Re: [syzbot] [fs?] WARNING in copy_mnt_ns

[syzbot]

syzbot has bisected this issue to:

commit be5f21d3985f00827e09b798f7a07ebd6dd7f54a
Author: Christian Brauner <brauner@xxxxxxxxxx>
Date:   Wed Sep 17 10:28:08 2025 +0000

    ns: add ns_common_free()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=135eeee2580000
start commit:   50c19e20ed2e Merge tag 'nolibc-20250928-for-6.18-1' of git..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=10deeee2580000
console output: https://syzkaller.appspot.com/x/log.txt?x=175eeee2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8f1ac8502efee0ee
dashboard link: https://syzkaller.appspot.com/bug?extid=e0f8855a87443d6a2413
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1374b858580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15602092580000

Reported-by: syzbot+e0f8855a87443d6a2413@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: be5f21d3985f ("ns: add ns_common_free()")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection