Re: [syzbot] [overlayfs?] WARNING in shmem_unlink

[syzbot]

Hello,

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

Reported-by: syzbot+ec9fab8b7f0386b98a17@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+ec9fab8b7f0386b98a17@xxxxxxxxxxxxxxxxxxxxxxxxx

Tested on:

commit:         5dfcd103 ovl: adapt ovl_parent_lock() to casefolded di..
git tree:       https://github.com/amir73il/linux ovl_casefold
console output: https://syzkaller.appspot.com/x/log.txt?x=1040fc62580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e1e1566c7726877e
dashboard link: https://syzkaller.appspot.com/bug?extid=ec9fab8b7f0386b98a17
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7

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