linux-kernel - AW: AW: AW: PROBLEM: Kernel Oops in UDP stack

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Date:   Thu, 2 Aug 2018 11:02:39 +0000
From:   Marcel Hellwig <mhellwig@...-group.com>
To:     'Eric Dumazet' <eric.dumazet@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        "'davem@...emloft.net'" <davem@...emloft.net>,
        "'kuznet@....inr.ac.ru'" <kuznet@....inr.ac.ru>,
        "'yoshfuji@...ux-ipv6.org'" <yoshfuji@...ux-ipv6.org>,
        "'andrew@...n.ch'" <andrew@...n.ch>
CC:     "'netdev@...r.kernel.org'" <netdev@...r.kernel.org>,
        "'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
        "Matthias Wystrik" <mwystrik@...-group.com>
Subject: AW: AW: AW: PROBLEM: Kernel Oops in UDP stack

Hi everyone,

I did three things that evening.
* I created a small dts file, so I could boot a 3.5.7 kernel.
* Ported the pskb_expand_head from 3.5.7 to 3.4.113
* Ported the whole skbuf.{c,h} file from 3.5.7 to 3.4.113

Sadly enough the second and third one panicked as well, but interestingly not the first one (3.5.7 with a simple dts file). Now the question is: Is something changed outside of the skbuf (maybe in udp.{c,h}?) or is it because the dts uses a different approach of talking to the MAC of the lpc3250?

I may try a more recent kernel with a dts file (maybe a 4.x.x one), but I think that will be impossible to backport a patch for our 2.6 kernel :(

If anybody has any more ideas about why the dts kernel does not panic, you're very welcome.

Mit freundlichen Grüßen / With kind regards

Marcel Hellwig
B. Sc. Informatik
Entwickler

m-u-t GmbH
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