[syzbot] [lsm?] WARNING in put_cred_rcu

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-by: syzbot+553c4078ab14e3cf3358 at syzkaller.appspotmail.com
Tested-by: syzbot+553c4078ab14e3cf3358 at syzkaller.appspotmail.com

Tested on:

commit:         80156be0 ns: fixes for namespace iteration and active ..
git tree:       https://github.com/brauner/linux.git work.namespace-6.19.fixes
console output: https://syzkaller.appspot.com/x/log.txt?x=17fc5412580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e31f5f45f87b6763
dashboard link: https://syzkaller.appspot.com/bug?extid=553c4078ab14e3cf3358
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.