------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.5.2208/17196
WARNING: ./include/linux/ns_common.h:255 at put_uts_ns include/linux/uts_namespace.h:37 [inline], CPU#1: syz.5.2208/17196
WARNING: ./include/linux/ns_common.h:255 at free_nsproxy+0x415/0x560 kernel/nsproxy.c:193, CPU#1: syz.5.2208/17196
Modules linked in:
CPU: 1 UID: 0 PID: 17196 Comm: syz.5.2208 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__ns_ref_put include/linux/ns_common.h:255 [inline]
RIP: 0010:put_uts_ns include/linux/uts_namespace.h:37 [inline]
RIP: 0010:free_nsproxy+0x415/0x560 kernel/nsproxy.c:193
Code: 85 ed 0f 8e be 00 00 00 e8 a8 31 33 00 48 8b 3d f1 28 32 11 48 89 de 5b 41 5c 41 5e 41 5f 5d e9 01 32 8e 00 e8 8c 31 33 00 90 <0f> 0b 90 e9 ba fc ff ff e8 7e 31 33 00 4c 89 ff be 03 00 00 00 e8
RSP: 0018:ffffc90003d0fa90 EFLAGS: 00010293

RAX: ffffffff818e2b84 RBX: ffff88801d2af7b8 RCX: ffff888032558000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff888024a8963b R09: 1ffff110049512c7
R10: dffffc0000000000 R11: ffffed10049512c8 R12: dffffc0000000000
R13: 0000000000000009 R14: ffff888024a893e8 R15: ffff888024a89638
FS:  0000000000000000(0000) GS:ffff888125b83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc3c81e5f40 CR3: 000000007674e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_exit+0x6b8/0x2300 kernel/exit.c:969
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111