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ember-server hanging on cancellation

See original GitHub issue

Running into this in https://github.com/http4s/http4s-jdk-http-client/pull/645.

I extracted the test into a scala-cli runnable IOApp and did a fiber dump. They are both here: https://gist.github.com/armanbilge/ec958260fc4bd0fed34e86c8c5091035

The fiber dump seems to indicate a hang here:

cats.effect.IOFiber@5f03cbbf WAITING
 ├ delay @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.$anonfun$readChunk$1(SocketPlatform.scala:123)
 ├ async @ fs2.io.net.SocketCompanionPlatform$AsyncSocket.readChunk(SocketPlatform.scala:117)
 ├ flatMap @ fs2.io.net.SocketCompanionPlatform$BufferedReads.$anonfun$read$1(SocketPlatform.scala:85)
 ├ delay @ fs2.io.net.SocketCompanionPlatform$BufferedReads.$anonfun$withReadBuffer$1(SocketPlatform.scala:54)
 ├ release @ org.http4s.jdkhttpclient.CompletableFutureTerminationApp$.stallingServerR(bug.scala:182)
 ├ release @ org.http4s.jdkhttpclient.CompletableFutureTerminationApp$.stallingServerR(bug.scala:182)
 ├ release @ org.http4s.jdkhttpclient.CompletableFutureTerminationApp$.stallingServerR(bug.scala:182)
 ╰ apply @ org.http4s.jdkhttpclient.CompletableFutureTerminationApp$.run(bug.scala:70)

However, in an ember-client cancellation bug the fiber dump also pointed us to that exact same line, but it was a red herring. See:

https://github.com/http4s/http4s/issues/6058#issuecomment-1043299750

Issue Analytics

State:
Created a year ago
Reactions:2
Comments:8 (8 by maintainers)

Top GitHub Comments

1reaction

armanbilgecommented, Aug 15, 2022

Note that the websocket bug from https://github.com/http4s/http4s/issues/6420#issuecomment-1138864091 was fixed in https://github.com/http4s/http4s/pull/6587.

0reactions

armanbilgecommented, Nov 6, 2022

I also fixed this by adding withShutdownTimeout(1.second) as well.

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