linux-kernel - 2.6.24-rc1: NULL pointer dereference using netconsole

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Message-ID: <32892.86.7.220.119.1193222572.squirrel@wmbeta.mxes.net>
Date:	Wed, 24 Oct 2007 11:42:52 +0100 (BST)
From:	"Andrew Nelless" <andrew@...less.net>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.24-rc1: NULL pointer dereference using netconsole

Hi,

I booted up 2.6.24-rc1 this morning [Real early over a brew ;-)] and was
having a problems with multiple ~5 second hangs on SATA/drive init
(Something to do with "EH" something-or-other and resets but I'll email
in separately about it later unless its fixed by the time I get the chance).

Anyway, I went to fire up netconsole to get a decent log dump and hit
across the following nasty. Netconsole works fine in 2.6.23.1 with a
similar config and the same kernel parameters.

A shot of the screen is the only method I could come up with to capture
the log, I hope that is OK, it is pretty readable.

The nasty:
http://andotnet.nfshost.com/linux/2.6.24-rc1-netconsole-nullderef.jpg

The config:
http://andotnet.nfshost.com/linux/config-2.6.24-rc1.txt

The 'old' 2.6.23.1 config:
http://andotnet.nfshost.com/linux/config-2.6.23.1.txt

Netconsole log from successfully booting 2.6.23.1:
http://andotnet.nfshost.com/linux/successful-nclog-2.6.23.1.txt

The hardware, etc:
eth0          : Netgear FA311 10/100Mbps ethernet adapter (netsemi driver)
                connected directly to another PC using a crossover cable.
cpu           : athlon64 3500+
compiler      : gcc 4.2.2
kernel params : root=/dev/sda3 vga=0x31B nmi_watchdog=0
                netconsole=@....168.2.1/eth0,6666@....168.2.2/00:11:d8:c0:5e:96

I hope this report is helpful and it's not too early in the release cycle,
I'm still pretty new and not subscribed, so please CC :-)

Btw, is it preferable for non-subscribers to use the kernel bugzilla? Or
post to the list?

Andrew (On his 3rd brew of the day)

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