linux-kernel - Re: [syzbot] WARNING in btrfs_space_info_update_bytes_may

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Message-ID: <Y1/SqIuP4tbszPAW@casper.infradead.org>
Date:   Mon, 31 Oct 2022 13:50:32 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     syzbot <syzbot+8edfa01e46fd9fe3fbfb@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, clm@...com, dsterba@...e.com,
        hch@....de, josef@...icpanda.com, linmiaohe@...wei.com,
        linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, torvalds@...ux-foundation.org
Subject: Re: [syzbot] WARNING in btrfs_space_info_update_bytes_may_use

Dmitry, I don't see a way to tell syzbot that its bisection has gone
astray.  Can you add one or document it if it already exists?

On Mon, Oct 31, 2022 at 04:51:22AM -0700, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 0c7c575df56b957390206deb018c41acbb412159
> Author: Matthew Wilcox (Oracle) <willy@...radead.org>
> Date:   Wed Feb 24 20:01:52 2021 +0000
> 
>     mm/filemap: remove dynamically allocated array from filemap_read

This change affects the read path.  The crash happens in the unmount
path.  The data structure that's being checked is modified in the write
path.  I just can't see how this commit is in any way related.

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=119e21b6880000
> start commit:   b229b6ca5abb Merge tag 'perf-tools-fixes-for-v6.1-2022-10-..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=139e21b6880000
> console output: https://syzkaller.appspot.com/x/log.txt?x=159e21b6880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
> dashboard link: https://syzkaller.appspot.com/bug?extid=8edfa01e46fd9fe3fbfb
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17db9ab1880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=124e21b6880000
> 
> Reported-by: syzbot+8edfa01e46fd9fe3fbfb@...kaller.appspotmail.com
> Fixes: 0c7c575df56b ("mm/filemap: remove dynamically allocated array from filemap_read")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection