[Webkit-unassigned] [Bug 165962] New: REGRESSION: HipChat and Mail sometimes hang beneath JSC::Heap::lastChanceToFinalize()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=165962

            Bug ID: 165962
           Summary: REGRESSION: HipChat and Mail sometimes hang beneath
                    JSC::Heap::lastChanceToFinalize()
    Classification: Unclassified
           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

There is an inherent race when waiting on the condition variable and the timeout fires.  The waitFor() can timeout just before getting a notification from another thread.

AutomaticThread::start() uses a condition variable to wait for work from another thread.  The other thread waits for the machine thread to respond to the notification, but instead it goes to sleep since it doesn't see the notification.

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