------------[ cut here ]------------ WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: kworker/0:2/794 WARNING: ./include/linux/ns_common.h:255 at put_user_ns include/linux/user_namespace.h:189 [inline], CPU#0: kworker/0:2/794 WARNING: ./include/linux/ns_common.h:255 at destroy_super_work+0x15c/0x1a0 fs/super.c:280, CPU#0: kworker/0:2/794 Modules linked in: CPU: 0 UID: 0 PID: 794 Comm: kworker/0:2 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: 7e 63 ff 48 81 c3 a8 fc ff ff 48 89 df e8 7c 7e 63 ff 4c 89 f7 5b 41 5c 41 5d 41 5e 41 5f 5d e9 4a 7d e1 ff e8 45 e8 86 ff 90 <0f> 0b 90 e9 6d ff ff ff e8 37 e8 86 ff 4c 89 e7 be 03 00 00 00 e8 RSP: 0018:ffffc900033c7a48 EFLAGS: 00010293 RAX: ffffffff823a74cb RBX: ffff88807a606898 RCX: ffff888024de5b80 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 RBP: 0000000000000004 R08: ffff888057774193 R09: 1ffff1100aeee832 R10: dffffc0000000000 R11: ffffed100aeee833 R12: ffff888057774190 R13: dffffc0000000000 R14: ffff88807a606000 R15: ffff888057774000 FS: 0000000000000000(0000) GS:ffff888125a83000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe71bdd9bc CR3: 000000000e138000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000009951 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: process_one_work+0x94a/0x15d0 kernel/workqueue.c:3267 process_scheduled_works kernel/workqueue.c:3350 [inline] worker_thread+0x9b0/0xee0 kernel/workqueue.c:3431 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