[syzbot] [lsm?] WARNING in put_cred_rcu

[Christian Brauner]

On Fri, Nov 07, 2025 at 06:05:27AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    17490bd0527f Add linux-next specific files for 20251104
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=16c09bcd980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=9995c0d2611ab121
> 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
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1500a532580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e0a114580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/a4d318147846/disk-17490bd0.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/86641a470170/vmlinux-17490bd0.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/35c008a540c8/bzImage-17490bd0.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+553c4078ab14e3cf3358 at syzkaller.appspotmail.com

#syz test: https://github.com/brauner/linux.git work.namespace-6.19.fixes