[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 59.798945][ T25] audit: type=1800 audit(1575095828.741:25): pid=8851 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0
[ 59.818897][ T25] audit: type=1800 audit(1575095828.741:26): pid=8851 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0
[ 59.855453][ T25] audit: type=1800 audit(1575095828.741:27): pid=8851 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.15.210' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 526.225356][ T890] INFO: task syz-executor171:9003 blocked for more than 143 seconds.
[ 526.233687][ T890] Not tainted 5.4.0-syzkaller #0
[ 526.240270][ T890] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 526.249171][ T890] syz-executor171 D28056 9003 9001 0x00000000
[ 526.255561][ T890] Call Trace:
[ 526.258943][ T890] __schedule+0x8e1/0x1f30
[ 526.263367][ T890] ? __sched_text_start+0x8/0x8
[ 526.268340][ T890] ? lockdep_hardirqs_on+0x421/0x5e0
[ 526.273702][ T890] ? __lock_sock+0x160/0x290
[ 526.278552][ T890] ? trace_hardirqs_on+0x67/0x240
[ 526.283596][ T890] schedule+0xdc/0x2b0
[ 526.287727][ T890] __lock_sock+0x165/0x290
[ 526.292151][ T890] ? __sk_dst_check+0x2e0/0x2e0
[ 526.297096][ T890] ? finish_wait+0x260/0x260
[ 526.301710][ T890] lock_sock_nested+0xfe/0x120
[ 526.306614][ T890] virtio_transport_release+0xc4/0xd50
[ 526.312264][ T890] ? virtio_transport_close_timeout+0x220/0x220
[ 526.318610][ T890] ? rcu_read_lock_held+0x9c/0xb0
[ 526.323738][ T890] ? __kasan_check_read+0x11/0x20
[ 526.328846][ T890] vsock_assign_transport+0xea/0x330
[ 526.334256][ T890] vsock_stream_connect+0x2b3/0xc70
[ 526.339609][ T890] ? tomoyo_socket_listen_permission+0x3b0/0x3b0
[ 526.345975][ T890] ? vsock_dgram_connect+0x470/0x470
[ 526.351252][ T890] ? finish_wait+0x260/0x260
[ 526.355956][ T890] ? apparmor_socket_connect+0xb6/0x160
[ 526.361558][ T890] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 526.367874][ T890] __sys_connect_file+0x25d/0x2e0
[ 526.372908][ T890] ? __ia32_sys_accept+0xb0/0xb0
[ 526.377902][ T890] ? __kasan_check_write+0x14/0x20
[ 526.383023][ T890] ? down_read_non_owner+0x490/0x490
[ 526.388373][ T890] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[ 526.394620][ T890] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[ 526.400981][ T890] ? __fget_light+0x1a9/0x230
[ 526.405695][ T890] __sys_connect+0x51/0x90
[ 526.410105][ T890] __x64_sys_connect+0x73/0xb0
[ 526.414874][ T890] do_syscall_64+0xfa/0x790
[ 526.419560][ T890] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 526.425652][ T890] RIP: 0033:0x4401b9
[ 526.429546][ T890] Code: Bad RIP value.
[ 526.433601][ T890] RSP: 002b:00007ffc961fdf58 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
[ 526.442092][ T890] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9
[ 526.450120][ T890] RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003
[ 526.458224][ T890] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
[ 526.466240][ T890] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40
[ 526.474201][ T890] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000
[ 526.482353][ T890]
[ 526.482353][ T890] Showing all locks held in the system:
[ 526.490291][ T890] 1 lock held by khungtaskd/890:
[ 526.495254][ T890] #0: ffffffff895a4080 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279
[ 526.504625][ T890] 1 lock held by rsyslogd/8889:
[ 526.509556][ T890] 2 locks held by getty/8979:
[ 526.514224][ T890] #0: ffff8880a0a25090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.523235][ T890] #1: ffffc90005f5d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.532946][ T890] 2 locks held by getty/8980:
[ 526.537646][ T890] #0: ffff8880a17d6090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.546640][ T890] #1: ffffc90005f412e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.556239][ T890] 2 locks held by getty/8981:
[ 526.560922][ T890] #0: ffff888091450090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.570867][ T890] #1: ffffc90005f672e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.580476][ T890] 2 locks held by getty/8982:
[ 526.585181][ T890] #0: ffff8880a711c090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.594134][ T890] #1: ffffc90005f552e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.603738][ T890] 2 locks held by getty/8983:
[ 526.608443][ T890] #0: ffff888095ad5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.617434][ T890] #1: ffffc90005f512e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.627038][ T890] 2 locks held by getty/8984:
[ 526.631699][ T890] #0: ffff8880a363d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.640686][ T890] #1: ffffc90005f632e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.650286][ T890] 2 locks held by getty/8985:
[ 526.654938][ T890] #0: ffff88809a3c5090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40
[ 526.663969][ T890] #1: ffffc90005f352e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1c10
[ 526.673612][ T890] 1 lock held by syz-executor171/9003:
[ 526.679103][ T890] #0: ffff8880a5ce48d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70
[ 526.688752][ T890]
[ 526.691075][ T890] =============================================
[ 526.691075][ T890]
[ 526.699726][ T890] NMI backtrace for cpu 0
[ 526.704064][ T890] CPU: 0 PID: 890 Comm: khungtaskd Not tainted 5.4.0-syzkaller #0
[ 526.711876][ T890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 526.722054][ T890] Call Trace:
[ 526.725416][ T890] dump_stack+0x197/0x210
[ 526.729747][ T890] nmi_cpu_backtrace.cold+0x70/0xb2
[ 526.735185][ T890] ? vprintk_func+0x86/0x189
[ 526.739840][ T890] ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[ 526.746009][ T890] nmi_trigger_cpumask_backtrace+0x23b/0x28b
[ 526.751978][ T890] arch_trigger_cpumask_backtrace+0x14/0x20
[ 526.757855][ T890] watchdog+0xb11/0x10c0
[ 526.762134][ T890] kthread+0x361/0x430
[ 526.766195][ T890] ? reset_hung_task_detector+0x30/0x30
[ 526.771722][ T890] ? kthread_mod_delayed_work+0x1f0/0x1f0
[ 526.777453][ T890] ret_from_fork+0x24/0x30
[ 526.782033][ T890] Sending NMI from CPU 0 to CPUs 1:
[ 526.787793][ C1] NMI backtrace for cpu 1
[ 526.787798][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-syzkaller #0
[ 526.787804][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 526.787808][ C1] RIP: 0010:_nohz_idle_balance+0x95/0x3f0
[ 526.787818][ C1] Code: fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 65 03 00 00 c7 05 a2 6a 22 09 00 00 00 00 48 8b 44 24 28 8b 80 c8 0a 00 00 <89> 44 24 54 f0 83 44 24 fc 00 65 48 8b 04 25 c0 1e 02 00 48 89 44
[ 526.787822][ C1] RSP: 0018:ffff8880ae909e08 EFLAGS: 00000246
[ 526.787830][ C1] RAX: 0000000000000001 RBX: ffff8880ae937380 RCX: ffffffff8155710b
[ 526.787835][ C1] RDX: 1ffff11015d26fc9 RSI: 0000000000000003 RDI: ffff8880ae937e48
[ 526.787839][ C1] RBP: ffff8880ae909e88 R08: 1ffff11015d26e7c R09: ffffed1015d26e7d
[ 526.787844][ C1] R10: ffffed1015d26e7c R11: ffff8880ae9373e3 R12: ffff8880ae937380
[ 526.787849][ C1] R13: ffff8880ae937e48 R14: 0000000000000001 R15: ffff8880ae9373e0
[ 526.787854][ C1] FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
[ 526.787858][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 526.787862][ C1] CR2: ffffffffff600400 CR3: 000000009d25f000 CR4: 00000000001406e0
[ 526.787867][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 526.787872][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 526.787874][ C1] Call Trace:
[ 526.787876][ C1]
[ 526.787880][ C1] run_rebalance_domains+0x1c6/0x2d0
[ 526.787883][ C1] __do_softirq+0x262/0x98c
[ 526.787886][ C1] ? sched_clock_cpu+0x1b/0x1b0
[ 526.787889][ C1] irq_exit+0x19b/0x1e0
[ 526.787892][ C1] scheduler_ipi+0x3ae/0x640
[ 526.787896][ C1] ? trace_hardirqs_off_thunk+0x1a/0x1c
[ 526.787900][ C1] smp_reschedule_interrupt+0x78/0x4c0
[ 526.787903][ C1] reschedule_interrupt+0xf/0x20
[ 526.787905][ C1]
[ 526.787909][ C1] RIP: 0010:native_safe_halt+0xe/0x10
[ 526.787919][ C1] Code: e8 14 f8 f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d f4 7d 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d e4 7d 4e 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 ae 78 a8 f9 e8 89
[ 526.787922][ C1] RSP: 0018:ffff8880a98dfd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02
[ 526.787931][ C1] RAX: 1ffffffff12a668e RBX: ffff8880a98ce340 RCX: 0000000000000000
[ 526.787935][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a98cebd4
[ 526.787940][ C1] RBP: ffff8880a98dfd98 R08: ffff8880a98ce340 R09: 0000000000000000
[ 526.787944][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
[ 526.787949][ C1] R13: ffffffff8a36dd00 R14: 0000000000000000 R15: 0000000000000001
[ 526.787952][ C1] ? default_idle+0x4e/0x360
[ 526.787955][ C1] arch_cpu_idle+0xa/0x10
[ 526.787958][ C1] default_idle_call+0x84/0xb0
[ 526.787961][ C1] do_idle+0x3c8/0x6e0
[ 526.788004][ C1] ? arch_cpu_idle_exit+0x80/0x80
[ 526.788007][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0
[ 526.788011][ C1] ? complete+0x61/0x80
[ 526.788014][ C1] cpu_startup_entry+0x1b/0x20
[ 526.788017][ C1] start_secondary+0x2f4/0x410
[ 526.788021][ C1] ? set_cpu_sibling_map+0x2140/0x2140
[ 526.788024][ C1] secondary_startup_64+0xa4/0xb0
[ 526.788686][ T890] Kernel panic - not syncing: hung_task: blocked tasks
[ 527.103856][ T890] CPU: 0 PID: 890 Comm: khungtaskd Not tainted 5.4.0-syzkaller #0
[ 527.111633][ T890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 527.121666][ T890] Call Trace:
[ 527.125144][ T890] dump_stack+0x197/0x210
[ 527.129542][ T890] panic+0x2e3/0x75c
[ 527.133416][ T890] ? add_taint.cold+0x16/0x16
[ 527.138074][ T890] ? lapic_can_unplug_cpu.cold+0x3a/0x3a
[ 527.143686][ T890] ? ___preempt_schedule+0x16/0x18
[ 527.148865][ T890] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[ 527.155006][ T890] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b
[ 527.161137][ T890] ? nmi_trigger_cpumask_backtrace+0x256/0x28b
[ 527.167272][ T890] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b
[ 527.173451][ T890] watchdog+0xb22/0x10c0
[ 527.177697][ T890] kthread+0x361/0x430
[ 527.181751][ T890] ? reset_hung_task_detector+0x30/0x30
[ 527.187293][ T890] ? kthread_mod_delayed_work+0x1f0/0x1f0
[ 527.193004][ T890] ret_from_fork+0x24/0x30
[ 527.198956][ T890] Kernel Offset: disabled
[ 527.203351][ T890] Rebooting in 86400 seconds..