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Allow disable node v8 maglev jit compiler on node24. - #4447
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Pull request overview
This PR adds a targeted workaround in the JavaScript action handler to mitigate a Node.js 24 / V8 Maglev issue on Windows runners by conditionally disabling Maglev JIT at process startup, with an opt-out via an environment variable.
Changes:
- Detect Node 24 runtime on Windows x64 and prepend
--no-maglevto the Node invocation arguments. - Allow re-enabling Maglev via
ACTIONS_RUNNER_REENABLE_NODE_MAGLEVset either at the machine/process level or step-level env.
Show a summary per file
| File | Description |
|---|---|
| src/Runner.Worker/Handlers/NodeScriptActionHandler.cs | Conditionally adds --no-maglev to Node 24 invocation on Windows x64, with env-var override. |
Copilot's findings
- Files reviewed: 1/1 changed files
- Comments generated: 1
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| if (nodeRuntimeVersion.StartsWith("node24", StringComparison.OrdinalIgnoreCase) && | ||
| Constants.Runner.Platform == Constants.OSPlatform.Windows && | ||
| Constants.Runner.PlatformArchitecture == Constants.Architecture.X64 && | ||
| !StringUtil.ConvertToBoolean(System.Environment.GetEnvironmentVariable("ACTIONS_RUNNER_REENABLE_NODE_MAGLEV")) && | ||
| !StringUtil.ConvertToBoolean(Environment.GetValueOrDefault("ACTIONS_RUNNER_REENABLE_NODE_MAGLEV"))) |
yacaovsnc
previously approved these changes
May 26, 2026
yacaovsnc
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May 26, 2026
Contributor
Do you want to change behavior after the env is set? Up to you. |
yacaovsnc
previously approved these changes
May 26, 2026
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Reinaldotec
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Try to workaround nodejs/node#62260 for actions/runner on Windows
Setting machine level env
ACTIONS_RUNNER_DISABLE_NODE_MAGLEV=1or step level envACTIONS_RUNNER_DISABLE_NODE_MAGLEV=1