Kernel Bug Tracker – Bug 4502
GCC, other applications segfault with kernels 2.6.11 - 12
Last modified: 2007-05-16 05:40:38 UTC
Hardware Environment: On three separate G4 based systems. G4 windtunnel, TiBook,
Software Environment: gcc, X, kde, etc.
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
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.
Steps to Reproduce:
No exact steps to reproduce it. Just emerge something heavy like Firefox.
Problem should manifest.
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
-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 ERROR: compile prmwait.c on localhost failed
I think CONFIG_PREEMPT is still not safe on PPC.
If you enable CONFIG_PREEMPT and CONFIG_SMP on ppc32 (even if this is a
uniprocessor machine), Preemption works quite fine.
I use it now for about two weeks on my G3 and G4 with a 2.6.10 and a 2.6.12_rc5
Yes, enabling CONFIG_SMP seems to fix the problem. Been running for two weeks
now, with no issues.
Downstream bug report: http://bugs.gentoo.org/show_bug.cgi?id=86544
Does this behavior still occur on the latest kernels?
Nope. I can use PREEMPT without SMP enabled. It's working since 2.6.16 or
Thanks Lars. Closing this bug out then.