Excessive memory usage compiling T3064

With 64dc4d10 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

Trac metadata

Trac field	Value
Version	7.9
Type	Bug
TypeOfFailure	OtherFailure
Priority	highest
Resolution	Unresolved
Component	Compiler
Test case
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