134316 2014-06-25 16:37:04 -0700 Crash in ScrollingTree::isRubberBandInProgress() 2014-06-25 17:51:59 -0700 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 bdakin bdakin andersca bdakin bunhere cdumez cmarcelo commit-queue ggaren gyuyoung.kim jamesr luiz sergio simon.fraser thorton tonikitoo oldest_to_newest 1018442 0 bdakin 2014-06-25 16:37:04 -0700 There is a crash in ScrollingTree::isRubberBandInProgress() that seems to indicate that the ScrollingNode's ScrollingTree pointer is null. This seems to be a race condition that can occur when tearing down a page. 3 libsystem_pthread.dylib: _pthread_mutex_check_init + 17 3 libsystem_pthread.dylib: _pthread_mutex_lock + 28 ==> 3 com.apple.WebCore: WebCore::ScrollingTree::isRubberBandInProgress + 22 <== 3 com.apple.WebCore: WebCore::ScrollingTreeScrollingNode::updateBeforeChildren + 58 3 com.apple.WebCore: WebCore::ScrollingTreeScrollingNodeMac::updateBeforeChildren + 24 3 com.apple.WebCore: WebCore::ScrollingTree::updateTreeFromStateNode + 541 3 com.apple.WebCore: WebCore::ScrollingTree::commitNewTreeState + 295 3 com.apple.WebCore: WebCore::ThreadedScrollingTree::commitNewTreeState + 29 3 com.apple.WebCore: WTF::FunctionWrapper<void + 57 3 com.apple.WebCore: WTF::BoundFunctionImpl<WTF::FunctionWrapper<void + 44 3 com.apple.WebCore: WebCore::ScrollingThread::dispatchFunctionsFromScrollingThread + 121 3 com.apple.WebCore: WebCore::ScrollingThread::threadRunLoopSourceCallback + 65 3 com.apple.CoreFoundation: <rdar://problem/16247911> 1018452 1 233853 bdakin 2014-06-25 17:07:57 -0700 Created attachment 233853 Patch 1018456 2 233853 ggaren 2014-06-25 17:20:36 -0700 Comment on attachment 233853 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=233853&action=review Am I allowed to review this? Maybe I am. > Source/WebCore/ChangeLog:13 > + believe that the ScrollingCoordinator’s ScrollingTree pointer had been null-ed out Squiggly apostrophe. > Source/WebCore/ChangeLog:16 > + creation back to the scrolling thread and to use the this pointer to create new For clarity, I think "scrolling thread" should be "scrolling tree" here. Node creation was always happening on the scrolling thread -- but it was using data from the scrolling coordinator, which was not thread-safe. > Source/WebCore/ChangeLog:17 > + nodes rather than the ScrollingCoordinator’s pointer. Squiggles. 1018464 3 bdakin 2014-06-25 17:51:59 -0700 Thank you! Fixed the thingies. http://trac.webkit.org/changeset/170451 233853 2014-06-25 17:07:57 -0700 2014-06-25 17:20:36 -0700 Patch for-review.txt text/plain 18948 bdakin SW5kZXg6IFNvdXJjZS9XZWJDb3JlL0NoYW5nZUxvZwo9PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Ci0tLSBTb3VyY2UvV2Vi Q29yZS9DaGFuZ2VMb2cJKHJldmlzaW9uIDE3MDQ0NykKKysrIFNvdXJjZS9XZWJDb3JlL0NoYW5n ZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDU3IEBACisyMDE0LTA2LTI1ICBCZXRoIERh a2luICA8YmRha2luQGFwcGxlLmNvbT4KKworICAgICAgICBDcmFzaCBpbiBTY3JvbGxpbmdUcmVl Ojppc1J1YmJlckJhbmRJblByb2dyZXNzKCkKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5v cmcvc2hvd19idWcuY2dpP2lkPTEzNDMxNgorICAgICAgICAtYW5kIGNvcnJlc3BvbmRpbmctCisg ICAgICAgIDxyZGFyOi8vcHJvYmxlbS8xNjI0NzkxMT4KKworICAgICAgICBSZXZpZXdlZCBieSBO T0JPRFkgKE9PUFMhKS4KKworICAgICAgICBUaGlzIGNyYXNoIGFwcGVhcnMgdG8gaGF2ZSBiZWVu IGNhdXNlZCBieSBodHRwOi8vdHJhYy53ZWJraXQub3JnL2NoYW5nZXNldC8xNjEyNzYgCisgICAg 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