------------[ cut here ]------------
WARNING: fs/namespace.c:1375 at cleanup_mnt+0x33f/0x430, CPU#0: syz-executor.6/289
Modules linked in:
CPU: 0 UID: 0 PID: 289 Comm: syz-executor.6 Tainted: G        W           6.17.0-rc4-next-20250901 #1 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:cleanup_mnt+0x33f/0x430
Code: c7 20 49 d1 85 e8 41 b3 fa 02 49 8d 7d 40 5b 48 c7 c6 d0 fa be 81 5d 41 5c 41 5d 41 5e 41 5f e9 97 9a 9c ff e8 f2 3c b4 ff 90 <0f> 0b 90 e9 e6 fc ff ff e8 e4 3c b4 ff 4c 89 ef e8 6c d7 06 00 e9
RSP: 0018:ffff88801bdb7e20 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff81bfb6a5
RDX: ffff8880162d9b80 RSI: ffffffff81bfb9be RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880162da458
R13: ffff888013ad1500 R14: 0000000000000001 R15: ffff888013ad1540
FS:  000055559062c400(0000) GS:ffff8880e55d8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffedef0afd8 CR3: 0000000043206000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 task_work_run+0x172/0x280
 exit_to_user_mode_loop+0xef/0x110
 do_syscall_64+0x2f7/0x360
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c8f024f87
Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffedef0b238 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7c8f024f87
RDX: 00007ffedef0b30a RSI: 000000000000000a RDI: 00007ffedef0b300
RBP: 00007ffedef0b300 R08: 00000000ffffffff R09: 00007ffedef0b0d0
R10: 000055559062dd13 R11: 0000000000000246 R12: 00007f7c8f07d105
R13: 00007ffedef0c3c0 R14: 000055559062dc20 R15: 00007ffedef0c400
 </TASK>
irq event stamp: 219347
hardirqs last  enabled at (219357): [<ffffffff81541b18>] __up_console_sem+0x78/0x80
hardirqs last disabled at (219364): [<ffffffff81541afd>] __up_console_sem+0x5d/0x80
softirqs last  enabled at (219276): [<ffffffff813bafcc>] handle_softirqs+0x50c/0x770
softirqs last disabled at (219261): [<ffffffff813bb364>] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
unregister_netdevice: waiting for vcan0 to become free. Usage count = 0