------- Comment #9 from bdubbs at linuxfromscratch dot org 2010-05-16 06:38 ------- I have traced the problem file for this bug to the kernel file
arch/x86/kernel/tsc.c I have two source trees for the 2.6.33.4 kernel, one compiled with gcc-4.4.1 which works and gcc version 4.5.1 20100514 (prerelease) which fails. I have attached the config file that generates the error. I traced the problem to the above file, but don't know enough about the kernel and gcc internals to either parse it down much further or fix the problem. When I copy arch/x86/kernel/tsc.o from the 4.4.1 build to the 4.5.1 kernel tree and rebuild, the system (relatively generic Dell x86_64) boots properly. The file build command is: gcc -Wp,-MD,arch/x86/kernel/.tsc.o.d -nostdinc -isystem /usr/lib/gcc/x86_64-unknown-linux-gnu/4.5.1/include -I/sources/linux-2.6.33.4-gcc45/arch/x86/include -Iinclude -include include/generated/autoconf.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -Os -m64 -march=core2 -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -pipe -Wno-sign-compare -fno-asynchronous-unwind-tables -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-than=2048 -fno-stack-protector -fno-omit-frame-pointer -fno-optimize-sibling-calls -Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fno-dwarf2-cfi-asm -fconserve-stack -fno-stack-protector -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(tsc)" -D"KBUILD_MODNAME=KBUILD_STR(tsc)" -c -o arch/x86/kernel/tsc.o arch/x86/kernel/tsc.c When I tried removing the -Os option, it did not fix the problem. I'm guessing the problem is around lines 724-761 because of the ifdef CONFIG_X86_64 and the use of rdtsc_barrier() in the panic info above. I'm really at the limits of what I know how to do here. I think I rebuilt/rebooted a hundred times to narrow things down so far. Let me know if I can do anything else. Many Bothans died to bring us this information. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44129
