------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:255 at __ns_ref_put include/linux/ns_common.h:255 [inline], CPU#1: syz.0.2489/13065
WARNING: ./include/linux/ns_common.h:255 at put_cgroup_ns include/linux/cgroup_namespace.h:39 [inline], CPU#1: syz.0.2489/13065
WARNING: ./include/linux/ns_common.h:255 at free_nsproxy+0x484/0x560 kernel/nsproxy.c:198, CPU#1: syz.0.2489/13065
Modules linked in:
CPU: 1 UID: 0 PID: 13065 Comm: syz.0.2489 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:ffffc9000fc4fa90 EFLAGS: 00010293
RAX: ffffffff818e8373 RBX: ffff88801d29a270 RCX: ffff88802b721e80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: 00000000ffffffff R08: ffff888028fbeebb R09: 1ffff110051f7dd7
R10: dffffc0000000000 R11: ffffed10051f7dd8 R12: dffffc0000000000
R13: 0000000000000009 R14: ffff888028fbee00 R15: ffff888028fbeeb8
FS:  0000000000000000(0000) GS:ffff888125b7c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe6bf9b2d58 CR3: 0000000028c20000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004144
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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: 00fb:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:0000000000000000 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: cf9d780a350b4549 R09: c7e58b697db8ef3d
R10: d68d02d45a22dc24 R11: 19b4d49ef33da9ed R12: 39cb75b6fa6cb3d1
R13: a8d7b5dbf29d588f R14: 9b8908dcbb4f02b4 R15: 107b9d1451766018
 </TASK>