[Webkit-unassigned] [Bug 59604] New: REGRESSION: r83938 abandons GC memory

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=59604

           Summary: REGRESSION: r83938 abandons GC memory
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.5
            Status: NEW
          Severity: Major
          Priority: P1
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: msaboff at apple.com


Created an attachment (id=91278)
 --> (https://bugs.webkit.org/attachment.cgi?id=91278&action=review)
Memory Test webpage

While running a memory test, the amount of dirty pages attributed to the garbage collector grows unbounded.  This is evident by the output of "vmmap -resident <pid>":

REGION TYPE             [ VIRTUAL/RESIDENT]
===========             [ =======/========]
ATS (font support)      [   31.8M/    424K]
CG backing stores       [   5140K/   5140K]
CG image                [     32K/     32K]
CG raster data          [   1176K/   1168K]
CG shared images        [   1972K/   1276K]
Carbon                  [   1728K/   1728K]
CoreGraphics            [    832K/    820K]
IOKit                   [  258.7M/   2652K]
JS JIT generated code   [    1.0G/   30.9M]
JS VM register file     [   4160K/     12K]
JS garbage collector    [   22.2M/   22.2M]
LayerKit                [   2380K/   1332K]
MALLOC                  [  206.1M/  193.4M]
Memory tag=242          [     12K/     12K]
Memory tag=251          [     28K/     28K]
Memory tag=69           [    160K/    160K]
OpenGL GLSL             [   2048K/   1144K]
STACK GUARD             [   56.1M/      0K]
Stack                   [   13.7M/    596K]
VM_ALLOCATE             [   16.5M/   16.5M]
__DATA                  [   17.0M/   12.1M]
__IMAGE                 [   1240K/    932K]
__LINKEDIT              [  116.0M/  103.2M]
__NV_CUDA               [      4K/      4K]
__TEXT                  [  169.4M/  129.9M]
__UNICODE               [    536K/    368K]
mapped file             [   37.2M/   15.7M]
shared memory           [    832K/    732K]

The memory test webpage is attached.

This revision was identified by building & testing Safari with r83938 and r83937.

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