I initially filed this on bugzilla.redhat.com, bug number 176994, but they
requested that I move it here.

I have a TYAN S2882-D mobo with two Opteron 250 CPUs, total of 4 Gigs of RAM, 2
Gigs per processor.

The video card is a PNY Nvidia FX 5500 (PCI bus, not AGP if that matters).
I have tried two sound cards, an Ensoniq 1370 and a Creative Audigy 2 ZS.  The
problem is the same for either sound card, and doesn't seem to be slot dependent.

If not using sound, the system runs for a day or more.  I start using audacity,
recording or playing back, and after a half minute or so, the entire display
freezes up.  I can still ping the box, and an ssh from another machine shows the
Xserver at 99.9% CPU.  If I kill -9 the Xserver, the box restarts X and I can
log in.

It does the same thing with gcdmaster playing back a wav file.  So it looks to
be an interaction between X and a sound card.

I did an strace on the Xserver, but I'm not sure it is meaningful - it reports
a buffer overflow in select, which I've seen listed in another bug as due to
tracing a 32-bit app on a 64-bit system.  I'll attach the trace anyway in case
it is helpful.

I can reproduce this 100% of the time on this machine, and I will gladly capture
any other data anyone might like to see.

Steps to Reproduce:
1.Start audacity
2.Start recording

Actual Results:  Screen freezes, Xserver goes to 99.9% CPU

I tried installing the proprietary nvidia driver:

     NVIDIA-Linux-x86_64-1.0-8178-pkg2.run

and the problem completely disappears.  So, I am currently suspecting the xorg
nv driver.