Distribution/Version: Gentoo w/2.6.11.3

To reproduce, just use the program. It seems to just hang randomly every now and
then, maybe once or twice a day. There doesn't seem to be any real pattern I've
found, except that it tends to occur either under reasonably heavy system load,
such as when compiling a program, and it tends to occur when clicking an icon,
but sometimes I'll just minimise a window to see the desktop and notice that
it's completely frozen. 
If it freezes as I click the icon, it hangs with the icon that I just clicked in
that brightened stage, not blue yet, and it doesn't launch what I had clicked.
Attached the hung nautilus with gdb and then got these:
(gdb) info threads
  10 Thread -1226216528 (LWP 21684)  0xffffe410 in ?? ()
  9 Thread -1236046928 (LWP 21687)  0xffffe410 in ?? ()
  8 Thread -1238750288 (LWP 21688)  0xffffe410 in ?? ()
  7 Thread -1239016528 (LWP 21689)  0xffffe410 in ?? ()
  6 Thread -1239282768 (LWP 21690)  0xffffe410 in ?? ()
  5 Thread -1239549008 (LWP 21691)  0xffffe410 in ?? ()
  4 Thread -1239815248 (LWP 21692)  0xffffe410 in ?? ()
  3 Thread -1240081488 (LWP 21693)  0xffffe410 in ?? ()
  2 Thread -1240347728 (LWP 21694)  0xffffe410 in ?? ()
  1 Thread -1223924032 (LWP 21680)  0xffffe410 in ?? ()
(gdb) bt

+ Trace 59170

(gdb) info registers
eax            0xfffffffc       -4
ecx            0x0      0
edx            0x2      2
ebx            0xb72257e0       -1222486048
esp            0xbfffc8c4       0xbfffc8c4
ebp            0xbfffc8f8       0xbfffc8f8
esi            0x0      0
edi            0x8584820        140003360
eip            0xffffe410       0xffffe410
eflags         0x200246 2097734
cs             0x73     115
ss             0x7b     123
ds             0x7b     123
es             0x7b     123
fs             0x0      0
gs             0x33     51