netdev - Re: [syzbot] general protection fault in inet_csk

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Message-ID: <d94b3f8903fe743583cbee16ac60528bd77b1be6.camel@redhat.com>
Date:   Fri, 10 Dec 2021 15:37:54 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     Eric Dumazet <edumazet@...gle.com>,
        syzbot <syzbot+e4d843bb96a9431e6331@...kaller.appspotmail.com>,
        Florian Westphal <fw@...len.de>
Cc:     davem@...emloft.net, dsahern@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: Re: [syzbot] general protection fault in inet_csk_accept

On Fri, 2021-12-10 at 03:13 -0800, Eric Dumazet wrote:
> On Fri, Dec 10, 2021 at 3:09 AM syzbot
> <syzbot+e4d843bb96a9431e6331@...kaller.appspotmail.com> wrote:
> > 
> > Hello,
> > 
> > syzbot found the following issue on:
> > 
> > HEAD commit:    2a987e65025e Merge tag 'perf-tools-fixes-for-v5.16-2021-12..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=166f73adb00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=221ffc09e39ebbd1
> > dashboard link: https://syzkaller.appspot.com/bug?extid=e4d843bb96a9431e6331
> > compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16280ae5b00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1000fdc5b00000
> > 
> > The issue was bisected to:
> > 
> 
> Note to MPTCP maintainers, I think this issue is MPTCP one, 

Indeed it is, thanks for the head-up!

> and the bisection result shown here seems not relevant.

yep.

> The C repro is however correct, I trigger an immediate crash.

The repro is not triggering here - but I'm using a different kconfig.
Still the repro itself gives a good hint on the root cause. I'm testing
a patch with syzbot.

Thanks!

Paolo