[Webkit-unassigned] [Bug 146399] New: AX: iOS: Crash at accessibilityObjectForMainFramePlugin()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146399

            Bug ID: 146399
           Summary: AX: iOS: Crash at
                    accessibilityObjectForMainFramePlugin()
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cfleizach at apple.com
                CC: webkit-bug-importer at group.apple.com

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x00000018
Triggered by Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed ↩:
0   WebKit                            0x2bef7704 WebKit::WebPage::accessibilityObjectForMainFramePlugin() + 4 (memory:2644)
1   WebKit                            0x2bf74a46 -[WKAccessibilityWebPageObjectBase accessibilityRootObjectWrapper] + 42 (WKAccessibilityWebPageObjectBase.mm:57)
2   Foundation                        0x27ddec20 -[NSObject(NSKeyValueCoding) valueForKey:] + 220 (NSKeyValueCoding.m:380)
3   AccessibilityUtilities            0x2c4cb8ea __57-[NSObject(UIAccessibilitySafeCategory) safeValueForKey:]_block_invoke + 26 (AXSafeValue.m:288)
4   AccessibilityUtilities            0x2c4cbd24 -[NSObject(UIAccessibilitySafeCategory) _accessibilityPerformSafeValueKeyBlock:withKey:onClass:] + 84 (AXSafeValue.m:341)
5   AccessibilityUtilities            0x2c4cb5f2 -[NSObject(UIAccessibilitySafeCategory) safeValueForKey:] + 230 (AXSafeValue.m:287)
6   WebProcess                        0x252d7dae -[WKAccessibilityWebPageObjectAccessibility _initializeRootIfNecessary] + 30 (WKAccessibilityWebPageObjectAccessibility.m:141)
7   WebProcess                        0x252d7b6e -[WKAccessibilityWebPageObjectAccessibility accessibilityHitTest:] + 26 (WKAccessibilityWebPageObjectAccessibility.m:80)
8   WebProcess                        0x252d8bae -[WKNSObjectAccessibility accessibilityHitTest:] + 234 (NSObject+AXWebProcess.m:33)
9   AXRuntime                         0x2c3de9c6 _copyElementAtPositionCallback + 126 (AXSimpleRuntimeManager.m:114)
10  AXRuntime                         0x2c3e53fa _AXXMIGCopyElementAtPosition + 178 (AccessibilityPriv.m:1129)


<rdar://problem/19604231>

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