[syzbot] [fs?] WARNING in destroy_super_work

[Christian Brauner]

On Thu, Nov 06, 2025 at 11:31:27PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    982312090977 Add linux-next specific files for 20251103
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=17b2932f980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=43cc0e31558cb527
> dashboard link: https://syzkaller.appspot.com/bug?extid=1957b26299cf3ff7890c
> 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=1347817c580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/40058f8a830c/disk-98231209.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/1d7f42e8639f/vmlinux-98231209.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/d8bb0284f393/bzImage-98231209.xz
> 
> The issue was bisected to:
> 
> commit 3c9820d5c64aeaadea7ffe3a6bb99d019a5ff46a
> Author: Christian Brauner <brauner at kernel.org>
> Date:   Wed Oct 29 12:20:24 2025 +0000
> 
>     ns: add active reference count
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101e9bcd980000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=121e9bcd980000
> console output: https://syzkaller.appspot.com/x/log.txt?x=141e9bcd980000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+1957b26299cf3ff7890c at syzkaller.appspotmail.com
> Fixes: 3c9820d5c64a ("ns: add active reference count")

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