------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz-executor/6028
WARNING: ./include/linux/ns_common.h:255 at put_mnt_ns+0x152/0x190 fs/namespace.c:6048, CPU#1: syz-executor/6028
Modules linked in:
CPU: 1 UID: 0 PID: 6028 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:ffffc9000438fa68 EFLAGS: 00010293
RAX: ffffffff82434e41 RBX: ffff888065900c00 RCX: ffff88802c02db80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff888065900cbb R09: 1ffff1100cb20197
R10: dffffc0000000000 R11: ffffed100cb20198 R12: dffffc0000000000
R13: 0000000000000009 R14: ffff888065900cb8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125b82000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3909690020 CR3: 000000007ca66000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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
 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
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e9/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5b9098f2cb
Code: Unable to access opcode bytes at 0x7f5b9098f2a1.
RSP: 002b:00007fffa0c2bc30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffe7 RBX: 0000000000006cc0 RCX: 00007f5b9098f2cb
RDX: 00007fffa0c2bca8 RSI: 0000000040086602 RDI: 0000000000000005
RBP: 00007fffa0c2bd40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffa0c2cdd0
R13: 00007f5b90a11d7d R14: 000055558ef6a4a8 R15: 0000000000000005
 </TASK>