Bug 93199 – REGRESSION (r124489): Crash in FrameView::scrollContentsFastPath when scrolling Facebook and Google image search

• Status: RESOLVED
• Resolution: FIXED
• Component: Layout and Rendering

[Matt Arsenault]

r124698 nightly build


Process:         WebProcess [93336]
Path:            /Applications/WebKit.app/Contents/Frameworks/10.8/WebKit2.framework/WebProcess.app/Contents/MacOS/WebProcess
Identifier:      com.apple.WebProcess
Version:         537+ (537.4+)
Code Type:       X86-64 (Native)
Parent Process:  ??? [1]
User ID:         501

Date/Time:       2012-08-04 21:53:05.843 -0700
OS Version:      Mac OS X 10.8 (12A269)
Report Version:  10

Interval Since Last Report:          565602 sec
Crashes Since Last Report:           264
Per-App Crashes Since Last Report:   1
Anonymous UUID:                      3183F651-3AC1-40DC-B621-51660A642F5F

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

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000058

VM Regions Near 0x58:
--> 
   __TEXT                 0000000100f83000-0000000100f84000 [    4K] r-x/rwx SM=COW /Applications/WebKit.app/Contents/Frameworks/10.8/WebKit2.framework/WebProcess.app/Contents/MacOS/WebProcess

Application Specific Information:
Bundle controller class:
BrowserBundleController


Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.WebCore             	0x0000000101a322f7 WebCore::FrameView::scrollContentsFastPath(WebCore::IntSize const&, WebCore::IntRect const&, WebCore::IntRect const&) + 327
1   com.apple.WebCore             	0x00000001021304fc WebCore::ScrollView::scrollContents(WebCore::IntSize const&) + 364
2   com.apple.WebCore             	0x0000000102130375 WebCore::ScrollView::scrollTo(WebCore::IntSize const&) + 101
3   com.apple.WebCore             	0x0000000101a34a2c WebCore::FrameView::scrollTo(WebCore::IntSize const&) + 44
4   com.apple.WebCore             	0x00000001021302e4 WebCore::ScrollView::setScrollOffset(WebCore::IntPoint const&) + 180
5   com.apple.WebCore             	0x00000001021208f0 WebCore::ScrollableArea::scrollPositionChanged(WebCore::IntPoint const&) + 32
6   com.apple.WebCore             	0x000000010212085e WebCore::ScrollableArea::notifyScrollPositionChanged(WebCore::IntPoint const&) + 30
7   com.apple.WebCore             	0x000000010212b3ec WebCore::ScrollingCoordinator::updateMainFrameScrollPositionAndScrollLayerPosition() + 76
8   com.apple.WebCore             	0x000000010212b047 WebCore::ScrollingCoordinator::updateShouldUpdateScrollLayerPositionOnMainThread() + 87
9   com.apple.WebCore             	0x0000000101a31e56 WebCore::FrameView::addFixedObject(WebCore::RenderObject*) + 294
10  com.apple.WebCore             	0x0000000101fe7082 WebCore::RenderBox::styleWillChange(WebCore::StyleDifference, WebCore::RenderStyle const*) + 482
11  com.apple.WebCore             	0x0000000102065cb5 WebCore::RenderObject::setStyle(WTF::PassRefPtr<WebCore::RenderStyle>) + 101
12  com.apple.WebCore             	0x0000000102065ad9 WebCore::RenderObject::setAnimatableStyle(WTF::PassRefPtr<WebCore::RenderStyle>) + 153
13  com.apple.WebCore             	0x0000000101f665b4 WebCore::NodeRendererFactory::createRenderer() + 164
14  com.apple.WebCore             	0x0000000101f66810 WebCore::NodeRendererFactory::createRendererIfNeeded() + 544
15  com.apple.WebCore             	0x0000000101f5dc23 WebCore::Node::createRendererIfNeeded() + 35
16  com.apple.WebCore             	0x00000001019ae067 WebCore::Element::attach() + 39
17  com.apple.WebCore             	0x000000010179493c WebCore::ContainerNode::attach() + 28
18  com.apple.WebCore             	0x00000001019ae223 WebCore::Element::attach() + 483
19  com.apple.WebCore             	0x00000001019aea83 WebCore::Element::recalcStyle(WebCore::Node::StyleChange) + 499
20  com.apple.WebCore             	0x00000001019aeeb2 WebCore::Element::recalcStyle(WebCore::Node::StyleChange) + 1570
21  com.apple.WebCore             	0x00000001019aeeb2 WebCore::Element::recalcStyle(WebCore::Node::StyleChange) + 1570
22  com.apple.WebCore             	0x000000010186e3df WebCore::Document::recalcStyle(WebCore::Node::StyleChange) + 591
23  com.apple.WebCore             	0x000000010186ebdc WebCore::Document::updateStyleIfNeeded() + 76
24  com.apple.WebCore             	0x000000010186ecb7 WebCore::Document::updateLayout() + 55
25  com.apple.WebCore             	0x000000010186ed8b WebCore::Document::updateLayoutIgnorePendingStylesheets() + 123
26  com.apple.WebCore             	0x00000001019ac791 WebCore::Element::getBoundingClientRect() + 49
27  com.apple.WebCore             	0x0000000101cd50cf WebCore::jsElementPrototypeFunctionGetBoundingClientRect(JSC::ExecState*) + 111
28  ???                           	0x0000000103202265 0 + 4347404901
29  com.apple.JavaScriptCore      	0x00000001013eec91 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 913
30  com.apple.JavaScriptCore      	0x0000000101341ff4 JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 52
31  com.apple.JavaScriptCore      	0x000000010143d5f5 JSC::boundFunctionCall(JSC::ExecState*) + 405
32  com.apple.JavaScriptCore      	0x00000001013eedb1 JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 1201
33  com.apple.JavaScriptCore      	0x0000000101341ff4 JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 52
34  com.apple.WebCore             	0x000000010210bc4c WebCore::ScheduledAction::executeFunctionInContext(JSC::JSGlobalObject*, JSC::JSValue, WebCore::ScriptExecutionContext*) + 508
35  com.apple.WebCore             	0x000000010210b85c WebCore::ScheduledAction::execute(WebCore::Document*) + 156
36  com.apple.WebCore             	0x0000000101971356 WebCore::DOMTimer::fired() + 342
37  com.apple.WebCore             	0x00000001022bddd4 WebCore::ThreadTimers::sharedTimerFiredInternal() + 148
38  com.apple.WebCore             	0x0000000102150c23 WebCore::timerFired(__CFRunLoopTimer*, void*) + 51
39  com.apple.CoreFoundation      	0x00007fff8814f4b4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
40  com.apple.CoreFoundation      	0x00007fff8814efcd __CFRunLoopDoTimer + 557
41  com.apple.CoreFoundation      	0x00007fff881347b9 __CFRunLoopRun + 1513
42  com.apple.CoreFoundation      	0x00007fff88133dd2 CFRunLoopRunSpecific + 290
43  com.apple.HIToolbox           	0x00007fff8aa03774 RunCurrentEventLoopInMode + 209
44  com.apple.HIToolbox           	0x00007fff8aa03512 ReceiveNextEventCommon + 356
45  com.apple.HIToolbox           	0x00007fff8aa033a3 BlockUntilNextEventMatchingListInMode + 62
46  com.apple.AppKit              	0x00007fff8b6bdfa3 _DPSNextEvent + 685
47  com.apple.AppKit              	0x00007fff8b6bd862 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128
48  com.apple.AppKit              	0x00007fff8b6b4c03 -[NSApplication run] + 517
49  com.apple.WebCore             	0x0000000102107503 WebCore::RunLoop::run() + 67
50  com.apple.WebKit2             	0x00000001010b1b42 WebKit::WebProcessMain(WebKit::CommandLine const&) + 2586
51  com.apple.WebKit2             	0x0000000101060aeb WebKitMain + 285
52  com.apple.WebProcess          	0x0000000100f83e7b main + 214
53  libdyld.dylib                 	0x00007fff883bf7e1 start + 1

Thread 1:: Dispatch queue: com.apple.libdispatch-manager
0   libsystem_kernel.dylib        	0x00007fff933f5d16 kevent + 10
1   libdispatch.dylib             	0x00007fff935c7e26 _dispatch_mgr_invoke + 883
2   libdispatch.dylib             	0x00007fff935c7a2a _dispatch_mgr_thread + 54

Thread 2:: com.apple.NSURLConnectionLoader
0   libsystem_kernel.dylib        	0x00007fff933f3686 mach_msg_trap + 10
1   libsystem_kernel.dylib        	0x00007fff933f2c42 mach_msg + 70
2   com.apple.CoreFoundation      	0x00007fff8812ef23 __CFRunLoopServiceMachPort + 195
3   com.apple.CoreFoundation      	0x00007fff88134606 __CFRunLoopRun + 1078
4   com.apple.CoreFoundation      	0x00007fff88133dd2 CFRunLoopRunSpecific + 290
5   com.apple.Foundation          	0x00007fff919ad7d6 +[NSURLConnection(Loader) _resourceLoadLoop:] + 356
6   com.apple.Foundation          	0x00007fff91a0b842 __NSThread__main__ + 1345
7   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
8   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 3:: JavaScriptCore::BlockFree
0   libsystem_kernel.dylib        	0x00007fff933f50fa __psynch_cvwait + 10
1   libsystem_c.dylib             	0x00007fff87fedfc9 _pthread_cond_wait + 869
2   com.apple.JavaScriptCore      	0x0000000101591646 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 118
3   com.apple.JavaScriptCore      	0x0000000101559634 JSC::BlockAllocator::blockFreeingThreadMain() + 100
4   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
5   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
6   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 4:: JavaScriptCore::Marking
0   libsystem_kernel.dylib        	0x00007fff933f50fa __psynch_cvwait + 10
1   libsystem_c.dylib             	0x00007fff87fedfc9 _pthread_cond_wait + 869
2   com.apple.JavaScriptCore      	0x000000010148fe51 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 433
3   com.apple.JavaScriptCore      	0x000000010148fc12 JSC::MarkStackThreadSharedData::markingThreadMain(JSC::SlotVisitor*) + 34
4   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
5   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
6   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 5:: JavaScriptCore::Marking
0   libsystem_kernel.dylib        	0x00007fff933f50fa __psynch_cvwait + 10
1   libsystem_c.dylib             	0x00007fff87fedfc9 _pthread_cond_wait + 869
2   com.apple.JavaScriptCore      	0x000000010148fe51 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 433
3   com.apple.JavaScriptCore      	0x000000010148fc12 JSC::MarkStackThreadSharedData::markingThreadMain(JSC::SlotVisitor*) + 34
4   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
5   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
6   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 6:: JavaScriptCore::Marking
0   libsystem_kernel.dylib        	0x00007fff933f50fa __psynch_cvwait + 10
1   libsystem_c.dylib             	0x00007fff87fedfc9 _pthread_cond_wait + 869
2   com.apple.JavaScriptCore      	0x000000010148fe51 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 433
3   com.apple.JavaScriptCore      	0x000000010148fc12 JSC::MarkStackThreadSharedData::markingThreadMain(JSC::SlotVisitor*) + 34
4   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
5   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
6   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 7:: WebCore: Scrolling
0   libsystem_kernel.dylib        	0x00007fff933f3686 mach_msg_trap + 10
1   libsystem_kernel.dylib        	0x00007fff933f2c42 mach_msg + 70
2   com.apple.CoreFoundation      	0x00007fff8812ef23 __CFRunLoopServiceMachPort + 195
3   com.apple.CoreFoundation      	0x00007fff88134606 __CFRunLoopRun + 1078
4   com.apple.CoreFoundation      	0x00007fff88133dd2 CFRunLoopRunSpecific + 290
5   com.apple.CoreFoundation      	0x00007fff88142a81 CFRunLoopRun + 97
6   com.apple.WebCore             	0x000000010212c2e4 WebCore::ScrollingThread::initializeRunLoop() + 244
7   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
8   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
9   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 8:: com.apple.CFSocket.private
0   libsystem_kernel.dylib        	0x00007fff933f5322 __select + 10
1   com.apple.CoreFoundation      	0x00007fff88173bf6 __CFSocketManager + 1302
2   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
3   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 9:: WebCore: LocalStorage
0   libsystem_kernel.dylib        	0x00007fff933f50fa __psynch_cvwait + 10
1   libsystem_c.dylib             	0x00007fff87fedfc9 _pthread_cond_wait + 869
2   com.apple.JavaScriptCore      	0x000000010159160d WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 61
3   com.apple.WebCore             	0x0000000102173d21 WTF::PassOwnPtr<WebCore::StorageTask> WTF::MessageQueue<WebCore::StorageTask>::waitForMessageFilteredWithTimeout<bool (WebCore::StorageTask*)>(WTF::MessageQueueWaitResult&, bool (&)(WebCore::StorageTask*), double) + 81
4   com.apple.WebCore             	0x00000001021739da WebCore::StorageThread::threadEntryPoint() + 154
5   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
6   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
7   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 10:: WebCore: LocalStorage
0   libsystem_kernel.dylib        	0x00007fff933f50fa __psynch_cvwait + 10
1   libsystem_c.dylib             	0x00007fff87fedfc9 _pthread_cond_wait + 869
2   com.apple.JavaScriptCore      	0x000000010159160d WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 61
3   com.apple.WebCore             	0x0000000102173d21 WTF::PassOwnPtr<WebCore::StorageTask> WTF::MessageQueue<WebCore::StorageTask>::waitForMessageFilteredWithTimeout<bool (WebCore::StorageTask*)>(WTF::MessageQueueWaitResult&, bool (&)(WebCore::StorageTask*), double) + 81
4   com.apple.WebCore             	0x00000001021739da WebCore::StorageThread::threadEntryPoint() + 154
5   com.apple.JavaScriptCore      	0x000000010159105f WTF::wtfThreadEntryPoint(void*) + 15
6   libsystem_c.dylib             	0x00007fff87fe9782 _pthread_start + 327
7   libsystem_c.dylib             	0x00007fff87fd61c1 thread_start + 13

Thread 11:
0   libsystem_kernel.dylib        	0x00007fff933f56d6 __workq_kernreturn + 10
1   libsystem_c.dylib             	0x00007fff87febf2c _pthread_workq_return + 25
2   libsystem_c.dylib             	0x00007fff87febcf3 _pthread_wqthread + 412
3   libsystem_c.dylib             	0x00007fff87fd61b1 start_wqthread + 13

Thread 12:
0   libsystem_kernel.dylib        	0x00007fff933f56d6 __workq_kernreturn + 10
1   libsystem_c.dylib             	0x00007fff87febf2c _pthread_workq_return + 25
2   libsystem_c.dylib             	0x00007fff87febcf3 _pthread_wqthread + 412
3   libsystem_c.dylib             	0x00007fff87fd61b1 start_wqthread + 13

Thread 13:
0   libsystem_kernel.dylib        	0x00007fff933f56d6 __workq_kernreturn + 10
1   libsystem_c.dylib             	0x00007fff87febf2c _pthread_workq_return + 25
2   libsystem_c.dylib             	0x00007fff87febcf3 _pthread_wqthread + 412
3   libsystem_c.dylib             	0x00007fff87fd61b1 start_wqthread + 13

Thread 14:
0   libsystem_kernel.dylib        	0x00007fff933f56d6 __workq_kernreturn + 10
1   libsystem_c.dylib             	0x00007fff87febf2c _pthread_workq_return + 25
2   libsystem_c.dylib             	0x00007fff87febcf3 _pthread_wqthread + 412
3   libsystem_c.dylib             	0x00007fff87fd61b1 start_wqthread + 13

Thread 0 crashed with X86 Thread State (64-bit):
 rax: 0x0000000000000000  rbx: 0x000000015118d120  rcx: 0x0000001b000000dc  rdx: 0x00007fff5ec7a200
 rdi: 0x00007fff5ec7a158  rsi: 0x00007fff5ec7a130  rbp: 0x00007fff5ec7a510  rsp: 0x00007fff5ec7a0b0
  r8: 0x000000000000001b   r9: 0x00000000000003db  r10: 0x00007fff5ec7a320  r11: 0x00000000000000dc
 r12: 0x000000015176bd50  r13: 0x000000014cb7d000  r14: 0x000000014f3ba2c8  r15: 0x000000014f3ba400
 rip: 0x0000000101a322f7  rfl: 0x0000000000010283  cr2: 0x0000000000000058
Logical CPU: 1

Binary Images:
      0x100f83000 -        0x100f83fff  com.apple.WebProcess (537+ - 537.4+) <950CA3A7-52D5-302C-B59C-20423ACE1B6E> /Applications/WebKit.app/Contents/Frameworks/10.8/WebKit2.framework/WebProcess.app/Contents/MacOS/WebProcess
      0x100f8f000 -        0x100f8ffff +WebProcessShim.dylib (0) <679EBE0A-AA42-38AC-89A6-A958C7DF6F36> /Applications/WebKit.app/Contents/Frameworks/10.8/WebKit2.framework/WebProcess.app/Contents/MacOS/WebProcessShim.dylib
      0x100fc2000 -        0x1011aafff  com.apple.WebKit2 (537+ - 537.4+) <5CE3614E-A4B3-3F4D-B68C-BBD4EA535B5A> /Applications/WebKit.app/Contents/Frameworks/10.8/WebKit2.framework/WebKit2
      0x101319000 -        0x1015fefff  com.apple.JavaScriptCore (537+ - 537.4+) <BE850F62-471A-328A-B367-10C8CA6FE6DB> /Applications/WebKit.app/Contents/Frameworks/10.8/JavaScriptCore.framework/Versions/A/JavaScriptCore
      0x1016d1000 -        0x102756ff7  com.apple.WebCore (537+ - 537.4+) <50805646-DE0C-33DB-B855-28BD31F6E2E4> /Applications/WebKit.app/Contents/Frameworks/10.8/WebCore.framework/Versions/A/WebCore
      0x143309000 -        0x14330aff7  ATSHI.dylib (341) <07D6CB80-F51F-3BF8-985D-1ADED2B603AF> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/ATSHI.dylib
      0x145a96000 -        0x145c1fff7  com.apple.WebKit (r124698 - 537.4+) <F2784E89-420B-3C16-AA99-1510A675645F> /Applications/WebKit.app/Contents/Frameworks/10.8/WebKit.framework/Versions/A/WebKit
      0x145d12000 -        0x145d28fff  com.apple.WebInspector (8536 - 8536.24) <1C609DE6-B2DE-32A6-B039-9ED16253F7C8> /System/Library/PrivateFrameworks/WebInspector.framework/Versions/A/WebInspector
      0x1467c3000 -        0x1467d9ff7  com.apple.webcontentfilter.framework (3.1 - 5) <EA6EFE08-043B-3EA8-A4CC-CF61F4A149A8> /System/Library/PrivateFrameworks/WebContentAnalysis.framework/WebContentAnalysis
      0x147fa0000 -        0x147faeff7  libGPUSupport.dylib (8.5) <EBBD76FB-1C64-350C-9568-DB4C4C99602D> /System/Library/PrivateFrameworks/GPUSupport.framework/Versions/A/Libraries/libGPUSupport.dylib
      0x148097000 -        0x1480a0fef  libcldcpuengine.dylib (2.1.16) <BA5F6C17-7A08-3DCF-A30E-E9C4D76B7356> /System/Library/Frameworks/OpenCL.framework/Versions/A/Libraries/libcldcpuengine.dylib
      0x1480a6000 -        0x1480a9ff7  libCoreFSCache.dylib (24.4) <C375CAA0-F91F-3D9F-AF90-DB951BD86983> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCoreFSCache.dylib
      0x1482c8000 -        0x14847ffff  GLEngine (8.5) <AB9EB15E-11BB-34BF-B89E-02BC01916ABE> /System/Library/Frameworks/OpenGL.framework/Resources/GLEngine.bundle/GLEngine
      0x1484b6000 -        0x1485f7fff  libGLProgrammability.dylib (8.5) <2FFA7003-CB27-3A04-A4DC-8178545CF74B> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib
      0x1489f9000 -        0x148d89ff7  com.apple.driver.AppleIntelHDGraphicsGLDriver (8.0.51 - 8.0.0) <ABD7698A-892F-3BF8-93D3-6DA3CC27FC47> /System/Library/Extensions/AppleIntelHDGraphicsGLDriver.bundle/Contents/MacOS/AppleIntelHDGraphicsGLDriver
      0x148ea4000 -        0x148ed1fff  GLRendererFloat (8.5) <5486E8B9-3EF6-3C15-9CCB-28317B3BFA97> /System/Library/Frameworks/OpenGL.framework/Resources/GLRendererFloat.bundle/GLRendererFloat
      0x200000000 -        0x200822fff  com.apple.GeForceGLDriver (8.0.51 - 8.0.0) <0052635D-D9E8-33DB-B8B3-61A3169D7AA1> /System/Library/Extensions/GeForceGLDriver.bundle/Contents/MacOS/GeForceGLDriver
   0x7fff60b83000 -     0x7fff60bb793f  dyld (210.2.3) <A40597AA-5529-3337-8C09-D8A014EB1578> /usr/lib/dyld
   0x7fff87fb8000 -     0x7fff87fbcff7  com.apple.CommonPanels (1.2.5 - 94) <AAC003DE-2D6E-38B7-B66B-1F3DA91E7245> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPanels.framework/Versions/A/CommonPanels
   0x7fff87fbd000 -     0x7fff87fd4fff  com.apple.CFOpenDirectory (10.8 - 151.10) <FFBBA538-00B5-334E-BA5B-C8AD6CDCDA14> /System/Library/Frameworks/OpenDirectory.framework/Versions/A/Frameworks/CFOpenDirectory.framework/Versions/A/CFOpenDirectory
   0x7fff87fd5000 -     0x7fff880a1fef  libsystem_c.dylib (825.24) <16B6B86C-53EE-36E8-AC2B-4AADC1008098> /usr/lib/system/libsystem_c.dylib
   0x7fff880a2000 -     0x7fff880fefff  com.apple.QuickLookFramework (4.0 - 555.0) <8B163B8C-001E-3BBB-98ED-8173C68BC84C> /System/Library/Frameworks/QuickLook.framework/Versions/A/QuickLook
   0x7fff880ff000 -     0x7fff882e8fff  com.apple.CoreFoundation (6.8 - 744) <47AEA7C7-EF9B-3FC6-AEBF-CE02FC650301> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
   0x7fff8832b000 -     0x7fff883bcff7  com.apple.CorePDF (2.0 - 2) <BD4EBB01-5A60-34F1-B9DD-AF745AA10902> /System/Library/PrivateFrameworks/CorePDF.framework/Versions/A/CorePDF
   0x7fff883bd000 -     0x7fff883c0ff7  libdyld.dylib (210.2.3) <F59367C9-C110-382B-A695-9035A6DD387E> /usr/lib/system/libdyld.dylib
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   0x7fff923df000 -     0x7fff923e1fff  com.apple.OAuth (13.3 - 13.3) <0B7D051E-C639-34CC-A69B-EA2860112115> /System/Library/PrivateFrameworks/OAuth.framework/Versions/A/OAuth
   0x7fff923e2000 -     0x7fff9240bfff  libsandbox.1.dylib (220) <FCD65E60-6276-3455-8A11-09864DC9A285> /usr/lib/libsandbox.1.dylib
   0x7fff925c9000 -     0x7fff92873fff  com.apple.imageKit (2.2 - 660) <C14E3765-B683-3530-9312-256CEF43A258> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Versions/A/ImageKit
   0x7fff92874000 -     0x7fff928b4fff  com.apple.MediaKit (13 - 658) <3614D66C-0712-3049-9C5A-1ED9A94D82C5> /System/Library/PrivateFrameworks/MediaKit.framework/Versions/A/MediaKit
   0x7fff928b5000 -     0x7fff92911ff7  com.apple.Symbolication (1.3 - 93) <F2C7E0B6-B241-3020-B30A-0636D0FA3378> /System/Library/PrivateFrameworks/Symbolication.framework/Versions/A/Symbolication
   0x7fff92bd1000 -     0x7fff92bd5fff  com.apple.IOSurface (86.0.2 - 86.0.2) <739A481A-DF06-39EB-B784-D03BA1CBD762> /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface
   0x7fff92bd6000 -     0x7fff9337efff  com.apple.CoreAUC (6.16.00 - 6.16.00) <B0B4B5B8-6F8F-3221-9128-313E3B8C695D> /System/Library/PrivateFrameworks/CoreAUC.framework/Versions/A/CoreAUC
   0x7fff9337f000 -     0x7fff93392ff7  com.apple.LangAnalysis (1.7.0 - 1.7.0) <2F2694E9-A7BC-33C7-B4CF-8EC907DF0FEB> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis
   0x7fff93393000 -     0x7fff933e2ff7  libcorecrypto.dylib (106) <57BC99C6-3C3F-344C-BDD6-25E845D956F2> /usr/lib/system/libcorecrypto.dylib
   0x7fff933e3000 -     0x7fff933feff7  libsystem_kernel.dylib (2050.7.9) <E0447BF5-E104-35B0-B28B-4156887D58F1> /usr/lib/system/libsystem_kernel.dylib
   0x7fff933ff000 -     0x7fff93403fff  libGIF.dylib (843) <21324AF8-AFDA-3149-B547-C5109C1FBECF> /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
   0x7fff93404000 -     0x7fff9340efff  com.apple.DisplayServicesFW (2.6 - 352.4.2) <7FF30C43-84D7-3305-B8AD-F9754F3C582B> /System/Library/PrivateFrameworks/DisplayServices.framework/Versions/A/DisplayServices
   0x7fff9340f000 -     0x7fff93595fff  libBLAS.dylib (1073.3) <6B71AB8C-3D9A-33C2-9EAF-2A0BA504D493> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
   0x7fff93596000 -     0x7fff935c2fff  com.apple.quartzfilters (1.8.0 - 1.7.0) <B8DE45D7-1827-3379-A478-1A574A1D11D9> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuartzFilters.framework/Versions/A/QuartzFilters
   0x7fff935c3000 -     0x7fff935d8ff7  libdispatch.dylib (228.18) <0B6B6E7F-4D8A-3F3B-A4BF-6CF34638DBBB> /usr/lib/system/libdispatch.dylib
   0x7fff935d9000 -     0x7fff9360eff7  libTrueTypeScaler.dylib (84.5) <DF2335F3-07BE-30BA-B73C-3204E95B42C3> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libTrueTypeScaler.dylib
   0x7fff9360f000 -     0x7fff93615fff  libmacho.dylib (829) <BF332AD9-E89F-387E-92A4-6E1AB74BD4D9> /usr/lib/system/libmacho.dylib
   0x7fff93616000 -     0x7fff93622fff  libCSync.A.dylib (322) <C1321292-F5D3-3B8F-8CBB-57AC8E05F90C> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
   0x7fff93623000 -     0x7fff936f6ff7  com.apple.DiscRecording (7.0 - 7000.2.4) <49FD2D2F-4F2C-39B6-877B-6E3172577D18> /System/Library/Frameworks/DiscRecording.framework/Versions/A/DiscRecording
   0x7fff936f7000 -     0x7fff936ffff7  libsystem_dnssd.dylib (379.27) <057906EA-206E-3C35-B43F-5D936FD0A84F> /usr/lib/system/libsystem_dnssd.dylib
   0x7fff938b2000 -     0x7fff938c1ff7  libxar.1.dylib (105) <370ED355-E516-311E-BAFD-D80633A84BE1> /usr/lib/libxar.1.dylib
   0x7fff938c2000 -     0x7fff93906fff  libcups.2.dylib (327) <9B3F3321-D2BC-3195-BF20-4008FC52A390> /usr/lib/libcups.2.dylib
   0x7fff93907000 -     0x7fff93921fff  com.apple.CoreMediaAuthoring (2.1 - 914) <CFA664F9-D5A7-3281-A12F-3ED8A98FD8C1> /System/Library/PrivateFrameworks/CoreMediaAuthoring.framework/Versions/A/CoreMediaAuthoring
   0x7fff93922000 -     0x7fff939e7fff  com.apple.coreui (2.0 - 181) <CFCB6868-36AC-3734-ACEA-DF9CAB2B84F2> /System/Library/PrivateFrameworks/CoreUI.framework/Versions/A/CoreUI
   0x7fff93a42000 -     0x7fff93a7afff  libtidy.A.dylib (15.10) <9009156B-84F5-3781-BFCB-B409B538CD18> /usr/lib/libtidy.A.dylib
   0x7fff93a7b000 -     0x7fff93ae8ff7  com.apple.framework.IOKit (2.0 - 755.9.7) <9B7C5E7A-3F7A-3E70-8179-4384992B84E0> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
   0x7fff93ae9000 -     0x7fff93b52fff  libstdc++.6.dylib (56) <EAA2B53E-EADE-39CF-A0EF-FB9D4940672A> /usr/lib/libstdc++.6.dylib
   0x7fff94b06000 -     0x7fff94b28ff7  com.apple.Kerberos (2.0 - 1) <C49B8820-34ED-39D7-A407-A3E854153556> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
   0x7fff94b29000 -     0x7fff94de4fff  com.apple.AddressBook.framework (7.0 - 1143) <EC55CF4B-4194-3163-B6E1-8C8D2712FBCF> /System/Library/Frameworks/AddressBook.framework/Versions/A/AddressBook

External Modification Summary:
 Calls made by other processes targeting this process:
   task_for_pid: 7
   thread_create: 0
   thread_set_state: 0
 Calls made by this process:
   task_for_pid: 0
   thread_create: 0
   thread_set_state: 0
 Calls made by all processes on this machine:
   task_for_pid: 27977
   thread_create: 0
   thread_set_state: 526

VM Region Summary:
ReadOnly portion of Libraries: Total=251.1M resident=115.2M(46%) swapped_out_or_unallocated=135.9M(54%)
Writable regions: Total=1.4G written=107.3M(7%) resident=229.9M(16%) swapped_out=25.3M(2%) unallocated=1.2G(84%)

REGION TYPE                        VIRTUAL
===========                        =======
ATS (font support)                   59.8M
CG image                              264K
CG raster data                       2048K
CG shared images                     1216K
CoreAnimation                        6740K
CoreServices                         2096K
IOKit                               102.3M
JS JIT generated code               256.0M
JS JIT generated code (reserved)    768.0M        reserved VM address space (unallocated)
JS VM register file                  4096K
JS garbage collector                 6528K
MALLOC                              181.2M
MALLOC guard page                      48K
Memory tag=242                         12K
Memory tag=251                         16K
OpenGL GLSL                          1024K
SQLite page cache                    2400K
STACK GUARD                          56.1M
Stack                                14.7M
VM_ALLOCATE                          16.9M
WebCore purgeable data               3148K
__DATA                               26.4M
__IMAGE                               528K
__LINKEDIT                           64.7M
__TEXT                              186.4M
__UNICODE                             544K
mapped file                         123.8M
shared memory                        16.9M
===========                        =======
TOTAL                                 1.9G
TOTAL, minus reserved VM space        1.1G

Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i7, 2.66 GHz, 4 GB, SMC 1.58f15
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463235363634485A2D3147314631
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463235363634485A2D3147314631
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.81.20)
Bluetooth: Version 4.0.9f8 10405, 2 service, 18 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en1
Serial ATA Device: INTEL SSDSC2CW180A3, 180.05 GB
Serial ATA Device: INTEL SSDSA2M160G2GC, 160.04 GB
USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3
USB Device: hub_device, 0x0424  (SMSC), 0x2514, 0xfa100000 / 2
USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 9
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 5
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 3

[Tim Horton]

It looks to me like this is us trying to scroll a fixed-position renderer where style() is null in this part of scrollContentsFastPath:

for (FixedObjectSet::const_iterator it = m_fixedObjects->begin(); it != end; ++it) {
        RenderObject* renderer = *it;
        if (renderer->style()->position() != FixedPosition)
            continue;

It seems likely that this regressed in http://trac.webkit.org/changeset/121443, but I have not confirmed.

This crash is extremely easy to reproduce on release builds on pages with fixed position elements.

[Tim Horton]

Actually, regressing the bug suggests it started in http://trac.webkit.org/changeset/124489 (the range is slightly large, but that's the only related fix I see).

[Tim Horton]

*** Bug 93200 has been marked as a duplicate of this bug. ***

[Radar WebKit Bug Importer]

<rdar://problem/12035066>

[Beth Dakin]

I'm a bit torn about if I should fix the original bug in an entirely different way, or if I should keep the fix, but add another condition to the clause that I added to ScrollingCoordinator::setShouldUpdateScrollLayerPositionOnMainThread(). In the original fix, I just added:

    if (shouldUpdateScrollLayerPositionOnMainThread)
        updateMainFrameScrollPositionAndScrollLayerPosition();

But if we knew that we were mid-attach with the current fixed object, then we obviously wouldn't want to update the scroll position. It doesn't seem like there is currently any direct way to assess this though, so I would have to add something.

[Beth Dakin]

Created attachment 156782 [details]
Patch

[Beth Dakin]

Thanks Anders! Committed fix with http://trac.webkit.org/changeset/124811

[Rakesh]

*** Bug 93279 has been marked as a duplicate of this bug. ***

[Kevin M. Dean]

Search wish this fix would get released into the nightlies which haven't been updated in 4 days.