[GHC] #15064: T8089 mysteriously fails when GHC is built with LLVM

[GHC]

#15064: T8089 mysteriously fails when GHC is built with LLVM
-------------------------------------+-------------------------------------
           Reporter:  bgamari        |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.2.2
  (LLVM)                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 CircleCI's LLVM build revealed that `T8089` fails. The test is quite
 simple,
 {{{#!hs
 main = threadDelay maxBound
 }}}
 and is expected to timeout. However, it somehow exits with code 0 in all
 ways when built with LLVM.

 This didn't reproduce when I tried `make test TEST=T8089
 EXTRA_HC_OPTS=-fllvm` locally, so either it's a library issue or
 environment-sensitive.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15064>
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