------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: syz.3.1172/9475
WARNING: ./include/linux/ns_common.h:255 at put_uts_ns include/linux/uts_namespace.h:37 [inline], CPU#0: syz.3.1172/9475
WARNING: ./include/linux/ns_common.h:255 at free_nsproxy+0x415/0x560 kernel/nsproxy.c:193, CPU#0: syz.3.1172/9475
Modules linked in:
CPU: 0 UID: 0 PID: 9475 Comm: syz.3.1172 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 b8 33 33 00 48 8b 3d 91 38 32 11 48 89 de 5b 41 5c 41 5e 41 5f 5d e9 81 34 8e 00 e8 9c 33 33 00 90 <0f> 0b 90 e9 ba fc ff ff e8 8e 33 33 00 4c 89 ff be 03 00 00 00 e8
RSP: 0018:ffffc90018fbfa90 EFLAGS: 00010293
RAX: ffffffff818e2be4 RBX: ffff88801d297478 RCX: ffff88802d22db80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88805fe6c52b R09: 1ffff1100bfcd8a5
R10: dffffc0000000000 R11: ffffed100bfcd8a6 R12: dffffc0000000000
R13: 0000000000000009 R14: ffff88805fe6c2d8 R15: ffff88805fe6c528
FS:  0000000000000000(0000) GS:ffff888125a82000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9689f909c0 CR3: 00000000642a8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 do_exit+0x6b8/0x2300 kernel/exit.c:969
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75