This gcc command causes a segmentation fault. The pre-processed file this output says to include in the bug report is far too large (675K) to inline in this report, and I see no way to attach it to the report. Let me know if you want me to email it or something.
gcc -v -save-temps -Wp,-MD,net/ipv4/.ip_output.o.d -nostdinc -isystem /usr/lib/gcc/i486-linux-gnu/4.1.2/include -D__KERNEL__ -Iinclude -include include/linux/autoconf.h -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -O0 -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -g -D__arch_um__ '-DSUBARCH="i386"' -Iarch/um/include -I/tom/linux/linux-uml/arch/um/include/skas -Dvmap=kernel_vmap -Din6addr_loopback=kernel_in6addr_loopback -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask -Dmktime=kernel_mktime -fno-unit-at-a-time -U__i386__ -Ui386 -march=i686 -mtune=pentium4 -mpreferred-stack-boundary=2 -ffreestanding -D_LARGEFILE64_SOURCE -Wdeclaration-after-statement -Wno-pointer-sign '-DKBUILD_STR(s)=#s' '-DKBUILD_BASENAME=KBUILD_STR(ip_output)' '-DKBUILD_MODNAME=KBUILD_STR(ip_output)' -c -o ip_output.o net/ipv4/ip_output.c Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --program-suffix=-4.1 --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr --with-tune=i686 --enable-checking=release i486-linux-gnu Thread model: posix gcc version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13) /usr/lib/gcc/i486-linux-gnu/4.1.2/cc1 -E -quiet -nostdinc -v -Iinclude -Iarch/um/include -I/tom/linux/linux-uml/arch/um/include/skas -D__KERNEL__ -D__arch_um__ -DSUBARCH="i386" -Dvmap=kernel_vmap -Din6addr_loopback=kernel_in6addr_loopback -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask -Dmktime=kernel_mktime -U__i386__ -Ui386 -D_LARGEFILE64_SOURCE -DKBUILD_STR(s)=#s -DKBUILD_BASENAME=KBUILD_STR(ip_output) -DKBUILD_MODNAME=KBUILD_STR(ip_output) -isystem /usr/lib/gcc/i486-linux-gnu/4.1.2/include -include include/linux/autoconf.h -MD net/ipv4/.ip_output.o.d net/ipv4/ip_output.c -march=i686 -mtune=pentium4 -mpreferred-stack-boundary=2 -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-aliasing -fno-common -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -fno-unit-at-a-time -ffreestanding -fworking-directory -O0 -fpch-preprocess -o ip_output.i #include "..." search starts here: #include <...> search starts here: include arch/um/include /tom/linux/linux-uml/arch/um/include/skas /usr/lib/gcc/i486-linux-gnu/4.1.2/include End of search list. /usr/lib/gcc/i486-linux-gnu/4.1.2/cc1 -fpreprocessed ip_output.i -quiet -dumpbase ip_output.c -march=i686 -mtune=pentium4 -mpreferred-stack-boundary=2 -auxbase-strip ip_output.o -g -O0 -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -Wdeclaration-after-statement -Wno-pointer-sign -version -fno-strict-aliasing -fno-common -fno-omit-frame-pointer -fno-optimize-sibling-calls -fasynchronous-unwind-tables -fno-unit-at-a-time -ffreestanding -o ip_output.s GNU C version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13) (i486-linux-gnu) compiled by GNU C version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13).GGC heuristics: --param ggc-min-expand=55 --param ggc-min-heapsize=48160 Compiler executable checksum: 87670b01f6c8def5369835011f9cd001 net/ipv4/ip_output.c: In function ip_output: net/ipv4/ip_output.c:217: internal compiler error: Segmentation fault Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://gcc.gnu.org/bugs.html> for instructions. For Debian GNU/Linux specific bug reporting instructions, see <URL:file:///usr/share/doc/gcc-4.1/README.Bugs>. Preprocessed source stored into /tmp/ccgHvFWq.out file, please attach this to your bugreport. -- Summary: gcc 4.1.2 segmentation fault Product: gcc Version: 4.1.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: gcc at tommay dot net http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29241