linux-kernel - Re: KMSAN: uninit-value in ip_tunnel

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Message-ID: <CAG_fn=XnFw0756BNQSVXUwCh7-JjzTgfp6jCvut41++PSJ9oeA@mail.gmail.com>
Date:   Thu, 7 Dec 2023 15:27:10 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     xingwei lee <xrivendell7@...il.com>
Cc:     davem@...emloft.net, dsahern@...nel.org,
        Eric Dumazet <edumazet@...gle.com>, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller@...glegroups.com,
        syzbot+4a2c52677a8a1aa283cb@...kaller.appspotmail.com
Subject: Re: KMSAN: uninit-value in ip_tunnel_xmit

On Thu, Dec 7, 2023 at 2:28 PM xingwei lee <xrivendell7@...il.com> wrote:
>
> Hello,
>
> When fuzzing the latest upstream linux 6.7-rc4,  the following crash
> was triggered.
> HEAD commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8
>
> If you fix this issue, please add the following tag to the commit:
> Reported-by: xingwei Lee <xrivendell7@...il.com>
>
> console_log: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-console_log
> report: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-report
> kernel commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8
> kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=ce27066613dacbb6
> repro.c: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-repro-c
> repro.txt: https://gist.github.com/xrivendell7/b41fbc928cd203823783fd90c98b6583#file-repro-txt
>
> In the lasted kernel: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 the
> [  199.471467][ T8590] =====================================================
> [  199.475015][ T8590] BUG: KMSAN: uninit-value in ip_tunnel_xmit+0x857/0x3e80
> [  199.478180][ T8590]  ip_tunnel_xmit+0x857/0x3e80

In the future, please consider symbolizing your reports using
syz-symbolize before sending them upstream.