Fix k8s tentacle multi-arch Docker build crash under QEMU - #1276
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LukeButters merged 1 commit intoAug 3, 2026
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The multi-arch k8s tentacle build was crashing with Go compiler panics (fatal error: found pointer to free object / growslice: len out of range) when building the arm64 image on an amd64 agent, because the golang builder stage ran under QEMU emulation instead of natively. The stage only cross-compiles via GOOS/GOARCH, so pinning it to --platform=$BUILDPLATFORM keeps go build running natively and avoids the emulated crash. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
LukeButters
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August 3, 2026 05:25
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Summary
Kubernetes Tentacle Multi-Arch Docker imagebuild (9.2.4233-main-nightly) was failing with Go compiler panics (fatal error: found pointer to free object,panic: runtime error: growslice: len out of range) while building thebootstraprunnerbuilderstage.docker buildx build --platform linux/arm64,linux/amd64 ...runs thegolang:1.26builder stage under QEMU emulation for the non-native target platform (arm64 on the amd64 build agent). The stage only needsGOOS/GOARCHcross-compilation, never execution of foreign-arch code, but without a platform pin buildx still runs the compiler itself under QEMU — a known source of Go runtime memory-corruption crashes.--platform=$BUILDPLATFORM(Docker's standard pattern for Go cross-compile stages) sogo buildalways runs natively on the build host and cross-compiles viaGOARCH, in bothdocker/kubernetes-agent-tentacle/Dockerfileand the equivalentdev/Dockerfile.Test plan
bootstraprunnerbuilderstage locally viadocker buildx build --target bootstraprunnerbuilderfor a foreign target platform, confirming it builds successfully and produces allbootstrapRunner-linux-{amd64,arm64,386,arm}binaries.Kubernetes Tentacle Multi-Arch Docker imagebuild on TeamCity to confirm the arm64-on-amd64 crash is resolved (couldn't reproduce the exact amd64-host/arm64-QEMU crash locally since my dev machine is arm64).🤖 Generated with Claude Code