------------[ cut here ]------------
WARNING: CPU: 0 PID: 9 at kernel/rcu/sync.c:177 rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
Modules linked in:
CPU: 0 UID: 0 PID: 9 Comm: kworker/0:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: events destroy_super_work
RIP: 0010:rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177
Code: 18 e8 87 c7 00 00 43 0f b6 44 25 00 84 c0 0f 85 82 00 00 00 83 3b 00 75 1f 5b 41 5c 41 5d 41 5e 41 5f 5d e9 05 6d a5 09 cc 90 <0f> 0b 90 e9 66 ff ff ff 90 0f 0b 90 eb 8a 90 0f 0b 90 eb db 89 d9
RSP: 0018:ffffc900001b79c8 EFLAGS: 00010246
RAX: 0000000000000002 RBX: ffff888000fd8350 RCX: 0c73a4abb7343300
RDX: 0000000000000000 RSI: ffffffff8bbf18c0 RDI: ffff888000fd8350
RBP: 0000000000000256 R08: ffffffff8dddf917 R09: 1ffffffff1bbbf22
R10: dffffc0000000000 R11: fffffbfff1bbbf23 R12: dffffc0000000000
R13: 1ffff110001fb06a R14: ffff888000fd8350 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffcd962be40 CR3: 000000004336d000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 percpu_free_rwsem+0x40/0x80 kernel/locking/percpu-rwsem.c:42
 destroy_super_work+0xee/0x130 fs/super.c:283
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>