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x/playground: Deadlock running context timeout on play.golang.org #41534

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xeoncross opened this issue Sep 21, 2020 · 1 comment
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x/playground: Deadlock running context timeout on play.golang.org #41534

xeoncross opened this issue Sep 21, 2020 · 1 comment
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@xeoncross
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xeoncross commented Sep 21, 2020 •
edited

The following context timeout deadlocks on play.golang.org but works fine using several recent versions of the Go compiler.

https://play.golang.org/p/7vqNz9WXa6o

ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond)
defer cancel()

<-ctx.Done()	
err := ctx.Err()

What did you expect to see?

net.Error: context.deadlineExceededError

What did you see instead?

timeout running program

Update Looks like #39016 is related. If we remove the dependency on "net" then the deadlock seems to resolve.

https://play.golang.org/p/NM3xC6_R1_Q
@cagedmantis cagedmantis changed the title Deadlock running context timeout on play.golang.org x/playground: Deadlock running context timeout on play.golang.org Sep 22, 2020
@gopherbot gopherbot added this to the Unreleased milestone Sep 22, 2020
@cagedmantis
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@xeoncross This does seem similar to the bug reported in #39016. I'm going to close this issue since it seems to be a duplicate issue. Would you mind adding the sample case and description to the previous issue?

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