[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 1146.015737][ T27] INFO: task syz-executor148:7017 blocked for more than 143 seconds. [ 1146.023969][ T27] Not tainted 5.14.0-rc7-next-20210827-syzkaller #0 [ 1146.034026][ T27] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1146.043725][ T27] task:syz-executor148 state:D stack:26944 pid: 7017 ppid: 6558 flags:0x00004002 [ 1146.053865][ T27] Call Trace: [ 1146.058067][ T27] __schedule+0x940/0x26f0 [ 1146.062572][ T27] ? io_schedule_timeout+0x140/0x140 [ 1146.069258][ T27] schedule+0xd3/0x270 [ 1146.073339][ T27] schedule_preempt_disabled+0xf/0x20 [ 1146.080837][ T27] __mutex_lock+0xa34/0x12f0 [ 1146.086314][ T27] ? vhost_net_stop+0x142/0x270 [ 1146.091237][ T27] ? mutex_lock_io_nested+0x1150/0x1150 [ 1146.097960][ T27] ? vhost_net_buf_unproduce+0x16/0x560 [ 1146.103526][ T27] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 1146.110748][ T27] vhost_net_stop+0x142/0x270 [ 1146.115443][ T27] vhost_net_release+0x9c/0x2d0 [ 1146.121358][ T27] ? vhost_net_stop+0x270/0x270 [ 1146.126972][ T27] ? fcntl_setlk+0xd50/0xd50 [ 1146.131615][ T27] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 1146.139209][ T27] ? ima_file_free+0xb6/0x420 [ 1146.143936][ T27] __fput+0x288/0x9f0 [ 1146.149448][ T27] ? vhost_net_stop+0x270/0x270 [ 1146.154324][ T27] task_work_run+0xdd/0x1a0 [ 1146.160088][ T27] do_exit+0xbae/0x2a30 [ 1146.164307][ T27] ? __context_tracking_exit+0xb8/0xe0 [ 1146.170937][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 1146.176474][ T27] ? lock_downgrade+0x6e0/0x6e0 [ 1146.181340][ T27] ? mm_update_next_owner+0x7a0/0x7a0 [ 1146.187843][ T27] do_group_exit+0x125/0x310 [ 1146.192446][ T27] __x64_sys_exit_group+0x3a/0x50 [ 1146.198568][ T27] do_syscall_64+0x35/0xb0 [ 1146.202992][ T27] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1146.210176][ T27] RIP: 0033:0x43ef89 [ 1146.214071][ T27] RSP: 002b:00007ffe904551c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 1146.223555][ T27] RAX: ffffffffffffffda RBX: 00000000004b03b0 RCX: 000000000043ef89 [ 1146.232296][ T27] RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 [ 1146.240966][ T27] RBP: 0000000000000000 R08: ffffffffffffffc0 R09: 00007ffe90455240 [ 1146.249692][ T27] R10: 00007ffe90455240 R11: 0000000000000246 R12: 00000000004b03b0 [ 1146.258690][ T27] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001 [ 1146.267865][ T27] [ 1146.267865][ T27] Showing all locks held in the system: [ 1146.276600][ T27] 1 lock held by khungtaskd/27: [ 1146.281443][ T27] #0: ffffffff8b97fbe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 1146.293683][ T27] 1 lock held by in:imklog/6251: [ 1146.299886][ T27] #0: ffff8880740de370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 1146.309799][ T27] 1 lock held by syz-executor148/7017: [ 1146.315252][ T27] #0: ffff88806fbb0218 (&vq->mutex){+.+.}-{3:3}, at: vhost_net_stop+0x142/0x270 [ 1146.325628][ T27] 1 lock held by vhost-7017/7018: [ 1146.330676][ T27] [ 1146.332991][ T27] ============================================= [ 1146.332991][ T27] [ 1146.343068][ T27] NMI backtrace for cpu 1 [ 1146.347394][ T27] CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc7-next-20210827-syzkaller #0 [ 1146.356759][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1146.366804][ T27] Call Trace: [ 1146.370075][ T27] dump_stack_lvl+0xcd/0x134 [ 1146.374720][ T27] nmi_cpu_backtrace.cold+0x47/0x144 [ 1146.380012][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 1146.385248][ T27] nmi_trigger_cpumask_backtrace+0x1ae/0x220 [ 1146.391268][ T27] watchdog+0xcb7/0xed0 [ 1146.395441][ T27] ? trace_sched_process_hang+0x280/0x280 [ 1146.401168][ T27] kthread+0x3e5/0x4d0 [ 1146.405243][ T27] ? set_kthread_struct+0x130/0x130 [ 1146.410453][ T27] ret_from_fork+0x1f/0x30 [ 1146.415078][ T27] Sending NMI from CPU 1 to CPUs 0: [ 1146.420470][ C0] NMI backtrace for cpu 0 [ 1146.420481][ C0] CPU: 0 PID: 2960 Comm: systemd-journal Not tainted 5.14.0-rc7-next-20210827-syzkaller #0 [ 1146.420502][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1146.420512][ C0] RIP: 0010:__put_user_nocheck_4+0x5/0x11 [ 1146.420556][ C0] Code: 48 39 d9 73 54 0f 1f 00 66 89 01 31 c9 0f 1f 00 c3 0f 1f 44 00 00 48 bb fd ef ff ff ff 7f 00 00 48 39 d9 73 34 0f 1f 00 89 01 <31> c9 0f 1f 00 c3 66 0f 1f 44 00 00 48 bb f9 ef ff ff ff 7f 00 00 [ 1146.420574][ C0] RSP: 0018:ffffc9000241fc80 EFLAGS: 00000246 [ 1146.420590][ C0] RAX: 0000000000000001 RBX: 0000000000000001 RCX: 00007fffd0bcaf10 [ 1146.420602][ C0] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88801c98a2ac [ 1146.420627][ C0] RBP: ffff88801c98a260 R08: 0000000000000000 R09: ffff88807b240007 [ 1146.420638][ C0] R10: ffffffff81dbb85f R11: 0000000000000000 R12: ffff88801c98a258 [ 1146.420651][ C0] R13: 0000555a85d7c780 R14: ffff88801c98a240 R15: dffffc0000000000 [ 1146.420664][ C0] FS: 00007fc59a6be8c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 1146.420682][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1146.420695][ C0] CR2: 000055a11ef22b08 CR3: 000000001d815000 CR4: 00000000001506f0 [ 1146.420707][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1146.420718][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1146.420730][ C0] Call Trace: [ 1146.420735][ C0] do_epoll_wait+0x7ac/0x1940 [ 1146.420799][ C0] ? do_epoll_create+0x1c0/0x1c0 [ 1146.420819][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 1146.420842][ C0] ? populate_seccomp_data+0x214/0x540 [ 1146.420867][ C0] ? finish_wait+0x270/0x270 [ 1146.420908][ C0] ? seccomp_notify_ioctl+0xdc0/0xdc0 [ 1146.420936][ C0] __x64_sys_epoll_wait+0x158/0x270 [ 1146.420957][ C0] ? __ia32_sys_epoll_ctl+0x1c0/0x1c0 [ 1146.420979][ C0] ? __secure_computing+0x104/0x360 [ 1146.421003][ C0] do_syscall_64+0x35/0xb0 [ 1146.421022][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1146.421046][ C0] RIP: 0033:0x7fc5999872e3 [ 1146.421061][ C0] Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 83 3d 29 54 2b 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 0b c2 00 00 48 89 04 24 [ 1146.421079][ C0] RSP: 002b:00007fffd0bcaf08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 [ 1146.421096][ C0] RAX: ffffffffffffffda RBX: 0000555a85d7c1e0 RCX: 00007fc5999872e3 [ 1146.421109][ C0] RDX: 0000000000000013 RSI: 00007fffd0bcaf10 RDI: 0000000000000008 [ 1146.421120][ C0] RBP: 00007fffd0bcb100 R08: 00000000612981fb R09: 00007fffd0beb080 [ 1146.421132][ C0] R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffd0bcaf10 [ 1146.421144][ C0] R13: 0000000000000001 R14: ffffffffffffffff R15: 0005ca939b99a54d [ 1146.421470][ T27] Kernel panic - not syncing: hung_task: blocked tasks [ 1146.694647][ T27] CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.14.0-rc7-next-20210827-syzkaller #0 [ 1146.704001][ T27] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1146.714039][ T27] Call Trace: [ 1146.717301][ T27] dump_stack_lvl+0xcd/0x134 [ 1146.721884][ T27] panic+0x2b0/0x6dd [ 1146.725816][ T27] ? __warn_printk+0xf3/0xf3 [ 1146.730401][ T27] ? lapic_can_unplug_cpu+0x80/0x80 [ 1146.735586][ T27] ? preempt_schedule_thunk+0x16/0x18 [ 1146.740947][ T27] ? nmi_trigger_cpumask_backtrace+0x191/0x220 [ 1146.747094][ T27] ? watchdog.cold+0x1b9/0x1de [ 1146.751863][ T27] watchdog.cold+0x1ca/0x1de [ 1146.756445][ T27] ? trace_sched_process_hang+0x280/0x280 [ 1146.762156][ T27] kthread+0x3e5/0x4d0 [ 1146.766212][ T27] ? set_kthread_struct+0x130/0x130 [ 1146.771403][ T27] ret_from_fork+0x1f/0x30 [ 1146.777202][ T27] Kernel Offset: disabled [ 1146.781517][ T27] Rebooting in 86400 seconds..