Messages in this thread | | | From | Markus <> | Subject | Re: objtool segfault with ORC unwinder enabled | Date | Thu, 04 Jan 2018 17:56:30 +0100 |
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On Thursday, 4 January 2018 16:46:13 CET Josh Poimboeuf wrote: > On Wed, Jan 03, 2018 at 06:26:19PM +0100, Markus wrote: > > > > > I'm unable to recreate. Can you attach one of the .o files (like > > > > > the > > > > > above irq.o)? > > > > > > > > Sure, see attached. (From vanilla linux-4.14.11.) > > > > > > There's something weird with the toolchain. The object file doesn't > > > have an ELF section symbol for the .irqentry.text section. > > > > > > Are there any special KCFLAGS being added? Can you build the object > > > with V=1 to show the full gcc command line? > > > > I have not added anything. There is no env variable set like $KCFLAGS or > > $CFLAGS. (If that was the question.) > > > > I think you mean this line from output: > > gcc -Wp,-MD,arch/x86/kernel/.irq.o.d -nostdinc -isystem > > /usr/lib/gcc/x86_64- pc-linux-gnu/6.4.0/include -I./arch/x86/include > > -I./arch/x86/include/generated -I./include -I./arch/x86/include/uapi > > -I./arch/x86/include/generated/uapi -I./ include/uapi > > -I./include/generated/uapi -include ./include/linux/kconfig.h - > > D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict- > > aliasing -fno-common -fshort-wchar -Werror-implicit-function-declaration > > -Wno- format-security -std=gnu89 -fno-PIE -mno-sse -mno-mmx -mno-sse2 > > -mno-3dnow - mno-avx -m64 -falign-jumps=1 -falign-loops=1 -mno-80387 > > -mno-fp-ret-in-387 - mpreferred-stack-boundary=3 -mskip-rax-setup > > -mtune=generic -mno-red-zone - mcmodel=kernel -funit-at-a-time > > -DCONFIG_AS_CFI=1 - > > DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 > > -DCONFIG_AS_FXSAVEQ=1 -DCONFIG_AS_SSSE3=1 -DCONFIG_AS_CRC32=1 > > -DCONFIG_AS_AVX=1 -DCONFIG_AS_AVX2=1 - DCONFIG_AS_AVX512=1 > > -DCONFIG_AS_SHA1_NI=1 -DCONFIG_AS_SHA256_NI=1 -pipe -Wno- sign-compare > > -fno-asynchronous-unwind-tables -fno-delete-null-pointer-checks - > > Wno-frame-address -O2 --param=allow-store-data-races=0 -DCC_HAVE_ASM_GOTO > > - Wframe-larger-than=2048 -fno-stack-protector > > -Wno-unused-but-set-variable - Wno-unused-const-variable > > -fomit-frame-pointer -fno-var-tracking-assignments - > > Wdeclaration-after-statement -Wno-pointer-sign -fno-strict-overflow -fno- > > stack-check -fconserve-stack -Werror=implicit-int > > -Werror=strict-prototypes - Werror=date-time > > -Werror=incompatible-pointer-types -Werror=designated-init - > > Iarch/x86/kernel/../include/asm/trace -DKBUILD_BASENAME='"irq"' - > > DKBUILD_MODNAME='"irq"' -c -o arch/x86/kernel/.tmp_irq.o > > arch/x86/kernel/irq.c > > > > The next line is the objtool that segfaults. > > I don't see anything unusual there. Are there any Gentoo patches > against either the kernel or GCC which would strip unused symbols?
The kernel is the vanilla kernel. (4.14.11 and also 4.15-rc6) Its not a gentoo specific gcc patch. (Then every gentoo user would be affected?)
But I enabled ld.gold as default linker like 5 years ago. Never had a problem with this.
Is ld.gold supposed to fail here?
I switched back to ld.bfd and it seems to work.
BR, Markus
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