runtime: aix/ppc64 builders failing with new on-demand gcmask

[randall77]

Go version

tip

Output of go env in your module/workspace:

AR='ar'
CC='clang'
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_ENABLED='1'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
CXX='clang++'
GCCGO='gccgo'
GO111MODULE=''
GOARCH='arm64'
GOARM64='v8.0'
GOAUTH='netrc'
GOBIN=''
GOCACHE='/Users/khr/Library/Caches/go-build'
GODEBUG=''
GOENV='/Users/khr/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFIPS140='off'
GOFLAGS=''
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/z9/dty110711l9cr9w3ktv1_2380000gn/T/go-build1049870315=/tmp/go-build -gno-record-gcc-switches -fno-common'
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMOD='/Users/khr/sandbox/tmp4/src/go.mod'
GOMODCACHE='/Users/khr/gopath/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/khr/gopath'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/Users/khr/sandbox/tmp4'
GOSUMDB='sum.golang.org'
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/khr/Library/Application Support/go/telemetry'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/Users/khr/sandbox/tmp4/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='devel go1.24-a9dac07ffc Fri Nov 22 09:07:21 2024 -0800'
GOWORK=''
PKG_CONFIG='pkg-config'

What did you do?

Look at build.golang.org, the aix/ppc64 column. It's all red, as of https://go-review.googlesource.com/c/go/+/616255.
For instance, https://build.golang.org/log/f520a7726768292ddd7a1157b1f2f91a269f7a97

It is failing when trying to do an atomic operation. The address looks strange, probably it isn't mapped.
I suspect what is happening is that aix/ppc64 doesn't do relocations from the rodata section to the data section correctly. (I think I remember something like that from long ago in my brain, not sure.)

If an aix and/or ppc64 person can confirm, I can think about how we might fix it. It may be tricky.

@golang/aix @golang/ppc64

What did you see happen?

segfault

What did you expect to see?

no segfault

[gabyhelp]

Related Issues

• runtime: AIX build broken with SIGSEGV #70483
• cmd/dist: SIGSEGV during bootstrap on aix-ppc64 #58857 (closed)
• gccgo: runtime address space conflict on AIX #24994 (closed)
• cmd/link: function "decodetypeGcmask" read gcdata from shared object file may not correct when use `lld` link in linux/arm64 #69466
• runtime: ppc64x binaries randomly segfault on linux 5.13rc6 #46803 (closed)
• runtime: dependency on AVX instruction set added in Go 1.14 on macOS #37477 (closed)
• runtime: "fatal: morestack on g0" with PGO enabled on arm64 #62120 (closed)
• cmd/compile: compiler built with PGO crashes occasionally on ppc64{le} #60368 (closed)
• runtime: add race detector for ios/arm64 #39521
• go build use -asan it panic. #69225 (closed)

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[randall77]

Whoops, dup of #70483.