rob thijssen
fcb1f3b033
The neuron CUDA builds SIGSEGV'd rustc in LLVM's SROA pass on candle-core whenever sccache was the wrapper, but compiled fine without it. Root cause: the workflow pre-starts the sccache server in a bare shell (`sccache --start-server`), so per sccache's documented behaviour the orphaned server creates its OWN jobserver with one slot per CPU core (24 on quadbrat), ignoring Cargo's CARGO_BUILD_JOBS=8. rustc then runs up to 24-way parallel LLVM codegen; on candle-core's huge cuda-feature functions the concurrent SROA passes overflow the default 8 MiB codegen-thread stack and kill rustc with SIGSEGV — the exact "set RUST_MIN_STACK" case rustc prints. Cargo's own 8-slot jobserver (the no-sccache path) stays within budget and compiles. Set RUST_MIN_STACK=32 MiB in the standalone Rust images (runner-rust, runner-cuda-13.0, runner-rust-ubuntu); the gtk3/ffmpeg/deb images inherit it. It's rustc's own recommended mitigation, virtual-only until used, and protects every repo regardless of how it drives sccache. Pair with raising the cuda runner image's mem_request_mb so the parallel codegen has headroom. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
29 lines
1.1 KiB
Docker
29 lines
1.1 KiB
Docker
FROM git.lair.cafe/gongfoo/runner-ubuntu-24.04:latest
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ARG SCCACHE_VERSION=0.15.0
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ENV DEBIAN_FRONTEND=noninteractive
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# Codegen-thread stack headroom — see images/runner-rust/Containerfile. A
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# pre-started sccache server (no Cargo jobserver) fans rustc codegen out to
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# every CPU core; the resulting concurrent LLVM passes can overflow the
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# default 8 MiB codegen stack and SIGSEGV rustc. 32 MiB is virtual-only until
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# used. Inherited by runner-deb.
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ENV RUST_MIN_STACK=33554432
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RUN apt-get update && apt-get install -y --no-install-recommends \
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rustc \
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cargo \
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rust-clippy \
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rustfmt \
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gcc \
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pkg-config \
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libssl-dev \
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&& rm -rf /var/lib/apt/lists/*
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RUN curl -fsSL \
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"https://github.com/mozilla/sccache/releases/download/v${SCCACHE_VERSION}/sccache-v${SCCACHE_VERSION}-x86_64-unknown-linux-musl.tar.gz" \
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| tar xz -C /tmp \
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&& install -m 755 /tmp/sccache-v${SCCACHE_VERSION}-x86_64-unknown-linux-musl/sccache /usr/local/bin/sccache \
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&& rm -rf /tmp/sccache-v${SCCACHE_VERSION}-x86_64-unknown-linux-musl
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