[GHC] #10368: Armhf/Linux : test T7815 failing

[GHC]

#10368: Armhf/Linux : test T7815 failing
-------------------------------------+-------------------------------------
              Reporter:  erikd       |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:  7.12.1
             Component:  Compiler    |           Version:  7.11
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:  arm         |   Type of failure:  Incorrect result
             Test Case:              |  at runtime
              Blocking:              |        Blocked By:
Differential Revisions:              |   Related Tickets:
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 During validation on armhf/linux, I found this test had failed.


 Unfortunately, it only fails intermittently on one quad core Arm board and
 not at all on another quad core Arm board. If I do 10 runs of the test
 like:

 {{{
 for x in $(seq 1 10) ; do testsuite/tests/rts/T7815 50000 +RTS -N2 ; echo
 $? ; done
 }}}

 one will fail at least 4 or 5 times and ocassionally as many as 9 or 10
 times.

 The two boards are:

 * Inforce Computing ifc6540 with a Qualcomm Snapdragon 805 CPU.
 * Radxa Rock with a Rockchip RK3199 CPU.

 The ifc6540 is the one that fails.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10368>
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