Warning: Permanently added '10.128.0.111' (ECDSA) to the list of known hosts. executing program [ 857.986365] INFO: task syz-executor160:8002 blocked for more than 140 seconds. [ 857.993865] Not tainted 4.14.279-syzkaller #0 [ 857.999918] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.008267] syz-executor160 D26560 8002 8001 0x00000004 [ 858.013885] Call Trace: [ 858.017029] __schedule+0x88b/0x1de0 [ 858.020733] ? io_schedule_timeout+0x140/0x140 [ 858.025303] ? trace_hardirqs_on+0x10/0x10 [ 858.030351] schedule+0x8d/0x1b0 [ 858.033713] schedule_timeout+0x80a/0xe90 [ 858.038460] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 858.043468] ? usleep_range+0x130/0x130 [ 858.048007] ? wait_for_common+0x26a/0x430 [ 858.052236] ? lock_acquire+0x170/0x3f0 [ 858.056940] ? lock_downgrade+0x740/0x740 [ 858.061087] ? _raw_spin_unlock_irq+0x24/0x80 [ 858.065568] wait_for_common+0x272/0x430 [ 858.070392] ? out_of_line_wait_on_atomic_t+0x1a0/0x1a0 [ 858.075747] ? wake_up_q+0xd0/0xd0 [ 858.079823] usb_start_wait_urb+0x125/0x440 [ 858.084136] ? usb_api_blocking_completion+0xa0/0xa0 [ 858.089791] ? __kmalloc+0x3a4/0x400 [ 858.093492] ? usb_alloc_urb+0x1f/0x130 [ 858.098012] ? memset+0x20/0x40 [ 858.101281] usb_bulk_msg+0x1f6/0x500 [ 858.105062] proc_bulk+0x331/0x6d0 [ 858.109353] ? proc_control+0x670/0x670 [ 858.113319] ? timespec_trunc+0xb7/0x120 [ 858.117908] ? put_timespec64+0xf0/0xf0 [ 858.121867] ? current_kernel_time64+0x154/0x230 [ 858.127836] ? __lock_acquire+0x5fc/0x3f20 [ 858.132065] usbdev_do_ioctl+0x5b0/0x2b70 [ 858.136799] ? proc_bulk+0x6d0/0x6d0 [ 858.140594] ? trace_hardirqs_on+0x10/0x10 [ 858.144808] ? check_preemption_disabled+0x35/0x240 [ 858.150572] ? __switch_to_xtra+0x93/0x12f0 [ 858.154882] ? finish_task_switch+0x178/0x610 [ 858.159891] ? lock_downgrade+0x740/0x740 [ 858.164026] ? _raw_spin_unlock_irq+0x24/0x80 [ 858.169051] ? usbdev_compat_ioctl+0x30/0x30 [ 858.173474] usbdev_ioctl+0x21/0x30 [ 858.177607] do_vfs_ioctl+0x75a/0xff0 [ 858.181393] ? ioctl_preallocate+0x1a0/0x1a0 [ 858.185778] ? io_schedule_timeout+0x140/0x140 [ 858.191033] ? security_file_ioctl+0x83/0xb0 [ 858.195426] SyS_ioctl+0x7f/0xb0 [ 858.199303] ? do_vfs_ioctl+0xff0/0xff0 [ 858.203262] do_syscall_64+0x1d5/0x640 [ 858.207667] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.212840] RIP: 0033:0x7fb8321aa3b9 [ 858.217066] RSP: 002b:00007ffd26dbd498 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 858.224764] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb8321aa3b9 [ 858.232543] RDX: 0000000020000200 RSI: 00000000c0185502 RDI: 0000000000000003 [ 858.240139] RBP: 0000000000000000 R08: 00007ffd26dbd638 R09: 00007ffd26dbd638 [ 858.247760] R10: 00007ffd26dbcf10 R11: 0000000000000246 R12: 00007fb8321696d0 [ 858.255021] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 858.262944] [ 858.262944] Showing all locks held in the system: [ 858.269647] 1 lock held by khungtaskd/1534: [ 858.273995] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.283113] [ 858.284728] ============================================= [ 858.284728] [ 858.291832] NMI backtrace for cpu 1 [ 858.295579] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.279-syzkaller #0 [ 858.303001] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.312542] Call Trace: [ 858.315119] dump_stack+0x1b2/0x281 [ 858.318722] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.323195] ? irq_force_complete_move+0x350/0x350 [ 858.328108] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.333377] watchdog+0x5b9/0xb40 [ 858.336810] ? hungtask_pm_notify+0x50/0x50 [ 858.341112] kthread+0x30d/0x420 [ 858.344464] ? kthread_create_on_node+0xd0/0xd0 [ 858.349112] ret_from_fork+0x24/0x30 [ 858.352895] Sending NMI from CPU 1 to CPUs 0: [ 858.358387] NMI backtrace for cpu 0 [ 858.358391] CPU: 0 PID: 3 Comm: kworker/0:0 Not tainted 4.14.279-syzkaller #0 [ 858.358394] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.358397] Workqueue: events_long gc_worker [ 858.358401] task: ffff8880b5fe80c0 task.stack: ffff8880b5ff0000 [ 858.358403] RIP: 0010:lock_release+0x139/0x870 [ 858.358406] RSP: 0018:ffff8880b5ff7c48 EFLAGS: 00000046 [ 858.358410] RAX: 0000000000000007 RBX: 1ffff11016bfef8c RCX: 0000000000006449 [ 858.358413] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8880b5fe8944 [ 858.358416] RBP: ffffffff8a09e348 R08: ffffffff8b9d7d08 R09: 00000000000e036f [ 858.358419] R10: 0000000000000000 R11: ffff8880b5fe80c0 R12: ffffffff81365063 [ 858.358423] R13: ffff8880b5fe80c0 R14: 0000000000010000 R15: 0000000000000000 [ 858.358426] FS: 0000000000000000(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 [ 858.358429] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 858.358432] CR2: 00007fc45c6ad000 CR3: 00000000a1ff0000 CR4: 00000000003406f0 [ 858.358435] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 858.358438] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 858.358439] Call Trace: [ 858.358442] ? lock_downgrade+0x740/0x740 [ 858.358444] gc_worker+0x201/0xb50 [ 858.358446] ? process_one_work+0x793/0x14a0 [ 858.358448] process_one_work+0x793/0x14a0 [ 858.358450] ? work_busy+0x320/0x320 [ 858.358452] ? worker_thread+0x158/0xff0 [ 858.358455] ? _raw_spin_unlock_irq+0x24/0x80 [ 858.358457] worker_thread+0x5cc/0xff0 [ 858.358459] ? rescuer_thread+0xc80/0xc80 [ 858.358461] kthread+0x30d/0x420 [ 858.358463] ? kthread_create_on_node+0xd0/0xd0 [ 858.358465] ret_from_fork+0x24/0x30 [ 858.358466] Code: 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 fa 04 00 00 <41> c7 85 84 08 00 00 01 00 00 00 0f 1f 44 00 00 65 8b 05 00 52 [ 858.359159] Kernel panic - not syncing: hung_task: blocked tasks [ 858.546837] CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.279-syzkaller #0 [ 858.554254] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.563583] Call Trace: [ 858.566154] dump_stack+0x1b2/0x281 [ 858.569757] panic+0x1f9/0x42d [ 858.572926] ? add_taint.cold+0x16/0x16 [ 858.576881] watchdog+0x5ca/0xb40 [ 858.580310] ? hungtask_pm_notify+0x50/0x50 [ 858.584609] kthread+0x30d/0x420 [ 858.587954] ? kthread_create_on_node+0xd0/0xd0 [ 858.592600] ret_from_fork+0x24/0x30 [ 858.596571] Kernel Offset: disabled [ 858.600188] Rebooting in 86400 seconds..