linux-kernel - Re: kernel BUG at fs/buffer.c:LINE!

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Message-ID: <20191219233056.GA81515@jaegeuk-macbookpro.roam.corp.google.com>
Date:   Thu, 19 Dec 2019 15:30:56 -0800
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Bart Van Assche <bvanassche@....org>
Cc:     axboe@...nel.dk, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: kernel BUG at fs/buffer.c:LINE!

On 12/18, Bart Van Assche wrote:
> On 2019-12-18 08:21, syzbot wrote:
> > syzbot has bisected this bug to:
> > 
> > commit 5db470e229e22b7eda6e23b5566e532c96fb5bc3
> > Author: Jaegeuk Kim <jaegeuk@...nel.org>
> > Date:   Thu Jan 10 03:17:14 2019 +0000
> > 
> >     loop: drop caches if offset or block_size are changed
> > 
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13f3ca8ee00000
> > start commit:   2187f215 Merge tag 'for-5.5-rc2-tag' of
> > git://git.kernel.o..
> > git tree:       upstream
> > final crash:    https://syzkaller.appspot.com/x/report.txt?x=100bca8ee00000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17f3ca8ee00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=dcf10bf83926432a
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=cfed5b56649bddf80d6e
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1171ba8ee00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=107440aee00000
> 
> Hi Jaegeuk,
> 
> Since syzbot has identified a reproducer I think that it's easy to test
> whether your new patch fixes what syzbot discovered. Have you already
> had the chance to test this?
> 

I can't reproduce it with C reproducer. Hmmm...

> Thanks,
> 
> Bart.