[GHC] #16193: Nondeterministic T15897 timeout failures

[GHC]

#16193: Nondeterministic T15897 timeout failures
-------------------------------------+-------------------------------------
           Reporter:  RyanGlScott    |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:
          Component:  Test Suite     |           Version:  8.7
           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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 I'm noticing sporadic test failures for `T15897`. Here is [https://ghc-
 gitlab.s3.amazonaws.com/43/4c/434c9b5ae514646bbd91b50032ca579efec8f22bf0b4aac12e65997c418e0dd6/2019_01_16/12262/16763/job.log
 ?response-content-type=text/plain%3B%20charset%3Dutf-8&response-content-
 disposition=inline&X-Amz-Expires=600&X-Amz-Date=20190116T140554Z&X-Amz-
 Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAI3NPPHETCY4XXTOA/20190116
 /us-east-1/s3/aws4_request&X-Amz-SignedHeaders=host&X-Amz-
 Signature=a8e95f4ef77f5dc5fd38a8ee4f4ccdbb25c1671f8be3b767de21004a2dd407a8
 one recent example]:

 {{{
 Wrong exit code for T15897()(expected 0 , actual 99 )
 *** unexpected failure for T15897(profasm)
 }}}

 This was on the `validate-x86_64-linux-deb9-unreg` CI configuration,
 although it's unclear to me if the problem is exclusive to that
 configuration or not.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16193>
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