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I think that the bug 2724, fixed in ghc-6.10.x, has reappeared in ghc-7.0.1. When I run hmatrix tests I get the same kind of random errors, which disappear if I insert the asm finit call. I don't have a small test case without dependencies, but I hope that this problem can be easily reproduced as follows:

$ cabal update
$ cabal unpack hmatrix
$ cd hmatrix-0.11.0.0
$ cabal install [-f-vector] [-f-binary]

(these flags can be given to minimize dependencies)

$ cabal test

All tests must pass. Now we will try to produce the error:

Comment out line 172 of hmatrix.cabal to remove the workaround for ghc-7.0.1:

-       cpp-options: -DFINIT
+    -- cpp-options: -DFINIT

$ cabal clean
$ cabal install [-f-vector] [-f-binary]
$ cabal test

Now we will probably get several errors.

Please let me know if you need more information. I hope I have not made some big mistake.

Trac metadata

Trac field	Value
Version	7.0.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (NCG)
Test case
Differential revisions
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Blocking
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Operating system
Architecture