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

["Vlastimil Babka (SUSE)" <vbabka@kernel.org>]

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@syzkaller.appspotmail.com
>> Tested-by: syzbot+c6879dc677a017f0a21b@syzkaller.appspotmail.com
> 
> 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.

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.

> 
>>
>> 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