[Webkit-unassigned] [Bug 106768] New: m_initiatorMap has keys for already deleted CachedResources.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106768

           Summary: m_initiatorMap has keys for already deleted
                    CachedResources.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: loislo at chromium.org
                CC: japhet at chromium.org, simonjam at chromium.org,
                    vsevik at chromium.org


I fixed instrumentation for CachedResourceLoader (added m_initiatorMap in reportMemoryUsage method)
As a result I got a crash in inspector-protocol/nmi-webaudio-leak-test.html layout test.
It happened because Native Memory profiler iterates through instrumented objects members
and all container values. In the current case it iterates through the keys
in m_initiatorMap  and visits them. Looks like the lifetime of the map doesn't
correlates with the lifetime of the CachedResources.

Usually it crashes when profiler visits a document from a previous test.
It happens almost always because DRT doesn't forces GC between tests.

https://bugs.webkit.org/attachment.cgi?id=182522&action=review

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