------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: syz-executor/5828
WARNING: ./include/linux/ns_common.h:255 at put_mnt_ns+0x152/0x190 fs/namespace.c:6048, CPU#0: syz-executor/5828
Modules linked in:
CPU: 0 UID: 0 PID: 5828 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RSP: 0018:ffffc9000400fa68 EFLAGS: 00010293
RAX: ffffffff82433ba1 RBX: ffff88807ca89400 RCX: ffff88802b085b80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88807ca894bb R09: 1ffff1100f951297
R10: dffffc0000000000 R11: ffffed100f951298 R12: dffffc0000000000
R13: 0000000000000009 R14: ffff88807ca894b8 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125a8b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb2985b3ad8 CR3: 000000007fbc6000 CR4: 00000000003526f0
DR0: fffffffffffffff1 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 free_nsproxy+0x46/0x560 kernel/nsproxy.c:192
 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: 0033:0x7f555bd9140a
Code: Unable to access opcode bytes at 0x7f555bd913e0.
RSP: 002b:00007ffffa342748 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: 0000000000000000 RBX: 00007ffffa3427d0 RCX: 00007f555bd9140a
RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007ffffa34276c R09: 0079746972756365
R10: 00007ffffa3427d0 R11: 0000000000000212 R12: 00007f555bfb47a0
R13: 00007ffffa34276c R14: 0000000000000000 R15: 00007f555bfb4e60
 </TASK>