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Fix Http2 deadlock #99889

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merged 3 commits into from
Mar 21, 2024
Merged

Fix Http2 deadlock #99889

merged 3 commits into from
Mar 21, 2024

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MihaZupan
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Fixes #98945

The product change is just dropping the lock on Http2Connection.GetIdleTicks that's called by the connection pool while holding the pool lock. The lock isn't actually needed here as the race condition exists even with the lock, and should be harmless either way.

Also added a bunch more asserts to make introducing similar issues in the future a bit harder.

Tested on a repro project with artificial delays inside System.Net.Http.

We should consider backporting this one to 8.0.

@MihaZupan MihaZupan added this to the 9.0.0 milestone Mar 18, 2024
@MihaZupan MihaZupan requested a review from a team March 18, 2024 09:36
@MihaZupan MihaZupan self-assigned this Mar 18, 2024
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@MihaZupan
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/azp run runtime-libraries-coreclr outerloop

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Azure Pipelines successfully started running 1 pipeline(s).

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@wfurt wfurt left a comment

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LGTM

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@CarnaViire CarnaViire left a comment

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LGTM

@MihaZupan MihaZupan merged commit 9b8b01b into dotnet:main Mar 21, 2024
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@MihaZupan
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/backport to release/8.0-staging

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Started backporting to release/8.0-staging: https://github.com/dotnet/runtime/actions/runs/8378465640

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HttpClient getting deadlocked on InvalidateHttp2Connection
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