[ 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 '10.128.0.81' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 636.700270][ T1164] INFO: task syz-executor113:6877 blocked for more than 143 seconds. [ 636.708523][ T1164] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 636.717239][ T1164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.726258][ T1164] task:syz-executor113 state:D stack:28104 pid: 6877 ppid: 6871 flags:0x00004000 [ 636.735657][ T1164] Call Trace: [ 636.739098][ T1164] __schedule+0xea9/0x2230 [ 636.743680][ T1164] ? io_schedule_timeout+0x140/0x140 [ 636.748985][ T1164] ? lockdep_hardirqs_on+0x53/0x100 [ 636.754255][ T1164] schedule+0xd0/0x2a0 [ 636.758619][ T1164] schedule_timeout+0x1d8/0x250 [ 636.763608][ T1164] ? usleep_range+0x170/0x170 [ 636.768406][ T1164] ? lock_downgrade+0x830/0x830 [ 636.775000][ T1164] ? do_raw_spin_lock+0x120/0x2b0 [ 636.780160][ T1164] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.785365][ T1164] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 636.791418][ T1164] ? _raw_spin_unlock_irq+0x1f/0x80 [ 636.796629][ T1164] wait_for_completion+0x163/0x260 [ 636.801874][ T1164] ? wait_for_completion_interruptible+0x2e0/0x2e0 [ 636.808463][ T1164] ? apparmor_capable+0x1d8/0x460 [ 636.813632][ T1164] ? security_capable+0x8f/0xc0 [ 636.818691][ T1164] io_uring_setup+0x1495/0x29a0 [ 636.823699][ T1164] ? io_sq_thread+0xe00/0xe00 [ 636.828378][ T1164] ? io_issue_sqe+0x5bb0/0x5bb0 [ 636.833279][ T1164] ? io_wake_function+0x2e0/0x2e0 [ 636.838464][ T1164] ? check_preemption_disabled+0x50/0x130 [ 636.844339][ T1164] ? syscall_enter_from_user_mode+0x20/0x290 [ 636.850414][ T1164] ? lockdep_hardirqs_on+0x53/0x100 [ 636.855711][ T1164] do_syscall_64+0x2d/0x70 [ 636.860277][ T1164] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 636.866357][ T1164] RIP: 0033:0x440299 [ 636.870325][ T1164] Code: Bad RIP value. [ 636.874398][ T1164] RSP: 002b:00007ffc8ccb8da8 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 [ 636.882967][ T1164] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440299 [ 636.891070][ T1164] RDX: 0000000000400b40 RSI: 0000000020000080 RDI: 000000000000246a [ 636.899047][ T1164] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 636.907171][ T1164] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000401aa0 [ 636.915212][ T1164] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 636.923382][ T1164] INFO: task io_uring-sq:6878 blocked for more than 143 seconds. [ 636.931228][ T1164] Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 636.938243][ T1164] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 636.946985][ T1164] task:io_uring-sq state:D stack:31200 pid: 6878 ppid: 2 flags:0x00004000 [ 636.956290][ T1164] Call Trace: [ 636.959599][ T1164] __schedule+0xea9/0x2230 [ 636.964106][ T1164] ? io_schedule_timeout+0x140/0x140 [ 636.969407][ T1164] ? _raw_spin_unlock_irqrestore+0x6f/0x90 [ 636.975306][ T1164] schedule+0xd0/0x2a0 [ 636.979399][ T1164] ? __do_sys_io_uring_enter+0x1940/0x1940 [ 636.985480][ T1164] schedule_preempt_disabled+0xf/0x20 [ 636.991023][ T1164] kthread+0x2ac/0x4a0 [ 636.995109][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 637.000378][ T1164] ret_from_fork+0x1f/0x30 [ 637.004823][ T1164] [ 637.004823][ T1164] Showing all locks held in the system: [ 637.012619][ T1164] 1 lock held by khungtaskd/1164: [ 637.017660][ T1164] #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.027621][ T1164] [ 637.030014][ T1164] ============================================= [ 637.030014][ T1164] [ 637.038447][ T1164] NMI backtrace for cpu 0 [ 637.042863][ T1164] CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.052318][ T1164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.062351][ T1164] Call Trace: [ 637.065727][ T1164] dump_stack+0x198/0x1fd [ 637.070048][ T1164] nmi_cpu_backtrace.cold+0x44/0xd7 [ 637.075274][ T1164] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 637.080906][ T1164] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 637.086934][ T1164] watchdog+0xd89/0xf30 [ 637.091078][ T1164] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.096781][ T1164] kthread+0x3b5/0x4a0 [ 637.100829][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 637.105932][ T1164] ret_from_fork+0x1f/0x30 [ 637.110458][ T1164] Sending NMI from CPU 0 to CPUs 1: [ 637.116253][ C1] NMI backtrace for cpu 1 [ 637.116262][ C1] CPU: 1 PID: 3901 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.116268][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.116273][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 [ 637.116286][ C1] Code: 5d be 03 00 00 00 e9 56 f4 28 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 <65> 8b 05 70 1b 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 [ 637.116290][ C1] RSP: 0018:ffffc90001047c28 EFLAGS: 00000293 [ 637.116300][ C1] RAX: 0000000000000000 RBX: ffffc90001047d18 RCX: ffffffff81c37a33 [ 637.116305][ C1] RDX: ffff8880938a6340 RSI: ffffffff81c3797d RDI: ffff8880938a66b8 [ 637.116311][ C1] RBP: 0000000000000001 R08: 0000000000000000 R09: ffff88809a6e56b3 [ 637.116317][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809a6e5620 [ 637.116323][ C1] R13: ffffc90001047d20 R14: 0000000000000040 R15: fffff52000208fac [ 637.116329][ C1] FS: 00007f1ec55808c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 637.116334][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 637.116340][ C1] CR2: 00007f1ec2924000 CR3: 00000000939e6000 CR4: 00000000001506e0 [ 637.116345][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 637.116351][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 637.116354][ C1] Call Trace: [ 637.116358][ C1] unlazy_walk+0x167/0x3a0 [ 637.116362][ C1] complete_walk+0xc6/0x2d0 [ 637.116367][ C1] path_lookupat+0x278/0x830 [ 637.116371][ C1] filename_lookup+0x19f/0x560 [ 637.116375][ C1] ? may_linkat+0x2b0/0x2b0 [ 637.116379][ C1] ? __check_object_size+0x171/0x3e4 [ 637.116384][ C1] ? strncpy_from_user+0x2bf/0x3e0 [ 637.116388][ C1] ? getname_flags.part.0+0x1dd/0x4f0 [ 637.116393][ C1] ? security_prepare_creds+0xe6/0x190 [ 637.116397][ C1] do_faccessat+0x129/0x820 [ 637.116401][ C1] ? stream_open+0x60/0x60 [ 637.116405][ C1] ? __secure_computing+0x104/0x360 [ 637.116409][ C1] do_syscall_64+0x2d/0x70 [ 637.116414][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.116418][ C1] RIP: 0033:0x7f1ec483c9c7 [ 637.116429][ 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 [ 637.116434][ C1] RSP: 002b:00007ffccd397ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 [ 637.116444][ C1] RAX: ffffffffffffffda RBX: 00007ffccd39ac00 RCX: 00007f1ec483c9c7 [ 637.116449][ C1] RDX: 00007f1ec52ada00 RSI: 0000000000000000 RDI: 000055cd7d0e49a3 [ 637.116455][ C1] RBP: 00007ffccd397d20 R08: 0000000000000000 R09: 0000000000000000 [ 637.116461][ C1] R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 [ 637.116467][ C1] R13: 0000000000000000 R14: 00007ffccd39ac00 R15: 00007ffccd398210 [ 637.116678][ T1164] Kernel panic - not syncing: hung_task: blocked tasks [ 637.404231][ T1164] CPU: 0 PID: 1164 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 [ 637.413656][ T1164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.423690][ T1164] Call Trace: [ 637.426967][ T1164] dump_stack+0x198/0x1fd [ 637.431332][ T1164] panic+0x347/0x7c0 [ 637.435227][ T1164] ? __warn_printk+0xf3/0xf3 [ 637.439809][ T1164] ? cpumask_next+0x3c/0x40 [ 637.444313][ T1164] ? printk_safe_flush+0xd6/0x120 [ 637.449329][ T1164] ? watchdog.cold+0x22d/0x24b [ 637.454078][ T1164] ? watchdog+0xc59/0xf30 [ 637.458385][ T1164] watchdog.cold+0x23e/0x24b [ 637.462955][ T1164] ? trace_sched_process_hang+0x2e0/0x2e0 [ 637.468651][ T1164] kthread+0x3b5/0x4a0 [ 637.472708][ T1164] ? __kthread_bind_mask+0xc0/0xc0 [ 637.477813][ T1164] ret_from_fork+0x1f/0x30 [ 637.482950][ T1164] Kernel Offset: disabled [ 637.487276][ T1164] Rebooting in 86400 seconds..