python runtime_error ai_generated true

asyncio.exceptions.InvalidStateError: Future is already resolved

ID: python/asyncio-future-invalid-state

Also available as: JSON · Markdown · 中文
80%Fix Rate
84%Confidence
0Evidence
2025-12-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.8 active — — —
3.9 active — — —

Root Cause

Attempting to set a result or exception on a Future that has already been resolved (completed or cancelled).

generic

中文

尝试在已解决（已完成或已取消）的 Future 上设置结果或异常。

Workarounds

  1. 90% success Check if the future is done before setting result 
    if not future.done():
    future.set_result(value)
  2. 85% success Use asyncio.Future with proper lifecycle management 
    future = asyncio.get_event_loop().create_future()
# ensure only one set_result call

Dead Ends

Common approaches that don't work:

  1. Checking if the future is done before setting result 50% fail

    If done, setting result is still invalid; this may cause the error if not handled properly.

  2. Using a new Future for each operation 40% fail

    This may lead to resource leaks if old futures are not cleaned up.