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

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Message-ID: <20210108143508.GZ6430@twin.jikos.cz>
Date:   Fri, 8 Jan 2021 15:35:08 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Filipe Manana <fdmanana@...il.com>
Cc:     syzbot <syzbot+6700bca07dff187809c4@...kaller.appspotmail.com>,
        Chris Mason <clm@...com>, David Sterba <dsterba@...e.com>,
        Filipe David Borba Manana <fdmanana@...e.com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        mingo@...nel.org, mingo@...hat.com, peterz@...radead.org,
        rostedt@...dmis.org, syzkaller-bugs@...glegroups.com,
        will@...nel.org
Subject: Re: KASAN: null-ptr-deref Write in start_transaction

On Fri, Jan 08, 2021 at 02:22:00PM +0000, Filipe Manana wrote:
> On Thu, Jan 7, 2021 at 1:13 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
> 
> Nop, it can't be this change.
> 
> What should fix it should be the following commit:
> 
> commit ecfdc08b8cc65d737eebc26a1ee1875a097fd6a0
> Author: Goldwyn Rodrigues <rgoldwyn@...e.com>
> Date:   Thu Sep 24 11:39:21 2020 -0500
> 
>     btrfs: remove dio iomap DSYNC workaround

#syz fix: btrfs: remove dio iomap DSYNC workaround