------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#0: syz.4.74/6429
WARNING: ./include/linux/ns_common.h:255 at put_uts_ns include/linux/uts_namespace.h:37 [inline], CPU#0: syz.4.74/6429
WARNING: ./include/linux/ns_common.h:255 at free_nsproxy+0x415/0x560 kernel/nsproxy.c:193, CPU#0: syz.4.74/6429
Modules linked in:
CPU: 0 UID: 60928 PID: 6429 Comm: syz.4.74 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_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 48 4d 33 00 48 8b 3d 71 31 ee 10 48 89 de 5b 41 5c 41 5e 41 5f 5d e9 d1 cb 8e 00 e8 2c 4d 33 00 90 <0f> 0b 90 e9 ba fc ff ff e8 1e 4d 33 00 4c 89 ff be 03 00 00 00 e8
RSP: 0018:ffffc9000b4f7a90 EFLAGS: 00010293
RAX: ffffffff818e3304 RBX: ffff88801c6db5b0 RCX: ffff888027145b80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88805abc8adb R09: 1ffff1100b57915b
R10: dffffc0000000000 R11: ffffed100b57915c R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88805abc8888 R15: ffff88805abc8ad8
FS:  0000000000000000(0000) GS:ffff888125ec2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555591fe97d0 CR3: 000000000dd36000 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
 __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: 0033:0x7f32acf8f6c9
Code: Unable to access opcode bytes at 0x7f32acf8f69f.
RSP: 002b:00007f32ade0f0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f32ad1e5fa8 RCX: 00007f32acf8f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f32ad1e5fa8
RBP: 00007f32ad1e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f32ad1e6038 R14: 00007ffd3d6f2ab0 R15: 00007ffd3d6f2b98
 </TASK>