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[release/3.0] HTTP2: Ensure we don't try to send RST_STREAM or EndStream while holding the stream lock #40180
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Fixes #40115
Description
Sending a frame -- specifically, calling SendRstStreamAsync or SendEndStreamAsync -- can fail, which causes active streams to be aborted. Avoid doing this under the stream lock, to prevent lock reentrancy issues.
Impact
Fixes test asserts. Avoids any potential issues caused by accidental lock reentrancy here.
Regression
No
Risk
Low
@danmosemsft