[release/5.0] Split lock to prevent deadlock in Http2Stream. #47921
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Http2Connection.ChangeInitialWindowSize locks connection's SyncObject and calls Http2Stream.OnWindowUpdate which locks stream's SyncObject. Http2Stream.Complete is called only while stream's SyncObject lock is take and then it calls Http2Connection.RemoveStream that locks connection SyncObject.
…andler/Http2Stream.cs Co-authored-by: Stephen Toub <stoub@microsoft.com>
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@Anipik this was approved in email. Can we merge? |
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Backport of #47769 to release/5.0
Fixes #48220
Deadlock within HTTP/2.
/cc @ManickaP
Customer Impact
Reported by Notification Hubs Azure team after an upgrade to .NET 5.0
Regression?
Based on code investigation it has been present in .NET Core 3.1.
However, the customer didn't observer the problem on .NET Core 3.1. This might be due to the fact they had much lower load before moving to .NET 5.0.
Testing
Risk
Low