linux-kernel - Re: [f2fs-dev] [syzbot] BUG: unable to handle kernel NULL pointer dereference in f2fs_stop_discard

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Date:   Fri, 28 Oct 2022 11:49:19 +0800
From:   Chao Yu <chao@...nel.org>
To:     syzbot <syzbot+035a381ea1afb63f098d@...kaller.appspotmail.com>,
        changfengnan@...o.com, frank.li@...o.com, jaegeuk@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        wuhoipok@...il.com
Subject: Re: [f2fs-dev] [syzbot] BUG: unable to handle kernel NULL pointer
 dereference in f2fs_stop_discard_thread

Hello,

Thanks for the report, the bug has been fixed w/ below patch:

https://lore.kernel.org/linux-f2fs-devel/20221021023422.3101585-1-chao@kernel.org/T/#u

On 2022/10/28 11:34, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit 4d67490498acb4ffcef5ba7bc44990d46e66a44c
> Author: Fengnan Chang <changfengnan@...o.com>
> Date:   Thu Aug 19 08:02:37 2021 +0000
> 
>      f2fs: Don't create discard thread when device doesn't support realtime discard
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=17da7522880000
> start commit:   247f34f7b803 Linux 6.1-rc2
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=143a7522880000
> console output: https://syzkaller.appspot.com/x/log.txt?x=103a7522880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
> dashboard link: https://syzkaller.appspot.com/bug?extid=035a381ea1afb63f098d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11d92d6a880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12e5dbba880000
> 
> Reported-by: syzbot+035a381ea1afb63f098d@...kaller.appspotmail.com
> Fixes: 4d67490498ac ("f2fs: Don't create discard thread when device doesn't support realtime discard")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 
> 
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