linux-kernel - Re: [syzbot] kernel BUG at fs/ext4/inline.c:LINE!

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Message-ID: <CACT4Y+aCFzhaTS-_D3qU_svaNbum2Rpc3k6Y9_UCb=vA8MOqiw@mail.gmail.com>
Date:   Tue, 30 Aug 2022 09:46:03 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     syzbot <syzbot+4faa160fa96bfba639f8@...kaller.appspotmail.com>,
        adilger.kernel@...ger.ca, hch@....de, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, paulmck@...nel.org,
        phil@...lpotter.co.uk, syzkaller-bugs@...glegroups.com,
        tytso@....edu
Subject: Re: [syzbot] kernel BUG at fs/ext4/inline.c:LINE!

On Mon, 29 Aug 2022 at 16:19, Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Mon, Aug 29, 2022 at 05:17:13AM -0700, syzbot wrote:
> > syzbot suspects this issue was fixed by commit:
> >
> > commit 1045a06724f322ed61f1ffb994427c7bdbe64647
> > Author: Christoph Hellwig <hch@....de>
> > Date:   Wed Jun 29 15:01:02 2022 +0000
> >
> >     remove CONFIG_ANDROID
> >
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16ab0893080000
> > start commit:   a8ad9a2434dc Merge tag 'efi-urgent-for-v5.16-2' of git://g..
> > git tree:       upstream
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=2ebd4b29568807bc
> > dashboard link: https://syzkaller.appspot.com/bug?extid=4faa160fa96bfba639f8
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=114ae045b00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1785e92bb00000
> >
> > If the result looks correct, please mark the issue as fixed by replying with:
> >
> > #syz fix: remove CONFIG_ANDROID
> >
> > For information about bisection process see: https://goo.gl/tpsmEJ#bisection
>
> I really doubt that ext4 has anything to do with the removal of
> CONFIG_ANDROID

Agree.

Looking at:
$ git log --oneline fs/ext4/inline.c

The following recent commit fixes a very similar failure mode:

#syz fix: ext4: fix bug_on in ext4_writepages