Bug 35965 – REGRESSION: Crash when passing an object returned from plug-in back to the plug-in

• Component: Plug-ins
• Status: RESOLVED FIXED

[Christopher Hunt]

I have developed an NPAPI plugin which works fine under the production version of Safari. However the webkit nightly build crashes when I try and use it. Here is the crash report. Any ideas?

Process:         Safari [28533]
Path:            /Applications/Safari.app/Contents/MacOS/Safari
Identifier:      org.webkit.nightly.WebKit
Version:         r55772 (55772)
Code Type:       X86-64 (Native)
Parent Process:  launchd [92]

Date/Time:       2010-03-10 22:59:43.362 +1100
OS Version:      Mac OS X 10.6.2 (10C540)
Report Version:  6

Interval Since Last Report:          48354 sec
Crashes Since Last Report:           8
Per-App Interval Since Last Report:  338 sec
Per-App Crashes Since Last Report:   6
Anonymous UUID:                      A2081285-1753-4183-A2AE-0A11F26B1B1B

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x000000000000000c
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   com.apple.WebKit              	0x00000001002ec479 WebKit::NetscapePluginInstanceProxy::LocalObjectMap::retain(JSC::JSObject*) + 41
1   com.apple.WebKit              	0x00000001002f9571 WebKit::ProxyInstance::invoke(JSC::ExecState*, InvokeType, unsigned long long, JSC::ArgList const&) + 129
2   com.apple.WebKit              	0x00000001002f980a WebKit::ProxyInstance::invokeMethod(JSC::ExecState*, JSC::RuntimeMethod*, JSC::ArgList const&) + 138
3   com.apple.WebCore             	0x0000000100f99ca8 JSC::callRuntimeMethod(JSC::ExecState*, JSC::JSObject*, JSC::JSValue, JSC::ArgList const&) + 296
4   com.apple.JavaScriptCore      	0x00000001005d89bc cti_op_call_NotJSFunction + 412
5   ???                           	0x000026ca2ae4bc14 0 + 42649744882708
6   com.apple.JavaScriptCore      	0x00000001005a0c9f JSC::Interpreter::execute(JSC::FunctionExecutable*, JSC::ExecState*, JSC::JSFunction*, JSC::JSObject*, JSC::ArgList const&, JSC::ScopeChainNode*, JSC::JSValue*) + 495
7   ???                           	0x000000011681a800 0 + 4672563200
8   ???                           	0x000000011799b780 0 + 4690917248
9   com.apple.WebCore             	0x0000000100bc59b0 WebCore::JSHTMLDocument::~JSHTMLDocument() + 0
10  ???                           	0x8d48078948008a7c 0 + 10180395243870915196

Thread 1:  Dispatch queue: com.apple.libdispatch-manager
0   libSystem.B.dylib             	0x00007fff83472bba kevent + 10
1   libSystem.B.dylib             	0x00007fff83474a85 _dispatch_mgr_invoke + 154
2   libSystem.B.dylib             	0x00007fff8347475c _dispatch_queue_invoke + 185
3   libSystem.B.dylib             	0x00007fff83474286 _dispatch_worker_thread2 + 244
4   libSystem.B.dylib             	0x00007fff83473bb8 _pthread_wqthread + 353
5   libSystem.B.dylib             	0x00007fff83473a55 start_wqthread + 13

Thread 2:
0   libSystem.B.dylib             	0x00007fff834739da __workq_kernreturn + 10
1   libSystem.B.dylib             	0x00007fff83473dec _pthread_wqthread + 917
2   libSystem.B.dylib             	0x00007fff83473a55 start_wqthread + 13

Thread 3:  WebCore: IconDatabase
0   libSystem.B.dylib             	0x00007fff834949ee __semwait_signal + 10
1   libSystem.B.dylib             	0x00007fff834987f1 _pthread_cond_wait + 1286
2   com.apple.WebCore             	0x0000000100a7b739 WebCore::IconDatabase::syncThreadMainLoop() + 249
3   com.apple.WebCore             	0x0000000100a7b86a WebCore::IconDatabase::iconDatabaseSyncThread() + 170
4   libSystem.B.dylib             	0x00007fff83492f8e _pthread_start + 331
5   libSystem.B.dylib             	0x00007fff83492e41 thread_start + 13

Thread 4:  Safari: SafeBrowsingManager
0   libSystem.B.dylib             	0x00007fff83459e3a mach_msg_trap + 10
1   libSystem.B.dylib             	0x00007fff8345a4ad mach_msg + 59
2   com.apple.CoreFoundation      	0x00007fff83e347a2 __CFRunLoopRun + 1698
3   com.apple.CoreFoundation      	0x00007fff83e33c2f CFRunLoopRunSpecific + 575
4   com.apple.Safari              	0x0000000100025373 0x100000000 + 152435
5   com.apple.Safari              	0x0000000100025303 0x100000000 + 152323
6   libSystem.B.dylib             	0x00007fff83492f8e _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff83492e41 thread_start + 13

Thread 5:
0   libSystem.B.dylib             	0x00007fff83459e3a mach_msg_trap + 10
1   libSystem.B.dylib             	0x00007fff8345a4ad mach_msg + 59
2   com.apple.CoreFoundation      	0x00007fff83e347a2 __CFRunLoopRun + 1698
3   com.apple.CoreFoundation      	0x00007fff83e33c2f CFRunLoopRunSpecific + 575
4   com.apple.Foundation          	0x00007fff806bc4cf +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 297
5   com.apple.Foundation          	0x00007fff8063ce99 __NSThread__main__ + 1429
6   libSystem.B.dylib             	0x00007fff83492f8e _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff83492e41 thread_start + 13

Thread 6:
0   libSystem.B.dylib             	0x00007fff8349d9e2 select$DARWIN_EXTSN + 10
1   com.apple.CoreFoundation      	0x00007fff83e56242 __CFSocketManager + 818
2   libSystem.B.dylib             	0x00007fff83492f8e _pthread_start + 331
3   libSystem.B.dylib             	0x00007fff83492e41 thread_start + 13

Thread 7:  Safari: SnapshotStore
0   libSystem.B.dylib             	0x00007fff834949ee __semwait_signal + 10
1   libSystem.B.dylib             	0x00007fff834987f1 _pthread_cond_wait + 1286
2   com.apple.JavaScriptCore      	0x0000000100696a70 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 64
3   com.apple.Safari              	0x0000000100121287 0x100000000 + 1184391
4   com.apple.Safari              	0x0000000100044117 0x100000000 + 278807
5   com.apple.Safari              	0x0000000100043fb3 0x100000000 + 278451
6   libSystem.B.dylib             	0x00007fff83492f8e _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff83492e41 thread_start + 13

Thread 8:
0   libSystem.B.dylib             	0x00007fff83459e3a mach_msg_trap + 10
1   libSystem.B.dylib             	0x00007fff8345a4ad mach_msg + 59
2   com.apple.QuartzCore          	0x00007fff827d8d12 CA::Render::Server::server_thread(void*) + 177
3   com.apple.QuartzCore          	0x00007fff827d8c52 thread_fun + 34
4   libSystem.B.dylib             	0x00007fff83492f8e _pthread_start + 331
5   libSystem.B.dylib             	0x00007fff83492e41 thread_start + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000000  rcx: 0x0000000000000000  rdx: 0x0000000000000000
  rdi: 0x0000000000000000  rsi: 0x00007fff5fbfd248  rbp: 0x00007fff5fbfd260  rsp: 0x00007fff5fbfd230
   r8: 0x0000000000000001   r9: 0x00000001164fb6f0  r10: 0x0000000118100520  r11: 0x0000000117cc8e98
  r12: 0x00007fff5fbfd370  r13: 0x0000000117cbc180  r14: 0x00000001173dbaf0  r15: 0x000000000000001b
  rip: 0x00000001002ec479  rfl: 0x0000000000010246  cr2: 0x000000000000000c

Binary Images:
       0x100000000 -        0x10024ffef  com.apple.Safari 4.0.4 (6531.21.10) <0D08380C-D202-38C0-E01D-E304156E0423> /Applications/Safari.app/Contents/MacOS/Safari
       0x1002da000 -        0x1002ddfff +WebKitNightlyEnabler.dylib ??? (???) <9D73FA9F-5949-FC59-B7A9-B2B47A13F112> /Applications/WebKit.app/Contents/Resources/WebKitNightlyEnabler.dylib
       0x1002e2000 -        0x100458fef  com.apple.WebKit r55772 (533.3+) <45AE16F8-B24E-9EC0-C509-65CBD4811339> /Applications/WebKit.app/Contents/Frameworks/10.6/WebKit.framework/Versions/A/WebKit
       0x100520000 -        0x1006c9ff7  com.apple.JavaScriptCore 533+ (533.3+) <3B378AB4-D1D8-6F9C-B2F8-109841284985> /Applications/WebKit.app/Contents/Frameworks/10.6/JavaScriptCore.framework/Versions/A/JavaScriptCore
       0x100734000 -        0x10140efe7  com.apple.WebCore 533+ (533.3+) <2B065AFC-2FDE-02DA-3DFE-6AACB78D4BC0> /Applications/WebKit.app/Contents/Frameworks/10.6/WebCore.framework/Versions/A/WebCore
       0x101a27000 -        0x101a50ff7 +org.andymatuschak.Sparkle 1.5 Beta (git) (830f633) <945EA036-7EC3-D020-C889-29ECB588B891> /Applications/WebKit.app/Contents/Frameworks/10.6/Sparkle.framework/Versions/A/Sparkle
       0x101a6b000 -        0x101b51fe7  libcrypto.0.9.7.dylib ??? (???) <C6BE5498-A4AF-AB39-7F7E-FAF40D3582F6> /usr/lib/libcrypto.0.9.7.dylib
       0x116cf2000 -        0x116cf2fff  com.apple.JavaPluginCocoa 13.1.0 (13.1.0) <C1DB7C52-0812-0B24-6BB1-83E9149811D2> /System/Library/Frameworks/JavaVM.framework/Versions/A/Resources/JavaPluginCocoa.bundle/Contents/MacOS/JavaPluginCocoa
       0x117aec000 -        0x117af4ff7  com.apple.JavaVM 13.1.0 (13.1.0) <50BF10FF-1372-2993-B8E2-162E2FC99596> /System/Library/Frameworks/JavaVM.framework/Versions/A/JavaVM
    0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???) <B633F790-4DDB-53CD-7ACF-2A3682BCEA9F> /usr/lib/dyld
    0x7fff80003000 -     0x7fff80004ff7  com.apple.audio.units.AudioUnit 1.6.2 (1.6.2) <98969AA3-2394-34B5-2DC3-7F4187E96D26> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
    0x7fff80005000 -     0x7fff801c3fff  libicucore.A.dylib ??? (???) <5BD16988-545F-6A8C-9A6F-FB18ACDCAEC2> /usr/lib/libicucore.A.dylib
    0x7fff80238000 -     0x7fff8024dff7  com.apple.LangAnalysis 1.6.6 (1.6.6) <E83DAF4F-F284-BE0B-3D9D-D573023098B4> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis
    0x7fff8024e000 -     0x7fff80276fff  com.apple.DictionaryServices 1.1.1 (1.1.1) <9FD709FC-23F0-F270-EAC1-C590CD516A36> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/DictionaryServices.framework/Versions/A/DictionaryServices
    0x7fff80277000 -     0x7fff8037cfe7  libGLProgrammability.dylib ??? (???) <50498DA4-A2D6-260E-5C6E-994AF9BBDB98> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLProgrammability.dylib
    0x7fff80402000 -     0x7fff80520ff7  com.apple.PubSub 1.0.4 (65.11) <C1D56F85-7553-FB97-2A31-35CEB2BB8B63> /System/Library/Frameworks/PubSub.framework/Versions/A/PubSub
    0x7fff80521000 -     0x7fff8062bff7  com.apple.MeshKitIO 1.0 (49.0) <66600E25-66F9-D31A-EA47-E81518FF6DDA> /System/Library/PrivateFrameworks/MeshKit.framework/Versions/A/Frameworks/MeshKitIO.framework/Versions/A/MeshKitIO
    0x7fff8062c000 -     0x7fff808adfe7  com.apple.Foundation 6.6.1 (751.14) <767349DB-C486-70E8-7970-F13DB4CDAF37> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
    0x7fff80a92000 -     0x7fff80cfbfff  com.apple.QuartzComposer 4.1 (156.10) <F5569DC9-15E9-0815-3032-7E1257F36A3E> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuartzComposer.framework/Versions/A/QuartzComposer
    0x7fff80db1000 -     0x7fff80de6ff7  libcups.2.dylib ??? (???) <B7854E3A-784F-5033-1A47-CF2AE40C5855> /usr/lib/libcups.2.dylib
    0x7fff80de7000 -     0x7fff80e96fff  edu.mit.Kerberos 6.5.9 (6.5.9) <42364D54-C647-14DE-2B1C-D94DAA03F092> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
    0x7fff80e97000 -     0x7fff80edbfef  com.apple.ImageCaptureCore 1.0 (1.0) <29A6CF83-B5C2-9730-D71D-825AEC8657F5> /System/Library/Frameworks/ImageCaptureCore.framework/Versions/A/ImageCaptureCore
    0x7fff80edc000 -     0x7fff80f44ff7  com.apple.MeshKitRuntime 1.0 (49.0) <580F1945-540B-1E68-0341-A6ADAD78397E> /System/Library/PrivateFrameworks/MeshKit.framework/Versions/A/Frameworks/MeshKitRuntime.framework/Versions/A/MeshKitRuntime
    0x7fff80f45000 -     0x7fff81277fef  com.apple.CoreServices.CarbonCore 861.2 (861.2) <39F3B259-AC2A-792B-ECFE-4F3E72F2D1A5> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/CarbonCore.framework/Versions/A/CarbonCore
    0x7fff81278000 -     0x7fff81285fe7  libCSync.A.dylib ??? (???) <F4066C8C-2A3E-4F2F-9F4D-03DB56F7C5CB> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
    0x7fff81286000 -     0x7fff81303fef  libstdc++.6.dylib ??? (???) <35ECA411-2C08-FD7D-11B1-1B7A04921A5C> /usr/lib/libstdc++.6.dylib
    0x7fff81304000 -     0x7fff81366fe7  com.apple.datadetectorscore 2.0 (80.7) <F9D2332D-0890-2ED2-1AC8-F85CB89D8BD4> /System/Library/PrivateFrameworks/DataDetectorsCore.framework/Versions/A/DataDetectorsCore
    0x7fff81367000 -     0x7fff81b71fe7  libBLAS.dylib ??? (???) <FC941ECB-71D0-FAE3-DCBF-C5A619E594B8> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
    0x7fff81b95000 -     0x7fff81b95ff7  com.apple.CoreServices 44 (44) <210A4C56-BECB-E3E4-B6EE-7EC53E02265D> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
    0x7fff81c70000 -     0x7fff81c83fff  libGL.dylib ??? (???) <5F9DAF5F-C25C-B6C2-C9BC-3D91D723FD85> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
    0x7fff826c2000 -     0x7fff826c7ff7  com.apple.CommonPanels 1.2.4 (91) <4D84803B-BD06-D80E-15AE-EFBE43F93605> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CommonPanels.framework/Versions/A/CommonPanels
    0x7fff826dc000 -     0x7fff826ebfef  com.apple.opengl 1.6.5 (1.6.5) <30D6B03B-4B4C-1F78-1FDB-0403E7FE8707> /System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL
    0x7fff82745000 -     0x7fff82749ff7  libmathCommon.A.dylib ??? (???) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5> /usr/lib/system/libmathCommon.A.dylib
    0x7fff82786000 -     0x7fff82b1efff  com.apple.QuartzCore 1.6.1 (227.8) <E296B174-F7CB-F021-D103-091CCB33BBEB> /System/Library/Frameworks/QuartzCore.framework/Versions/A/QuartzCore
    0x7fff82be4000 -     0x7fff82c9afff  libobjc.A.dylib ??? (???) <F206BE6D-8777-AE6C-B367-7BEA76C14241> /usr/lib/libobjc.A.dylib
    0x7fff82c9b000 -     0x7fff82d18fef  com.apple.backup.framework 1.2 (1.2) <E3635A09-6221-71CE-6083-6025CE478634> /System/Library/PrivateFrameworks/Backup.framework/Versions/A/Backup
    0x7fff82d56000 -     0x7fff82d62fef  libbz2.1.0.dylib ??? (???) <4AA81AA7-DF37-6430-07D1-F59F37AEC357> /usr/lib/libbz2.1.0.dylib
    0x7fff82db4000 -     0x7fff82df7ff7  libRIP.A.dylib ??? (???) <9CA0768E-C2DF-61FD-F475-DB48F4219B49> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
    0x7fff82df8000 -     0x7fff82e18ff7  com.apple.DirectoryService.Framework 3.6 (621.1) <FC0C2E15-84E2-B4A8-18EE-3AE620111627> /System/Library/Frameworks/DirectoryService.framework/Versions/A/DirectoryService
    0x7fff82e49000 -     0x7fff82e64ff7  com.apple.openscripting 1.3.1 (???) <FD46A0FE-AC79-3EF7-AB4F-396D376DDE71> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/OpenScripting.framework/Versions/A/OpenScripting
    0x7fff82e95000 -     0x7fff82f49ff7  com.apple.ColorSync 4.6.2 (4.6.2) <78A86D96-7758-6BFE-7231-A0C70F185FDD> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ColorSync.framework/Versions/A/ColorSync
    0x7fff82fab000 -     0x7fff82fb0fff  libGIF.dylib ??? (???) <9DB87A71-27B7-A909-461B-F886DB2BD622> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
    0x7fff82fb1000 -     0x7fff82fe2fef  libTrueTypeScaler.dylib ??? (???) <8291D9BB-97B2-AD06-D565-58A14A20D617> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libTrueTypeScaler.dylib
    0x7fff82fe3000 -     0x7fff82feafff  com.apple.OpenDirectory 10.6 (10.6) <72A65D76-7831-D31E-F1B3-9E48BF26A98B> /System/Library/Frameworks/OpenDirectory.framework/Versions/A/OpenDirectory
    0x7fff82feb000 -     0x7fff83052fef  com.apple.AppleVAFramework 4.7.5 (4.7.5) <68D4E82B-7D55-A963-FF0B-80F276C1F2DE> /System/Library/PrivateFrameworks/AppleVA.framework/Versions/A/AppleVA
    0x7fff83053000 -     0x7fff83054fff  com.apple.MonitorPanelFramework 1.3.0 (1.3.0) <5062DACE-FCE7-8E41-F5F6-58821778629C> /System/Library/PrivateFrameworks/MonitorPanel.framework/Versions/A/MonitorPanel
    0x7fff83055000 -     0x7fff8320ffef  com.apple.ImageIO.framework 3.0.1 (3.0.1) <10202E28-34DD-71CA-BE5D-1BE5C8DE2198> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/ImageIO
    0x7fff83396000 -     0x7fff833c1ff7  libxslt.1.dylib ??? (???) <87A0B228-B24A-C426-C3FB-B40D7258DD49> /usr/lib/libxslt.1.dylib
    0x7fff833c8000 -     0x7fff83458fff  com.apple.SearchKit 1.3.0 (1.3.0) <4175DC31-1506-228A-08FD-C704AC9DF642> /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/SearchKit.framework/Versions/A/SearchKit
    0x7fff83459000 -     0x7fff83617ff7  libSystem.B.dylib ??? (???) <526DD3E5-2A8B-4512-ED97-01B832369959> /usr/lib/libSystem.B.dylib
    0x7fff83669000 -     0x7fff836e4ff7  com.apple.ISSupport 1.9.2 (50) <09D926B6-BBF7-7E15-2978-D0C4D933543D> /System/Library/PrivateFrameworks/ISSupport.framework/Versions/A/ISSupport
    0x7fff83730000 -     0x7fff83732fff  com.apple.print.framework.Print 6.0 (237) <70DA9755-5DC1-716B-77E2-E42C5DAB85A2> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Print.framework/Versions/A/Print
    0x7fff83733000 -     0x7fff83733ff7  com.apple.quartzframework 1.5 (1.5) <B182B579-BCCE-81BF-8DA2-9E0B7BDF8516> /System/Library/Frameworks/Quartz.framework/Versions/A/Quartz
    0x7fff83734000 -     0x7fff838a0ff7  com.apple.QTKit 7.6.3 (1591.3) <2AD2AC43-F6A8-F2CE-CCFE-9E8E38E47BB0> /System/Library/Frameworks/QTKit.framework/Versions/A/QTKit
    0x7fff838a1000 -     0x7fff838a7ff7  IOSurface ??? (???) <8E0EE904-59D1-9AA0-CE55-B1777F4BAEC1> /System/Library/Frameworks/IOSurface.framework/Versions/A/IOSurface
    0x7fff838a8000 -     0x7fff838b3ff7  com.apple.speech.recognition.framework 3.11.1 (3.11.1) <F0DDF27E-DB55-07CE-E548-C62095BE8167> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecognition.framework/Versions/A/SpeechRecognition
    0x7fff838b4000 -     0x7fff83911fef  com.apple.framework.IOKit 2.0 (???) <EBBEED67-D5BE-5F7F-96F4-9023BBA1B913> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit
    0x7fff83912000 -     0x7fff83961fef  libTIFF.dylib ??? (???) <796A1E6E-09B0-64F4-35F7-2ACEE9C2B429> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
    0x7fff83962000 -     0x7fff83a86fe7  com.apple.audio.toolbox.AudioToolbox 1.6.2 (1.6.2) <466C5725-8311-41F1-1653-EB5C80644ED7> /System/Library/Frameworks/AudioToolbox.framework/Versions/A/AudioToolbox
    0x7fff83c09000 -     0x7fff83c88fff  com.apple.audio.CoreAudio 3.2.2 (3.2.2) <2633DFAC-F6A6-489D-8DF0-F12639CCD8C4> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
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Model: MacBookPro5,5, BootROM MBP55.00AC.B03, 2 processors, Intel Core 2 Duo, 2.53 GHz, 4 GB, SMC 1.47f2
Graphics: NVIDIA GeForce 9400M, NVIDIA GeForce 9400M, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x8D), Broadcom BCM43xx 1.0 (5.10.91.26)
Bluetooth: Version 2.2.4f3, 2 service, 1 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: ST9250315ASG, 232.89 GB
Serial ATA Device: HL-DT-ST DVDRW  GS23N
USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0x24400000
USB Device: Internal Memory Card Reader, 0x05ac  (Apple Inc.), 0x8403, 0x26500000
USB Device: IR Receiver, 0x05ac  (Apple Inc.), 0x8242, 0x04500000
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0x04600000
USB Device: BRCM2046 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06100000
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8213, 0x06110000

[Alexey Proskuryakov]

Is there any way for us to reproduce the problem? This won't be easy to investigate if all we have is a crash log.

[Christopher Hunt]

(In reply to comment #1)
Thanks for your follow-up. It'd be tricky for me to supply my plugin so I'll have to and reproduce it with some stripped down version of it. I shall focus on this task and get back to you shortly.

[Christopher Hunt]

The problem only appears to occur when the plugin is running out of process. When running in process i.e. with WebKit invoked directly from the Xcode debugger, then all is well.

Still working on the production of a reproducible and releasable test.

[Christopher Hunt]

A further update: it appears as though the problem is associated with my plugin being scriptable. The following code works ok given that eo1 represents my plugin:

	var mapOverlay = eo1.createMapOverlay();

Similarly if I assign some native object then all is well:

	eo1.setProjection(true);

However if I attempt to assign the mapOverlay instance then it crashes as per previous crash report:

	eo1.setProjection(mapOverlay);

As stated, my JS/plugin interactions work just fine under production Safari and interestingly when running the nightly build via the debugger i.e. in-process plugins.

Will keep plugging away...

[Alexey Proskuryakov]

>    eo1.setProjection(mapOverlay);

Thanks, I could reproduce the problem with this information.

[Alexey Proskuryakov]

Created attachment 50510 [details]
test case (requires TestNetscapePlugin)

This test needs TestNetscapePlugin, which is part of WebKit regression tests support code. It won't crash if you open it without the plug-in installed.

[Alexey Proskuryakov]

<rdar://problem/7742771>

[Alexey Proskuryakov]

Created attachment 50550 [details]
proposed fix

[Geoffrey Garen]

Comment on attachment 50550 [details]
proposed fix

r=me

[Alexey Proskuryakov]

Committed <http://trac.webkit.org/changeset/55861>.

[Darin Adler]

Comment on attachment 50550 [details]
proposed fix

> +        Made rememberedObject a member of PluginObject. A plug-in must not use it's references
> +        to browser NPObjects after being destroyed, but this wasn't the case with static variable.

it's -> its

[Christopher Hunt]

I am happy to confirm that the problem has been fixed given the latest nightly build. Thank you for the extremely rapid response and solution.