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

[Lorenzo Stoakes (ARM)]

On Tue, Sep 08, 2026 at 11:32:18AM +0200, Vlastimil Babka (SUSE) wrote:
> On 9/8/26 11:25, Lorenzo Stoakes (ARM) wrote:
> > On Mon, Sep 07, 2026 at 09:15:02PM -0700, syzbot wrote:
> >> Hello,
> >>
> >> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
> >>
> >> Reported-by: syzbot+c6879dc677a017f0a21b@xxxxxxxxxxxxxxxxxxxxxxxxx
> >> Tested-by: syzbot+c6879dc677a017f0a21b@xxxxxxxxxxxxxxxxxxxxxxxxx
> >
> > Yup there we are :)
> >
> > Why is this constantly duplicating I wonder...
>
> Going back to the first mail:
>
> syzbot found the following issue on:
>
> HEAD commit:    5445d6419962 arm64: Don't read GMID_EL1 when MTE is disabled
> git tree:
> git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
>
> We can see it's based from 7.3-rc1:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-kernelci
>
> And since the problem was introduced there, all kinds of development trees
> for 7.4 (or even pending hotfixes for 7.3) based on 7.3-rc1 will now have it.

Yeah but I marked this #syz dupe? I guess that's cleared maybe for a new job?

>
> I guess syzbot has to learn to recognize it's a known problem and ignore it,
> or have some repo of known important fixes merged after rc1 it applies on
> top of such development trees, as they generaly won't be rebased to later rcs.

Yeah, be nice if 'hey check this upstream commit does it fix it?' *syzbot
confirms yes* could -> mark reports redundant.

But maybe harder to actually do than that?

>
> >
> >>
> >> Tested on:
> >>
> >> commit:         35b0fb39 mm/mremap: reset unfaulted VMA page offset fo..
> >> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >> console output: https://syzkaller.appspot.com/x/log.txt?x=15e13af9580000
> >> kernel config:  https://syzkaller.appspot.com/x/.config?x=56ed23170c168d4c
> >> dashboard link: https://syzkaller.appspot.com/bug?extid=c6879dc677a017f0a21b
> >> compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
> >> userspace arch: arm64
> >>
> >> Note: no patches were applied.
> >> Note: testing is done by a robot and is best-effort only.
> >
> > --
> > Cheers, Lorenzo
>

--
Cheers, Lorenzo