------------[ cut here ]------------
pwq_busy(pwq)
WARNING: kernel/workqueue.c:6173 at destroy_workqueue+0x329/0xa30 kernel/workqueue.c:6173, CPU#1: syz.2.490/7238
Modules linked in:
CPU: 1 UID: 0 PID: 7238 Comm: syz.2.490 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:destroy_workqueue+0x329/0xa30 kernel/workqueue.c:6173
Code: 8d 5c 24 68 48 89 d8 48 c1 e8 03 42 80 3c 28 00 0f 85 80 06 00 00 49 8b 44 24 68 48 39 c3 0f 84 84 00 00 00 e8 a8 67 3a 00 90 <0f> 0b 90 48 c7 c6 e0 33 ee 8b 49 8d 96 70 01 00 00 48 c7 c7 80 23
RSP: 0018:ffffc90024d17d18 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff8880202d5024 RCX: 0000000000000001
RDX: ffff88802efb0000 RSI: ffffffff81d1b808 RDI: ffff88802efb0000
RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880202d5000
R13: dffffc0000000000 R14: ffff88802d717000 R15: 0000000000000001
FS:  000055557a4f1500(0000) GS:ffff8880d5c59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb058227dac CR3: 00000000259c2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 nci_unregister_device+0x87/0x330 net/nfc/nci/core.c:1332
 virtual_ncidev_close+0x4b/0xa0 drivers/nfc/virtual_ncidev.c:168
 __fput+0x3ff/0xb50 fs/file_table.c:512
 task_work_run+0x150/0x240 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x700 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb057f9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffca775e428 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fb058227da0 RCX: 00007fb057f9e159
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fb058227da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00000000003ff438 R11: 0000000000000246 R12: 0000000000011884
R13: 00007fb05822609c R14: 00000000000115bd R15: 00007fb058226090
 </TASK>