linux-kernel - Re: [syzbot] [modules?] KASAN: invalid-access Read in init_module_from

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Date:   Tue, 8 Aug 2023 18:06:20 +0200
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     syzbot <syzbot+e3705186451a87fd93b8@...kaller.appspotmail.com>
Cc:     bpf@...r.kernel.org, chris@...isdown.name, linan122@...wei.com,
        linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
        llvm@...ts.linux.dev, mcgrof@...nel.org, nathan@...nel.org,
        ndesaulniers@...gle.com, song@...nel.org,
        syzkaller-bugs@...glegroups.com, trix@...hat.com
Subject: Re: [syzbot] [modules?] KASAN: invalid-access Read in init_module_from_file

On Tue, Aug 8, 2023 at 12:09 AM syzbot
<syzbot+e3705186451a87fd93b8@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 125bfc7cd750e68c99f1d446e2c22abea08c237f
> Author: Li Nan <linan122@...wei.com>
> 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
>