Bug 176754 – Crash in WebCore::AXObjectCache::performDeferredCacheUpdate

• Status: NEW
• Component: Accessibility

[Michael Catanzaro]

Unfortunately this backtrace is horrible and probably not going to be useful at all for fixing the bug, but we have a crash somewhere in 
WebCore::AXObjectCache::performDeferredCacheUpdate detected on the GTK release bot when running layout test imported/w3c/web-platform-tests/html/syntax/parsing/html5lib_tests9.html. I'm not going to add a crash expectation because the test has only ever crashed once:

Thread 1 (Thread 0x7f08fef49a80 (LWP 16077)):
#0  0x00007f090f783544 in _ZN7WebCore13AXObjectCache26performDeferredCacheUpdateEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#1  0x00007f090fc9d874 in _ZN7WebCore9FrameView6layoutEb () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#2  0x00007f090fd4b5aa in _ZN7WebCore12ThreadTimers24sharedTimerFiredInternalEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#3  0x00007f090d17faaa in _ZZN3WTF7RunLoop9TimerBaseC4ERS0_ENUlPvE_4_FUNES3_ () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#4  0x00007f090a73d5ca in g_main_dispatch () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:3212
#5  g_main_context_dispatch () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:3865
#6  0x00007f090a73d948 in g_main_context_iterate () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:3938
#7  0x00007f090a73dc62 in g_main_loop_run () at /home/slave/webkitgtk/gtk-linux-64-release-tests/build/WebKitBuild/DependenciesGTK/Source/glib-2.52.1/glib/gmain.c:4134
#8  0x00007f090d17fea0 in _ZN3WTF7RunLoop3runEv () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libjavascriptcoregtk-4.0.so.18
#9  0x00007f090f6639f2 in _ZN6WebKit16ChildProcessMainINS_10WebProcessENS_14WebProcessMainEEEiiPPc () from /home/slave/webkitgtk/gtk-linux-64-release/build/WebKitBuild/Release/lib/libwebkit2gtk-4.0.so.37
#10 0x00007f09063192b1 in __libc_start_main (main=0x7f0911c90d20 <main>, argc=2, argv=0x7ffe21175f08, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffe21175ef8) at ../csu/libc-start.c:291
#11 0x00007f0911c90daa in _start ()

[Radar WebKit Bug Importer]

<rdar://problem/34379940>