[Webkit-unassigned] [Bug 185231] New: WebContent crash loading page on seas.upenn.edu @ JavaScriptCore: vmEntryToJavaScript

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185231

            Bug ID: 185231
           Summary: WebContent crash loading page on seas.upenn.edu @
                    JavaScriptCore: vmEntryToJavaScript
           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

1. On an iOS device, load https://www.seas.upenn.edu/~cis194/fall16/hw/01-intro.html.
2. Zoom in & out and scroll up & down randomly.  Should crash fairly easily.

The issue is that we are not invalidating the dataMemoryTemp and cachedMemoryTemp registers when we transition masm.m_allowScratchRegister.  These transitions happen in the classes AllowMacroScratchRegisterUsage, AllowMacroScratchRegisterUsageIf and DisallowMacroScratchRegisterUsage.

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