cmd/compile: [signal SIGBUS: bus error] on Apple Silicon DTK (amd64 emulation) #41933
Comments
That address is bad. First, it is not aligned correctly (it should be 8-byte aligned). Second, it should start with 0xc0 like all the other heap addresses in the trace. Looks like some corruption happened somehow. That's not the first access to that address in that function, so it doesn't make sense that it faults here but not earlier. (Actually, that specific address is not accessed, but 8 bytes earlier and 8 bytes later are.) I don't really understand why it bus errors instead of segv. amd64 allows unaligned accesses. Is there something else interesting at that address, or is it just plain unmapped? Any chance this is a bug in the emulator? 1.13.7 is now unsupported. You should probably upgrade to 1.15. 1.16 will probably have native support for apple silicon. Follow along at #38485. |
dmitshur
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Thanks for the report. Given it has happened just once, in an old unsupported version, and the error doesn't make much sense, we can probably close this issue for now. It can be re-opened if it happens again with a supported version of Go. |
dmitshur
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WaitingForInfo
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If you try Go 1.15 (or 1.14 or tip), set environment variable |
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Thanks all! I'm happy to close, and will upgrade to go 1.15, and raise a new issue if it happens again. However I suspect too it is likely to be a problem with Rosetta 2 amd64 emulation in macOS Big Sur, since I never saw this on our intel macs running the same binary versions. |
What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
Not sure. I only saw it once even on go 1.13.7, so could be a flake.
What operating system and processor architecture are you using (
go env)?This is an Apple Silicon DTK (arm64) running go 1.13.7 darwin/amd64 via emulation
go envOutputWhat did you do?
export ENGINE='multiuser' export GITHUB_SHA='5ebc949affbb5c3ca2d7fb4fa22c66c727fb4147' export NO_TEST_SKIP='true' export GITHUB_CLONE_URL='https://github.com/taskcluster/taskcluster' function b64 { [ "$(uname -s)" != "Darwin" ] || base64 -D [ "$(uname -s)" != "Linux" ] || base64 -d } # go test: -race and -msan are only supported on linux/amd64, freebsd/amd64, darwin/amd64 and windows/amd64 if [ "$(uname -m)" == "x86_64" ]; then RACE=-race CGO_ENABLED_TESTS=1 # See https://github.com/golang/go/issues/27089#issuecomment-415329050 VET=-vet=off else RACE= CGO_ENABLED_TESTS=0 VET= fi export CGO_ENABLED=0 export GOROOT="$(pwd)/go1.13.7/go" export GOPATH="$(pwd)/gopath1.13.7" export PATH="${GOPATH}/bin:${GOROOT}/bin:$(pwd)/bin:${PATH}" git --version go version go env curl -s "${TASKCLUSTER_PROXY_URL}/secrets/v1/secret/project/taskcluster/testing/generic-worker/ci-creds" | sed -n 's/.*"b64_encoded_credentials_script": "\(.*\)".*/\1/p' | b64 > tc-creds.sh source tc-creds.sh if [ ! -d taskcluster/.git ]; then rm -rf taskcluster git clone "${GITHUB_CLONE_URL}" taskcluster fi cd taskcluster git fetch "${GITHUB_CLONE_URL}" "+${GITHUB_SHA}:refs/heads/X${TASK_ID}" git checkout -f "X${TASK_ID}" git reset --hard "${GITHUB_SHA}" git clean -fdx git checkout -B tmp -t "X${TASK_ID}" cd workers/generic-worker # go.mod and go.sum will be affected by above go get commands, so # tidy them before checking for changes. Not needed in go 1.14: # https://github.com/golang/go/issues/30515#issuecomment-581984371 # TODO: use go get -modfile instead when running go 1.14, and remove # go mod tidy command go mod tidy git status # output of wc command can contain spaces on darwin, so no quotes around expression test $(git status --porcelain | wc -l) == 0 go install -tags "${ENGINE}" -v -ldflags "-X main.revision=${GITHUB_SHA}" ./... go install ../../tools/taskcluster-proxy go install ../../tools/livelog go vet -tags "${ENGINE}" ./... if [ "${ENGINE}" == "multiuser" ]; then cp "${TASK_USER_CREDENTIALS}" next-task-user.json # IMPORTANT - run go test with GW_TESTS_RUN_AS_CURRENT_USER=true *before* running it without # otherwise tests that call `go run ....` will write go object files to .cache as root GW_TESTS_RUN_AS_CURRENT_USER=true GORACE=history_size=7 CGO_ENABLED=1 go test -tags "${ENGINE}" -timeout 45m -ldflags "-X github.com/taskcluster/taskcluster/v37/workers/generic-worker.revision=${GITHUB_SHA}" -v ${RACE} ${VET} fi GORACE=history_size=7 CGO_ENABLED=${CGO_ENABLED_TESTS} go test -tags "${ENGINE}" -timeout 45m -ldflags "-X github.com/taskcluster/taskcluster/v37/workers/generic-worker.revision=${GITHUB_SHA}" -v ${RACE} ${VET} ./... ../../../golangci-lint/golangci-lint-1.23.6-*/golangci-lint run --build-tags "${ENGINE}" --timeout=15mWhat did you expect to see?
Successful build and compile
What did you see instead?
See: https://community-tc.services.mozilla.com/tasks/fwS_jRPvTX-pGnGdqaXLag/runs/0 for full details (executed commands, full logs, etc)
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