[Webkit-unassigned] [Bug 172850] New: AX: AXObjectcache

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172850

            Bug ID: 172850
           Summary: AX: AXObjectcache
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msching at 163.com
                CC: webkit-bug-importer at group.apple.com

I has a hybrid app, use WebView as front end. Recently, some users mailed me to report a crash. They said that app crashed when any button clicked in newly released 10.12.6 beta.

There is the crash report send by users.

Date/Time:             2017-06-01 17:17:15.893 +0900
OS Version:            Mac OS X 10.12.6 (16G8c)
Report Version:        12
Anonymous UUID:        37EA04A4-BB23-7B96-C868-4BAE97344563

Sleep/Wake UUID:       8224680D-404B-4647-9B02-39C543C7A7CB

Time Awake Since Boot: 1200 seconds
Time Since Wake:       1000 seconds



System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       EXC_I386_GPFLT
Exception Note:        EXC_CORPSE_NOTIFY

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore             0x00007fffbaa0d14c WebCore::AXObjectCache::getOrCreate(WebCore::RenderObject*) + 1532
1   com.apple.WebCore             0x00007fffbaa155d9 WebCore::AXObjectCache::performDeferredCacheUpdate() + 105
2   com.apple.WebCore             0x00007fffba79c2d2 WebCore::FrameView::performPostLayoutTasks() + 562
3   com.apple.WebCore             0x00007fffba792c61 WebCore::FrameView::layout(bool) + 4017
4   com.apple.WebCore             0x00007fffba791b59 WebCore::FrameView::updateLayoutAndStyleIfNeededRecursive() + 153
5   com.apple.WebKitLegacy        
0x00007fffbbb11c98 LayerFlushController::flushLayers() + 72
6   com.apple.WebCore             0x00007fffbb3496ac WebCore::LayerFlushScheduler::layerFlushCallback() + 28
7   com.apple.WebKitLegacy        
0x00007fffbbc20c08 WebViewLayerFlushScheduler::layerFlushCallback() + 24
8   com.apple.CoreFoundation      
0x00007fffb39a1d37 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
9   com.apple.CoreFoundation      
0x00007fffb39a1ca7 __CFRunLoopDoObservers + 391
10  com.apple.CoreFoundation      
0x00007fffb3982136 CFRunLoopRunSpecific + 454
11  com.apple.HIToolbox           0x00007fffb2ee2ebc RunCurrentEventLoopInMode + 240
12  com.apple.HIToolbox           0x00007fffb2ee2bf9 ReceiveNextEventCommon + 184
13  com.apple.HIToolbox           0x00007fffb2ee2b26 _BlockUntilNextEventMatchingListInModeWithFilter + 71
14  com.apple.AppKit              
0x00007fffb147ba54 _DPSNextEvent + 1120
15  com.apple.AppKit              
0x00007fffb1bf77ee -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 2796
16  com.apple.AppKit              
0x00007fffb14703db -[NSApplication run] + 926
17  com.apple.AppKit              
0x00007fffb143ae0e NSApplicationMain + 1237
18  libdyld.dylib                 0x00007fffc90fd235 start + 1

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