Suspend sys.monitoring events inside sandbox importer #1327
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sys.monitoring callbacks (PEP 669) are global and fire on all threads. When tools like coverage register branch callbacks, they can trigger lazy imports inside the sandbox on Python 3.14+, causing RestrictedWorkflowAccessError and hanging the workflow. Suspend all sys.monitoring events while the sandbox importer is active and restore them on exit. Uses reference counting so concurrent sandbox activations from multiple worker threads correctly share state. Fixes temporalio#1326 Co-Authored-By: Claude Opus 4.6 <[email protected]>
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Summary
sys.monitoringevents while the sandbox importer is active, preventing global monitoring callbacks (e.g. coverage's branch tracer) from triggering lazy imports inside the sandboxTest plan
coverage run --branchon Python 3.14 — should complete instead of hanging🤖 Generated with Claude Code