From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dominik Brodowski <linux@dominikbrodowski.de>
Subject: Re: cpufreq segfaults when network cable plugged in
Date: Sun, 25 Apr 2004 15:44:20 +0200
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To: Simon Cooper <thecoop@runbox.com>
Cc: cpufreq@www.linux.org.uk


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On Mon, Apr 12, 2004 at 07:00:24PM +0100, Simon Cooper wrote:
> On Mon, 12 Apr 2004 10:30:58 +0200
> Dominik Brodowski <linux@dominikbrodowski.de> wrote:
>=20
> > On Mon, Apr 12, 2004 at 12:43:35AM +0100, Simon Cooper wrote:
> > > right, this is very strange, cpufreq (compiled into the kernel) segfa=
ults
> > > whenever the network cable on my laptop is plugged in on bootup but b=
oots
> > > ok when it is plugged in after the kernel has loaded. i can post the =
entire
> > > segfault msg but it'll need me to write it all down. driver is 'r8139'
> > > (1000Mbps card), kernel version 2.6.5-mm2
> >=20
> > Hm, this is really very strange.=20
> >=20
> > Which cpufreq drivers do you use / are compiled into the kernel?
> > What are the last two to four functions called, where's the EIP at
> > the segfault? [the first few function names mentioned in the oops]
> >=20
> > Thanks,
> > 	Dominik
> >=20
>=20
> well, technically its a kernel oops (attempted ot kill init). powersave a=
nd performance govenors are compiled in, using p4_clockmod driver. Sometime=
s it boots fine with the cable in, but it oops's most of the time:
>=20
> Unable to handle kernel NULL pointer dereference at virtual address 00000=
018
> ...
> EIP: 0060:[<c02f7c45>]  Not tainted VLI
> EIP is at cpufreq_notify_transition+0x79/0x98
> ...
> Call trace:
> [<c010f543>] cpufreq_p4_setdc+0x1eb/0x306
> [<c01706d3>] d_lookup+0x29/0x52
> [<c010f6bb>] cpufreq_p4_target+0x5d/0x69
> [<c02f757d>] __cpufreq_driver_target+0x22/0x26
> ...

This very strange. Especially as all such NULL pointer dereferences would
already happen _earlier_. It seems to me that this might be a bug in the
networking driver, which -randomly?- affects unrelated other
kernel/userspace components...

	Dominik

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