[ 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 '10.128.1.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.238923][ T1173] INFO: task syz-executor698:6896 blocked for more than 143 seconds. [ 616.247165][ T1173] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.254652][ T1173] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.263588][ T1173] task:syz-executor698 state:D stack:28104 pid: 6896 ppid: 6890 flags:0x00004000 [ 616.272873][ T1173] Call Trace: [ 616.276323][ T1173] __schedule+0xea9/0x2230 [ 616.280886][ T1173] ? io_schedule_timeout+0x140/0x140 [ 616.286185][ T1173] schedule+0xd0/0x2a0 [ 616.291390][ T1173] schedule_timeout+0x1d8/0x250 [ 616.296257][ T1173] ? usleep_range+0x170/0x170 [ 616.302268][ T1173] ? lock_downgrade+0x830/0x830 [ 616.307208][ T1173] ? do_raw_spin_lock+0x120/0x2b0 [ 616.313097][ T1173] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.318300][ T1173] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.325088][ T1173] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.330766][ T1173] wait_for_completion+0x163/0x260 [ 616.335872][ T1173] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.342668][ T1173] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.349710][ T1173] ? _raw_spin_unlock_irqrestore+0x5c/0x90 [ 616.355507][ T1173] ? __kthread_bind_mask+0xa1/0xc0 [ 616.361461][ T1173] io_uring_setup+0x1495/0x29a0 [ 616.366331][ T1173] ? io_sq_thread+0xe00/0xe00 [ 616.372022][ T1173] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.376907][ T1173] ? io_wake_function+0x2e0/0x2e0 [ 616.382164][ T1173] ? check_preemption_disabled+0x50/0x130 [ 616.387900][ T1173] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.394027][ T1173] ? lockdep_hardirqs_on+0x53/0x100 [ 616.399416][ T1173] do_syscall_64+0x2d/0x70 [ 616.403847][ T1173] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.409802][ T1173] RIP: 0033:0x440299 [ 616.413702][ T1173] Code: Bad RIP value. [ 616.417769][ T1173] RSP: 002b:00007fff1bcc6b68 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.427341][ T1173] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 616.435493][ T1173] RDX: 0000000000400b40 RSI: 0000000020000200 RDI: 00000000000016bd [ 616.443596][ T1173] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.451640][ T1173] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 616.459692][ T1173] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 616.467707][ T1173] INFO: task io_uring-sq:6897 blocked for more than 143 seconds. [ 616.475683][ T1173] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.482846][ T1173] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.491557][ T1173] task:io_uring-sq state:D stack:31200 pid: 6897 ppid: 2 flags:0x00004000 [ 616.500860][ T1173] Call Trace: [ 616.504164][ T1173] __schedule+0xea9/0x2230 [ 616.508587][ T1173] ? io_schedule_timeout+0x140/0x140 [ 616.513924][ T1173] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.519832][ T1173] schedule+0xd0/0x2a0 [ 616.523894][ T1173] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.529818][ T1173] schedule_preempt_disabled+0xf/0x20 [ 616.535197][ T1173] kthread+0x2ac/0x4a0 [ 616.539581][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 616.544708][ T1173] ret_from_fork+0x1f/0x30 [ 616.550136][ T1173] [ 616.550136][ T1173] Showing all locks held in the system: [ 616.557863][ T1173] 1 lock held by khungtaskd/1173: [ 616.562987][ T1173] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.572940][ T1173] 1 lock held by in:imklog/6572: [ 616.577868][ T1173] #0: ffff88809697dd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.587084][ T1173] [ 616.589505][ T1173] ============================================= [ 616.589505][ T1173] [ 616.597932][ T1173] NMI backtrace for cpu 1 [ 616.602438][ T1173] CPU: 1 PID: 1173 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.611904][ T1173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.621942][ T1173] Call Trace: [ 616.625213][ T1173] dump_stack+0x198/0x1fd [ 616.629535][ T1173] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.634771][ T1173] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.640398][ T1173] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.646371][ T1173] watchdog+0xd89/0xf30 [ 616.650508][ T1173] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.656224][ T1173] kthread+0x3b5/0x4a0 [ 616.660296][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 616.665392][ T1173] ret_from_fork+0x1f/0x30 [ 616.669937][ T1173] Sending NMI from CPU 1 to CPUs 0: [ 616.675787][ C0] NMI backtrace for cpu 0 [ 616.675795][ C0] CPU: 0 PID: 3910 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.675802][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.675806][ C0] RIP: 0010:rcu_is_watching+0x5d/0xb0 [ 616.675818][ C0] Code: 80 3c 11 00 75 61 48 03 1c c5 00 89 85 89 48 b8 00 00 00 00 00 fc ff df 48 8d bb 28 01 00 00 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 25 8b 83 28 01 00 [ 616.675823][ C0] RSP: 0018:ffffc900053a7940 EFLAGS: 00000a06 [ 616.675832][ C0] RAX: dffffc0000000000 RBX: ffff8880ae636dc0 RCX: 1ffffffff130b120 [ 616.675838][ C0] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880ae636ee8 [ 616.675844][ C0] RBP: 00007f49ad134840 R08: ffffffff8ba70cac R09: ffffffff8ba70cb0 [ 616.675850][ C0] R10: 000000000007201e R11: 0000000000000001 R12: ffffc900053a7a50 [ 616.675855][ C0] R13: 0000000000000000 R14: ffff8880a8d0c380 R15: 0000000000001000 [ 616.675862][ C0] FS: 00007f49adba48c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 616.675867][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.675873][ C0] CR2: 00007f49aaf47018 CR3: 00000000939de000 CR4: 00000000001506f0 [ 616.675878][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.675884][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.675888][ C0] Call Trace: [ 616.675892][ C0] ? __unwind_start+0x517/0x800 [ 616.675896][ C0] kernel_text_address+0x56/0xf0 [ 616.675901][ C0] __kernel_text_address+0x9/0x30 [ 616.675905][ C0] unwind_get_return_address+0x51/0x90 [ 616.675909][ C0] ? profile_setup.cold+0xc1/0xc1 [ 616.675914][ C0] arch_stack_walk+0x97/0xf0 [ 616.675918][ C0] stack_trace_save+0x8c/0xc0 [ 616.675922][ C0] ? stack_trace_consume_entry+0x160/0x160 [ 616.675926][ C0] kasan_save_stack+0x1b/0x40 [ 616.675931][ C0] ? kasan_save_stack+0x1b/0x40 [ 616.675935][ C0] ? __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 616.675940][ C0] ? kmem_cache_alloc+0x13a/0x3a0 [ 616.675944][ C0] ? getname_flags.part.0+0x50/0x4f0 [ 616.675948][ C0] ? getname+0x8e/0xd0 [ 616.675952][ C0] ? do_sys_openat2+0xf5/0x420 [ 616.675956][ C0] ? __x64_sys_open+0x119/0x1c0 [ 616.675960][ C0] ? do_syscall_64+0x2d/0x70 [ 616.675965][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.675969][ C0] ? lock_acquire+0x1f3/0xae0 [ 616.675974][ C0] ? cache_grow_end+0x46/0x170 [ 616.675978][ C0] ? lock_is_held_type+0xbb/0xf0 [ 616.675982][ C0] ? find_held_lock+0x2d/0x110 [ 616.675987][ C0] ? cache_alloc_refill+0x2fd/0x340 [ 616.675991][ C0] ? lock_downgrade+0x830/0x830 [ 616.675995][ C0] ? do_raw_spin_unlock+0x171/0x230 [ 616.676000][ C0] ? kasan_unpoison_shadow+0x33/0x40 [ 616.676004][ C0] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 616.676008][ C0] kmem_cache_alloc+0x13a/0x3a0 [ 616.676012][ C0] getname_flags.part.0+0x50/0x4f0 [ 616.676018][ C0] ? __sanitizer_cov_trace_switch+0x45/0x70 [ 616.676022][ C0] getname+0x8e/0xd0 [ 616.676026][ C0] do_sys_openat2+0xf5/0x420 [ 616.676030][ C0] ? seccomp_notify_ioctl+0xd90/0xd90 [ 616.676035][ C0] ? strncpy_from_user+0x2bf/0x3e0 [ 616.676039][ C0] ? build_open_flags+0x650/0x650 [ 616.676043][ C0] ? getname_flags.part.0+0x1dd/0x4f0 [ 616.676048][ C0] __x64_sys_open+0x119/0x1c0 [ 616.676052][ C0] ? do_sys_open+0x140/0x140 [ 616.676056][ C0] ? __secure_computing+0x104/0x360 [ 616.676060][ C0] do_syscall_64+0x2d/0x70 [ 616.676065][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.676069][ C0] RIP: 0033:0x7f49ad134840 [ 616.676080][ C0] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 616.676085][ C0] RSP: 002b:00007ffd90934fc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 616.676095][ C0] RAX: ffffffffffffffda RBX: 00007ffd909352d0 RCX: 00007f49ad134840 [ 616.676101][ C0] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055cd30481880 [ 616.676107][ C0] RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff [ 616.676113][ C0] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 616.676118][ C0] R13: 000055cd3047d040 R14: 00007ffd90935290 R15: 000055cd30488dd0 [ 616.676179][ T1173] Kernel panic - not syncing: hung_task: blocked tasks [ 617.102074][ T1173] CPU: 1 PID: 1173 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 617.111545][ T1173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.122715][ T1173] Call Trace: [ 617.126006][ T1173] dump_stack+0x198/0x1fd [ 617.130408][ T1173] panic+0x347/0x7c0 [ 617.134284][ T1173] ? __warn_printk+0xf3/0xf3 [ 617.138858][ T1173] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.144491][ T1173] ? preempt_schedule_thunk+0x16/0x18 [ 617.149844][ T1173] ? watchdog.cold+0x22d/0x24b [ 617.154601][ T1173] ? watchdog+0xc59/0xf30 [ 617.158931][ T1173] watchdog.cold+0x23e/0x24b [ 617.163503][ T1173] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.169223][ T1173] kthread+0x3b5/0x4a0 [ 617.173285][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 617.178379][ T1173] ret_from_fork+0x1f/0x30 [ 617.184050][ T1173] Kernel Offset: disabled [ 617.188387][ T1173] Rebooting in 86400 seconds..