INFO: task syz-executor.0:10559 blocked for more than 143 seconds.
      Not tainted 5.12.0-rc8-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:28520 pid:10559 ppid:  8394 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:4322 [inline]
 __schedule+0x911/0x21b0 kernel/sched/core.c:5073
 schedule+0xcf/0x270 kernel/sched/core.c:5152
 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion_timeout+0x163/0x280 kernel/sched/completion.c:157
 usb_start_wait_urb+0x144/0x4c0 drivers/usb/core/message.c:63
 usb_bulk_msg+0x226/0x550 drivers/usb/core/message.c:387
 do_proc_bulk+0x3a3/0x750 drivers/usb/core/devio.c:1231
 proc_bulk drivers/usb/core/devio.c:1268 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2542 [inline]
 usbdev_ioctl+0x586/0x36c0 drivers/usb/core/devio.c:2708
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
RSP: 002b:00007f096b6ce188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665f9
RDX: 0000000020000000 RSI: 00000000c0185502 RDI: 0000000000000005
RBP: 00000000004bfbb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff6c0c440f R14: 00007f096b6ce300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1618:
 #0: ffffffff8bf74360 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6328
1 lock held by in:imklog/8083:
 #0: ffff888014634af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974

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

NMI backtrace for cpu 0
CPU: 0 PID: 1618 Comm: khungtaskd Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x141/0x1d7 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd48/0xfb0 kernel/hung_task.c:294
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2935 Comm: kworker/1:2 Not tainted 5.12.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient gc_worker
RIP: 0010:check_kcov_mode+0x7/0x40 kernel/kcov.c:163
Code: fe ff ff 48 89 df e8 38 c3 43 00 e9 a1 fe ff ff 48 8b 3c 24 e8 2a c3 43 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 a9 02 8e 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b
RSP: 0018:ffffc90002367c90 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 1ffff1100341113d RSI: ffff88801a088000 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8fa9a8a7
R10: ffffffff873ee5ca R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000010000 R14: 0000000000000000 R15: 0000000000000200
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3089688000 CR3: 000000002640c000 CR4: 0000000000350ee0
Call Trace:
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_const_cmp4+0x1c/0x70 kernel/kcov.c:284
 rcu_read_lock include/linux/rcupdate.h:657 [inline]
 gc_worker+0x14a/0xc90 net/netfilter/nf_conntrack_core.c:1372
 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294