------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: syz-executor/5819
WARNING: ./include/linux/ns_common.h:255 at put_mnt_ns+0x152/0x190 fs/namespace.c:6048, CPU#0: syz-executor/5819
Modules linked in:
CPU: 0 UID: 0 PID: 5819 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 99 15 7e ff 85 ed 7e 1f e8 50 11 7e ff 5b 41 5e 41 5f 5d c3 cc cc cc cc cc e8 3f 11 7e ff 90 <0f> 0b 90 e9 33 ff ff ff e8 31 11 7e ff 4c 89 f7 be 03 00 00 00 5b
RSP: 0018:ffffc9000400fcc8 EFLAGS: 00010293
RAX: ffffffff82434e41 RBX: ffff88801ff78c00 RCX: ffff88802f870000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88801ff78cbb R09: 1ffff11003fef197
R10: dffffc0000000000 R11: ffffed1003fef198 R12: dffffc0000000000
R13: 0000000000004300 R14: ffff88801ff78cb8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125a82000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1937b17d60 CR3: 000000000e138000 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: 0033:0x7f1936d8f6c9
Code: Unable to access opcode bytes at 0x7f1936d8f69f.
RSP: 002b:00007ffc5bd83178 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1936d8f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000043
RBP: 00007f1936e13619 R08: 00007ffc5bd80f16 R09: 00000000000927c0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000020
R13: 00000000000927c0 R14: 0000000000031312 R15: 00007ffc5bd83330
 </TASK>