[ 85.449232][ T27] audit: type=1800 audit(1582495721.094:25): pid=9642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 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. [ 86.355011][ T27] kauditd_printk_skb: 3 callbacks suppressed [ 86.355022][ T27] audit: type=1800 audit(1582495721.994:29): pid=9642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 86.381702][ T27] audit: type=1800 audit(1582495721.994:30): pid=9642 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.193' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 612.755351][ T1094] INFO: task syz-executor067:9796 blocked for more than 143 seconds. [ 612.763709][ T1094] Not tainted 5.6.0-rc2-syzkaller #0 [ 612.769692][ T1094] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 612.778543][ T1094] syz-executor067 D28056 9796 9794 0x00000000 [ 612.784937][ T1094] Call Trace: [ 612.788492][ T1094] __schedule+0x934/0x1f90 [ 612.792935][ T1094] ? firmware_map_remove+0x1a3/0x1a3 [ 612.799344][ T1094] ? lockdep_hardirqs_on+0x421/0x5e0 [ 612.804757][ T1094] ? __lock_sock+0x160/0x290 [ 612.809549][ T1094] ? trace_hardirqs_on+0x67/0x240 [ 612.814605][ T1094] schedule+0xdc/0x2b0 [ 612.818791][ T1094] __lock_sock+0x165/0x290 [ 612.823227][ T1094] ? __sk_dst_check+0x2e0/0x2e0 [ 612.828397][ T1094] ? finish_wait+0x260/0x260 [ 612.833024][ T1094] lock_sock_nested+0xfe/0x120 [ 612.837975][ T1094] virtio_transport_release+0xc4/0xd60 [ 612.843461][ T1094] ? virtio_transport_close_timeout+0x220/0x220 [ 612.849920][ T1094] ? rcu_read_lock_held+0x9c/0xb0 [ 612.855060][ T1094] ? __kasan_check_read+0x11/0x20 [ 612.860296][ T1094] vsock_assign_transport+0xf3/0x3b0 [ 612.865706][ T1094] vsock_stream_connect+0x2b3/0xc70 [ 612.870983][ T1094] ? tomoyo_socket_listen_permission+0x3b0/0x3b0 [ 612.877524][ T1094] ? vsock_dgram_connect+0x470/0x470 [ 612.883021][ T1094] ? finish_wait+0x260/0x260 [ 612.887809][ T1094] ? apparmor_socket_connect+0xb6/0x160 [ 612.893452][ T1094] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 612.899830][ T1094] __sys_connect_file+0x161/0x1c0 [ 612.904888][ T1094] ? move_addr_to_kernel.part.0+0xcd/0x110 [ 612.910814][ T1094] __sys_connect+0x174/0x1b0 [ 612.915594][ T1094] ? __sys_connect_file+0x1c0/0x1c0 [ 612.920819][ T1094] ? up_read+0x1cd/0x810 [ 612.925049][ T1094] ? down_read_non_owner+0x490/0x490 [ 612.931142][ T1094] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 612.936714][ T1094] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 612.942284][ T1094] ? do_syscall_64+0x26/0x790 [ 612.947156][ T1094] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 612.953244][ T1094] ? do_syscall_64+0x26/0x790 [ 612.958001][ T1094] __x64_sys_connect+0x73/0xb0 [ 612.962781][ T1094] do_syscall_64+0xfa/0x790 [ 612.967409][ T1094] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 612.973304][ T1094] RIP: 0033:0x4401b9 [ 612.977324][ T1094] Code: Bad RIP value. [ 612.981388][ T1094] RSP: 002b:00007ffc9b8a1db8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 612.989879][ T1094] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401b9 [ 612.997885][ T1094] RDX: 0000000000000010 RSI: 0000000020000440 RDI: 0000000000000003 [ 613.005932][ T1094] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 613.013916][ T1094] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a40 [ 613.021959][ T1094] R13: 0000000000401ad0 R14: 0000000000000000 R15: 0000000000000000 [ 613.030010][ T1094] [ 613.030010][ T1094] Showing all locks held in the system: [ 613.037776][ T1094] 1 lock held by khungtaskd/1094: [ 613.042795][ T1094] #0: ffffffff89bac240 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x279 [ 613.052201][ T1094] 1 lock held by rsyslogd/9680: [ 613.057695][ T1094] #0: ffff88809e718b60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 [ 613.066479][ T1094] 2 locks held by getty/9770: [ 613.071150][ T1094] #0: ffff8880a669d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.080147][ T1094] #1: ffffc90005bbb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.089855][ T1094] 2 locks held by getty/9771: [ 613.094521][ T1094] #0: ffff888094ec7090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.103569][ T1094] #1: ffffc90005b5b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.113219][ T1094] 2 locks held by getty/9772: [ 613.117956][ T1094] #0: ffff888094b91090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.127224][ T1094] #1: ffffc900061e72e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.136862][ T1094] 2 locks held by getty/9773: [ 613.141537][ T1094] #0: ffff8880a06a1090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.150593][ T1094] #1: ffffc90005b7b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.160228][ T1094] 2 locks held by getty/9774: [ 613.164883][ T1094] #0: ffff8880a6547090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.174018][ T1094] #1: ffffc900061eb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.183620][ T1094] 2 locks held by getty/9775: [ 613.188978][ T1094] #0: ffff888094159090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.198060][ T1094] #1: ffffc900061e32e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.207727][ T1094] 2 locks held by getty/9776: [ 613.212546][ T1094] #0: ffff88808ce0d090 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 [ 613.221762][ T1094] #1: ffffc90005b2f2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x220/0x1bf0 [ 613.231584][ T1094] 1 lock held by syz-executor067/9796: [ 613.237196][ T1094] #0: ffff88809fe008d0 (sk_lock-AF_VSOCK){+.+.}, at: vsock_stream_connect+0xfb/0xc70 [ 613.246866][ T1094] [ 613.249181][ T1094] ============================================= [ 613.249181][ T1094] [ 613.257663][ T1094] NMI backtrace for cpu 1 [ 613.261991][ T1094] CPU: 1 PID: 1094 Comm: khungtaskd Not tainted 5.6.0-rc2-syzkaller #0 [ 613.270488][ T1094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 613.280561][ T1094] Call Trace: [ 613.283952][ T1094] dump_stack+0x197/0x210 [ 613.288281][ T1094] nmi_cpu_backtrace.cold+0x70/0xb2 [ 613.293694][ T1094] ? vprintk_func+0x86/0x189 [ 613.298368][ T1094] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 613.304019][ T1094] nmi_trigger_cpumask_backtrace+0x23b/0x28b [ 613.310010][ T1094] arch_trigger_cpumask_backtrace+0x14/0x20 [ 613.315951][ T1094] watchdog+0xb11/0x10c0 [ 613.320250][ T1094] kthread+0x361/0x430 [ 613.324352][ T1094] ? reset_hung_task_detector+0x30/0x30 [ 613.330075][ T1094] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 613.335839][ T1094] ret_from_fork+0x24/0x30 [ 613.340422][ T1094] Sending NMI from CPU 1 to CPUs 0: [ 613.346319][ C0] NMI backtrace for cpu 0 [ 613.346326][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc2-syzkaller #0 [ 613.346333][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 613.346337][ C0] RIP: 0010:interrupt_entry+0xa0/0xc0 [ 613.346350][ C0] Code: 45 31 f6 41 57 45 31 ff 56 48 8d 6c 24 09 f6 84 24 90 00 00 00 03 74 05 e8 02 61 00 f9 48 8d 7c 24 08 65 ff 04 25 8c 1e 02 00 <75> 12 65 48 89 3c 25 f8 9f 00 00 65 48 8b 24 25 90 1e 02 00 57 ff [ 613.346354][ C0] RSP: 0018:ffffffff89a07c30 EFLAGS: 00000056 [ 613.346363][ C0] RAX: 1ffffffff136761a RBX: 0000000000000000 RCX: 0000000000000000 [ 613.346368][ C0] RDX: 0000000000000000 RSI: ffffffff880017fa RDI: ffffffff89a07c38 [ 613.346374][ C0] RBP: ffffffff89a07c39 R08: 0000000000000000 R09: 0000000000000000 [ 613.346379][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 613.346385][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 613.346391][ C0] FS: 0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 613.346396][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 613.346402][ C0] CR2: ffffffffff600400 CR3: 00000000a86ad000 CR4: 00000000001406f0 [ 613.346408][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 613.346413][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 613.346416][ C0] Call Trace: [ 613.346420][ C0] ? reschedule_interrupt+0xa/0x20 [ 613.346423][ C0] ? native_safe_halt+0xe/0x10 [ 613.346426][ C0] ? default_idle+0x4e/0x360 [ 613.346430][ C0] arch_cpu_idle+0xa/0x10 [ 613.346433][ C0] default_idle_call+0x84/0xb0 [ 613.346436][ C0] do_idle+0x3c8/0x6e0 [ 613.346440][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 613.346444][ C0] ? trace_hardirqs_on+0x67/0x240 [ 613.346448][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 613.346452][ C0] ? debug_smp_processor_id+0x33/0x18a [ 613.346455][ C0] cpu_startup_entry+0x1b/0x20 [ 613.346459][ C0] rest_init+0x23b/0x371 [ 613.346463][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 613.346467][ C0] arch_call_rest_init+0xe/0x1b [ 613.346470][ C0] start_kernel+0x886/0x8c5 [ 613.346474][ C0] ? mem_encrypt_init+0xb/0xb [ 613.346478][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 613.346482][ C0] ? x86_family+0x41/0x50 [ 613.346486][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 613.346498][ C0] x86_64_start_reservations+0x29/0x2b [ 613.346502][ C0] x86_64_start_kernel+0x77/0x7b [ 613.346506][ C0] secondary_startup_64+0xa4/0xb0 [ 613.347522][ T1094] Kernel panic - not syncing: hung_task: blocked tasks [ 613.601346][ T1094] CPU: 1 PID: 1094 Comm: khungtaskd Not tainted 5.6.0-rc2-syzkaller #0 [ 613.609559][ T1094] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 613.619593][ T1094] Call Trace: [ 613.622955][ T1094] dump_stack+0x197/0x210 [ 613.627486][ T1094] panic+0x2e3/0x75c [ 613.631375][ T1094] ? add_taint.cold+0x16/0x16 [ 613.636103][ T1094] ? lapic_can_unplug_cpu.cold+0x3a/0x3a [ 613.641721][ T1094] ? ___preempt_schedule+0x16/0x18 [ 613.646818][ T1094] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 613.652982][ T1094] ? nmi_trigger_cpumask_backtrace+0x24c/0x28b [ 613.659208][ T1094] ? nmi_trigger_cpumask_backtrace+0x256/0x28b [ 613.665455][ T1094] ? nmi_trigger_cpumask_backtrace+0x21b/0x28b [ 613.671617][ T1094] watchdog+0xb22/0x10c0 [ 613.675861][ T1094] kthread+0x361/0x430 [ 613.679919][ T1094] ? reset_hung_task_detector+0x30/0x30 [ 613.685440][ T1094] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 613.691140][ T1094] ret_from_fork+0x24/0x30 [ 613.697115][ T1094] Kernel Offset: disabled [ 613.701612][ T1094] Rebooting in 86400 seconds..