[Webkit-unassigned] [Bug 86918] New: DFG CFG simplification crashes if it's trying to remove an unreachable block that has an already-killed-off unreachable successor

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86918

           Summary: DFG CFG simplification crashes if it's trying to
                    remove an unreachable block that has an
                    already-killed-off unreachable successor
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


We kill off unreachable blocks in arbitrary order. Therefore if there is a network of unreachable blocks, we may try to do unreachable-successor fix-up when the successor has already been deleted. Then we crash.

This is hit by:

inspector/styles/styles-computed-trace.html
inspector/console/console-big-array.html

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