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I was attempting to increase the number of virtual workspaces using
gnomecc.   I clicked on the "workspaces" tab and the system hung.  (I could
not ping it from other workstations, CTRL+ALT+F1-F7 didn't work,
CTRL+ALT+BACKSPACE to exit X, etc)  Upon inspection of /var/log/message, I
saw the following:

Feb  3 13:32:11 bigbear pppd[13582]: secondary DNS address 209.244.0.4
Feb  3 13:34:18 bigbear kernel: kernel BUG at vmscan.c:517!
Feb  3 13:34:18 bigbear kernel: invalid operand: 0000
Feb  3 13:39:54 bigbear syslogd 1.4-0: restart.

The first and last lines are not relevant to the crash, I included them
simply for context.  As of right now I cannot reproduce the bug but will
try to mimic the situation more exactly later.

Reproducible: Couldn't Reproduce

System specs:

Red Hat Linux 7.0.90 (Fisher)
Athlon 1100Mhz, Asus A7V mainboard (KT133 chipset)
256M Crucial memory
Intel InBusiness 10/100 Network Adapter
Asus GeForce2 V7700 video card
Creative Sound Blaster Live X-Gamer 5.1 PCI Audio
Adaptec 2930 SCSI Adapter (all SCSI system)

Kernel modules installed:
Module                  Size  Used by
usb-storage            24992   0  (unused)
sr_mod                 14752   0  (autoclean)
cdrom                  27136   0  (autoclean) [sr_mod]
ppp_async               6128   1  (autoclean)
ppp_generic            15968   3  (autoclean) [ppp_async]
NVdriver              606896  11  (autoclean)
eepro100               16368   1  (autoclean)
ipchains               33440   0  (unused)
cpia_pp                 3728   0  (autoclean) (unused)
parport                24768   0  (autoclean) [cpia_pp]
cpia_usb                4640   0  (unused)
cpia                   44080   0  [cpia_pp cpia_usb]
videodev                4896   0  [cpia]
usb-uhci               22176   0  (unused)
usbcore                48960   1  [usb-storage cpia_usb usb-uhci]
aic7xxx               120176   4 
sd_mod                 11264   4 
scsi_mod               92240   3  [usb-storage sr_mod aic7xxx sd_mod]

The only modifications from stock on this sytem are the NVidia 0.9-6 X
driver & kernel module (compiled from source, installed without a hitch),
and the USB-Storage module for my Sandisk drive, which works much better
than in RH7.

I'd be more than happy to probive additional information, just email me.