fix(h2): return Poll::Pending when poll_capacity is not ready in UpgradedSendStreamTask#4050
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abbshr wants to merge 1 commit intohyperium:masterfrom
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fix(h2): return Poll::Pending when poll_capacity is not ready in UpgradedSendStreamTask#4050abbshr wants to merge 1 commit intohyperium:masterfrom
abbshr wants to merge 1 commit intohyperium:masterfrom
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…adedSendStreamTask Fix a backpressure bypass bug in UpgradedSendStreamTask::tick() where poll_capacity() returning Poll::Pending caused a 'break 'capacity' that fell through to rx.poll_next() -> send_data(), pushing data into the h2 send buffer without available capacity. This broke the HTTP/2 flow control chain, causing unbounded memory growth (OOM) when downstream consumers were slower than upstream producers. The fix changes 'break 'capacity' to 'return Poll::Pending', which correctly suspends the task until a WINDOW_UPDATE frame restores send capacity. The now-unused 'capacity label is also removed. This bug was introduced in hyper v1.8.0 (PR hyperium#3967) and affects v1.8.0, v1.8.1, and v1.9.0. A single HTTP/2 CONNECT tunnel with asymmetric upstream/downstream speeds could trigger OOM within seconds. Add four integration tests covering H2 CONNECT backpressure scenarios: - h2_connect_backpressure_respected: small window + large data transfer - h2_connect_zero_window_then_release: normal path regression guard - h2_connect_reset_during_backpressure: RST_STREAM error propagation - h2_connect_backpressure_bidirectional: bidirectional data + backpressure
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Fix #4049
Fix a backpressure bypass bug in UpgradedSendStreamTask::tick() where poll_capacity() returning Poll::Pending caused a 'break 'capacity' that fell through to rx.poll_next() -> send_data(), pushing data into the h2 send buffer without available capacity. This broke the HTTP/2 flow control chain, causing unbounded memory growth (OOM) when downstream consumers were slower than upstream producers.
The fix changes 'break 'capacity' to 'return Poll::Pending', which correctly suspends the task until a WINDOW_UPDATE frame restores send capacity. The now-unused 'capacity label is also removed.
This bug was introduced in hyper v1.8.0 (PR #3967) and affects v1.8.0, v1.8.1, and v1.9.0. A single HTTP/2 CONNECT tunnel with asymmetric upstream/downstream speeds could trigger OOM within seconds.
Add four integration tests covering H2 CONNECT backpressure scenarios: