linux-kernel - Re: KASAN: null-ptr-deref Write in start

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Message-ID: <CACT4Y+YJCMyTDrUFWXEnZ-raQMos0+1F1O8k5eX998pqNUWKSw@mail.gmail.com>
Date:   Fri, 8 Jan 2021 10:17:25 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+6700bca07dff187809c4@...kaller.appspotmail.com>
Cc:     syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-btrfs@...r.kernel.org
Subject: Re: KASAN: null-ptr-deref Write in start_transaction

On Thu, Jan 7, 2021 at 2:11 PM syzbot
<syzbot+6700bca07dff187809c4@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit f30bed83426c5cb9fce6cabb3f7cc5a9d5428fcc
> Author: Filipe Manana <fdmanana@...e.com>
> Date:   Fri Nov 13 11:24:17 2020 +0000
>
>     btrfs: remove unnecessary attempt to drop extent maps after adding inline extent
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13ddc30b500000
> start commit:   521b619a Merge tag 'linux-kselftest-kunit-fixes-5.10-rc3' ..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61033507391c77ff
> dashboard link: https://syzkaller.appspot.com/bug?extid=6700bca07dff187809c4
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14a07ab2500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10fe69c6500000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: btrfs: remove unnecessary attempt to drop extent maps after adding inline extent
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

#syz fix: btrfs: remove unnecessary attempt to drop extent maps after
adding inline extent