Re: [syzbot] [ide?] UBSAN: shift-out-of-bounds in ata_qc_issue

[Niklas Cassel]

Hello syzkaller folks,

We syzkaller seems to have found a bug that it can reproduce very easily.

Looking at the dashboard for this bug:
https://syzkaller.appspot.com/bug?extid=1f77b8ca15336fff21ff

It has so far been reproduced 4 times in 3 days.

However, there is no reproducer yet.

Any advice on how we can try to trigger this without an exact reproducer
available yet?


Kind regards,
Niklas


On Tue, Feb 17, 2026 at 12:55:35PM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ca4ee40bf13d Partly revert "drm/hyperv: Remove reference t..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13c6c722580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a771bfd268751cd6
> dashboard link: https://syzkaller.appspot.com/bug?extid=1f77b8ca15336fff21ff
> compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
> 
> Unfortunately, I don't have any reproducer for this issue yet.