[ 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 '10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 616.257351][ T1173] INFO: task syz-executor465:6875 blocked for more than 143 seconds. [ 616.265566][ T1173] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.273317][ T1173] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.282099][ T1173] task:syz-executor465 state:D stack:28104 pid: 6875 ppid: 6869 flags:0x00004000 [ 616.291387][ T1173] Call Trace: [ 616.294744][ T1173] __schedule+0xea9/0x2230 [ 616.299229][ T1173] ? io_schedule_timeout+0x140/0x140 [ 616.304529][ T1173] ? lockdep_hardirqs_on+0x53/0x100 [ 616.309798][ T1173] schedule+0xd0/0x2a0 [ 616.313874][ T1173] schedule_timeout+0x1d8/0x250 [ 616.318789][ T1173] ? usleep_range+0x170/0x170 [ 616.323475][ T1173] ? lock_downgrade+0x830/0x830 [ 616.328407][ T1173] ? do_raw_spin_lock+0x120/0x2b0 [ 616.333528][ T1173] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.338782][ T1173] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 616.344770][ T1173] ? _raw_spin_unlock_irq+0x1f/0x80 [ 616.350049][ T1173] wait_for_completion+0x163/0x260 [ 616.355180][ T1173] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 616.361751][ T1173] ? apparmor_capable+0x1d8/0x460 [ 616.367253][ T1173] ? security_capable+0x8f/0xc0 [ 616.372108][ T1173] io_uring_setup+0x1495/0x29a0 [ 616.376954][ T1173] ? io_sq_thread+0xe00/0xe00 [ 616.381688][ T1173] ? io_issue_sqe+0x5bb0/0x5bb0 [ 616.386536][ T1173] ? io_wake_function+0x2e0/0x2e0 [ 616.391650][ T1173] ? check_preemption_disabled+0x50/0x130 [ 616.397458][ T1173] ? syscall_enter_from_user_mode+0x20/0x290 [ 616.403449][ T1173] ? lockdep_hardirqs_on+0x53/0x100 [ 616.408817][ T1173] do_syscall_64+0x2d/0x70 [ 616.413250][ T1173] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.419194][ T1173] RIP: 0033:0x440229 [ 616.423102][ T1173] Code: Bad RIP value. [ 616.427250][ T1173] RSP: 002b:00007fff156e8618 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 616.435665][ T1173] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440229 [ 616.443736][ T1173] RDX: 0000000000400ad0 RSI: 0000000020000000 RDI: 00000000000079dd [ 616.451813][ T1173] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 616.459882][ T1173] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401a30 [ 616.467955][ T1173] R13: 0000000000401ac0 R14: 0000000000000000 R15: 0000000000000000 [ 616.475971][ T1173] INFO: task io_uring-sq:6876 blocked for more than 143 seconds. [ 616.483949][ T1173] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.491093][ T1173] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 616.499941][ T1173] task:io_uring-sq state:D stack:31200 pid: 6876 ppid: 2 flags:0x00004000 [ 616.509290][ T1173] Call Trace: [ 616.512611][ T1173] __schedule+0xea9/0x2230 [ 616.517016][ T1173] ? io_schedule_timeout+0x140/0x140 [ 616.522393][ T1173] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 616.528298][ T1173] schedule+0xd0/0x2a0 [ 616.532364][ T1173] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 616.538236][ T1173] schedule_preempt_disabled+0xf/0x20 [ 616.543617][ T1173] kthread+0x2ac/0x4a0 [ 616.547759][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 616.552875][ T1173] ret_from_fork+0x1f/0x30 [ 616.557392][ T1173] [ 616.557392][ T1173] Showing all locks held in the system: [ 616.565107][ T1173] 1 lock held by khungtaskd/1173: [ 616.570197][ T1173] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 616.580181][ T1173] 1 lock held by in:imklog/6552: [ 616.585108][ T1173] #0: ffff88809708e0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 616.594306][ T1173] [ 616.596635][ T1173] ============================================= [ 616.596635][ T1173] [ 616.605097][ T1173] NMI backtrace for cpu 0 [ 616.609502][ T1173] CPU: 0 PID: 1173 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.618953][ T1173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.629004][ T1173] Call Trace: [ 616.632339][ T1173] dump_stack+0x198/0x1fd [ 616.636655][ T1173] nmi_cpu_backtrace.cold+0x44/0xd7 [ 616.641867][ T1173] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 616.647481][ T1173] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 616.653439][ T1173] watchdog+0xd89/0xf30 [ 616.657574][ T1173] ? trace_sched_process_hang+0x2e0/0x2e0 [ 616.663270][ T1173] kthread+0x3b5/0x4a0 [ 616.667330][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 616.672420][ T1173] ret_from_fork+0x1f/0x30 [ 616.676951][ T1173] Sending NMI from CPU 0 to CPUs 1: [ 616.682755][ C1] NMI backtrace for cpu 1 [ 616.682763][ C1] CPU: 1 PID: 3911 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 616.682770][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 616.682775][ C1] RIP: 0010:format_decode+0x1dc/0xad0 [ 616.682786][ C1] Code: 44 24 38 c6 45 04 00 48 89 04 24 e8 de 45 be fd 48 8b 04 24 48 b9 00 00 00 00 00 fc ff df 4c 8d 60 01 4c 89 e0 4c 89 64 24 38 <4c> 89 e2 48 c1 e8 03 83 e2 07 0f b6 04 08 38 d0 7f 08 84 c0 0f 85 [ 616.682791][ C1] RSP: 0018:ffffc90005527a10 EFLAGS: 00000093 [ 616.682801][ C1] RAX: ffffffff884c6661 RBX: ffffffff884c6660 RCX: dffffc0000000000 [ 616.682807][ C1] RDX: ffff888092cc8080 RSI: ffffffff83b69d22 RDI: 0000000000000001 [ 616.682812][ C1] RBP: ffffc90005527b28 R08: 0000000000000610 R09: 0000000024c1aca4 [ 616.682818][ C1] R10: 0000000000000025 R11: 0000000000000000 R12: ffffffff884c6661 [ 616.682824][ C1] R13: ffffffff884c6660 R14: 1ffff92000aa4f45 R15: 0000000000000025 [ 616.682830][ C1] FS: 00007f9dcd4d58c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 616.682835][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 616.682840][ C1] CR2: 00007f9dca879000 CR3: 00000000a920d000 CR4: 00000000001506e0 [ 616.682846][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 616.682852][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 616.682855][ C1] Call Trace: [ 616.682860][ C1] ? enable_ptr_key_workfn+0x30/0x30 [ 616.682864][ C1] vsnprintf+0x155/0x14f0 [ 616.682868][ C1] ? pointer+0x970/0x970 [ 616.682871][ C1] ? memcpy+0x39/0x60 [ 616.682876][ C1] ? desc_read.isra.0+0x127/0x1a0 [ 616.682879][ C1] scnprintf+0xbb/0x140 [ 616.682884][ C1] ? va_format.constprop.0+0x380/0x380 [ 616.682888][ C1] ? data_alloc+0x4c0/0x4c0 [ 616.682893][ C1] info_print_ext_header.constprop.0+0x1e2/0x270 [ 616.682898][ C1] ? __add_preferred_console.constprop.0+0x240/0x240 [ 616.682902][ C1] ? prb_first_valid_seq+0x97/0xd0 [ 616.682907][ C1] ? prb_read_valid_info+0xe0/0xe0 [ 616.682911][ C1] devkmsg_read+0x436/0xa50 [ 616.682915][ C1] ? wake_up_klogd_work_func+0xf0/0xf0 [ 616.682920][ C1] ? security_file_permission+0x248/0x560 [ 616.682924][ C1] ? wake_up_klogd_work_func+0xf0/0xf0 [ 616.682928][ C1] vfs_read+0x1df/0x5a0 [ 616.682932][ C1] ksys_read+0x12d/0x250 [ 616.682936][ C1] ? vfs_write+0x730/0x730 [ 616.682941][ C1] ? __secure_computing+0x104/0x360 [ 616.682944][ C1] do_syscall_64+0x2d/0x70 [ 616.682949][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 616.682953][ C1] RIP: 0033:0x7f9dcca65210 [ 616.682964][ C1] Code: 73 01 c3 48 8b 0d 98 7d 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d b9 c1 20 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 [ 616.682969][ C1] RSP: 002b:00007ffe3cc12ac8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 616.682979][ C1] RAX: ffffffffffffffda RBX: 00007ffe3cc15540 RCX: 00007f9dcca65210 [ 616.682984][ C1] RDX: 0000000000002000 RSI: 00007ffe3cc13340 RDI: 0000000000000009 [ 616.682990][ C1] RBP: 0000000000000000 R08: 0000000000000008 R09: 00007ffe3cd630f0 [ 616.682996][ C1] R10: 000000000001b726 R11: 0000000000000246 R12: 00007ffe3cc13340 [ 616.683001][ C1] R13: 00007ffe3cc15498 R14: 000055f127e54958 R15: 0005ae7a517917cf [ 616.683225][ T1173] Kernel panic - not syncing: hung_task: blocked tasks [ 617.008375][ T1173] CPU: 0 PID: 1173 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 617.017827][ T1173] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 617.027883][ T1173] Call Trace: [ 617.031161][ T1173] dump_stack+0x198/0x1fd [ 617.035472][ T1173] panic+0x347/0x7c0 [ 617.039393][ T1173] ? __warn_printk+0xf3/0xf3 [ 617.043972][ T1173] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 617.049592][ T1173] ? preempt_schedule_thunk+0x16/0x18 [ 617.054956][ T1173] ? watchdog.cold+0x22d/0x24b [ 617.059708][ T1173] ? watchdog+0xc59/0xf30 [ 617.064214][ T1173] watchdog.cold+0x23e/0x24b [ 617.068786][ T1173] ? trace_sched_process_hang+0x2e0/0x2e0 [ 617.074484][ T1173] kthread+0x3b5/0x4a0 [ 617.078536][ T1173] ? __kthread_bind_mask+0xc0/0xc0 [ 617.083658][ T1173] ret_from_fork+0x1f/0x30 [ 617.089394][ T1173] Kernel Offset: disabled [ 617.093716][ T1173] Rebooting in 86400 seconds..