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Running process with input redirection hangs forever #10007

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scabug opened this issue Oct 25, 2016 · 2 comments
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Running process with input redirection hangs forever #10007

scabug opened this issue Oct 25, 2016 · 2 comments
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@scabug
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@scabug scabug commented Oct 25, 2016

This code works fine in 2.11.8 but hangs in 2.12.0-RC2:

import java.io._
import scala.sys.process._
("echo" #< new ByteArrayInputStream("lol\n".getBytes)).!!
@scabug
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@scabug scabug commented Oct 25, 2016

Imported From: https://issues.scala-lang.org/browse/SI-10007?orig=1
Reporter: @ghik
Affected Versions: 2.12.0-RC2
See #8768

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@scabug scabug commented Oct 26, 2016

@som-snytt said:
This commit changed SyncVar.set to SyncVar.put without regard to semantics.

scala/scala@67b3b9d

Trying to put twice without any takers will hang.

But kicking off threads in REPL without taking precautions is prone to deadlock, so that might contribute to how you observe the hang. For me, that started in 2.12.0-M2, when lambda switch was thrown, IIUC.

scala/scala#5481

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