------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:311 at __ns_ref_active_put include/linux/ns_common.h:311 [inline], CPU#1: syz.0.20/6018
WARNING: ./include/linux/ns_common.h:311 at nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707, CPU#1: syz.0.20/6018
Modules linked in:
CPU: 1 UID: 0 PID: 6018 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
RIP: 0010:__ns_ref_active_put include/linux/ns_common.h:311 [inline]
RIP: 0010:nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707
Code: 0f 0b 90 e9 71 fc ff ff e8 04 7e 77 ff 90 0f 0b 90 e9 ab fc ff ff e8 f6 7d 77 ff 90 0f 0b 90 e9 41 fd ff ff e8 e8 7d 77 ff 90 <0f> 0b 90 e9 64 fd ff ff e8 da 7d 77 ff 90 0f 0b 90 e9 98 fd ff ff
RSP: 0018:ffffc900035c7d38 EFLAGS: 00010293
RAX: ffffffff8249dea8 RBX: ffff888028143a90 RCX: ffff8880765a1e80
RDX: 0000000000000000 RSI: 00000000effffff8 RDI: 00000000effffff8
RBP: 00000000effffff8 R08: ffffffff8e36c98b R09: 1ffffffff1c6d931
R10: dffffc0000000000 R11: fffffbfff1c6d932 R12: dffffc0000000000
R13: 1ffffffff1c6d91d R14: ffffffff8e36c8c0 R15: ffffffff8e36c8e8
FS:  000055555dd28500(0000) GS:ffff888125b92000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30163fff CR3: 0000000074940000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_nsproxy+0x26/0x560 kernel/nsproxy.c:190
 put_nsset kernel/nsproxy.c:341 [inline]
 __do_sys_setns kernel/nsproxy.c:594 [inline]
 __se_sys_setns+0x1268/0x17d0 kernel/nsproxy.c:559
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffafcd90ef7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 34 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd5cc81aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000134
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ffafcd90ef7
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000000c9
RBP: 00007ffafce11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffafcfe5fa0 R14: 00007ffafcfe5fa0 R15: 0000000000000003
 </TASK>