[GHC] #15241: Validate failures in sanity way

[GHC]

#15241: Validate failures in sanity way
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        Reporter:  osa1              |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Runtime System    |              Version:  8.5
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14915, #15906    |  Differential Rev(s):  Phab:D4839
       Wiki Page:                    |
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Comment (by osa1):

 Looking at the results again

 - `T7919`: Timeout, but passes if I wait long enough (a few hours).
 - `memo001`: Timeout, but passes if I wait long enough.
 - `hpc_raytrace`: Timeout, but passes if I wait long enough.
 - `heap_all`: An actual bug, but probably in the `ghc-heap` library.
 - `length001`: Stack overflow. The test requires `-O` which is not passed
 in sanity way. If I add `-O` this passes.

 So I think we're in a good shape. We just need to tweak tests a little
 bit.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15241#comment:16>
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