[ 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 '10.128.0.198' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.484520][ T1168] INFO: task syz-executor010:6848 blocked for more than 143 seconds. [ 616.492926][ T1168] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.501910][ T1168] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.511786][ T1168] task:syz-executor010 state:D stack:28104 pid: 6848 ppid: 6842 flags:0x00004000 [ 616.521693][ T1168] Call Trace: [ 616.525591][ T1168] __schedule+0xea9/0x2230 [ 616.530016][ T1168] ? io_schedule_timeout+0x140/0x140 [ 616.536062][ T1168] ? lockdep_hardirqs_on+0x53/0x100 [ 616.541265][ T1168] schedule+0xd0/0x2a0 [ 616.546152][ T1168] schedule_timeout+0x1d8/0x250 [ 616.551030][ T1168] ? usleep_range+0x170/0x170 [ 616.556666][ T1168] ? lock_downgrade+0x830/0x830 [ 616.561616][ T1168] ? do_raw_spin_lock+0x120/0x2b0 [ 616.567577][ T1168] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.572889][ T1168] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.579732][ T1168] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.585498][ T1168] wait_for_completion+0x163/0x260 [ 616.590739][ T1168] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.598100][ T1168] ? apparmor_capable+0x1d8/0x460 [ 616.603137][ T1168] ? security_capable+0x8f/0xc0 [ 616.608753][ T1168] io_uring_setup+0x1495/0x29a0 [ 616.613611][ T1168] ? io_sq_thread+0xe00/0xe00 [ 616.619225][ T1168] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.624086][ T1168] ? io_wake_function+0x2e0/0x2e0 [ 616.630128][ T1168] ? check_preemption_disabled+0x50/0x130 [ 616.636522][ T1168] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.642605][ T1168] ? lockdep_hardirqs_on+0x53/0x100 [ 616.649045][ T1168] do_syscall_64+0x2d/0x70 [ 616.653497][ T1168] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.660355][ T1168] RIP: 0033:0x440299 [ 616.664975][ T1168] Code: Bad RIP value. [ 616.669058][ T1168] RSP: 002b:00007ffdf857da68 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.678321][ T1168] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 616.686915][ T1168] RDX: 0000000000400b40 RSI: 0000000020000180 RDI: 0000000000002c43 [ 616.695957][ T1168] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.703936][ T1168] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 616.712789][ T1168] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 616.721810][ T1168] INFO: task io_uring-sq:6849 blocked for more than 143 seconds. [ 616.730098][ T1168] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.737698][ T1168] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.747334][ T1168] task:io_uring-sq state:D stack:31200 pid: 6849 ppid: 2 flags:0x00004000 [ 616.757368][ T1168] Call Trace: [ 616.760683][ T1168] __schedule+0xea9/0x2230 [ 616.766042][ T1168] ? io_schedule_timeout+0x140/0x140 [ 616.771351][ T1168] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.777921][ T1168] schedule+0xd0/0x2a0 [ 616.781994][ T1168] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.788604][ T1168] schedule_preempt_disabled+0xf/0x20 [ 616.794125][ T1168] kthread+0x2ac/0x4a0 [ 616.798733][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 616.803854][ T1168] ret_from_fork+0x1f/0x30 [ 616.808440][ T1168] [ 616.808440][ T1168] Showing all locks held in the system: [ 616.816371][ T1168] 1 lock held by khungtaskd/1168: [ 616.821513][ T1168] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.831517][ T1168] 1 lock held by in:imklog/6545: [ 616.836696][ T1168] [ 616.839150][ T1168] ============================================= [ 616.839150][ T1168] [ 616.848790][ T1168] NMI backtrace for cpu 0 [ 616.853158][ T1168] CPU: 0 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.862849][ T1168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.872897][ T1168] Call Trace: [ 616.876577][ T1168] dump_stack+0x198/0x1fd [ 616.880932][ T1168] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.886135][ T1168] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.891815][ T1168] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.897793][ T1168] watchdog+0xd89/0xf30 [ 616.901953][ T1168] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.907660][ T1168] kthread+0x3b5/0x4a0 [ 616.911722][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 616.916820][ T1168] ret_from_fork+0x1f/0x30 [ 616.921368][ T1168] Sending NMI from CPU 0 to CPUs 1: [ 616.926966][ C1] NMI backtrace for cpu 1 [ 616.926973][ C1] CPU: 1 PID: 3897 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.926980][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.926984][ C1] RIP: 0010:__kasan_check_read+0x0/0x10 [ 616.926996][ C1] Code: 6d 89 e8 b7 fc 08 00 48 8b 73 58 89 c2 48 c7 c7 f0 0c 6d 89 f7 da e8 27 83 a8 ff e9 a1 f5 ff ff cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 e3 2a 00 00 0f 1f 00 48 8b 0c 24 89 f6 [ 616.927000][ C1] RSP: 0018:ffffc9000519fc50 EFLAGS: 00000046 [ 616.927009][ C1] RAX: 1ffffd400049be09 RBX: ffffea00024df048 RCX: ffffffff81ac3d59 [ 616.927014][ C1] RDX: fffff9400049be0b RSI: 0000000000000004 RDI: ffffea00024df070 [ 616.927020][ C1] RBP: ffffea00024df070 R08: 0000000000000000 R09: ffffea00024df057 [ 616.927025][ C1] R10: fffff9400049be0a R11: 0000000000000000 R12: 0000000000000001 [ 616.927031][ C1] R13: dffffc0000000000 R14: ffffea00024df040 R15: ffffea00024df000 [ 616.927037][ C1] FS: 00007f0f87bc98c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 616.927041][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.927047][ C1] CR2: 00007f0f84f6e020 CR3: 0000000093fde000 CR4: 00000000001506e0 [ 616.927052][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.927057][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.927060][ C1] Call Trace: [ 616.927064][ C1] __free_pages_ok+0x63b/0xd20 [ 616.927067][ C1] slabs_destroy+0x89/0xc0 [ 616.927071][ C1] ___cache_free+0x4fb/0x740 [ 616.927075][ C1] qlist_free_all+0x98/0x170 [ 616.927078][ C1] quarantine_reduce+0x17e/0x200 [ 616.927083][ C1] __kasan_kmalloc.constprop.0+0x9e/0xd0 [ 616.927086][ C1] ? kmem_cache_alloc+0x269/0x3a0 [ 616.927090][ C1] kmem_cache_alloc+0x13a/0x3a0 [ 616.927094][ C1] prepare_creds+0x3b/0x730 [ 616.927097][ C1] do_faccessat+0x3d7/0x820 [ 616.927101][ C1] ? stream_open+0x60/0x60 [ 616.927105][ C1] ? __secure_computing+0x104/0x360 [ 616.927108][ C1] do_syscall_64+0x2d/0x70 [ 616.927112][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.927116][ C1] RIP: 0033:0x7f0f86e859c7 [ 616.927128][ C1] 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 [ 616.927132][ C1] RSP: 002b:00007ffc2857e718 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 616.927141][ C1] RAX: ffffffffffffffda RBX: 00007ffc28581630 RCX: 00007f0f86e859c7 [ 616.927147][ C1] RDX: 00007f0f878f6a00 RSI: 0000000000000000 RDI: 000056398e6a99a3 [ 616.927152][ C1] RBP: 00007ffc2857e750 R08: 0000000000000000 R09: 0000000000000000 [ 616.927158][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 616.927169][ C1] R13: 0000000000000000 R14: 00007ffc28581630 R15: 00007ffc2857ec40 [ 616.927668][ T1168] Kernel panic - not syncing: hung_task: blocked tasks [ 617.213228][ T1168] CPU: 0 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 617.222661][ T1168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.232878][ T1168] Call Trace: [ 617.236169][ T1168] dump_stack+0x198/0x1fd [ 617.240504][ T1168] panic+0x347/0x7c0 [ 617.244452][ T1168] ? __warn_printk+0xf3/0xf3 [ 617.249028][ T1168] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.254643][ T1168] ? preempt_schedule_thunk+0x16/0x18 [ 617.259998][ T1168] ? watchdog.cold+0x22d/0x24b [ 617.264743][ T1168] ? watchdog+0xc59/0xf30 [ 617.269054][ T1168] watchdog.cold+0x23e/0x24b [ 617.273744][ T1168] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.279469][ T1168] kthread+0x3b5/0x4a0 [ 617.283526][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 617.288622][ T1168] ret_from_fork+0x1f/0x30 [ 617.294031][ T1168] Kernel Offset: disabled [ 617.298364][ T1168] Rebooting in 86400 seconds..