#5421: <<loop>> in withMVar (reproducible, but with large test case)
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Reporter: JohnMillikin | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.2.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Incorrect result at runtime
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Comment(by JohnMillikin):
> Does the same happen if you run on just one core?
Changing the number of cores with {{{+RTS -N1}}}, {{{-N2}}}, etc seems to
have no effect.
> The scheduler switches threads, and I would have thought that it
blackholed the thunk at that moment (which would have led to a visible
<<loop>>, but apparently not
Does that mean it would {{{<<loop>>}}} when {{{forkIO}}} is called,
instead of within the thread? That's definitely better behavior if
possible, since it would make debugging much easier.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5421#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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