> [JDK-8342075](https://bugs.openjdk.org/browse/JDK-8342075) has introduced > more flow controls checks, but also introduced a race condition where > DataFrames for closed streams may fail to be discounted from the connection > window. > > The consequence is that WINDOW_UPDATE frames for the connection window may > not be sent when they should, preventing the server from making progress and > stalling the connection. > > This can be shown by modifying the StreamFlowControlTest to send less but > bigger frames (e.g. chunks of 1600 bytes instead of chunks of 12 bytes). With > such a modification the test can be seen failing intermittently, when > sameClient=true. > > The race happens when frames that have been added to Stream::inputQ fail to > be drained after the stream is closed (or continue to be added to the inputQ > after the stream is closed). > > The fix ensures that Stream::drainInputQueue() is called when the stream is > closed, and that no further data farme will be added to the inputQ after the > stream is marked closed. > > The modified StreamFlowControlTest could be observed failing relatively > frequently on linux-aarch64 without the fix. > With the fix the test no longer fails.
Daniel Fuchs has updated the pull request incrementally with one additional commit since the last revision: Add more comments ------------- Changes: - all: https://git.openjdk.org/jdk/pull/21991/files - new: https://git.openjdk.org/jdk/pull/21991/files/318b1811..9d21e58f Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=21991&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21991&range=00-01 Stats: 23 lines in 1 file changed: 21 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/21991.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21991/head:pull/21991 PR: https://git.openjdk.org/jdk/pull/21991
