Re: [syzbot] [modules?] KASAN: invalid-access Read in init_module_from_file

[Aleksandr Nogikh]

On Tue, Aug 8, 2023 at 12:09 AM syzbot
<syzbot+e3705186451a87fd93b8@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 125bfc7cd750e68c99f1d446e2c22abea08c237f
> Author: Li Nan <linan122@xxxxxxxxxx>
> Date:   Fri Jun 9 09:43:20 2023 +0000
>
>     md/raid10: fix the condition to call bio_end_io_acct()
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15c26ba9a80000
> start commit:   a901a3568fd2 Merge tag 'iomap-6.5-merge-1' of git://git.ke..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f5e1158c5b2f83bb
> dashboard link: https://syzkaller.appspot.com/bug?extid=e3705186451a87fd93b8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12518548a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=124ccf70a80000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: md/raid10: fix the condition to call bio_end_io_acct()

No, that's unrelated.

Most likely it's due to https://github.com/google/syzkaller/issues/4117
TL;DR: for bugs that only existed for a very short time syzbot is
having problems differentiating between revisions where the bug is not
yet introduced and where it's already fixed.

>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>