stream_engine_base: ignore stale restart_input after reconnect #4830
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restart_input can be invoked after a write_activated notification that was queued before an engine error/heartbeat reconnect. A new engine starts with input running, so _input_stopped is false and the assert was firing. Make restart_input idempotent by returning early when input was not stopped, keeping restart behavior unchanged for real EAGAIN backpressure cases.
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This PR reproduces and fixes the
_input_stoppedassertion crash from #3937restart_inputcan be invoked after awrite_activatednotification that was queued before an engine error/heartbeat reconnect. A new engine starts with input running, so_input_stoppedisfalseand theassert was firing. This PR makes
restart_inputidempotent by returning early when input was not stopped, keeping restart behavior unchanged for realEAGAINbackpressure cases.Detailed explanation of the bug:
#3937 (comment)
Fixes:
#3937
Possibly fixes:
#4767 (Slow subscriber, RX queue full, heartbeat triggers reset)
#4229 (HWM configured (especially rcvhwm), random crashes)
#3596 (CLIENT/SERVER, heartbeat=1s, rcvhwm=1, slow consumer)
#4364 (PUB/SUB, heartbeat with small timeouts)