fix(sandbox): serialize E2B release transitions#4355
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…UI hardening - bytedance#4117 XSS hardening (isSafeHref, iframe sandbox, safeLocalStorage) - bytedance#4354 streaming chunk batcher for large file tools - bytedance#4294 LLM concurrency cap + burst-rate retry shedding - bytedance#4355 E2B release serialization - bytedance#4267 transient image context cleanup - bytedance#4374 AI disclaimer (bytedance#4373 reasoning-effort default) - bytedance#4337 /goal length validation + counter - bytedance#4278/bytedance#4302/bytedance#4312 URL encoding fixes - bytedance#4375 list_uploaded_files schema fix - bytedance#4288 uploads markdown companion name claim - bytedance#4258 remove frontend debug logs
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What changed
acquire()and the fullrelease()state transition with the existing per-user/thread lockbackend/AGENTS.mdWhy
release()removed the active mappings before syncing outputs and publishing the warm-pool entry. A concurrent acquire for the same thread could observe neither state and reconnect or create a sandbox while release was still operating on the previous client.Impact
Within one Gateway process, a same-thread acquire now waits for release to finish, then reclaims the warm sandbox. Multi-process coordination remains outside this issue's stated scope.
Validation
pytest tests/test_e2b_sandbox_provider.py -q— 64 passedruff checkon the changed Python files — passedruff format --checkon the changed Python files — passedCloses #4333