Debug help please - artefacts, segfaults and crashes, oh my!

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Hi folks

Sorry for the relatively newbie post, but I'm unsure how to proceed with 
debugging a bizarre problem. Any assistance on what to do and what to look 
for is greatly appreciated!

In brief:
1. Watching TV using either xawtv or zapping results in random short stripes 
of video being drawn outside their respective windows, but these vanish when 
the screen is repainted (e.g. after a window is 'wiped' across the 
artefacts).
2. After watching TV for a while (minutes not hours), I start getting 
segfaults either from open applications or on launching new ones.
3. Given enough time (again in minutes), my machine is pretty much guaranteed 
to either hang hard or crashes!

So to the specifics:
Compaq Deskpro EN (SFF Series) PII, 350MHz, Mandrake 9.0
Hauppauge WinTV Go (model 607, UK PAL) card
2.4.19 (kernel built from source, but binary 2.4.19 stock kernel also fails)
bttv 0.7.105
xawtv 3.76
zapping 0.6.4
audio is currently being piped straight from the TV card line out to a set of 
speakers, so I'm not using ALSA / OSS drivers for the TV watching stuff.

I have uploaded some files to my web server (  http://m-thomson.net/v4l/  ) in 
the hope that they contain useful info:
dmesg.txt		output of 'dmesg'
kernel.config		.config file generated from 'make xconfig'
modules.conf		/etc/modules.conf in all its glory
syslog.txt		extracts from /var/log/syslog
screenshot.png	in the hope that a picture tells a thousand words...

Please let me know what other information and what steps I should take to 
track down the source of the problems!

Cheers
Mike

P.S. Why do I care about getting this old Deskpro working? It's a (borrowed) 
proof of concept box that I'm using to convince my wife that MythTV is a 
better option than TiVO. Therefore success means I should be allowed, nay 
ENCOURAGED to go out and buy a Shuttle XPC to run it on permanently!





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