Date: Tue, 21 Aug 2001 00:50:02 -0700 (PDT) From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/29845: 4.4-PRERELEASE crashes under heavy net I/O Message-ID: <200108210750.f7L7o2068935@freefall.freebsd.org>
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The following reply was made to PR kern/29845; it has been noted by GNATS.
From: Andre Albsmeier <andre.albsmeier@mchp.siemens.de>
To: David Malone <dwmalone@maths.tcd.ie>
Cc: Andre Albsmeier <andre.albsmeier@mchp.siemens.de>,
FreeBSD-gnats-submit@freebsd.org, Ian Dowse <iedowse@maths.tcd.ie>
Subject: Re: kern/29845: 4.4-PRERELEASE crashes under heavy net I/O
Date: Tue, 21 Aug 2001 09:43:14 +0200
On Sat, 18-Aug-2001 at 14:49:23 +0100, David Malone wrote:
> On Sat, Aug 18, 2001 at 01:33:22PM +0200, Andre Albsmeier wrote:
> > I have saved the crashdumps for further examination. As you can see,
> > the box crashes in whichever process it wants...
>
> I'd guess that something is freeing an mbuf while it is still in
> use. This would result in either a panic when the mbuf is corrupted
> while in use or a double freeing of the mbuf. This could plausable
> explain the panics you included trace backs for.
>
> I think Ian Dowse has some tools for examining the mbuf free lists
> in kernel dumps. He did also have some patches for catching writes
> to shared or free mbuf clusters, which might help figure out what's
> going on here.
>
> The only thing that doesn't tally is that this is only effecting
> your laptop and not all your machines.
OK, I have some news here:
1.) I put the harddisk into another machine of the same type (Siemens
Mobile 510 AGP). Same bad effects here. So we can be quite sure
it is no problem with RAM/CPU ...
2.) I tried the newest 4.4-RC1. Same problems.
Now it comes:
3.) I put the box into a docking station which got an Intel
Etherexpress PRO 100 sitting on the PCI bus. Now I can
stress the machine as much as I want... no problems.
As soon as I go back using the pccard stuff for networking
my problems are back.
It really seems to be somehow pccard related...
-Andre
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