Re: #13633: testwsdeque failure on POWER8

#13633: testwsdeque failure on POWER8
-------------------------------------+-------------------------------------
        Reporter:  trommler          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Runtime System    |              Version:  8.1
      Resolution:                    |             Keywords:  SMP, ci-
                                     |  breakage
Operating System:  Linux             |         Architecture:  powerpc64
 Type of failure:  Runtime crash     |            Test Case:
                                     |  rts/testwsdeque
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * keywords:  SMP => SMP, ci-breakage


Comment:

 I'm experiencing nondeterministic CI failures on `validate-x86_64-linux-
 deb9-unreg` due to `testwsdeque` unexpectedly //passing//, such as in
 [https://ghc-
 gitlab.s3.amazonaws.com/6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b/2019_02_24/34837/53901/job.log
 ?response-content-type=text/plain%3B%20charset%3Dutf-8&response-content-
 disposition=inline&X-Amz-Expires=600&X-Amz-Date=20190224T124346Z&X-Amz-
 Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAI3NPPHETCY4XXTOA/20190224
 /us-east-1/s3/aws4_request&X-Amz-SignedHeaders=host&X-Amz-
 Signature=71a51fa4b45493ac04249e2217478068a6cb4580a6367c6080d63c262bb3c9f1
 this run]:

 {{{
 *** unexpected pass for testwsdeque(threaded1)

 <elided>

 Unexpected results from:
 TEST="testwsdeque"

 SUMMARY for test run started at Sun Feb 24 09:28:06 2019 UTC
  0:42:51 spent to go through
     6844 total tests, which gave rise to
    21127 test cases, of which
    14004 were skipped

       38 had missing libraries
     6984 expected passes
      100 expected failures

        0 caused framework failures
        0 caused framework warnings
        1 unexpected passes
        0 unexpected failures
        0 unexpected stat failures

 Unexpected passes:
    rts/testwsdeque.run  testwsdeque [unexpected] (threaded1)
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13633#comment:4>