on+0x67/0x240 [ 502.544929][ T1072] ? lock_sock_nested+0x9a/0x120 [ 502.549861][ T1072] vsock_assign_transport+0xea/0x330 [ 502.555200][ T1072] vsock_stream_connect+0x2b3/0xbe0 [ 502.560408][ T1072] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 502.566707][ T1072] ? vsock_dgram_connect+0x470/0x470 [ 502.572021][ T1072] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 502.577635][ T1072] ? finish_wait+0x260/0x260 [ 502.582259][ T1072] ? apparmor_socket_connect+0xb6/0x160 [ 502.587803][ T1072] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 502.594135][ T1072] __sys_connect+0x264/0x330 [ 502.598727][ T1072] ? __ia32_sys_accept+0xb0/0xb0 [ 502.603738][ T1072] ? up_read+0x1d2/0x810 [ 502.607982][ T1072] ? down_read_non_owner+0x490/0x490 [ 502.613334][ T1072] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 502.619624][ T1072] ? handle_mm_fault+0x4b0/0xaa0 [ 502.624665][ T1072] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 502.630141][ T1072] ? trace_hardirqs_on_thunk+0x1a/0x20 [ 502.636267][ T1072] ? do_syscall_64+0x26/0x760 [ 502.641295][ T1072] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 502.647379][ T1072] ? do_syscall_64+0x26/0x760 [ 502.652141][ T1072] __x64_sys_connect+0x73/0xb0 [ 502.656905][ T1072] do_syscall_64+0xfa/0x760 [ 502.661449][ T1072] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 502.667332][ T1072] RIP: 0033:0x4401b9 [ 502.671290][ T1072] Code: Bad RIP value. [ 502.675347][ T1072] RSP: 002b:00007ffd8d2a1808 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 502.683792][ T1072] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [ 502.691811][ T1072] RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000003 [ 502.699760][ T1072] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 502.707763][ T1072] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 502.715784][ T1072] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 502.723811][ T1072] [ 502.723811][ T1072] Showing all locks held in the system: [ 502.731572][ T1072] 1 lock held by khungtaskd/1072: [ 502.736569][ T1072] #0: ffffffff88fabb80 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e [ 502.745942][ T1072] 1 lock held by rsyslogd/8600: [ 502.750818][ T1072] #0: ffff88809c941e20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 502.759406][ T1072] 2 locks held by getty/8690: [ 502.764765][ T1072] #0: ffff8880a2190090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.773766][ T1072] #1: ffffc90005f152e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.783413][ T1072] 2 locks held by getty/8691: [ 502.788077][ T1072] #0: ffff8880a578b090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.797056][ T1072] #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.806643][ T1072] 2 locks held by getty/8692: [ 502.811345][ T1072] #0: ffff8880a9356090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.820282][ T1072] #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.829890][ T1072] 2 locks held by getty/8693: [ 502.834587][ T1072] #0: ffff8880a9246090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.843549][ T1072] #1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.853139][ T1072] 2 locks held by getty/8694: [ 502.857788][ T1072] #0: ffff8880a1e2a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.866752][ T1072] #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.876341][ T1072] 2 locks held by getty/8695: [ 502.881029][ T1072] #0: ffff8880a8557090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.889966][ T1072] #1: ffffc90005f392e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.900170][ T1072] 2 locks held by getty/8696: [ 502.904881][ T1072] #0: ffff8880a44bf090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 502.913861][ T1072] #1: ffffc90005f092e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10 [ 502.923456][ T1072] 1 lock held by syz-executor738/8715: [ 502.928898][ T1072] #0: ffff8880a76a58d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xbe0 [ 502.938502][ T1072] [ 502.940845][ T1072] ============================================= [ 502.940845][ T1072] [ 502.949232][ T1072] NMI backtrace for cpu 1 [ 502.953599][ T1072] CPU: 1 PID: 1072 Comm: khungtaskd Not tainted 5.4.0-rc8-syzkaller #0 [ 502.961818][ T1072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 502.971847][ T1072] Call Trace: [ 502.975189][ T1072] dump_stack+0x197/0x210 [ 502.979499][ T1072] nmi_cpu_backtrace.cold+0x70/0xb2 [ 502.984681][ T1072] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 502.990897][ T1072] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 502.996523][ T1072] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 503.002497][ T1072] arch_trigger_cpumask_backtrace+0x14/0x20 [ 503.008429][ T1072] watchdog+0x9d0/0xef0 [ 503.012581][ T1072] kthread+0x361/0x430 [ 503.016676][ T1072] ? reset_hung_task_detector+0x30/0x30 [ 503.022204][ T1072] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 503.027900][ T1072] ret_from_fork+0x24/0x30 [ 503.032462][ T1072] Sending NMI from CPU 1 to CPUs 0: [ 503.037730][ C0] NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0xe/0x10 [ 503.039456][ T1072] Kernel panic - not syncing: hung_task: blocked tasks [ 503.052812][ T1072] CPU: 1 PID: 1072 Comm: khungtaskd Not tainted 5.4.0-rc8-syzkaller #0 [ 503.061035][ T1072] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 503.071067][ T1072] Call Trace: [ 503.074338][ T1072] dump_stack+0x197/0x210 [ 503.078650][ T1072] panic+0x2e3/0x75c [ 503.082549][ T1072] ? add_taint.cold+0x16/0x16 [ 503.087224][ T1072] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 503.092849][ T1072] ? ___preempt_schedule+0x16/0x20 [ 503.097944][ T1072] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 503.104079][ T1072] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 503.110213][ T1072] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 503.116381][ T1072] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 503.122515][ T1072] watchdog+0x9e1/0xef0 [ 503.126654][ T1072] kthread+0x361/0x430 [ 503.130699][ T1072] ? reset_hung_task_detector+0x30/0x30 [ 503.136222][ T1072] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 503.141918][ T1072] ret_from_fork+0x24/0x30 [ 503.147761][ T1072] Kernel Offset: disabled [ 503.152093][ T1072] Rebooting in 86400 seconds..