New space leak?

[Simon Marlow]

My validate has a few perf failures (below).  Now I know that sampling heap
size is inaccurate, but the evidence here is pretty strong. Also validate
fell over completely in my 2GB VM when Haddock ran out of memory, I had to
give it more memory to complete.  Something has got worse recently - this
wasn't happening a couple of weeks ago.

Does anyone have any idea what might have caused this?  Going back in time
is difficult.  Are these failures happening for other people?

Let me suggest something that might help with these perf tests: running the
program with +RTS -h -i0.01 will give a more accurate indication of peak
residency, by running major GCs much more often.  Also you get a heap
profile.

Cheers,
Simon

=====> haddock.base(normal) 2474 of 3806 [0, 1, 0]
max_bytes_used value is too high:
    Expected    max_bytes_used:  96022312 +/-10%
    Lower bound max_bytes_used:  86420080
    Upper bound max_bytes_used: 105624544
    Actual      max_bytes_used: 113537216
peak_megabytes_allocated value is too high:
    Expected    peak_megabytes_allocated: 274 +/-10%
    Lower bound peak_megabytes_allocated: 246
    Upper bound peak_megabytes_allocated: 302
    Actual      peak_megabytes_allocated: 323
*** unexpected failure for haddock.base(normal)
=====> haddock.Cabal(normal) 2475 of 3806 [0, 2, 0]
=====> haddock.compiler(normal) 2476 of 3806 [0, 2, 0]
peak_megabytes_allocated value is too high:
    Expected    peak_megabytes_allocated: 1250 +/-10%
    Lower bound peak_megabytes_allocated: 1125
    Upper bound peak_megabytes_allocated: 1375
    Actual      peak_megabytes_allocated: 1397
bytes allocated value is too high:
    Expected    bytes allocated: 25990254632 +/-10%
    Lower bound bytes allocated: 23391229168
    Upper bound bytes allocated: 28589280096
    Actual      bytes allocated: 28680445952
*** unexpected failure for haddock.compiler(normal)
=====> T3064(normal) 2480 of 3806 [0, 3, 0]
cd ./perf/compiler && '/home/smarlow/ghc/bindisttest/install   dir/bin/ghc'
-fforce-recomp -dno-debug-output -no-user-package-db -rtsopts
-fno-ghci-history -c T3064.hs   +RTS -V0 -tT3064.comp.stats
--machine-readable -RTS  >T3064.comp.stderr 2>&1
max_bytes_used value is too high:
    Expected    max_bytes_used: 12000480 +/-20%
    Lower bound max_bytes_used:  9600384
    Upper bound max_bytes_used: 14400576
    Actual      max_bytes_used: 15258696
peak_megabytes_allocated value is too high:
    Expected    peak_megabytes_allocated: 30 +/-20%
    Lower bound peak_megabytes_allocated: 24
    Upper bound peak_megabytes_allocated: 36
    Actual      peak_megabytes_allocated: 37
*** unexpected failure for T3064(normal)
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