Buildresult: powerpc-fixes/mips-defconfig/mipsel-gcc5 built on Aug 2 2021, 02:47

kisskb

Revisions | Branches | Compilers | Configs | Build Results | Build Failures |

Status:	OK
Date/Time:	Aug 2 2021, 02:47
Duration:	0:01:01.043704
Builder:	ka7
Revision:	powerpc/vdso: Don't use r30 to avoid breaking Go lang (`a88603f4b92ecef9e2359e40bcb99ad399d85dd7)`
Target:	powerpc-fixes/mips-defconfig/mipsel-gcc5
Branch:	powerpc-fixes
Compiler:	mipsel-gcc5 (mipsel-linux-gcc.br_real (Buildroot 2016.11-git-00613-ge98b4dd) 5.4.0 / GNU ld (GNU Binutils) 2.26.1)
Config:	defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify a88603f4b92ecef9e2359e40bcb99ad399d85dd7^{commit} a88603f4b92ecef9e2359e40bcb99ad399d85dd7 already have revision, skipping fetch # git checkout -q -f -B kisskb a88603f4b92ecef9e2359e40bcb99ad399d85dd7 # git clean -qxdf # < git log -1 # commit a88603f4b92ecef9e2359e40bcb99ad399d85dd7 # Author: Michael Ellerman <mpe@ellerman.id.au> # Date: Thu Jul 29 22:56:36 2021 +1000 # # powerpc/vdso: Don't use r30 to avoid breaking Go lang # # The Go runtime uses r30 for some special value called 'g'. It assumes # that value will remain unchanged even when calling VDSO functions. # Although r30 is non-volatile across function calls, the callee is free # to use it, as long as the callee saves the value and restores it before # returning. # # It used to be true by accident that the VDSO didn't use r30, because the # VDSO was hand-written asm. When we switched to building the VDSO from C # the compiler started using r30, at least in some builds, leading to # crashes in Go. eg: # # ~/go/src$ ./all.bash # Building Go cmd/dist using /usr/lib/go-1.16. (go1.16.2 linux/ppc64le) # Building Go toolchain1 using /usr/lib/go-1.16. # go build os/exec: /usr/lib/go-1.16/pkg/tool/linux_ppc64le/compile: signal: segmentation fault # go build reflect: /usr/lib/go-1.16/pkg/tool/linux_ppc64le/compile: signal: segmentation fault # go tool dist: FAILED: /usr/lib/go-1.16/bin/go install -gcflags=-l -tags=math_big_pure_go compiler_bootstrap bootstrap/cmd/...: exit status 1 # # There are patches in flight to fix Go[1], but until they are released # and widely deployed we can workaround it in the VDSO by avoiding use of # r30. # # Note this only works with GCC, clang does not support -ffixed-rN. # # 1: https://go-review.googlesource.com/c/go/+/328110 # # Fixes: ab037dd87a2f ("powerpc/vdso: Switch VDSO to generic C implementation.") # Cc: stable@vger.kernel.org # v5.11+ # Reported-by: Paul Menzel <pmenzel@molgen.mpg.de> # Tested-by: Paul Menzel <pmenzel@molgen.mpg.de> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # Link: https://lore.kernel.org/r/20210729131244.2595519-1-mpe@ellerman.id.au # < /opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-gcc --version # < /opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux-ld --version # < git log --format=%s --max-count=1 a88603f4b92ecef9e2359e40bcb99ad399d85dd7 # < make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux- defconfig # < make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux- help # make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux- olddefconfig # make -s -j 32 ARCH=mips O=/kisskb/build/powerpc-fixes_mips-defconfig_mipsel CROSS_COMPILE=/opt/cross/kisskb/br-mipsel-o32-full-2016.08-613-ge98b4dd/bin/mipsel-linux- Completed OK # rm -rf /kisskb/build/powerpc-fixes_mips-defconfig_mipsel # Build took: 0:01:01.043704

© Michael Ellerman 2006-2018.