------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz-executor/5820
WARNING: ./include/linux/ns_common.h:255 at put_mnt_ns+0x152/0x190 fs/namespace.c:6048, CPU#1: syz-executor/5820
Modules linked in:
CPU: 1 UID: 0 PID: 5820 Comm: syz-executor 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_mnt_ns+0x152/0x190 fs/namespace.c:6048
Code: 79 00 00 bf 01 00 00 00 89 ee e8 39 d9 7d ff 85 ed 7e 1f e8 f0 d4 7d ff 5b 41 5e 41 5f 5d e9 d5 a2 24 09 cc e8 df d4 7d ff 90 <0f> 0b 90 e9 33 ff ff ff e8 d1 d4 7d ff 4c 89 f7 be 03 00 00 00 5b
RSP: 0018:ffffc9000416fcc8 EFLAGS: 00010293
RAX: ffffffff8243fb51 RBX: ffff88807dfd6800 RCX: ffff888048f63d00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88807dfd68bb R09: 1ffff1100fbfad17
R10: dffffc0000000000 R11: ffffed100fbfad18 R12: dffffc0000000000
R13: 0000000000000100 R14: ffff88807dfd68b8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125b79000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd24427c08 CR3: 0000000063266000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_nsproxy+0x46/0x560 kernel/nsproxy.c:192
 do_exit+0x6b8/0x2300 kernel/exit.c:969
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1111
 __do_sys_exit_group kernel/exit.c:1122 [inline]
 __se_sys_exit_group kernel/exit.c:1120 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1120
 x64_sys_call+0x2210/0x2210 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdce278f6c9
Code: Unable to access opcode bytes at 0x7fdce278f69f.
RSP: 002b:00007fff44dcd368 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007fdce2811def RCX: 00007fdce278f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000016 R08: 00007fff44dcb106 R09: 00007fff44dce620
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff44dce620
R13: 00007fdce2811d7d R14: 000055558112a4a8 R15: 00007fff44dd07e0
 </TASK>