[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.119' (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 syzkaller login: [ 1438.065375][ T1645] INFO: task kworker/u4:3:121 blocked for more than 143 seconds. [ 1438.073280][ T1645] Not tainted 5.14.0-rc4-syzkaller #0 [ 1438.083187][ T1645] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1438.093095][ T1645] task:kworker/u4:3 state:D stack:18584 pid: 121 ppid: 2 flags:0x00004000 [ 1438.104538][ T1645] Workqueue: events_unbound flush_to_ldisc [ 1438.111925][ T1645] Call Trace: [ 1438.116203][ T1645] __schedule+0xc07/0x11f0 [ 1438.120729][ T1645] ? __sched_text_start+0x8/0x8 [ 1438.127255][ T1645] ? do_raw_spin_lock+0x151/0x8e0 [ 1438.132356][ T1645] ? kthread_data+0x4d/0xc0 [ 1438.138569][ T1645] ? wq_worker_sleeping+0x5c/0x210 [ 1438.143748][ T1645] schedule+0x14b/0x210 [ 1438.150301][ T1645] schedule_preempt_disabled+0xf/0x20 [ 1438.156755][ T1645] __mutex_lock_common+0x116f/0x3770 [ 1438.162071][ T1645] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 1438.169868][ T1645] ? flush_to_ldisc+0x37/0x510 [ 1438.174753][ T1645] ? mutex_lock_io_nested+0x60/0x60 [ 1438.181822][ T1645] mutex_lock_nested+0x1a/0x20 [ 1438.187957][ T1645] flush_to_ldisc+0x37/0x510 [ 1438.192592][ T1645] process_one_work+0x833/0x10c0 [ 1438.200353][ T1645] ? worker_detach_from_pool+0x260/0x260 [ 1438.208247][ T1645] ? _raw_spin_lock_irqsave+0x100/0x100 [ 1438.214082][ T1645] ? kthread_data+0x4d/0xc0 [ 1438.220356][ T1645] ? wq_worker_running+0x8b/0x140 [ 1438.226657][ T1645] worker_thread+0xac1/0x1320 [ 1438.231388][ T1645] kthread+0x453/0x480 [ 1438.237261][ T1645] ? rcu_lock_release+0x20/0x20 [ 1438.242264][ T1645] ? kthread_blkcg+0xd0/0xd0 [ 1438.249514][ T1645] ret_from_fork+0x1f/0x30 [ 1438.254595][ T1645] INFO: task syz-executor558:8565 blocked for more than 143 seconds. [ 1438.264416][ T1645] Not tainted 5.14.0-rc4-syzkaller #0 [ 1438.272532][ T1645] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1438.282542][ T1645] task:syz-executor558 state:D stack:25496 pid: 8565 ppid: 8458 flags:0x00004004 [ 1438.293147][ T1645] Call Trace: [ 1438.297526][ T1645] __schedule+0xc07/0x11f0 [ 1438.302171][ T1645] ? __sched_text_start+0x8/0x8 [ 1438.308902][ T1645] ? do_raw_spin_lock+0x151/0x8e0 [ 1438.313981][ T1645] ? do_raw_spin_unlock+0x134/0x8a0 [ 1438.321107][ T1645] schedule+0x14b/0x210 [ 1438.326220][ T1645] schedule_preempt_disabled+0xf/0x20 [ 1438.331608][ T1645] __mutex_lock_common+0x116f/0x3770 [ 1438.340040][ T1645] ? set_selection_kernel+0x27/0x17d0 [ 1438.347083][ T1645] ? mutex_lock_io_nested+0x60/0x60 [ 1438.352320][ T1645] ? __might_fault+0xb8/0x110 [ 1438.358683][ T1645] ? __lock_acquire+0x6100/0x6100 [ 1438.363798][ T1645] mutex_lock_nested+0x1a/0x20 [ 1438.370293][ T1645] set_selection_kernel+0x27/0x17d0 [ 1438.376786][ T1645] ? __might_fault+0xb4/0x110 [ 1438.381504][ T1645] set_selection_user+0xaa/0xe0 [ 1438.388198][ T1645] ? sel_loadlut+0xf0/0xf0 [ 1438.392644][ T1645] ? handle_mm_fault+0x2460/0x2500 [ 1438.399389][ T1645] ? tioclinux+0xeb/0x590 [ 1438.403759][ T1645] vt_ioctl+0x455/0x37b0 [ 1438.409595][ T1645] ? vt_ioctl+0x151/0x37b0 [ 1438.414033][ T1645] ? kasan_set_track+0x54/0x70 [ 1438.420600][ T1645] ? __vt_event_wait+0x240/0x240 [ 1438.426791][ T1645] ? kfree+0xd0/0x1f0 [ 1438.430795][ T1645] ? kasan_set_track+0x54/0x70 [ 1438.437510][ T1645] ? kasan_set_track+0x3d/0x70 [ 1438.442306][ T1645] ? kasan_set_free_info+0x1f/0x40 [ 1438.448958][ T1645] ? ____kasan_slab_free+0x109/0x150 [ 1438.454256][ T1645] ? slab_free_freelist_hook+0x1d8/0x290 [ 1438.461445][ T1645] ? kfree+0xd0/0x1f0 [ 1438.468333][ T1645] ? tomoyo_path_number_perm+0x5c1/0x790 [ 1438.474045][ T1645] ? security_file_ioctl+0x55/0xb0 [ 1438.480754][ T1645] ? __se_sys_ioctl+0x48/0x170 [ 1438.486659][ T1645] ? do_syscall_64+0x3d/0xb0 [ 1438.491319][ T1645] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1438.499140][ T1645] ? lockdep_hardirqs_on_prepare+0x3e2/0x750 [ 1438.505145][ T1645] ? __lock_acquire+0x6100/0x6100 [ 1438.511862][ T1645] ? print_irqtrace_events+0x220/0x220 [ 1438.518414][ T1645] ? rcu_lock_release+0x5/0x20 [ 1438.523189][ T1645] ? rcu_read_lock_sched_held+0x87/0x110 [ 1438.530354][ T1645] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 1438.537322][ T1645] ? lockdep_hardirqs_on_prepare+0x3e2/0x750 [ 1438.543330][ T1645] ? do_vfs_ioctl+0xc4a/0x2ab0 [ 1438.550135][ T1645] ? __x64_compat_sys_ioctl+0x80/0x80 [ 1438.556788][ T1645] ? rcu_lock_release+0x5/0x20 [ 1438.561571][ T1645] ? __lock_acquire+0x6100/0x6100 [ 1438.568449][ T1645] ? tomoyo_path_number_perm+0x5c1/0x790 [ 1438.574108][ T1645] ? kfree+0xd0/0x1f0 [ 1438.579623][ T1645] ? tomoyo_path_number_perm+0x62a/0x790 [ 1438.586302][ T1645] tty_ioctl+0xf51/0x1720 [ 1438.590689][ T1645] ? tty_get_icount+0xa0/0xa0 [ 1438.598268][ T1645] ? memset+0x1f/0x40 [ 1438.602266][ T1645] ? smack_file_ioctl+0x284/0x390 [ 1438.608850][ T1645] ? smack_file_alloc_security+0xd0/0xd0 [ 1438.615117][ T1645] ? print_irqtrace_events+0x220/0x220 [ 1438.622102][ T1645] ? vtime_user_exit+0x2b2/0x3e0 [ 1438.628068][ T1645] ? vtime_user_enter+0x1ea/0x2d0 [ 1438.633110][ T1645] ? bpf_lsm_file_ioctl+0x5/0x10 [ 1438.639778][ T1645] ? security_file_ioctl+0x9d/0xb0 [ 1438.644907][ T1645] ? tty_get_icount+0xa0/0xa0 [ 1438.651262][ T1645] __se_sys_ioctl+0xfb/0x170 [ 1438.656858][ T1645] do_syscall_64+0x3d/0xb0 [ 1438.661292][ T1645] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1438.668924][ T1645] RIP: 0033:0x443859 [ 1438.672838][ T1645] RSP: 002b:00007ffe12f3c308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1438.683406][ T1645] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443859 [ 1438.693286][ T1645] RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 [ 1438.702287][ T1645] RBP: 0000000000000000 R08: 000000000000000e R09: 0000000000000000 [ 1438.711382][ T1645] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe12f3c348 [ 1438.720416][ T1645] R13: 00007ffe12f3c360 R14: 00007ffe12f3c3a0 R15: 0000000000000027 [ 1438.730800][ T1645] [ 1438.730800][ T1645] Showing all locks held in the system: [ 1438.739657][ T1645] 3 locks held by kworker/u4:3/121: [ 1438.744863][ T1645] #0: ffff888011069138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7aa/0x10c0 [ 1438.757573][ T1645] #1: ffffc9000130fd20 ((work_completion)(&buf->work)){+.+.}-{0:0}, at: process_one_work+0x7e8/0x10c0 [ 1438.769740][ T1645] #2: ffff8880317940b8 (&buf->lock){+.+.}-{3:3}, at: flush_to_ldisc+0x37/0x510 [ 1438.779918][ T1645] 1 lock held by khungtaskd/1645: [ 1438.784948][ T1645] #0: ffffffff8c7177c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 [ 1438.797104][ T1645] 1 lock held by in:imklog/8147: [ 1438.802050][ T1645] #0: ffff888016df6870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 [ 1438.813147][ T1645] 3 locks held by syz-executor558/8564: [ 1438.819657][ T1645] 1 lock held by syz-executor558/8565: [ 1438.825115][ T1645] #0: ffffffff8cdda7c8 (vc_sel.lock){+.+.}-{3:3}, at: set_selection_kernel+0x27/0x17d0 [ 1438.836937][ T1645] [ 1438.839273][ T1645] ============================================= [ 1438.839273][ T1645] [ 1438.850734][ T1645] NMI backtrace for cpu 0 [ 1438.855072][ T1645] CPU: 0 PID: 1645 Comm: khungtaskd Not tainted 5.14.0-rc4-syzkaller #0 [ 1438.863432][ T1645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1438.873756][ T1645] Call Trace: [ 1438.877040][ T1645] dump_stack_lvl+0x1d3/0x29f [ 1438.881798][ T1645] ? show_regs_print_info+0x12/0x12 [ 1438.887080][ T1645] ? log_buf_vmcoreinfo_setup+0x498/0x498 [ 1438.892843][ T1645] ? printk+0xc0/0x108 [ 1438.896903][ T1645] ? log_buf_vmcoreinfo_setup+0x498/0x498 [ 1438.902621][ T1645] ? wake_up_klogd+0xb2/0xf0 [ 1438.907209][ T1645] ? trace_vector_free_moved+0x190/0x1b0 [ 1438.912985][ T1645] nmi_cpu_backtrace+0x16c/0x190 [ 1438.918065][ T1645] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 1438.924168][ T1645] nmi_trigger_cpumask_backtrace+0x191/0x2f0 [ 1438.930440][ T1645] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 1438.936541][ T1645] watchdog+0xd06/0xd50 [ 1438.940878][ T1645] kthread+0x453/0x480 [ 1438.944944][ T1645] ? hungtask_pm_notify+0x50/0x50 [ 1438.949961][ T1645] ? kthread_blkcg+0xd0/0xd0 [ 1438.954552][ T1645] ret_from_fork+0x1f/0x30 [ 1438.959449][ T1645] Sending NMI from CPU 0 to CPUs 1: [ 1438.965301][ C1] NMI backtrace for cpu 1 [ 1438.965309][ C1] CPU: 1 PID: 8564 Comm: syz-executor558 Not tainted 5.14.0-rc4-syzkaller #0 [ 1438.965314][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1438.965325][ C1] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2b/0x90 [ 1438.965331][ C1] Code: 8b 04 24 65 48 8b 14 25 80 ef 01 00 65 8b 05 14 c6 81 7e a9 00 01 ff 00 74 10 a9 00 01 00 00 74 6a 83 ba 34 15 00 00 00 74 61 <8b> 82 10 15 00 00 83 f8 03 75 56 48 8b 8a 18 15 00 00 44 8b 8a 14 [ 1438.965339][ C1] RSP: 0018:ffffc9000160f6d8 EFLAGS: 00000246 [ 1438.965348][ C1] RAX: 0000000080000000 RBX: 0000000000004002 RCX: ffffffff84752084 [ 1438.965353][ C1] RDX: ffff8880296dd4c0 RSI: 0000000000000000 RDI: 0000000000000000 [ 1438.965358][ C1] RBP: ffffc9000160f7f0 R08: ffffffff847520ab R09: ffffed10052dba99 [ 1438.965362][ C1] R10: ffffed10052dba99 R11: 0000000000000000 R12: ffff888146207438 [ 1438.965367][ C1] R13: ffff8880296dd4c0 R14: dffffc0000000000 R15: dffffc0000000000 [ 1438.965372][ C1] FS: 0000000001e513c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 1438.965377][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1438.965382][ C1] CR2: 00000000004bdee8 CR3: 0000000014be1000 CR4: 00000000001506e0 [ 1438.965386][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 1438.965391][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 1438.965395][ C1] Call Trace: [ 1438.965398][ C1] paste_selection+0x28b/0x500 [ 1438.965401][ C1] ? set_selection_kernel+0x17d0/0x17d0 [ 1438.965405][ C1] ? sched_dynamic_update+0x1a0/0x1a0 [ 1438.965408][ C1] ? __might_fault+0xb4/0x110 [ 1438.965411][ C1] ? tioclinux+0x11f/0x590 [ 1438.965415][ C1] vt_ioctl+0x455/0x37b0 [ 1438.965418][ C1] ? vt_ioctl+0x151/0x37b0 [ 1438.965421][ C1] ? kasan_set_track+0x54/0x70 [ 1438.965424][ C1] ? __vt_event_wait+0x240/0x240 [ 1438.965427][ C1] ? kfree+0xd0/0x1f0 [ 1438.965431][ C1] ? kasan_set_track+0x54/0x70 [ 1438.965434][ C1] ? kasan_set_track+0x3d/0x70 [ 1438.965437][ C1] ? kasan_set_free_info+0x1f/0x40 [ 1438.965441][ C1] ? ____kasan_slab_free+0x109/0x150 [ 1438.965445][ C1] ? slab_free_freelist_hook+0x1d8/0x290 [ 1438.965448][ C1] ? kfree+0xd0/0x1f0 [ 1438.965451][ C1] ? tomoyo_path_number_perm+0x5c1/0x790 [ 1438.965455][ C1] ? security_file_ioctl+0x55/0xb0 [ 1438.965458][ C1] ? __se_sys_ioctl+0x48/0x170 [ 1438.965461][ C1] ? do_syscall_64+0x3d/0xb0 [ 1438.965465][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1438.965469][ C1] ? lockdep_hardirqs_on_prepare+0x3e2/0x750 [ 1438.965473][ C1] ? __lock_acquire+0x6100/0x6100 [ 1438.965476][ C1] ? print_irqtrace_events+0x220/0x220 [ 1438.965479][ C1] ? rcu_lock_release+0x5/0x20 [ 1438.965483][ C1] ? rcu_read_lock_sched_held+0x87/0x110 [ 1438.965487][ C1] ? __bpf_trace_rcu_stall_warning+0x10/0x10 [ 1438.965490][ C1] ? lockdep_hardirqs_on_prepare+0x3e2/0x750 [ 1438.965494][ C1] ? do_vfs_ioctl+0xc4a/0x2ab0 [ 1438.965497][ C1] ? __x64_compat_sys_ioctl+0x80/0x80 [ 1438.965501][ C1] ? rcu_lock_release+0x5/0x20 [ 1438.965504][ C1] ? __lock_acquire+0x6100/0x6100 [ 1438.965508][ C1] ? tomoyo_path_number_perm+0x5c1/0x790 [ 1438.965511][ C1] ? kfree+0xd0/0x1f0 [ 1438.965514][ C1] ? tomoyo_path_number_perm+0x62a/0x790 [ 1438.965518][ C1] tty_ioctl+0xf51/0x1720 [ 1438.965521][ C1] ? tty_get_icount+0xa0/0xa0 [ 1438.965524][ C1] ? memset+0x1f/0x40 [ 1438.965527][ C1] ? smack_file_ioctl+0x284/0x390 [ 1438.965531][ C1] ? smack_file_alloc_security+0xd0/0xd0 [ 1438.965534][ C1] ? print_irqtrace_events+0x220/0x220 [ 1438.965538][ C1] ? vtime_user_exit+0x2b2/0x3e0 [ 1438.965541][ C1] ? bpf_lsm_file_ioctl+0x5/0x10 [ 1438.965545][ C1] ? security_file_ioctl+0x9d/0xb0 [ 1438.965548][ C1] ? tty_get_icount+0xa0/0xa0 [ 1438.965551][ C1] __se_sys_ioctl+0xfb/0x170 [ 1438.965555][ C1] do_syscall_64+0x3d/0xb0 [ 1438.965558][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 1438.965561][ C1] RIP: 0033:0x443859 [ 1438.965567][ C1] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 15 00 00 90 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 73 01 c3 48 c7 c1 c4 ff ff ff f7 d8 64 89 01 48 [ 1438.965575][ C1] RSP: 002b:00007ffe12f3c308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 1438.965586][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443859 [ 1438.965591][ C1] RDX: 0000000020000000 RSI: 000000000000541c RDI: 0000000000000003 [ 1438.965595][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 1438.965600][ C1] R10: 000000000000000e R11: 0000000000000246 R12: 00007ffe12f3c348 [ 1438.965605][ C1] R13: 00007ffe12f3c360 R14: 00007ffe12f3c3a0 R15: 0000000000000026 [ 1439.445166][ T1645] Kernel panic - not syncing: hung_task: blocked tasks [ 1439.452147][ T1645] CPU: 0 PID: 1645 Comm: khungtaskd Not tainted 5.14.0-rc4-syzkaller #0 [ 1439.460557][ T1645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1439.470697][ T1645] Call Trace: [ 1439.474008][ T1645] dump_stack_lvl+0x1ae/0x29f [ 1439.478788][ T1645] ? show_regs_print_info+0x12/0x12 [ 1439.484072][ T1645] ? log_buf_vmcoreinfo_setup+0x498/0x498 [ 1439.489789][ T1645] ? lockdep_hardirqs_off+0x69/0xf0 [ 1439.495131][ T1645] panic+0x2e1/0x850 [ 1439.499095][ T1645] ? _raw_spin_unlock+0x40/0x40 [ 1439.504032][ T1645] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 1439.510361][ T1645] ? nmi_panic+0x90/0x90 [ 1439.514689][ T1645] ? preempt_schedule_thunk+0x16/0x18 [ 1439.520061][ T1645] ? nmi_trigger_cpumask_backtrace+0x236/0x2f0 [ 1439.528678][ T1645] ? nmi_trigger_cpumask_backtrace+0x29b/0x2f0 [ 1439.535028][ T1645] ? nmi_trigger_cpumask_backtrace+0x2a0/0x2f0 [ 1439.541183][ T1645] ? arch_trigger_cpumask_backtrace+0x10/0x10 [ 1439.547252][ T1645] watchdog+0xd46/0xd50 [ 1439.551429][ T1645] kthread+0x453/0x480 [ 1439.555514][ T1645] ? hungtask_pm_notify+0x50/0x50 [ 1439.560532][ T1645] ? kthread_blkcg+0xd0/0xd0 [ 1439.565379][ T1645] ret_from_fork+0x1f/0x30 [ 1439.572418][ T1645] Kernel Offset: disabled [ 1439.576970][ T1645] Rebooting in 86400 seconds..