[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 82.561024][ T27] audit: type=1800 audit(1582218178.066:25): pid=9399 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 82.581381][ T27] audit: type=1800 audit(1582218178.066:26): pid=9399 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 82.636583][ T27] audit: type=1800 audit(1582218178.076:27): pid=9399 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 syzkaller login: [ 85.630481][ T9540] sshd (9540) used greatest stack depth: 22776 bytes left Warning: Permanently added '10.128.0.227' (ECDSA) to the list of known hosts. executing program [ 548.546494][ T1136] INFO: task syz-executor760:9554 blocked for more than 143 seconds. [ 548.554793][ T1136] Not tainted 5.6.0-rc1-syzkaller #0 [ 548.560713][ T1136] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 548.569428][ T1136] syz-executor760 D28056 9554 9552 0x00000000 [ 548.575744][ T1136] Call Trace: [ 548.579241][ T1136] __schedule+0x934/0x1f90 [ 548.583702][ T1136] ? __sched_text_start+0x8/0x8 [ 548.588671][ T1136] ? lockdep_hardirqs_on+0x421/0x5e0 [ 548.594033][ T1136] ? __lock_sock+0x160/0x290 [ 548.598737][ T1136] ? trace_hardirqs_on+0x67/0x240 [ 548.603847][ T1136] schedule+0xdc/0x2b0 [ 548.607974][ T1136] __lock_sock+0x165/0x290 [ 548.612449][ T1136] ? __sk_dst_check+0x2e0/0x2e0 [ 548.617391][ T1136] ? finish_wait+0x260/0x260 [ 548.622045][ T1136] lock_sock_nested+0xfe/0x120 [ 548.627382][ T1136] virtio_transport_release+0xc4/0xd60 [ 548.632890][ T1136] ? virtio_transport_close_timeout+0x220/0x220 [ 548.639244][ T1136] ? rcu_read_lock_held+0x9c/0xb0 [ 548.644341][ T1136] ? __kasan_check_read+0x11/0x20 [ 548.649440][ T1136] vsock_assign_transport+0xf3/0x3b0 [ 548.655003][ T1136] vsock_stream_connect+0x2b3/0xc70 [ 548.660310][ T1136] ? tomoyo_socket_listen_permission+0x3b0/0x3b0 [ 548.666685][ T1136] ? vsock_dgram_connect+0x470/0x470 [ 548.671965][ T1136] ? finish_wait+0x260/0x260 [ 548.676605][ T1136] ? apparmor_socket_connect+0xb6/0x160 [ 548.682228][ T1136] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 548.688608][ T1136] __sys_connect_file+0x161/0x1c0 [ 548.693642][ T1136] ? move_addr_to_kernel.part.0+0xcd/0x110 [ 548.699490][ T1136] __sys_connect+0x174/0x1b0 [ 548.704084][ T1136] ? __sys_connect_file+0x1c0/0x1c0 [ 548.709343][ T1136] ? up_read+0x1cd/0x810 [ 548.713642][ T1136] ? down_read_non_owner+0x490/0x490 [ 548.719051][ T1136] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 548.724585][ T1136] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 548.730122][ T1136] ? do_syscall_64+0x26/0x790 [ 548.734805][ T1136] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 548.740928][ T1136] ? do_syscall_64+0x26/0x790 [ 548.745613][ T1136] __x64_sys_connect+0x73/0xb0 [ 548.750474][ T1136] do_syscall_64+0xfa/0x790 [ 548.754985][ T1136] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 548.760926][ T1136] RIP: 0033:0x4401b9 [ 548.764818][ T1136] 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 [ 548.784496][ T1136] RSP: 002b:00007fff7d720dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 548.792992][ T1136] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [ 548.801039][ T1136] RDX: 0000000000000010 RSI: 0000000020000440 RDI: 0000000000000003 [ 548.809047][ T1136] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 548.817073][ T1136] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 548.825044][ T1136] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 548.833112][ T1136] [ 548.833112][ T1136] Showing all locks held in the system: [ 548.840886][ T1136] 1 lock held by khungtaskd/1136: [ 548.845890][ T1136] #0: ffffffff89bac240 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 548.855286][ T1136] 1 lock held by rsyslogd/9437: [ 548.860161][ T1136] #0: ffff88808d7b4e20 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 548.868878][ T1136] 2 locks held by getty/9527: [ 548.873588][ T1136] #0: ffff88809871d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 548.882592][ T1136] #1: ffffc90005b0b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 548.892238][ T1136] 2 locks held by getty/9528: [ 548.896940][ T1136] #0: ffff8880a6a54090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 548.905891][ T1136] #1: ffffc90005b342e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 548.915493][ T1136] 2 locks held by getty/9529: [ 548.920193][ T1136] #0: ffff888096d53090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 548.929160][ T1136] #1: ffffc90005abb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 548.938763][ T1136] 2 locks held by getty/9530: [ 548.943411][ T1136] #0: ffff88809d0d7090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 548.952391][ T1136] #1: ffffc90005b172e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 548.961980][ T1136] 2 locks held by getty/9531: [ 548.966674][ T1136] #0: ffff88809763a090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 548.975618][ T1136] #1: ffffc90005b1b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 548.985251][ T1136] 2 locks held by getty/9532: [ 548.989957][ T1136] #0: ffff888097b73090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 548.998939][ T1136] #1: ffffc90005adb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 549.008540][ T1136] 2 locks held by getty/9533: [ 549.013195][ T1136] #0: ffff888096c47090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 549.022216][ T1136] #1: ffffc90005a9b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 549.031943][ T1136] 1 lock held by syz-executor760/9554: [ 549.037615][ T1136] #0: ffff88809ea578d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70 [ 549.047246][ T1136] [ 549.049574][ T1136] ============================================= [ 549.049574][ T1136] [ 549.058039][ T1136] NMI backtrace for cpu 0 [ 549.062370][ T1136] CPU: 0 PID: 1136 Comm: khungtaskd Not tainted 5.6.0-rc1-syzkaller #0 [ 549.070623][ T1136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 549.080660][ T1136] Call Trace: [ 549.083998][ T1136] dump_stack+0x197/0x210 [ 549.088317][ T1136] nmi_cpu_backtrace.cold+0x70/0xb2 [ 549.094106][ T1136] ? vprintk_func+0x86/0x189 [ 549.098736][ T1136] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 549.104403][ T1136] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 549.110405][ T1136] arch_trigger_cpumask_backtrace+0x14/0x20 [ 549.116303][ T1136] watchdog+0xb11/0x10c0 [ 549.120601][ T1136] kthread+0x361/0x430 [ 549.124655][ T1136] ? reset_hung_task_detector+0x30/0x30 [ 549.130175][ T1136] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 549.135884][ T1136] ret_from_fork+0x24/0x30 [ 549.140418][ T1136] Sending NMI from CPU 0 to CPUs 1: [ 549.145687][ C1] NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 [ 549.146625][ T1136] Kernel panic - not syncing: hung_task: blocked tasks [ 549.160754][ T1136] CPU: 0 PID: 1136 Comm: khungtaskd Not tainted 5.6.0-rc1-syzkaller #0 [ 549.168967][ T1136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 549.179006][ T1136] Call Trace: [ 549.182284][ T1136] dump_stack+0x197/0x210 [ 549.186681][ T1136] panic+0x2e3/0x75c [ 549.190566][ T1136] ? add_taint.cold+0x16/0x16 [ 549.195248][ T1136] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 549.200958][ T1136] ? printk_safe_flush+0xf2/0x140 [ 549.206004][ T1136] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 549.212229][ T1136] ? nmi_trigger_cpumask_backtrace+0x224/0x28b [ 549.218372][ T1136] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 549.224539][ T1136] watchdog+0xb22/0x10c0 [ 549.228785][ T1136] kthread+0x361/0x430 [ 549.232833][ T1136] ? reset_hung_task_detector+0x30/0x30 [ 549.238355][ T1136] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 549.244107][ T1136] ret_from_fork+0x24/0x30 [ 549.250130][ T1136] Kernel Offset: disabled [ 549.254460][ T1136] Rebooting in 86400 seconds..