Description of problem:

X11 stops and am dumped back to the console with a backtrace like 

Backtrace:
0: X(xf86SigHandler+0xa8) [0x10083978]
1: [0x100374]
2: X(miComputeCompositeRegion+0x984) [0x10121dd4]
3: /usr/lib/xorg/modules/libfb.so(fbComposite+0x310) [0xea91a50]
4: /usr/lib/xorg/modules/libxaa.so(XAAComposite+0x1ac) [0xea2433c]
5: X [0x1013b604]
6: X(CompositePicture+0xfc) [0x101240fc]
7: X(miGlyphs+0x258) [0x101201f8]
8: /usr/lib/xorg/modules/libxaa.so(XAAGlyphs+0x220) [0xea22eb0]
9: X [0x1013b2b4]
10: X(CompositeGlyphs+0xcc) [0x1012421c]
11: X [0x1012c2c8]
12: X [0x10127c48]
13: X(Dispatch+0x238) [0x10045b08]
14: X(main+0x480) [0x10027260]
15: /lib/libc.so.6 [0xf51d540]
16: /lib/libc.so.6(__libc_start_main+0x144) [0xf51d764]

Fatal server error:
Caught signal 11.  Server aborting

 or

Backtrace:
0: X(xf86SigHandler+0xa8) [0x10083978]
1: [0x100374]
2: [(nil)]
3: /usr/lib/xorg/modules/libfb.so(fbComposite+0x310) [0xea91a50]
4: /usr/lib/xorg/modules/libxaa.so(XAAComposite+0x1ac) [0xea2433c]
5: X [0x1013b604]
6: X(CompositePicture+0xfc) [0x101240fc]
7: X(miTrapezoids+0x274) [0x10123194]
8: X(CompositeTrapezoids+0xbc) [0x101243dc]
9: X [0x1012cf6c]
10: X [0x10127c48]
11: X(Dispatch+0x238) [0x10045b08]
12: X(main+0x480) [0x10027260]
13: /lib/libc.so.6 [0xf51d540]
14: /lib/libc.so.6(__libc_start_main+0x144) [0xf51d764]

Fatal server error:
Caught signal 11.  Server aborting


It is not apparent to me as to what action is causing this - initially it
happened when moving the mouse over the kde panel, it has also happened while
scrolling pages in Firefox.

Bug has only occured since yum update, today.


Version-Release number of selected component (if applicable):

xorg-x11-drv-nv-1.2.0-3 was installed today.


How reproducible:

The more things going on on the screen, the more likely it is to happen.


Steps to Reproduce:

Make the screen busy.  And wait for an inconvenient moment.


Additional info:

Hardware info :
$ cat /proc/cpuinfo
processor       : 0
cpu             : PPC970FX, altivec supported
clock           : 900.000000MHz
revision        : 3.0 (pvr 003c 0300)

timebase        : 33333333
platform        : PowerMac
machine         : PowerMac8,1
motherboard     : PowerMac8,1 MacRISC4 Power Macintosh
detected as     : 338 (iMac G5)
pmac flags      : 00000000
L2 cache        : 512K unified
pmac-generation : NewWorld

$ /sbin/lspci
f0:0b.0 Host bridge: Apple Computer Inc. U3L AGP Bridge
f0:10.0 VGA compatible controller: nVidia Corporation NV34M [GeForce FX Go5200]
(rev a1)
0001:00:01.0 PCI bridge: Apple Computer Inc. Shasta PCI Bridge
0001:00:02.0 PCI bridge: Apple Computer Inc. Shasta PCI Bridge
0001:00:03.0 PCI bridge: Apple Computer Inc. Shasta PCI Bridge
0001:01:07.0 Class ff00: Apple Computer Inc. Shasta Mac I/O
0001:01:0b.0 USB Controller: NEC Corporation USB (rev 43)
0001:01:0b.1 USB Controller: NEC Corporation USB (rev 43)
0001:01:0b.2 USB Controller: NEC Corporation USB 2.0 (rev 04)
0001:02:0c.0 IDE interface: Broadcom K2 SATA
0001:02:0d.0 Class ff00: Apple Computer Inc. Shasta IDE
0001:02:0e.0 FireWire (IEEE 1394): Apple Computer Inc. Shasta Firewire
0001:03:0f.0 Ethernet controller: Apple Computer Inc. Shasta (Sun GEM)

Full Xorg.log attached.