[ 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 '10.128.10.63' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 717.649325] INFO: task syz-executor057:8093 blocked for more than 140 seconds. [ 717.656815] Not tainted 4.19.172-syzkaller #0 [ 717.663610] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.672097] syz-executor057 D26880 8093 8092 0x00000004 [ 717.677722] Call Trace: [ 717.681053] __schedule+0x887/0x2040 [ 717.684768] ? io_schedule_timeout+0x140/0x140 [ 717.690084] ? mark_held_locks+0xf0/0xf0 [ 717.694144] schedule+0x8d/0x1b0 [ 717.697495] schedule_timeout+0x92d/0xfe0 [ 717.702577] ? _raw_spin_unlock_irqrestore+0x79/0xe0 [ 717.707679] ? usleep_range+0x170/0x170 [ 717.712371] ? wait_for_common+0x294/0x470 [ 717.716622] ? lock_downgrade+0x720/0x720 [ 717.721493] ? lock_acquire+0x170/0x3c0 [ 717.725461] ? wait_for_common+0x9e/0x470 [ 717.730296] ? _raw_spin_unlock_irq+0x24/0x80 [ 717.734800] wait_for_common+0x29c/0x470 [ 717.738844] ? do_syscall_64+0xf9/0x620 [ 717.743740] ? bit_wait_io_timeout+0x100/0x100 [ 717.748316] ? __lock_acquire+0x6de/0x3ff0 [ 717.753250] ? wake_up_q+0xe0/0xe0 [ 717.756783] ? usb_submit_urb+0xb37/0x13b0 [ 717.761771] usb_start_wait_urb+0x14b/0x4c0 [ 717.766087] ? lock_acquire+0x170/0x3c0 [ 717.770717] ? usb_api_blocking_completion+0xa0/0xa0 [ 717.775823] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 717.781731] ? memset+0x20/0x40 [ 717.785006] usb_bulk_msg+0x226/0x550 [ 717.788831] proc_bulk+0x3de/0x860 [ 717.794238] ? proc_control+0x7f0/0x7f0 [ 717.798213] ? current_time+0x13c/0x1c0 [ 717.803553] ? page_remove_rmap.part.0+0x2f/0x2c0 [ 717.808414] usbdev_do_ioctl+0x696/0x3030 [ 717.813325] ? wp_page_copy+0x1203/0x2c40 [ 717.817484] ? proc_bulk+0x860/0x860 [ 717.821949] ? mark_held_locks+0xf0/0xf0 [ 717.826029] ? set_next_entity+0xb52/0x1dc0 [ 717.831150] ? pick_next_entity+0x27e/0x580 [ 717.835469] ? finish_task_switch+0x146/0x760 [ 717.840747] ? usbdev_compat_ioctl+0x30/0x30 [ 717.845160] usbdev_ioctl+0x21/0x30 [ 717.848783] do_vfs_ioctl+0xcdb/0x12e0 [ 717.853650] ? ioctl_preallocate+0x200/0x200 [ 717.858058] ? finish_task_switch+0x1db/0x760 [ 717.863320] ? __schedule+0x88f/0x2040 [ 717.867219] ? io_schedule_timeout+0x140/0x140 [ 717.872501] ? up_read+0x17/0x110 [ 717.875973] ? __do_page_fault+0x180/0xd60 [ 717.880911] ksys_ioctl+0x9b/0xc0 [ 717.884376] __x64_sys_ioctl+0x6f/0xb0 [ 717.888247] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.893805] do_syscall_64+0xf9/0x620 [ 717.897602] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 717.903471] RIP: 0033:0x444209 [ 717.906664] Code: Bad RIP value. [ 717.910687] RSP: 002b:00007fff0bb91248 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 717.918399] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000444209 [ 717.926824] RDX: 00000000200002c0 RSI: 00000000c0185502 RDI: 0000000000000003 [ 717.934590] RBP: 0000000000000000 R08: 00007fff0bb913e8 R09: 00007fff0bb913e8 [ 717.942389] R10: 00007fff0bb90cc0 R11: 0000000000000246 R12: 0000000000403520 [ 717.950150] R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 [ 717.957450] [ 717.957450] Showing all locks held in the system: [ 717.964510] 1 lock held by khungtaskd/1566: [ 717.968828] #0: 00000000ddfb48e3 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 717.978198] 1 lock held by in:imklog/7742: [ 717.982880] #0: 00000000c2f8398a (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 717.991458] [ 717.993177] ============================================= [ 717.993177] [ 718.001028] NMI backtrace for cpu 1 [ 718.004661] CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0 [ 718.012085] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.021442] Call Trace: [ 718.024021] dump_stack+0x1fc/0x2ef [ 718.027630] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.032108] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.036597] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.041869] watchdog+0x991/0xe60 [ 718.045320] ? reset_hung_task_detector+0x30/0x30 [ 718.050159] kthread+0x33f/0x460 [ 718.053518] ? kthread_park+0x180/0x180 [ 718.057474] ret_from_fork+0x24/0x30 [ 718.061497] Sending NMI from CPU 1 to CPUs 0: [ 718.066432] NMI backtrace for cpu 0 [ 718.066439] CPU: 0 PID: 4691 Comm: systemd-journal Not tainted 4.19.172-syzkaller #0 [ 718.066446] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.066450] RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 [ 718.066461] Code: e8 a1 b7 35 00 e9 ab fe ff ff 4c 89 ef e8 94 b7 35 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 8b 34 24 <65> 48 8b 04 25 80 df 01 00 65 8b 15 3c 85 9f 7e 81 e2 00 01 1f 00 [ 718.066466] RSP: 0018:ffff8880a0e1fb68 EFLAGS: 00000246 [ 718.066474] RAX: 0000000000000000 RBX: 1ffff110141c3f98 RCX: ffffffff81a1b402 [ 718.066479] RDX: 0000000000000041 RSI: ffffffff81a6165a RDI: ffff8880a0e1fce0 [ 718.066485] RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 [ 718.066490] R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a0e14540 [ 718.066502] R13: ffff8880a0e1fce0 R14: 0000000000000001 R15: ffff8880a0e1fe90 [ 718.066508] FS: 00007f87ace008c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 718.066512] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.066518] CR2: 00007f87aa1d2000 CR3: 00000000a0c2b000 CR4: 00000000001406f0 [ 718.066523] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.066528] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.066532] Call Trace: [ 718.066536] path_openat+0x8a/0x2df0 [ 718.066539] ? __lock_acquire+0x6de/0x3ff0 [ 718.066543] ? path_lookupat+0x8d0/0x8d0 [ 718.066548] ? __put_seccomp_filter+0xa0/0xa0 [ 718.066551] ? mark_held_locks+0xf0/0xf0 [ 718.066555] do_filp_open+0x18c/0x3f0 [ 718.066559] ? may_open_dev+0xf0/0xf0 [ 718.066563] ? __alloc_fd+0x28d/0x570 [ 718.066566] ? lock_downgrade+0x720/0x720 [ 718.066570] ? lock_acquire+0x170/0x3c0 [ 718.066574] ? __alloc_fd+0x34/0x570 [ 718.066578] ? do_raw_spin_unlock+0x171/0x230 [ 718.066582] ? _raw_spin_unlock+0x29/0x40 [ 718.066586] ? __alloc_fd+0x28d/0x570 [ 718.066589] do_sys_open+0x3b3/0x520 [ 718.066593] ? filp_open+0x70/0x70 [ 718.066598] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.066602] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.066606] ? do_syscall_64+0x21/0x620 [ 718.066609] do_syscall_64+0xf9/0x620 [ 718.066614] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.066617] RIP: 0033:0x7f87ac390840 [ 718.066628] 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 [ 718.066632] RSP: 002b:00007ffe20bf28b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 718.066642] RAX: ffffffffffffffda RBX: 00007ffe20bf2bc0 RCX: 00007f87ac390840 [ 718.066647] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055aeb81c0680 [ 718.066652] RBP: 000000000000000d R08: 000000000000ffc0 R09: 00000000ffffffff [ 718.066658] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 718.066663] R13: 000055aeb81b3040 R14: 00007ffe20bf2b80 R15: 000055aeb81b9b20 [ 718.067082] Kernel panic - not syncing: hung_task: blocked tasks [ 718.351152] CPU: 1 PID: 1566 Comm: khungtaskd Not tainted 4.19.172-syzkaller #0 [ 718.358583] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.367924] Call Trace: [ 718.370518] dump_stack+0x1fc/0x2ef [ 718.374143] panic+0x26a/0x50e [ 718.377317] ? __warn_printk+0xf3/0xf3 [ 718.381188] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.385666] ? ___preempt_schedule+0x16/0x18 [ 718.390065] ? watchdog+0x991/0xe60 [ 718.393681] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.399122] watchdog+0x9a2/0xe60 [ 718.402600] ? reset_hung_task_detector+0x30/0x30 [ 718.407438] kthread+0x33f/0x460 [ 718.410800] ? kthread_park+0x180/0x180 [ 718.414772] ret_from_fork+0x24/0x30 [ 718.419114] Kernel Offset: disabled [ 718.422729] Rebooting in 86400 seconds..