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

[Bart Van Assche]

On 2019-12-18 08:21, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 5db470e229e22b7eda6e23b5566e532c96fb5bc3
> Author: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
> Date:ÂÂ Thu Jan 10 03:17:14 2019 +0000
> 
> ÂÂÂ loop: drop caches if offset or block_size are changed
> 
> bisection log:Â https://syzkaller.appspot.com/x/bisect.txt?x=13f3ca8ee00000
> start commit:ÂÂ 2187f215 Merge tag 'for-5.5-rc2-tag' of
> git://git.kernel.o..
> git tree:ÂÂÂÂÂÂ upstream
> final crash:ÂÂÂ https://syzkaller.appspot.com/x/report.txt?x=100bca8ee00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=17f3ca8ee00000
> kernel config:Â https://syzkaller.appspot.com/x/.config?x=dcf10bf83926432a
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=cfed5b56649bddf80d6e
> syz repro:ÂÂÂÂÂ https://syzkaller.appspot.com/x/repro.syz?x=1171ba8ee00000
> C reproducer:ÂÂ 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?

Thanks,

Bart.