------------[ cut here ]------------
WARNING: ./include/linux/ns_common.h:311 at __ns_ref_active_put include/linux/ns_common.h:311 [inline], CPU#1: syz.1.813/8540
WARNING: ./include/linux/ns_common.h:311 at nsproxy_ns_active_put+0xa19/0xd30 fs/nsfs.c:707, CPU#1: syz.1.813/8540
Modules linked in:
CPU: 1 UID: 0 PID: 8540 Comm: syz.1.813 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 a4 ec 76 ff 90 0f 0b 90 e9 ab fc ff ff e8 96 ec 76 ff 90 0f 0b 90 e9 41 fd ff ff e8 88 ec 76 ff 90 <0f> 0b 90 e9 64 fd ff ff e8 7a ec 76 ff 90 0f 0b 90 e9 98 fd ff ff
RSP: 0018:ffffc90003eafd38 EFLAGS: 00010293

RAX: ffffffff824ae3a8 RBX: ffff88805dcf37b8 RCX: ffff88802b8dbd00
RDX: 0000000000000000 RSI: 00000000effffff8 RDI: 00000000effffff8
RBP: 00000000effffff8 R08: ffffffff8e36cbcb R09: 1ffffffff1c6d979
R10: dffffc0000000000 R11: fffffbfff1c6d97a R12: dffffc0000000000
R13: 1ffffffff1c6d965 R14: ffffffff8e36cb00 R15: ffffffff8e36cb28
FS:  00007f5a032776c0(0000) GS:ffff888125b79000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5a03234f98 CR3: 00000000788a8000 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