Re: [syzbot] [mm?] WARNING in move_page_tables

[Harry Yoo]

On Tue, Aug 12, 2025 at 10:08:02PM -0700, syzbot wrote:
> Hello,
> 
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> 
> Reported-by: syzbot+4d9a13f0797c46a29e42@xxxxxxxxxxxxxxxxxxxxxxxxx
> Tested-by: syzbot+4d9a13f0797c46a29e42@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> Tested on:
> 
> commit:         0db9b72d mm/userfaultfd: fix kmap_local LIFO ordering ..
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-hotfixes-unstable
> console output: https://syzkaller.appspot.com/x/log.txt?x=128fb5a2580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2323b2d6038203a5
> dashboard link: https://syzkaller.appspot.com/bug?extid=4d9a13f0797c46a29e42
> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> 
> Note: no patches were applied.
> Note: testing is done by a robot and is best-effort only.

This looks spurious. I was able to reproduce it with the reproducer on
the same commit (the latest mm-hotfixes-unstable).

-- 
Cheers,
Harry / Hyeonggon