Testsuite failures on Windows

For some time now there have been quite a few testsuite failures on Windows, but that number seems to have increaded recently. Here are the failures from

sh validate --fast

with today's HEAD

SUMMARY for test run started at Mon Apr 30 16:41:18 2018 GMTST
 5:46:04 spent to go through
    6321 total tests, which gave rise to
   18197 test cases, of which
   11980 were skipped

      46 had missing libraries
    5963 expected passes
     171 expected failures

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

Unexpected failures:
   backpack/cabal/bkpcabal07/bkpcabal07.run           bkpcabal07 [bad exit code] (normal)
   backpack/cabal/bkpcabal06/bkpcabal06.run           bkpcabal06 [bad exit code] (normal)
   cabal/ghcpkg05.run                                 ghcpkg05 [bad stderr] (normal)
   ghci/linking/ghcilink001.run                       ghcilink001 [bad exit code] (normal)
   ghci/linking/ghcilink004.run                       ghcilink004 [bad exit code] (normal)
   ghci/linking/dyn/big-obj.run                       big-obj [bad exit code] (normal)
   ghci/scripts/ghci057.run                           ghci057 [bad stdout] (ghci)
   ghci/scripts/T9293.run                             T9293 [bad stdout] (ghci)
   ghci.debugger/scripts/break006.run                 break006 [bad stdout] (ghci)
   ghci.debugger/scripts/hist001.run                  hist001 [bad stdout] (ghci)
   ghci.debugger/scripts/hist002.run                  hist002 [bad stdout] (ghci)
   perf/compiler/T14697.run                           T14697 [[Errno 2] No such file or directory: '/c/Users/simonpj/AppData/Local/Temp/ghctest-4kcp39ag/test   spaces/./perf/compiler/T14697.run/T14697.comp.stats'] (normal)
   plugins/plugins07.run                              plugins07 [bad exit code] (normal)
   plugins/T10420.run                                 T10420 [bad exit code] (normal)
   plugins/T11244.run                                 T11244 [bad stderr] (normal)
   rts/T11788.run                                     T11788 [bad exit code] (normal)
   rts/T14695.run                                     T14695 [bad stderr] (normal)
   rts/T11223/T11223_simple_link.run                  T11223_simple_link [bad exit code] (normal)
   rts/T11223/T11223_simple_link_lib.run              T11223_simple_link_lib [bad exit code] (normal)
   rts/T11223/T11223_simple_duplicate_lib.run         T11223_simple_duplicate_lib [bad exit code] (normal)
   rts/T11223/T11223_simple_unused_duplicate_lib.run  T11223_simple_unused_duplicate_lib [bad exit code] (normal)
   rts/T11223/T11223_link_order_a_b_succeed.run       T11223_link_order_a_b_succeed [bad exit code] (normal)
   rts/T11223/T11223_link_order_b_a_succeed.run       T11223_link_order_b_a_succeed [bad exit code] (normal)
   rts/T11223/T11223_link_order_a_b_2_fail.run        T11223_link_order_a_b_2_fail [bad exit code] (normal)
   rts/T11223/T11223_link_order_b_a_2_succeed.run     T11223_link_order_b_a_2_succeed [bad exit code] (normal)
   rts/T12771/T12771.run                              T12771 [bad exit code] (normal)
   rts/T13082/T13082_good.run                         T13082_good [bad exit code] (normal)
   rts/T14611/T14611.run                              T14611 [bad exit code] (normal)
   /../libraries/base/tests/tempfiles.run             tempfiles [bad stdout] (normal)
   /../libraries/process/tests/T9775/T9775_fail.run   T9775_fail [bad exit code] (normal)
   /../libraries/process/tests/T9775/T9775_good.run   T9775_good [bad exit code] (normal)

Unexpected stat failures:
   perf/compiler/T12234.run             T12234 [stat not good enough] (optasm)
   perf/compiler/T12425.run             T12425 [stat not good enough] (optasm)
   perf/compiler/T12150.run             T12150 [stat not good enough] (optasm)
   perf/should_run/T14052.run           T14052 [stat not good enough] (ghci)
   perf/should_run/T14936.run           T14936 [stat too good] (normal)
   perf/compiler/MultiLayerModules.run  MultiLayerModules [stat not good enough] (normal)

Framework failures:
   plugins/plugins07.run                             plugins07 [normal] (pre_cmd failed: 2)
   plugins/T10420.run                                T10420 [normal] (pre_cmd failed: 2)
   plugins/T11244.run                                T11244 [normal] (pre_cmd failed: 2)
   safeHaskell/check/pkg01/ImpSafeOnly08.run         ImpSafeOnly08 [runTest] (Unhandled exception during cleanup: Unable to remove folder '/c/Users/simonpj/AppData/Local/Temp/ghctest-4kcp39ag/test   spaces/./safeHaskell/check/pkg01/ImpSafeOnly08.run': [Errno 13] Permission denied: '/c/Users/simonpj/AppData/Local/Temp/ghctest-4kcp39ag/test   spaces/./safeHaskell/check/pkg01/ImpSafeOnly08.run/pdb.ImpSafeOnly08/install/x86_64-windows-ghc-8.5.20180420/safePkg01-1.0-LQOvw3iv9WM6fIcv695PaM'
Unable to start current test.)
   ../../libraries/process/tests/T9775/T9775_fail.run  T9775_fail [normal] (pre_cmd failed: 2)
   ../../libraries/process/tests/T9775/T9775_good.run  T9775_good [normal] (pre_cmd failed: 2)

Framework warnings:
   .  T13701 [numfield-no-expected] (No expected value found for bytes allocated in num_field check)

That's an uncomfortably long list.

Trac metadata

Trac field	Value
Version	8.2.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system	Unknown/Multiple
Architecture