RDX: 0000000000000000 RSI: 00007f1330346d40 RDI: 00000000ffffff9c
RBP: 00007f1330346d40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 00007ffce3ef279f R14: 00007f1330347300 R15: 0000000000022000
INFO: task syz-executor.5:8859 blocked for more than 140 seconds.
      Not tainted 4.14.280-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28880  8859   7982 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3387
 schedule+0x8d/0x1b0 kernel/sched/core.c:3431
 schedule_timeout+0x4af/0xe90 kernel/time/timer.c:1747
 do_wait_for_common kernel/sched/completion.c:91 [inline]
 __wait_for_common kernel/sched/completion.c:112 [inline]
 wait_for_common+0x272/0x430 kernel/sched/completion.c:123
 usb_start_wait_urb+0x125/0x440 drivers/usb/core/message.c:61
 usb_bulk_msg+0x1f6/0x500 drivers/usb/core/message.c:252
 proc_bulk+0x331/0x6d0 drivers/usb/core/devio.c:1223
 usbdev_do_ioctl+0x5b0/0x2b70 drivers/usb/core/devio.c:2449
 usbdev_ioctl+0x21/0x30 drivers/usb/core/devio.c:2599
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f738e11b0e9
RSP: 002b:00007f738ca90168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f738e22df60 RCX: 00007f738e11b0e9
RDX: 0000000020000280 RSI: 00000000c0185502 RDI: 0000000000000003
RBP: 00007f738e17508d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffc5c61fcf R14: 00007f738ca90300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1534:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff87026b2c>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1534 Comm: khungtaskd Not tainted 4.14.280-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5b9/0xb40 kernel/hung_task.c:274
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff87246a1e