This crash happens intermittently on the test bots, mostly when running fast/workers/empty-worker-nocrash.html. In a debug build fast/workers/shared-worker-constructor.html hits an ASSERT every single time. I think that the two problems are related. Here is the crash log. Process: DumpRenderTree [83126] Path: /Volumes/VOLUME/*/DumpRenderTree Identifier: DumpRenderTree Version: ??? (???) Code Type: X86-64 (Native) Parent Process: Python [81663] Date/Time: 2012-03-29 13:38:13.721 -0700 OS Version: Mac OS X 10.7.3 (11D50) Report Version: 9 Crashed Thread: 11 WebCore: Worker Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000018 VM Regions Near 0x18: --> __TEXT 000000010b081000-000000010b0d9000 [ 352K] r-x/rwx SM=COW /Volumes/VOLUME/* Application Specific Information: objc[83126]: garbage collection is OFF Thread 0:: Dispatch queue: com.apple.main-thread 0 libsystem_kernel.dylib 0x00007fff8f2ad67a mach_msg_trap + 10 1 libsystem_kernel.dylib 0x00007fff8f2acd71 mach_msg + 73 2 libsystem_kernel.dylib 0x00007fff8f29fd84 mach_port_insert_member + 131 3 com.apple.CoreFoundation 0x00007fff900f3e00 __CFRunLoopRun + 1104 4 com.apple.CoreFoundation 0x00007fff900f3676 CFRunLoopRunSpecific + 230 5 com.apple.Foundation 0x00007fff89639f9f -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 267 6 DumpRenderTree 0x000000010b08eb42 _ZL7runTestRKNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEEE + 1793 (DumpRenderTree.mm:1356) 7 DumpRenderTree 0x000000010b08e214 dumpRenderTree(int, char const**) + 1848 (DumpRenderTree.mm:818) 8 DumpRenderTree 0x000000010b08eee1 main + 86 (DumpRenderTree.mm:905) 9 DumpRenderTree 0x000000010b083514 start + 52 Thread 1:: Dispatch queue: com.apple.libdispatch-manager 0 libsystem_kernel.dylib 0x00007fff8f2af7e6 kevent + 10 1 libdispatch.dylib 0x00007fff8cdf05be _dispatch_mgr_invoke + 923 2 libdispatch.dylib 0x00007fff8cdef14e _dispatch_mgr_thread + 54 Thread 2: 0 libsystem_kernel.dylib 0x00007fff8f2af192 __workq_kernreturn + 10 1 libsystem_c.dylib 0x00007fff85f5e594 _pthread_wqthread + 758 2 libsystem_c.dylib 0x00007fff85f5fb85 start_wqthread + 13 Thread 3: 0 libsystem_kernel.dylib 0x00007fff8f2af192 __workq_kernreturn + 10 1 libsystem_c.dylib 0x00007fff85f5e594 _pthread_wqthread + 758 2 libsystem_c.dylib 0x00007fff85f5fb85 start_wqthread + 13 Thread 4:: com.apple.NSURLConnectionLoader 0 libsystem_kernel.dylib 0x00007fff8f2ad67a mach_msg_trap + 10 1 libsystem_kernel.dylib 0x00007fff8f2acd71 mach_msg + 73 2 com.apple.CoreFoundation 0x00007fff900eb6fc __CFRunLoopServiceMachPort + 188 3 com.apple.CoreFoundation 0x00007fff900f3e64 __CFRunLoopRun + 1204 4 com.apple.CoreFoundation 0x00007fff900f3676 CFRunLoopRunSpecific + 230 5 com.apple.Foundation 0x00007fff89693ffb +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 335 6 com.apple.Foundation 0x00007fff8968874e -[NSThread main] + 68 7 com.apple.Foundation 0x00007fff896886c6 __NSThread__main__ + 1575 8 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 9 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 5: 0 libsystem_kernel.dylib 0x00007fff8f2af192 __workq_kernreturn + 10 1 libsystem_c.dylib 0x00007fff85f5e594 _pthread_wqthread + 758 2 libsystem_c.dylib 0x00007fff85f5fb85 start_wqthread + 13 Thread 6:: JavaScriptCore::Marking 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3034a4 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 212 (MarkStack.cpp:423) 3 com.apple.JavaScriptCore 0x000000010b303386 JSC::MarkStackThreadSharedData::markingThreadMain() + 214 (MarkStack.cpp:226) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 7:: JavaScriptCore::Marking 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3034a4 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 212 (MarkStack.cpp:423) 3 com.apple.JavaScriptCore 0x000000010b303386 JSC::MarkStackThreadSharedData::markingThreadMain() + 214 (MarkStack.cpp:226) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 8:: JavaScriptCore::Marking 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3034a4 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 212 (MarkStack.cpp:423) 3 com.apple.JavaScriptCore 0x000000010b303386 JSC::MarkStackThreadSharedData::markingThreadMain() + 214 (MarkStack.cpp:226) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 9:: JavaScriptCore::BlockFree 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3e8816 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 118 (ThreadingPthreads.cpp:415) 3 com.apple.JavaScriptCore 0x000000010b26765f JSC::Heap::blockFreeingThreadMain() + 191 (Heap.cpp:399) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 10: 0 libsystem_kernel.dylib 0x00007fff8f2af192 __workq_kernreturn + 10 1 libsystem_c.dylib 0x00007fff85f5e594 _pthread_wqthread + 758 2 libsystem_c.dylib 0x00007fff85f5fb85 start_wqthread + 13 Thread 11 Crashed:: WebCore: Worker 0 com.apple.JavaScriptCore 0x000000010b260a6c WTF::PassRefPtr<JSC::ProgramNode> JSC::parse<JSC::ProgramNode>(JSC::JSGlobalData*, JSC::JSGlobalObject*, JSC::SourceCode const&, JSC::FunctionParameters*, JSC::JSParserStrictness, JSC::JSParserMode, JSC::Debugger*, JSC::ExecState*, JSC::JSObject**) + 60 (StringImpl.h:287) 1 com.apple.JavaScriptCore 0x000000010b25f30e JSC::ProgramExecutable::compileInternal(JSC::ExecState*, JSC::ScopeChainNode*, JSC::JITCode::JITType) + 494 (PassRefPtr.h:161) 2 com.apple.JavaScriptCore 0x000000010b26eb23 JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::ScopeChainNode*, JSC::JSObject*) + 2787 (Executable.h:416) 3 com.apple.JavaScriptCore 0x000000010b1f63b8 JSC::evaluate(JSC::ExecState*, JSC::ScopeChainNode*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*) + 344 (Completion.cpp:73) 4 com.apple.WebCore 0x000000010c47eca1 WebCore::WorkerScriptController::evaluate(WebCore::ScriptSourceCode const&, WebCore::ScriptValue*) + 257 (Handle.h:70) 5 com.apple.WebCore 0x000000010c47eabc WebCore::WorkerScriptController::evaluate(WebCore::ScriptSourceCode const&) + 60 (Handle.h:70) 6 com.apple.WebCore 0x000000010c480689 WebCore::WorkerThread::workerThread() + 313 (ScriptSourceCode.h:45) 7 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 8 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 9 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 12:: JavaScriptCore::Marking 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3034a4 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 212 (MarkStack.cpp:423) 3 com.apple.JavaScriptCore 0x000000010b303386 JSC::MarkStackThreadSharedData::markingThreadMain() + 214 (MarkStack.cpp:226) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 13:: JavaScriptCore::Marking 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3034a4 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 212 (MarkStack.cpp:423) 3 com.apple.JavaScriptCore 0x000000010b303386 JSC::MarkStackThreadSharedData::markingThreadMain() + 214 (MarkStack.cpp:226) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 14:: JavaScriptCore::Marking 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3034a4 JSC::SlotVisitor::drainFromShared(JSC::SlotVisitor::SharedDrainMode) + 212 (MarkStack.cpp:423) 3 com.apple.JavaScriptCore 0x000000010b303386 JSC::MarkStackThreadSharedData::markingThreadMain() + 214 (MarkStack.cpp:226) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 15:: JavaScriptCore::BlockFree 0 libsystem_kernel.dylib 0x00007fff8f2aebca __psynch_cvwait + 10 1 libsystem_c.dylib 0x00007fff85f60274 _pthread_cond_wait + 840 2 com.apple.JavaScriptCore 0x000000010b3e8816 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 118 (ThreadingPthreads.cpp:415) 3 com.apple.JavaScriptCore 0x000000010b26765f JSC::Heap::blockFreeingThreadMain() + 191 (Heap.cpp:399) 4 com.apple.JavaScriptCore 0x000000010b3e820f _ZN3WTFL19wtfThreadEntryPointEPv + 15 (ThreadingPthreads.cpp:162) 5 libsystem_c.dylib 0x00007fff85f5c8bf _pthread_start + 335 6 libsystem_c.dylib 0x00007fff85f5fb75 thread_start + 13 Thread 11 crashed with X86 Thread State (64-bit): rax: 0x0000000000000000 rbx: 0x0000000000000000 rcx: 0x000000011275fed8 rdx: 0x000000011271fa60 rdi: 0x000000011138de80 rsi: 0x0000000111394000 rbp: 0x00000001120cb8f0 rsp: 0x00000001120cacf0 r8: 0x0000000000000000 r9: 0x0000000000000000 r10: 0x0000000111399000 r11: 0x00000001120cc400 r12: 0x0000000000000000 r13: 0x000000011275fed8 r14: 0x0000000111394000 r15: 0x000000011275fe80 rip: 0x000000010b260a6c rfl: 0x0000000000010206 cr2: 0x0000000000000018 Logical CPU: 7 Binary Images: 0x10b081000 - 0x10b0d8fff +DumpRenderTree (??? - ???) <7C545DE3-F44A-3363-8704-76CBE08E6B6F> /Volumes/VOLUME/*/DumpRenderTree 0x10b187000 - 0x10b199ff7 +libWebCoreTestSupport.dylib (536.5.0 - compatibility 1.0.0) <A4C12DE4-AED4-3188-AF7D-8906A06E65B8> /Volumes/VOLUME/*/libWebCoreTestSupport.dylib 0x10b1bf000 - 0x10b445fff com.apple.JavaScriptCore (536+ - 536.5+) <4E62BD8F-5514-395F-BC54-CC59CAC0D47C> /Volumes/VOLUME/*/JavaScriptCore.framework/Versions/A/JavaScriptCore 0x10b5ac000 - 0x10b730ff7 com.apple.WebKit (536+ - 536.5+) <90B54A74-3E15-3FBD-911B-AFACD738B75B> /Volumes/VOLUME/*/WebKit.framework/Versions/A/WebKit 0x10b8c6000 - 0x10c867fff com.apple.WebCore (536+ - 536.5+) <1E295F77-87A0-3124-B051-71174924C16B> /Volumes/VOLUME/*/WebCore.framework/Versions/A/WebCore 0x7fff6ac81000 - 0x7fff6acb5baf dyld (195.6 - ???) <0CD1B35B-A28F-32DA-B72E-452EAD609613> /usr/lib/dyld 0x7fff847e7000 - 0x7fff847faff7 libCRFSuite.dylib (??? - ???) <0B76941F-218E-30C8-B6DE-E15919F8DBEB> /usr/lib/libCRFSuite.dylib 0x7fff847fb000 - 0x7fff847fcfff libunc.dylib (24.0.0 - compatibility 1.0.0) <337960EE-0A85-3DD0-A760-7134CF4C0AFF> /usr/lib/system/libunc.dylib 0x7fff8498f000 - 0x7fff84990fff liblangid.dylib (??? - ???) <CACBE3C3-2F7B-3EED-B50E-EDB73F473B77> /usr/lib/liblangid.dylib 0x7fff84991000 - 0x7fff84992fff libdnsinfo.dylib (395.10.0 - compatibility 1.0.0) <2301DE05-6950-3AFF-A8A6-DA76D4C079B5> /usr/lib/system/libdnsinfo.dylib 0x7fff84993000 - 0x7fff84997ff7 com.apple.CommonPanels (1.2.5 - 94) <37C6540B-F8D1-355A-806C-F93D8FB522AB> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPanels.framework/Versions/A/CommonPanels 0x7fff84adb000 - 0x7fff84adcfff libDiagnosticMessagesClient.dylib (??? - ???) <3DCF577B-F126-302B-BCE2-4DB9A95B8598> /usr/lib/libDiagnosticMessagesClient.dylib 0x7fff84b62000 - 0x7fff84b69ff7 com.apple.CommerceCore (1.0 - 17) <3894FE48-EDCE-30E9-9796-E2F959D92704> /System/Library/PrivateFrameworks/CommerceKit.framework/Versions/A/Frameworks/CommerceCore.framework/Versions/A/CommerceCore 0x7fff84b98000 - 0x7fff84bdfff7 com.apple.CoreMedia (1.0 - 705.61) <0C34B0D4-DB8A-33C7-B67B-F443AD86482C> /System/Library/Frameworks/CoreMedia.framework/Versions/A/CoreMedia 0x7fff84be0000 - 0x7fff84bf0ff7 com.apple.opengl (1.7.6 - 1.7.6) <C168883D-9BC5-3C38-9937-42852D719718> /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL 0x7fff84bf1000 - 0x7fff84c06fff com.apple.speech.synthesis.framework (4.0.74 - 4.0.74) <C061ECBB-7061-3A43-8A18-90633F943295> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/SpeechSynthesis.framework/Versions/A/SpeechSynthesis 0x7fff84f2b000 - 0x7fff84f2dff7 com.apple.print.framework.Print (7.1 - 247.1) <8A4925A5-BAA3-373C-9B5D-03E0270C6B12> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print 0x7fff84f2e000 - 0x7fff84f40ff7 libz.1.dylib (1.2.5 - compatibility 1.0.0) <30CBEF15-4978-3DED-8629-7109880A19D4> /usr/lib/libz.1.dylib 0x7fff84f88000 - 0x7fff84f8efff com.apple.DiskArbitration (2.4.1 - 2.4.1) <CEA34337-63DE-302E-81AA-10D717E1F699> /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration 0x7fff85057000 - 0x7fff85164fff libJP2.dylib (??? - ???) <F2B34A61-75F0-3BFE-A309-EE0DF4AF9E37> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libJP2.dylib 0x7fff85165000 - 0x7fff851e0ff7 com.apple.print.framework.PrintCore (7.1 - 366.1) <3F140DEB-9F87-3672-97CC-F983752581AC> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/PrintCore.framework/Versions/A/PrintCore 0x7fff851e1000 - 0x7fff85249ff7 com.apple.audio.CoreAudio (4.0.2 - 4.0.2) <DFD8F4DE-3B45-3A2E-9CBE-FD8D5DD30923> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio 0x7fff8524a000 - 0x7fff85250fff IOSurface (??? - ???) <8114F62C-F75D-3123-99E9-268CB3AE74F7> /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface 0x7fff85251000 - 0x7fff85718fff FaceCoreLight (1.4.7 - compatibility 1.0.0) <E9D2A69C-6E81-358C-A162-510969F91490> /System/Library/PrivateFrameworks/FaceCoreLight.framework/Versions/A/FaceCoreLight 0x7fff85719000 - 0x7fff85719fff com.apple.CoreServices (53 - 53) <043C8026-8EDD-3241-B090-F589E24062EF> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices 0x7fff857d0000 - 0x7fff85853fef com.apple.Metadata (10.7.0 - 627.28) <1C14033A-69C9-3757-B24D-5583AEAC2CBA> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Metadata 0x7fff85940000 - 0x7fff8594aff7 liblaunch.dylib (392.36.0 - compatibility 1.0.0) <CB8B5808-80C0-318E-AE12-96CA916442FE> /usr/lib/system/liblaunch.dylib 0x7fff8594b000 - 0x7fff8599efff com.apple.AppleVAFramework (5.0.14 - 5.0.14) <45159B9E-05BF-35B2-AF76-D933490FBFB1> /System/Library/PrivateFrameworks/AppleVA.framework/Versions/A/AppleVA 0x7fff8599f000 - 0x7fff85a43fff com.apple.ink.framework (1.3.2 - 110) <C8840EA4-AE7B-360C-A191-D36B5F10B6B5> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink 0x7fff85a5a000 - 0x7fff85a6cff7 libbsm.0.dylib (??? - ???) <349BB16F-75FA-363F-8D98-7A9C3FA90A0D> /usr/lib/libbsm.0.dylib 0x7fff85a6d000 - 0x7fff85a7afff libCSync.A.dylib (600.0.0 - compatibility 64.0.0) <CBA71562-050B-3515-92B7-8BC1E2EEEF2A> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib 0x7fff85a7b000 - 0x7fff85a97ff7 com.apple.GenerationalStorage (1.0 - 126.1) <509F52ED-E54B-3FEF-B3C2-759387B826E6> /System/Library/PrivateFrameworks/GenerationalStorage.framework/Versions/A/GenerationalStorage 0x7fff85a9b000 - 0x7fff85ac8ff7 com.apple.opencl (1.50.69 - 1.50.69) <687265AF-E9B6-3537-89D7-7C12EB38193D> /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL 0x7fff85ac9000 - 0x7fff85d3cfff com.apple.CoreImage (7.93 - 1.0.1) <0B7D855E-A2B6-3C14-A242-2CF2165C6E7E> /System/Library/Frameworks/QuartzCore.framework/Versions/A/Frameworks/CoreImage.framework/Versions/A/CoreImage 0x7fff85d3d000 - 0x7fff85e96fff com.apple.audio.toolbox.AudioToolbox (1.7.2 - 1.7.2) <0AD8197C-1BA9-30CD-98F1-4CA2C6559BA8> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox 0x7fff85eba000 - 0x7fff85ebffff libGIF.dylib (??? - ???) 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Summary: Calls made by other processes targeting this process: task_for_pid: 2 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: 644912 thread_create: 0 thread_set_state: 0 VM Region Summary: ReadOnly portion of Libraries: Total=204.2M resident=107.7M(53%) swapped_out_or_unallocated=96.4M(47%) Writable regions: Total=1.1G written=11.9M(1%) resident=15.3M(1%) swapped_out=0K(0%) unallocated=1.1G(99%) REGION TYPE VIRTUAL =========== ======= CG backing stores 1888K CG image 1876K CG raster data 64K CG shared images 1216K CoreGraphics 16K CoreServices 788K JS JIT generated code 128.0M JS JIT generated code (reserved) 896.0M reserved VM address space (unallocated) JS VM register file 4096K JS VM register file (reserved) 4096K reserved VM address space (unallocated) JS garbage collector 1280K MALLOC 74.1M MALLOC guard page 48K Memory tag=251 16K SQLite page cache 384K STACK GUARD 56.1M Stack 15.6M VM_ALLOCATE 16.2M __CI_BITMAP 80K __DATA 17.1M __IMAGE 528K __LINKEDIT 67.4M __RC_CAMERAS 232K __TEXT 136.8M __UNICODE 544K mapped file 34.9M shared memory 308K =========== ======= TOTAL 1.4G TOTAL, minus reserved VM space 559.2M
<rdar://problem/11151176>
Created attachment 134844 [details] Patch
Comment on attachment 134844 [details] Patch I feel like I've seen this patch before, and we decided that this was the wrong way to deal with empty source code. Is that not the case?
Found it - the discussion was in bug 77593.
(In reply to comment #4) > Found it - the discussion was in bug 77593. I believe that bug 77593 handles the Null string case. This bug is to handle the empty string. Per our discussion, I will check to make sure that the normal script controller as well as the worker script controller both handle null and empty string the same.
My understanding is that the empty string is intended to be a valid zero-length string, and all interfaces should accept it, while the NULL string is like a NULL pointer, it means "unspecified" or "uninitialized", and some interfaces accept it while some don't. If this understanding is true, it's definitely wrong to require clients of JavaScriptCore to short-circuit and avoid passing the empty string to the interpreter. As I've said in person, there are many ways a client could pass us the empty string, including through API. Changing this one place to paper over the problem is wrong. If this understanding is true, the fix in bug 77593 is also wrong: The result of executing an "unspecified" or "uninitialized" string as JavaScript is unknown, and it's likely that any client passing us such a thing has made a programming error.
> If this understanding is true, the fix in bug 77593 is also wrong: The result of executing an "unspecified" or "uninitialized" string as JavaScript is unknown, and it's likely that any client passing us such a thing has made a programming error. I do not disagree regarding 77593. I needed a quick fix so we reverted to the behavior existing before is8Bit() was added. What you suggest would require more work but I think it is right.
Created attachment 135202 [details] Updated patch It turns out that isEmpty() works because it was checking both Null and empty. The issue we have here is the Null case. This patch uses a Null check in the caller to WorkerScriptController::evaluate() instead of having the isEmpty() check there.
Comment on attachment 135202 [details] Updated patch View in context: https://bugs.webkit.org/attachment.cgi?id=135202&action=review > Source/WebCore/workers/WorkerThread.cpp:153 > - script->evaluate(ScriptSourceCode(m_startupData->m_sourceCode, m_startupData->m_scriptURL)); > + if (!m_startupData->m_sourceCode.isNull()) > + script->evaluate(ScriptSourceCode(m_startupData->m_sourceCode, m_startupData->m_scriptURL)); With this, what will show up in the Inspector? My concern is it would show something fake starting for the current context instead of ignoring the previous context.
Comment on attachment 135202 [details] Updated patch View in context: https://bugs.webkit.org/attachment.cgi?id=135202&action=review >>> Source/WebCore/workers/WorkerThread.cpp:153 >>> + if (!m_startupData->m_sourceCode.isNull()) >>> + script->evaluate(ScriptSourceCode(m_startupData->m_sourceCode, m_startupData->m_scriptURL)); >> >> With this, what will show up in the Inspector? My concern is it would show something fake starting for the current context instead of ignoring the previous context. > > With this, what will show up in the Inspector? My concern is it would show something fake starting for the current context instead of ignoring the previous context. A better bottleneck for the NULL check is Worker::notifyFinished(). We should never start a worker thread with a NULL script. Once the worker has started, it should be able to assume that it has valid JavaScript to execute. Do you know why we end up with a NULL script and yet Worker::m_scriptLoader doesn't report that it failed to load?
> A better bottleneck for the NULL check is Worker::notifyFinished(). We should never start a worker thread with a NULL script. Once the worker has started, it should be able to assume that it has valid JavaScript to execute. > > Do you know why we end up with a NULL script and yet Worker::m_scriptLoader doesn't report that it failed to load? The common case I have seen goes like this: 1) page A schedule a thread 2) scripts change to page B 3) thread start on page B -->loaded was invalidated, source is now null I am sure there are other ways to invalidate the source, it is just what I have experienced.
Created attachment 135365 [details] Updated Patch > Do you know why we end up with a NULL script and yet Worker::m_scriptLoader doesn't report that it failed to load? WorkerScriptLoader::didReceiveData() allows for a null script to not be an error. It appears that the tests are checking the NULL case directly.
Created attachment 135410 [details] Final Patch Updated patch that initializes m_script to an empty string so that even when no input is given, it will be processed as an empty string. Reviewed in person by Geoff Garen.
Committed r113082: <http://trac.webkit.org/changeset/113082>