atproto relay implementation in zig
zlay.waow.tech
fix Dockerfile: Evented requires ReleaseFast, not ReleaseSafe
Evented + ReleaseSafe GPFs immediately on startup in fiber.zig
contextSwitch — confirmed in production deploy, same as the repro.
this was already documented in devlog 008 and stdlib-patches.md.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Dockerfile
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Dockerfile
···
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# then copy source and build
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COPY src/ src/
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# ReleaseSafe: the production SIGSEGV was a websocket bug, not a fiber issue.
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# trying Evented + ReleaseSafe — if the repro GPF hits production, fall back to ReleaseFast.
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# ReleaseFast: Evented + ReleaseSafe GPFs immediately on startup (fiber.zig
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# contextSwitch, confirmed 2026-04-05). This is a zig codegen bug, not our code.
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# ReleaseFast avoids the bad optimization path. The previous production SIGSEGV
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# under ReleaseFast was a websocket handshake bug, now fixed (9ac64da).
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RUN zig build -Doptimize=ReleaseSafe -Dcpu=baseline -Dtarget=x86_64-linux-gnu
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FROM --platform=linux/amd64 debian:bookworm-slim
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src/main.zig
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src/main.zig
···
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// is NOT patched; subscribers resolve hostnames through pool_io (Threaded) instead.
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//
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// History: 28 commits of cross-Io fixes (see docs/evented-attempt.md). The
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// production SIGSEGV that prompted a Threaded revert turned out to be a websocket
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// handshake bug (TCP split mid-CRLF), not a fiber issue. Fixed in websocket.zig
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// 9ac64da. The repro (scripts/repro_evented.zig) still GPFs under ReleaseSafe
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// but production code paths may differ — deploying ReleaseSafe to find out.
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// production SIGSEGV that prompted a brief Threaded revert turned out to be a
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// websocket handshake bug (TCP split mid-CRLF), not a fiber issue. Fixed in
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// websocket.zig 9ac64da. Evented + ReleaseSafe GPFs immediately on startup
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// (same as repro) — must build with ReleaseFast.
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const Backend = Io.Evented;
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var backend: Backend = undefined;