#3279: Segmentation fault in reactive program
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Reporter: Baughn | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.11 | Severity: normal
Keywords: | Testcase:
Os: Unknown/Multiple | Architecture: x86_64 (amd64)
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Trying to debug reactive, I triggered what appears to be a GHC bug. To
clarify:
- Replacing "foo `unamb` bar `unamb` baz" with foldl1 unamb [foo,bar,baz]
in one particular function causes a segmentation fault at runtime, in all
possible permutations of -threaded/nonthreaded and GHC 6.10.3/6.11.
Further, a number of different changes do the same, quite unpredictably.
The hackage version of reactive does not exhibit this bug. I've attached a
quite minimal patch to it that causes this, as well as a test program to
trigger it.
I've been trying to debug this myself, with very little success. No level
of core-lint or debug checks causes this code to trigger assertions
instead of outright segfaults.
Incidentally, lazysmallcheck-0.3, a dependency of reactive, does not
compile against 6.11 due to a name change in the Data.Generics interface.
I've uploaded a fixed version to http://brage.info/~svein/lsc.tar.gz.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3279>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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