[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.68' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.315021][ T1149] INFO: task syz-executor555:6843 blocked for more than 143 seconds. [ 616.323312][ T1149] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.332105][ T1149] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.341133][ T1149] task:syz-executor555 state:D stack:28104 pid: 6843 ppid: 6837 flags:0x00004000 [ 616.350536][ T1149] Call Trace: [ 616.354577][ T1149] __schedule+0xea9/0x2230 [ 616.359105][ T1149] ? io_schedule_timeout+0x140/0x140 [ 616.364413][ T1149] schedule+0xd0/0x2a0 [ 616.368542][ T1149] schedule_timeout+0x1d8/0x250 [ 616.373416][ T1149] ? usleep_range+0x170/0x170 [ 616.378348][ T1149] ? lock_downgrade+0x830/0x830 [ 616.383234][ T1149] ? do_raw_spin_lock+0x120/0x2b0 [ 616.388320][ T1149] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.395864][ T1149] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.401834][ T1149] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.407075][ T1149] wait_for_completion+0x163/0x260 [ 616.412212][ T1149] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.418257][ T1149] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.424822][ T1149] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 616.430714][ T1149] ? __kthread_bind_mask+0xa1/0xc0 [ 616.435950][ T1149] io_uring_setup+0x1495/0x29a0 [ 616.440811][ T1149] ? io_sq_thread+0xe00/0xe00 [ 616.446412][ T1149] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.451254][ T1149] ? io_wake_function+0x2e0/0x2e0 [ 616.456459][ T1149] ? check_preemption_disabled+0x50/0x130 [ 616.462176][ T1149] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.468322][ T1149] ? lockdep_hardirqs_on+0x53/0x100 [ 616.474204][ T1149] do_syscall_64+0x2d/0x70 [ 616.479481][ T1149] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.485457][ T1149] RIP: 0033:0x440299 [ 616.489341][ T1149] Code: Bad RIP value. [ 616.493474][ T1149] RSP: 002b:00007ffc6f8f1bc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.501989][ T1149] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 616.510347][ T1149] RDX: 0000000000400b40 RSI: 0000000020000000 RDI: 000000000000497a [ 616.518408][ T1149] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.526446][ T1149] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 616.534426][ T1149] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 616.542659][ T1149] INFO: task io_uring-sq:6844 blocked for more than 143 seconds. [ 616.550466][ T1149] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.557617][ T1149] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.566369][ T1149] task:io_uring-sq state:D stack:31200 pid: 6844 ppid: 2 flags:0x00004000 [ 616.577392][ T1149] Call Trace: [ 616.580689][ T1149] __schedule+0xea9/0x2230 [ 616.585184][ T1149] ? io_schedule_timeout+0x140/0x140 [ 616.590478][ T1149] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.596353][ T1149] schedule+0xd0/0x2a0 [ 616.600480][ T1149] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.606346][ T1149] schedule_preempt_disabled+0xf/0x20 [ 616.611723][ T1149] kthread+0x2ac/0x4a0 [ 616.615854][ T1149] ? __kthread_bind_mask+0xc0/0xc0 [ 616.621336][ T1149] ret_from_fork+0x1f/0x30 [ 616.625835][ T1149] [ 616.625835][ T1149] Showing all locks held in the system: [ 616.633556][ T1149] 1 lock held by khungtaskd/1149: [ 616.638674][ T1149] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.648622][ T1149] no locks held by systemd-journal/3899. [ 616.654241][ T1149] 1 lock held by in:imklog/6534: [ 616.659265][ T1149] [ 616.661604][ T1149] ============================================= [ 616.661604][ T1149] [ 616.670085][ T1149] NMI backtrace for cpu 1 [ 616.674466][ T1149] CPU: 1 PID: 1149 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.683904][ T1149] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.693939][ T1149] Call Trace: [ 616.697318][ T1149] dump_stack+0x198/0x1fd [ 616.701632][ T1149] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.706856][ T1149] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.712487][ T1149] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.718596][ T1149] watchdog+0xd89/0xf30 [ 616.722742][ T1149] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.728469][ T1149] kthread+0x3b5/0x4a0 [ 616.732525][ T1149] ? __kthread_bind_mask+0xc0/0xc0 [ 616.737619][ T1149] ret_from_fork+0x1f/0x30 [ 616.742157][ T1149] Sending NMI from CPU 1 to CPUs 0: [ 616.748123][ C0] NMI backtrace for cpu 0 [ 616.748131][ C0] CPU: 0 PID: 3899 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.748138][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.748142][ C0] RIP: 0010:lock_is_held_type+0xb1/0xf0 [ 616.748154][ C0] Code: b6 46 22 45 31 e4 83 e0 03 39 c8 41 0f 94 c4 65 48 8b 14 25 c0 fe 01 00 8b 82 0c 09 00 00 83 e8 01 66 85 c0 89 82 0c 09 00 00 <75> 27 4c 89 ff e8 95 f4 5f f9 48 83 c4 08 44 89 e0 5b 5d 41 5c 41 [ 616.748158][ C0] RSP: 0018:ffffc900052dfaa0 EFLAGS: 00000046 [ 616.748167][ C0] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 1ffffffff130b120 [ 616.748173][ C0] RDX: ffff888093d92340 RSI: ffffffff89c67440 RDI: ffff888093d92c78 [ 616.748178][ C0] RBP: ffff888093d92340 R08: 0000000000000000 R09: ffffffff8abcb60f [ 616.748184][ C0] R10: fffffbfff15796c1 R11: 0000000000000000 R12: 0000000000000000 [ 616.748189][ C0] R13: ffff888093d92c50 R14: ffff888093d92c78 R15: 0000000000000086 [ 616.748195][ C0] FS: 00007fe7f74b18c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 616.748200][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.748205][ C0] CR2: 00007fe7f4857000 CR3: 0000000093dc8000 CR4: 00000000001506f0 [ 616.748211][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.748216][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.748219][ C0] Call Trace: [ 616.748223][ C0] ? debug_check_no_obj_freed+0x20c/0x41c [ 616.748227][ C0] rcu_read_lock_sched_held+0x3a/0xb0 [ 616.748231][ C0] lock_release+0x6a1/0x8f0 [ 616.748235][ C0] ? lock_downgrade+0x830/0x830 [ 616.748238][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 616.748242][ C0] ? __free_pages_ok+0x435/0xd20 [ 616.748246][ C0] _raw_spin_unlock_irqrestore+0x16/0x90 [ 616.748251][ C0] debug_check_no_obj_freed+0x20c/0x41c [ 616.748254][ C0] __free_pages_ok+0x240/0xd20 [ 616.748258][ C0] slabs_destroy+0x89/0xc0 [ 616.748262][ C0] ___cache_free+0x4fb/0x740 [ 616.748265][ C0] qlist_free_all+0x98/0x170 [ 616.748269][ C0] quarantine_reduce+0x17e/0x200 [ 616.748273][ C0] __kasan_kmalloc.constprop.0+0x9e/0xd0 [ 616.748277][ C0] ? kmem_cache_alloc+0x269/0x3a0 [ 616.748281][ C0] kmem_cache_alloc+0x13a/0x3a0 [ 616.748284][ C0] prepare_creds+0x3b/0x730 [ 616.748288][ C0] do_faccessat+0x3d7/0x820 [ 616.748291][ C0] ? stream_open+0x60/0x60 [ 616.748295][ C0] ? __secure_computing+0x104/0x360 [ 616.748299][ C0] do_syscall_64+0x2d/0x70 [ 616.748303][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.748307][ C0] RIP: 0033:0x7fe7f676d9c7 [ 616.748319][ C0] Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 [ 616.748322][ C0] RSP: 002b:00007ffef9b5d598 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 616.748332][ C0] RAX: ffffffffffffffda RBX: 00007ffef9b605c0 RCX: 00007fe7f676d9c7 [ 616.748337][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00005582d4e3e9a3 [ 616.748343][ C0] RBP: 00007ffef9b5d6e0 R08: 00005582d4e343e5 R09: 0000000000000018 [ 616.748348][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 616.748354][ C0] R13: 0000000000000000 R14: 00005582d63bc8a0 R15: 00007ffef9b5dbd0 [ 616.749347][ T1149] Kernel panic - not syncing: hung_task: blocked tasks [ 617.073897][ T1149] CPU: 1 PID: 1149 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 617.083324][ T1149] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.093377][ T1149] Call Trace: [ 617.096675][ T1149] dump_stack+0x198/0x1fd [ 617.101050][ T1149] panic+0x347/0x7c0 [ 617.104931][ T1149] ? __warn_printk+0xf3/0xf3 [ 617.109506][ T1149] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.115118][ T1149] ? preempt_schedule_thunk+0x16/0x18 [ 617.120468][ T1149] ? watchdog.cold+0x22d/0x24b [ 617.125211][ T1149] ? watchdog+0xc59/0xf30 [ 617.129608][ T1149] watchdog.cold+0x23e/0x24b [ 617.134207][ T1149] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.139913][ T1149] kthread+0x3b5/0x4a0 [ 617.143959][ T1149] ? __kthread_bind_mask+0xc0/0xc0 [ 617.149052][ T1149] ret_from_fork+0x1f/0x30 [ 617.154957][ T1149] Kernel Offset: disabled [ 617.159284][ T1149] Rebooting in 86400 seconds..