Distribution: Gentoo
Hardware Environment: On three separate G4 based systems. G4 windtunnel, TiBook,
Mac Mini
Software Environment: gcc, X, kde, etc.
Problem Description:

I am experiencing random segfaults with kernel 2.6.11 and up. Usualy happens
after running for a day or two. Heavy emerging/compiling seems to bring it on
faster.
It seems that the problem goes away after I disable "Preemtible Kernel" option
in the the kernel config. I experienced this problem on G4 Windtunnel as well as
on G4 TiBook and Mac Mini.

Reproducible: Sometimes
Steps to Reproduce:
No exact steps to reproduce it. Just emerge something heavy like Firefox.
Problem should manifest.
Actual Results:  
powerpc-unknown-linux-gnu-gcc -o prmwait.o -c    -mtune=G4 -mabi=altivec -pipe
-pipe -ansi  -pthread -O2 -fPIC  -UDEBUG -DMOZILLA_CLIENT=1 -DNDEBUG=1
-DXP_UNIX=1 -D_POSIX_SOURCE=1 -D_BSD_SOURCE=1 -D_SVID_SOURCE=1
-D_LARGEFILE64_SOURCE=1 -DHAVE_FCNTL_FILE_LOCKING=1 -DLINUX=1 -DHAVE_LCHOWN=1
-DHAVE_STRERROR=1 -D_REENTRANT=1  -DFORCE_PR_LOG -D_PR_PTHREADS
-UHAVE_CVAR_BUILT_ON_SEM -D_NSPR_BUILD_
-I/var/tmp/portage/mozilla-firefox-1.0.2/work/mozilla/dist/include/nspr
-I../../../pr/include -I../../../pr/include/private  prmwait.c
prmwait.c: In function `_MW_PollInternal':
prmwait.c:599: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://bugs.gentoo.org/> for instructions.
The bug is not reproducible, so it is likely a hardware or OS problem.
distcc[434] ERROR: compile prmwait.c on localhost failed