[Webkit-unassigned] [Bug 189950] New: REGRESSION: [ iOS ] Layout Test accessibility/mac/footer-roledescription.html is Crashing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189950

            Bug ID: 189950
           Summary: REGRESSION: [ iOS ] Layout Test
                    accessibility/mac/footer-roledescription.html is
                    Crashing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tsavell at apple.com
                CC: lforschler at apple.com

The following layout test is Crashing on iOS

accessibility/mac/footer-roledescription.html

Probable cause:

Test is newly crashing. Earliest failure logged in history is r236451. I have been unable to reproduce yet. 

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=accessibility%2Fmac%2Ffooter-roledescription.html

Crash Log:
https://build.webkit.org/results/Apple%20High%20Sierra%20Debug%20WK2%20(Tests)/r236455%20(4969)/accessibility/mac/footer-roledescription-crash-log.txt

Excerpt:
Application Specific Information:
CRASHING TEST: accessibility/mac/focus-moves-cursor.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore            0x0000000540a43160 WTFCrash + 16 (Assertions.cpp:255)
1   com.apple.WebCore                   0x000000053000b13b WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore                   0x00000005339c0f61 textMarkerForVisiblePosition(WebCore::AXObjectCache*, WebCore::VisiblePosition const&) + 97 (WebAccessibilityObjectWrapperMac.mm:711)
3   com.apple.WebCore                   0x00000005339c23b1 textMarkerRangeFromVisiblePositions(WebCore::AXObjectCache*, WebCore::VisiblePosition const&, WebCore::VisiblePosition const&) + 33 (WebAccessibilityObjectWrapperMac.mm:1110)
4   com.apple.WebCore                   0x00000005339c2386 -[WebAccessibilityObjectWrapper textMarkerRangeFromVisiblePositions:endPosition:] + 70 (WebAccessibilityObjectWrapperMac.mm:1117)
5   com.apple.WebCore                   0x000000053037e4b6 WebCore::AXObjectCache::postTextStateChangePlatformNotification(WebCore::AccessibilityObject*,

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