linux-kernel - Re: [syzbot] linux-next test error: KASAN: null-ptr-deref Read in fuse_conn

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Message-ID: <CACT4Y+ZmFyDOg0=gXv5G8mdqhz5gwcwA9jOVuWgLi2CiYQBzYQ@mail.gmail.com>
Date:   Fri, 17 Sep 2021 10:05:13 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Miklos Szeredi <miklos@...redi.hu>
Cc:     Marco Elver <elver@...gle.com>,
        syzbot <syzbot+b304e8cb713be5f9d4e1@...kaller.appspotmail.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] linux-next test error: KASAN: null-ptr-deref Read in fuse_conn_put

On Mon, 6 Sept 2021 at 19:35, Miklos Szeredi <miklos@...redi.hu> wrote:
> > On Mon, 6 Sept 2021 at 13:56, Miklos Szeredi <miklos@...redi.hu> wrote:
> > > Thanks,
> > >
> > > Force pushed fixed commit 660585b56e63 ("fuse: wait for writepages in
> > > syncfs") to fuse.git#for-next.
> > >
> > > This is fixed as far as I'm concerned, not sure how to tell that to syzbot.
> >
> > Thanks -- we can let syzbot know:
> >
> > #syz fix: fuse: wait for writepages in syncfs
> >
> > (The syntax is just "#syz fix: <commit title>".)
>
> Yeah, but that patch has several versions, one of which is broken.
> Syzbot can't tell the difference just based on the title.

Hi Miklos,

For such cases it's useful to include Tested-by: tag into the commit
version that fixes the bug:
http://bit.do/syzbot#amend