------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: kworker/0:3/979
WARNING: ./include/linux/ns_common.h:255 at put_user_ns include/linux/user_namespace.h:189 [inline], CPU#0: kworker/0:3/979
WARNING: ./include/linux/ns_common.h:255 at destroy_super_work+0x15c/0x1a0 fs/super.c:280, CPU#0: kworker/0:3/979
Modules linked in:
CPU: 0 UID: 0 PID: 979 Comm: kworker/0:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events destroy_super_work
RIP: 0010:__ns_ref_put include/linux/ns_common.h:255 [inline]
RIP: 0010:put_user_ns include/linux/user_namespace.h:189 [inline]
RIP: 0010:destroy_super_work+0x15c/0x1a0 fs/super.c:280
Code: 7b 63 ff 48 81 c3 a8 fc ff ff 48 89 df e8 bc 7b 63 ff 4c 89 f7 5b 41 5c 41 5d 41 5e 41 5f 5d e9 6a 7c e1 ff e8 f5 e6 86 ff 90 <0f> 0b 90 e9 6d ff ff ff e8 e7 e6 86 ff 4c 89 e7 be 03 00 00 00 e8
RSP: 0018:ffffc90003857a48 EFLAGS: 00010293
RAX: ffffffff823a788b RBX: ffff88806b944898 RCX: ffff888026059e80
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000
RBP: 0000000000000004 R08: ffff88807f5e45bb R09: 1ffff1100febc8b7
R10: dffffc0000000000 R11: ffffed100febc8b8 R12: ffff88807f5e45b8
R13: dffffc0000000000 R14: ffff88806b944000 R15: ffff88807f5e4428
FS:  0000000000000000(0000) GS:ffff888125a82000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001000 CR3: 000000006462e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work+0x93a/0x15e0 kernel/workqueue.c:3261
 process_scheduled_works kernel/workqueue.c:3344 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>