[GHC] #9771: Excessive memory usage compiling T3064

[GHC]

#9771: Excessive memory usage compiling T3064
-------------------------------------+-------------------------------------
       Reporter:  hvr                |                   Owner:  simonpj
           Type:  bug                |                  Status:  new
       Priority:  highest            |               Milestone:  7.10.1
      Component:  Compiler           |                 Version:  7.9
       Keywords:                     |        Operating System:
   Architecture:  Unknown/Multiple   |  Unknown/Multiple
     Difficulty:  Unknown            |         Type of failure:  Compile-
     Blocked By:                     |  time performance bug
Related Tickets:                     |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
 With 64dc4d1085a7db375f6532362bf7e23fac3a25eb the testsuite suffers from
 T3064 allocating an excessive amount of memory (several GiBs) and finally
 getting killed due to timeout and/or out-of-memory.

 {{{
 =====> T3064(normal) 3054 of 4150 [0, 0, 0]
 cd ./perf/compiler && '/home/hvr/ghc/inplace/bin/ghc-stage2' -fforce-
 recomp -dno-debug-output -no-user-package-db -rtsopts -fno-warn-tabs -fno-
 ghci-history -c T3064.hs   +RTS -V0 -tT3064.comp.stats --machine-readable
 -RTS  >T3064.comp.stderr 2>&1
 Compile failed (status 35072) errors were:
 Killed

 Failed to find field:  peak_megabytes_allocated
 *** framework failure for T3064(normal) do_test exception
 Traceback (most recent call last):
   File "/home/hvr/ghc/testsuite/driver/testlib.py", line 793, in do_test
     result = func(*[name,way] + args)
   File "/home/hvr/ghc/testsuite/driver/testlib.py", line 995, in compile
     return do_compile( name, way, 0, '', [], extra_hc_opts )
   File "/home/hvr/ghc/testsuite/driver/testlib.py", line 1024, in
 do_compile
     result = simple_build( name, way, extra_hc_opts, should_fail, top_mod,
 0, 1, force, override_flags )
   File "/home/hvr/ghc/testsuite/driver/testlib.py", line 1262, in
 simple_build
     statsResult = checkStats(name, way, stats_file,
 opts.compiler_stats_range_fields)
   File "/home/hvr/ghc/testsuite/driver/testlib.py", line 1136, in
 checkStats
     val = int(m.group(1))
 AttributeError: 'NoneType' object has no attribute 'group'

 OVERALL SUMMARY for test run started at Wed Nov  5 08:29:10 2014 CET
  0:04:14 spent to go through
     4150 total tests, which gave rise to
    16187 test cases, of which
    16186 were skipped

        0 had missing libraries
        0 expected passes
        0 expected failures

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

 make[1]: Leaving directory '/home/hvr/ghc/testsuite/tests'

 real    4m13.317s
 user    3m49.476s
 sys     0m5.831s
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9771>
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