#6041: Program hangs when run under Ubuntu Precise
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Reporter: dsf | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Linux | Architecture: Unknown/Multiple
Failure: Runtime crash | Testcase:
Blockedby: | Blocking:
Related: |
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This code hangs when running under Ubuntu Precise. However, it works in a
Precise changeroot on an Ubuntu Lucid machine -- indicating it could be
kernel specific. My guess would be that it would succeed on a Precise
machine running a Lucid kernel, but we have not tried that.
Any of the following changes make the code work:
1. replacing 'readTVar u' with 'return ()'
2. removing the 'Wrapper' monad and just using 'StateT'
3. deriving the 'MonadState' instance instead of righting it by hand
4. copying the definition of 'modify' into the local module and use that
instead of the imported version
The final mystery: If the binary is built in a precise changeroot (where
it works) and then copied to a precise machine ... it still works. And if
it is built on a real precise machine, where it fails, it still fails when
copied to a precise changeroot on a lucid machine.
So, there's that.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6041>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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