------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.5.1072/9407
WARNING: ./include/linux/ns_common.h:255 at put_cgroup_ns include/linux/cgroup_namespace.h:39 [inline], CPU#1: syz.5.1072/9407
WARNING: ./include/linux/ns_common.h:255 at free_nsproxy+0x484/0x560 kernel/nsproxy.c:198, CPU#1: syz.5.1072/9407
Modules linked in:
CPU: 1 UID: 0 PID: 9407 Comm: syz.5.1072 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_cgroup_ns include/linux/cgroup_namespace.h:39 [inline]
RIP: 0010:free_nsproxy+0x484/0x560 kernel/nsproxy.c:198
Code: 52 4b 33 00 90 0f 0b 90 e9 0c fe ff ff e8 44 4b 33 00 4c 89 ff be 03 00 00 00 e8 b7 f8 0a 03 e9 18 fe ff ff e8 2d 4b 33 00 90 <0f> 0b 90 e9 95 fe ff ff e8 1f 4b 33 00 4c 89 ff be 03 00 00 00 e8
RSP: 0018:ffffc90003887a90 EFLAGS: 00010293
RAX: ffffffff818e8373 RBX: ffff88807744fb60 RCX: ffff88801d751e80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff88806bd6e8bb R09: 1ffff1100d7add17
R10: dffffc0000000000 R11: ffffed100d7add18 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff88806bd6e800 R15: ffff88806bd6e8b8
FS:  0000000000000000(0000) GS:ffff888125b7c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa427b17d60 CR3: 000000000e136000 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: 0033:0x7fa426d8f6c9
Code: Unable to access opcode bytes at 0x7fa426d8f69f.
RSP: 002b:00007fa427caf0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fa426fe5fa8 RCX: 00007fa426d8f6c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fa426fe5fa8
RBP: 00007fa426fe5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa426fe6038 R14: 00007ffe0b33b770 R15: 00007ffe0b33b858
 </TASK>