testwsdeque failure on POWER8

On a POWER8 testwsdeque fails occasionally under load:

Wrong exit code for testwsdeque(threaded1)(expected 0 , actual 134 )
Stderr ( testwsdeque ):
internal error: FAIL: 277808608 3 13
    (GHC version 8.3.20170430 for powerpc64le_unknown_linux)

Trac metadata

Trac field	Value
Version	8.1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Runtime System
Test case
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Related
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CC	erikd, hvr, simonmar
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testwsdeque failure on POWER8