{"record":{"id":"e328db18cfdee136","repo":"bytedance/deer-flow","slug":"timed-out-acquiring-memory-scope-lock-lock-path","errorCode":null,"errorMessage":"Timed out acquiring memory scope lock {lock_path}","messagePattern":"Timed out acquiring memory scope lock (.+?)","errorType":"exception","errorClass":"TimeoutError","httpStatus":null,"severity":"error","filePath":"backend/packages/harness/deerflow/agents/memory/backends/deermem/deermem/core/storage.py","lineNumber":370,"sourceCode":"        while not acquired:\n            try:\n                if os.name == \"nt\":\n                    import msvcrt\n\n                    handle.seek(0, os.SEEK_END)\n                    if handle.tell() == 0:\n                        handle.write(b\"0\")\n                        handle.flush()\n                    handle.seek(0)\n                    msvcrt.locking(handle.fileno(), msvcrt.LK_NBLCK, 1)\n                else:\n                    import fcntl\n\n                    fcntl.flock(handle.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)\n                acquired = True\n            except OSError:\n                if time.monotonic() >= deadline:\n                    raise TimeoutError(f\"Timed out acquiring memory scope lock {lock_path}\")\n                time.sleep(0.05)\n        yield\n    finally:\n        if acquired:\n            try:\n                if os.name == \"nt\":\n                    import msvcrt\n\n                    handle.seek(0)\n                    msvcrt.locking(handle.fileno(), msvcrt.LK_UNLCK, 1)\n                else:\n                    import fcntl\n\n                    fcntl.flock(handle.fileno(), fcntl.LOCK_UN)\n            except OSError:\n                logger.warning(\"Failed to release memory scope lock %s\", lock_path)\n        handle.close()\n","sourceCodeStart":352,"sourceCodeEnd":388,"githubUrl":"https://github.com/bytedance/deer-flow/blob/1dd6ba1acb03700589994b0366c5d1c7d05e2eff/backend/packages/harness/deerflow/agents/memory/backends/deermem/deermem/core/storage.py#L352-L388","documentation":"Error \"Timed out acquiring memory scope lock {lock_path}\" thrown in bytedance/deer-flow.","triggerScenarios":"Thrown at backend/packages/harness/deerflow/agents/memory/backends/deermem/deermem/core/storage.py:370 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":["Check for a stale lock file at the named lock_path and remove it if no process holds it.","Reduce concurrent memory writers; retry after the current writer releases the lock."],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"1dd6ba1acb03700589994b0366c5d1c7d05e2eff","analyzedAt":"2026-08-14T21:20:34.804Z","schemaVersion":2},"datasetVersion":"2026-08-15T22:17:37.221Z"}