[Webkit-unassigned] [Bug 187157] New: IsoCellSet::sweepToFreeList() not safe when Full GC in process

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187157

            Bug ID: 187157
           Summary: IsoCellSet::sweepToFreeList() not safe when Full GC in
                    process
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

If we are in the process of a full GC and we call into IsoCellSet::sweepToFreeList(), the IsoCellSet's bits may be improperly cleared due to incomplete stale marks logic.  The stale marks logic needs to match what is in MarkedBlock::Handle::specializedSweep where it takes into account whether or not we are in the process of marking during a full GC.

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