------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:311 at __ns_ref_active_put include/linux/ns_common.h:311 [inline], CPU#0: syz.5.2194/13477
WARNING: ./include/linux/ns_common.h:311 at nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707, CPU#0: syz.5.2194/13477
Modules linked in:
CPU: 0 UID: 255 PID: 13477 Comm: syz.5.2194 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 44 33 77 ff 90 0f 0b 90 e9 ab fc ff ff e8 36 33 77 ff 90 0f 0b 90 e9 41 fd ff ff e8 28 33 77 ff 90 <0f> 0b 90 e9 64 fd ff ff e8 1a 33 77 ff 90 0f 0b 90 e9 98 fd ff ff
RSP: 0018:ffffc9000516fd38 EFLAGS: 00010293
RAX: ffffffff824a29e8 RBX: ffff888050465f70 RCX: ffff88804efb9e80
RDX: 0000000000000000 RSI: 00000000effffff8 RDI: 00000000effffff8
RBP: 00000000effffff8 R08: ffffffff8e36ed0b R09: 1ffffffff1c6dda1
R10: dffffc0000000000 R11: fffffbfff1c6dda2 R12: dffffc0000000000
R13: 1ffffffff1c6dd8d R14: ffffffff8e36ec40 R15: ffffffff8e36ec68
FS:  00007f429160b6c0(0000) GS:ffff888125a83000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde03bcff70 CR3: 0000000074ebc000 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: 0033:0x7f429078f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f429160b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000134
RAX: ffffffffffffffda RBX: 00007f42909e5fa0 RCX: 00007f429078f6c9
RDX: 0000000000000000 RSI: 0000000024020000 RDI: 0000000000000006
RBP: 00007f4290811f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42909e6038 R14: 00007f42909e5fa0 R15: 00007fff47e5ae28
 </TASK>