Bug 82660 – Frequent crashes in JSC::parse in a worker thread when running regression tests

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Enrica Casucci]

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 (??? - ???) <393E2DB5-9479-39A6-A75A-B5F20B852532> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
    0x7fff85f0e000 -     0x7fff85febfef  libsystem_c.dylib (763.12.0 - compatibility 1.0.0) <FF69F06E-0904-3C08-A5EF-536FAFFFDC22> /usr/lib/system/libsystem_c.dylib
    0x7fff85fec000 -     0x7fff8641efef  com.apple.VideoToolbox (1.0 - 705.61) <1A70CA82-C849-3033-8598-37C5A72637CC> /System/Library/PrivateFrameworks/VideoToolbox.framework/Versions/A/VideoToolbox
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  Calls made by all processes on this machine:
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    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
===========                        =======
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shared memory                         308K
===========                        =======
TOTAL                                 1.4G
TOTAL, minus reserved VM space      559.2M

[Radar WebKit Bug Importer]

<rdar://problem/11151176>

[Michael Saboff]

Created attachment 134844 [details]
Patch

[Alexey Proskuryakov]

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?

[Alexey Proskuryakov]

Found it - the discussion was in bug 77593.

[Michael Saboff]

(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.

[Geoffrey Garen]

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.

[Benjamin Poulain]

> 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.

[Michael Saboff]

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.

[Benjamin Poulain]

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.

[Benjamin Poulain]

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.

[Geoffrey Garen]

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?

[Benjamin Poulain]

> 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.

[Michael Saboff]

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.

[Michael Saboff]

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.

[Michael Saboff]

Committed r113082: <http://trac.webkit.org/changeset/113082>