[Webkit-unassigned] [Bug 129429] New: [Win32][LLINT] Crash when running JSC stress tests.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129429

           Summary: [Win32][LLINT] Crash when running JSC stress tests.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: peavo at outlook.com


I'm currently getting a crash when running the JSC stress tests.
This is caused by accessing uncommitted stack memory.
This happens when we move the stack pointer by a value larger than the Windows stack guard page size (4K).
The system does not get the chance to move the guard page then, because we are not doing any stack reading or writing in between.
The stack guard page is the barrier between committed and uncommitted stack memory on Windows.
When someone tries to read or write to the guard page, the system commits that memory, and moves the guard page.

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