#3407 Fix run_sync failure when called from a running event loop Pull request opened by pingsutw Summary • Fix

RuntimeError: Cannot run the event loop while another loop is running

when

FlyteRemote.execute()

is called from within an already-running async event loop (e.g., Flask with Gunicorn) •

_AsyncLoopManager.run_sync()

now detects a running loop and spawns a short-lived thread with its own event loop via

asyncio.run()

, preserving context variables with

contextvars.copy_context()

• The original

_TaskRunner

path remains unchanged for non-async contexts Test plan • Added

test_run_sync_from_running_event_loop

— verifies

run_sync

works when called from within a running event loop • Added

test_run_sync_from_running_event_loop_with_exception

— verifies exceptions propagate correctly in this path • All existing tests in

tests/flytekit/unit/utils/test_asyn.py

pass (8/8) flyteorg/flytekit