Bug 46161 – REGRESSION (r67838): Crash occurs when entering Reader mode at NY Times.com

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

[Chris Petersen]

Steps to reproduce:

1) On 10.6.4  with  Safari 5.0.2 installed, download and launch Webkit NB ( r67838 )
3) Go to any page like http://www.nytimes.com/2010/09/21/science/earth/21coral.html?_r=1&hp
4) Enter Reader mode. Crash occurs.


Process:         Safari [3141]
Path:            /Applications/Safari.app/Contents/MacOS/Safari
Identifier:      org.webkit.nightly.WebKit
Version:         r67838 (67838)
Code Type:       X86-64 (Native)
Parent Process:  launchd [2769]

Date/Time:       2010-09-20 20:56:45.856 -0700
OS Version:      Mac OS X 10.6.4 (10F569)
Report Version:  6

Interval Since Last Report:          32624 sec
Crashes Since Last Report:           20
Per-App Interval Since Last Report:  8379 sec
Per-App Crashes Since Last Report:   20
Anonymous UUID:                      B0A7A7C4-B6FC-43DE-8EBE-1ACD3F221BD4

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000118231710
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   ???                           	0x0000000118231710 0 + 4699920144

Thread 1:  Dispatch queue: com.apple.libdispatch-manager
0   libSystem.B.dylib             	0x00007fff835b408a kevent + 10
1   libSystem.B.dylib             	0x00007fff835b5f5d _dispatch_mgr_invoke + 154
2   libSystem.B.dylib             	0x00007fff835b5c34 _dispatch_queue_invoke + 185
3   libSystem.B.dylib             	0x00007fff835b575e _dispatch_worker_thread2 + 252
4   libSystem.B.dylib             	0x00007fff835b5088 _pthread_wqthread + 353
5   libSystem.B.dylib             	0x00007fff835b4f25 start_wqthread + 13

Thread 2:
0   libSystem.B.dylib             	0x00007fff835b4eaa __workq_kernreturn + 10
1   libSystem.B.dylib             	0x00007fff835b52bc _pthread_wqthread + 917
2   libSystem.B.dylib             	0x00007fff835b4f25 start_wqthread + 13

Thread 3:  WebCore: IconDatabase
0   libSystem.B.dylib             	0x00007fff835d5eb6 __semwait_signal + 10
1   libSystem.B.dylib             	0x00007fff835d9cd1 _pthread_cond_wait + 1286
2   com.apple.WebCore             	0x0000000101013e3d WebCore::IconDatabase::syncThreadMainLoop() + 269
3   com.apple.WebCore             	0x0000000101013f7c WebCore::IconDatabase::iconDatabaseSyncThread() + 172
4   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
5   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 4:  Safari: CertRevocationChecker
0   libSystem.B.dylib             	0x00007fff8359b2fa mach_msg_trap + 10
1   libSystem.B.dylib             	0x00007fff8359b96d mach_msg + 59
2   com.apple.CoreFoundation      	0x00007fff88ef63c2 __CFRunLoopRun + 1698
3   com.apple.CoreFoundation      	0x00007fff88ef584f CFRunLoopRunSpecific + 575
4   com.apple.Safari              	0x000000010002fa41 0x100000000 + 195137
5   com.apple.Safari              	0x000000010002f9d1 0x100000000 + 195025
6   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 5:
0   libSystem.B.dylib             	0x00007fff8359b2fa mach_msg_trap + 10
1   libSystem.B.dylib             	0x00007fff8359b96d mach_msg + 59
2   com.apple.CoreFoundation      	0x00007fff88ef63c2 __CFRunLoopRun + 1698
3   com.apple.CoreFoundation      	0x00007fff88ef584f CFRunLoopRunSpecific + 575
4   com.apple.Foundation          	0x00007fff82a2b4c3 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 297
5   com.apple.Foundation          	0x00007fff829abe8d __NSThread__main__ + 1429
6   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 6:  Safari: SafeBrowsingManager
0   libSystem.B.dylib             	0x00007fff8359b2fa mach_msg_trap + 10
1   libSystem.B.dylib             	0x00007fff8359b96d mach_msg + 59
2   com.apple.CoreFoundation      	0x00007fff88ef63c2 __CFRunLoopRun + 1698
3   com.apple.CoreFoundation      	0x00007fff88ef584f CFRunLoopRunSpecific + 575
4   com.apple.Safari              	0x000000010002fa41 0x100000000 + 195137
5   com.apple.Safari              	0x000000010002f9d1 0x100000000 + 195025
6   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 7:  WebCore: LocalStorage
0   libSystem.B.dylib             	0x00007fff835d5eb6 __semwait_signal + 10
1   libSystem.B.dylib             	0x00007fff835d9cd1 _pthread_cond_wait + 1286
2   com.apple.JavaScriptCore      	0x0000000100901b10 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 64
3   com.apple.WebCore             	0x0000000101488e31 WebCore::LocalStorageThread::threadEntryPoint() + 193
4   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
5   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 8:  Safari: SnapshotStore
0   libSystem.B.dylib             	0x00007fff835d5eb6 __semwait_signal + 10
1   libSystem.B.dylib             	0x00007fff835d9cd1 _pthread_cond_wait + 1286
2   com.apple.JavaScriptCore      	0x0000000100901b10 WTF::ThreadCondition::timedWait(WTF::Mutex&, double) + 64
3   com.apple.Safari              	0x00000001001be851 0x100000000 + 1828945
4   com.apple.Safari              	0x000000010004750f 0x100000000 + 292111
5   com.apple.Safari              	0x000000010004738d 0x100000000 + 291725
6   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
7   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 9:
0   libSystem.B.dylib             	0x00007fff835dedce select$DARWIN_EXTSN + 10
1   com.apple.CoreFoundation      	0x00007fff88f17e92 __CFSocketManager + 818
2   libSystem.B.dylib             	0x00007fff835d4456 _pthread_start + 331
3   libSystem.B.dylib             	0x00007fff835d4309 thread_start + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x00000000ffffffff  rbx: 0x00000001182316f8  rcx: 0x0000000118231710  rdx: 0x0000000000000005
  rdi: 0x00000001035899e0  rsi: 0x0000000000000008  rbp: 0x00000001182316f8  rsp: 0x00007fff5fbfeb28
   r8: 0x0000000000000020   r9: 0x0000000118161620  r10: 0x000000011b23d000  r11: 0x00000001037ad9c0
  r12: 0x0000000000000000  r13: 0x0000000000000003  r14: 0x000000011814d5d0  r15: 0x0000000000000003
  rip: 0x0000000118231710  rfl: 0x0000000000010206  cr2: 0x0000000118231710

Binary Images:
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       0x10075c000 -        0x10075ffff +WebKitNightlyEnabler.dylib ??? (???) <6E02D2E4-C470-A8E6-3C52-1303DE3F4BBB> /Users/cp/Desktop/67838/WebKit.app/Contents/Resources/WebKitNightlyEnabler.dylib
       0x100764000 -        0x10095eff7  com.apple.JavaScriptCore 534+ (534.9+) <AAAB3C42-5C3B-56CD-1ACD-AD7EF28D8219> /Users/cp/Desktop/67838/WebKit.app/Contents/Frameworks/10.6/JavaScriptCore.framework/Versions/A/JavaScriptCore
       0x1009d0000 -        0x100b5cfff  com.apple.WebKit r67838 (534.9+) <B1681F46-CBFF-09A5-999A-728EA78BF4CE> /Users/cp/Desktop/67838/WebKit.app/Contents/Frameworks/10.6/WebKit.framework/Versions/A/WebKit
       0x100c32000 -        0x101b3dff7  com.apple.WebCore 534+ (534.9+) <925CEE0C-1447-52D0-BD6E-A296A32358A7> /Users/cp/Desktop/67838/WebKit.app/Contents/Frameworks/10.6/WebCore.framework/Versions/A/WebCore
       0x10222a000 -        0x102253ff7 +org.andymatuschak.Sparkle 1.5 Beta (git) (830f633) <945EA036-7EC3-D020-C889-29ECB588B891> /Users/cp/Desktop/67838/WebKit.app/Contents/Frameworks/10.6/Sparkle.framework/Versions/A/Sparkle
       0x10226e000 -        0x102354fe7  libcrypto.0.9.7.dylib 0.9.7 (compatibility 0.9.7) <64B3566E-5F3A-A466-ED3F-B91F4B3E5F56> /usr/lib/libcrypto.0.9.7.dylib
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       0x117a52000 -        0x117a5aff7  com.apple.JavaVM 13.2.0 (13.2.0) <DD0E846A-3313-09DE-D17A-AE6A3D47DC86> /System/Library/Frameworks/JavaVM.framework/Versions/A/JavaVM
    0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???) <B536F2F1-9DF1-3B6C-1C2C-9075EA219A06> /usr/lib/dyld
    0x7fff80003000 -     0x7fff80015fe7  libsasl2.2.dylib 3.15.0 (compatibility 3.0.0) <30FE378B-99FE-8C7C-06D0-A3AA0A0A70D4> /usr/lib/libsasl2.2.dylib
    0x7fff8003e000 -     0x7fff803dffe7  com.apple.RawCamera.bundle 3.3.0 (533) <84ACD5A6-A184-0D4A-24C6-41D14291E8EC> /System/Library/CoreServices/RawCamera.bundle/Contents/MacOS/RawCamera
    0x7fff803e0000 -     0x7fff8042ffef  libTIFF.dylib ??? (???) <A66CBA9C-A38D-5EDB-BFB5-CB398F033D6F> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
    0x7fff80430000 -     0x7fff8043dfe7  libCSync.A.dylib 543.50.0 (compatibility 64.0.0) <7B891D4C-1F19-4DB0-FD12-7A7D5E8F47AE> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libCSync.A.dylib
    0x7fff80622000 -     0x7fff80663fff  com.apple.SystemConfiguration 1.10.2 (1.10.2) <BC27BDD4-9CC8-9AF0-B4C2-DD50FD751CBF> /System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration
    0x7fff80664000 -     0x7fff8066cfff  com.apple.DisplayServicesFW 2.2.2 (251) <A8AA237B-26DA-455D-4133-69B1D1E45DF4> /System/Library/PrivateFrameworks/DisplayServices.framework/Versions/A/DisplayServices
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    0x7fff8077b000 -     0x7fff807b0fef  com.apple.framework.Apple80211 6.2.3 (623.1) <E58C0A3A-BA14-9703-F6A3-3951A862570C> /System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Apple80211
    0x7fff807b1000 -     0x7fff807b1ff7  com.apple.Accelerate.vecLib 3.6 (vecLib 3.6) <4CCE5D69-F1B3-8FD3-1483-E0271DB2CCF3> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
    0x7fff807b2000 -     0x7fff807e1fff  com.apple.quartzfilters 1.6.0 (1.6.0) <52D41730-D485-A7AE-4937-FE37FC732F65> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/QuartzFilters.framework/Versions/A/QuartzFilters
    0x7fff807e2000 -     0x7fff80831ff7  com.apple.DirectoryService.PasswordServerFramework 6.0 (6.0) <F5B744D7-AEAF-6B66-43CF-6E31CDA18EAB> /System/Library/PrivateFrameworks/PasswordServer.framework/Versions/A/PasswordServer
    0x7fff80832000 -     0x7fff80d36fe7  com.apple.VideoToolbox 0.484.11 (484.11) <4577FF14-E6A7-AAD8-E6E6-ECA9CFCC6989> /System/Library/PrivateFrameworks/VideoToolbox.framework/Versions/A/VideoToolbox
    0x7fff80d37000 -     0x7fff80d43fff  libbz2.1.0.dylib 1.0.5 (compatibility 1.0.0) <ECA200F9-9C46-579A-6447-16B8BFB93D96> /usr/lib/libbz2.1.0.dylib
    0x7fff80ec4000 -     0x7fff80ee9ff7  com.apple.CoreVideo 1.6.1 (45.5) <97AF669D-5482-7AD5-849B-A64E7D98AC94> /System/Library/Frameworks/CoreVideo.framework/Versions/A/CoreVideo
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    0x7fff8127c000 -     0x7fff812b9fff  com.apple.LDAPFramework 2.0 (120.1) <F3B7B267-D580-F287-6DE7-8AC91C92AB35> /System/Library/Frameworks/LDAP.framework/Versions/A/LDAP
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    0x7fff81376000 -     0x7fff8138bff7  com.apple.LangAnalysis 1.6.6 (1.6.6) <DC999B32-BF41-94C8-0583-27D9AB463E8B> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/LangAnalysis.framework/Versions/A/LangAnalysis
    0x7fff813d7000 -     0x7fff81452fff  com.apple.ISSupport 1.9.3 (51) <FED5B421-7B80-AAB5-F552-26AEC9F45800> /System/Library/PrivateFrameworks/ISSupport.framework/Versions/A/ISSupport
    0x7fff81453000 -     0x7fff81453ff7  com.apple.Cocoa 6.6 (???) <C69E895A-1C66-3DA9-5F63-8BE85DB9C4E1> /System/Library/Frameworks/Cocoa.framework/Versions/A/Cocoa
    0x7fff81454000 -     0x7fff8156bfef  libxml2.2.dylib 10.3.0 (compatibility 10.0.0) <AFE91118-DBF3-6313-37B8-8A2002C6A46B> /usr/lib/libxml2.2.dylib
    0x7fff8156c000 -     0x7fff8157aff7  libkxld.dylib ??? (???) <EE840168-1F67-6219-8BA3-C46039BCC8B3> /usr/lib/system/libkxld.dylib
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    0x7fff816fe000 -     0x7fff81721fff  com.apple.opencl 12.1 (12.1) <403E8F37-4348-B9BC-08E6-7693A995B7EC> /System/Library/Frameworks/OpenCL.framework/Versions/A/OpenCL
    0x7fff81722000 -     0x7fff81733fff  SyndicationUI ??? (???) <AB222D54-3800-754D-C234-9FD5F1ACA7EB> /System/Library/PrivateFrameworks/SyndicationUI.framework/Versions/A/SyndicationUI
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    0x7fff820a2000 -     0x7fff820a2ff7  com.apple.CoreServices 44 (44) <616722B1-5E79-DCCF-BF5E-0DD5802CCBD9> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
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    0x7fff82528000 -     0x7fff82579fe7  com.apple.HIServices 1.8.0 (???) <2D0D9100-B712-ED4B-7622-BBA92053F446> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
    0x7fff8257a000 -     0x7fff8258efff  libGL.dylib ??? (???) <5AD69545-D1A3-C017-C7AF-B4AFD6F08FA2> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib
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    0x7fff82eee000 -     0x7fff82eeeff7  com.apple.ApplicationServices 38 (38) <0E2FC75E-2BE2-D04D-CA78-76E38A89DD30> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
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    0x7fff88df3000 -     0x7fff88ea9fff  libobjc.A.dylib 227.0.0 (compatibility 1.0.0) <1960E662-D35C-5D98-EB16-D43166AE6A22> /usr/lib/libobjc.A.dylib
    0x7fff88eaa000 -     0x7fff8901fff7  com.apple.CoreFoundation 6.6.3 (550.29) <48810602-63C3-994D-E563-DD02B16E76E1> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x7fff89020000 -     0x7fff890d5fe7  com.apple.ink.framework 1.3.3 (107) <A68339AA-909D-E46C-35C0-72808EE3D043> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink
    0x7fffffe00000 -     0x7fffffe01fff  libSystem.B.dylib ??? (???) <95E02DD0-ADEA-745B-E7FA-ABA064E4658C> /usr/lib/libSystem.B.dylib

Model: MacBook7,1, BootROM MB71.0039.B09, 2 processors, Intel Core 2 Duo, 2.4 GHz, 2 GB, SMC 1.60f5
Graphics: NVIDIA GeForce 320M, NVIDIA GeForce 320M, PCI, 256 MB
Memory Module: global_name
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.10.131.16.1)
Bluetooth: Version 2.3.7f1, 2 service, 19 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545025B9SA02, 232.89 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: Built-in iSight, 0x05ac  (Apple Inc.), 0x8507, 0x24600000
USB Device: Apple Internal Keyboard / Trackpad, 0x05ac  (Apple Inc.), 0x0236, 0x06300000
USB Device: BRCM2070 Hub, 0x0a5c  (Broadcom Corp.), 0x4500, 0x06600000
USB Device: Bluetooth USB Host Controller, 0x05ac  (Apple Inc.), 0x8218, 0x06630000

[David Harrison]

Dupe of https://bugs.webkit.org/show_bug.cgi?id=46077 ??
That was addressed in r67867.
Chris, does this occur post r67867?

[Chris Petersen]

The latest nightly builds are only r67838 so I can try when a newer NB revision is available. Does the problem mentioned in https://bugs.webkit.org/show_bug.cgi?id=46159 resolved by http://trac.webkit.org/changeset/67867 ?

[Darin Adler]

Yes, bug 46159 looks like another duplicate to me.

[Alexey Proskuryakov]

There were other crashes with missing stack trace reported recently: bug 46094, bug 46159, bug 46102.

[Chris Petersen]

Alexey,

I think I'm seeing the same bug when I attempt to load CNN.com with NB r67838. The site is in the process of loading in the browser window and I experience a hang. Extensions are disabled and I still encountered. This doesn't happen with Safari 5.0.2 ( stock webkit ) on 10.6.4 but only happens on NB r67838..

Sample shows the following:


Analysis of sampling Safari (pid 3945) every 1 millisecond
Call graph:
    7346 Thread_129057   DispatchQueue_1: com.apple.main-thread  (serial)
      7346 0xaffffffff
        7346 JSC::RegExp::match(JSC::UString const&, int, WTF::Vector<int, 32ul>*)
          3274 0x4fc30a442f43
          1390 0x4fc30a442f3b
          1362 0x4fc30a442f6b
          655 0x4fc30a442f70
          440 0x4fc30a442f76
          225 0x4fc30a442f7b
    7346 Thread_129073   DispatchQueue_2: com.apple.libdispatch-manager  (serial)
      7346 start_wqthread
        7346 _pthread_wqthread
          7346 _dispatch_worker_thread2
            7346 _dispatch_queue_invoke
              7346 _dispatch_mgr_invoke
                7346 kevent
    7346 Thread_129078: WebCore: IconDatabase
      7346 thread_start
        7346 _pthread_start
          7346 WebCore::IconDatabase::iconDatabaseSyncThread()
            7346 WebCore::IconDatabase::syncThreadMainLoop()
              7346 _pthread_cond_wait
                7346 __semwait_signal
    7346 Thread_129083: Safari: SafeBrowsingManager
      7346 thread_start
        7346 _pthread_start
          7346 0x10002f9d1
            7346 0x10002fa41
              7346 CFRunLoopRunSpecific
                7346 __CFRunLoopRun
                  7346 mach_msg
                    7346 mach_msg_trap
    7346 Thread_129084
      7346 thread_start
        7346 _pthread_start
          7346 __NSThread__main__
            7346 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:]
              7346 CFRunLoopRunSpecific
                7346 __CFRunLoopRun
                  7345 mach_msg
                    7345 mach_msg_trap
                  1 ConnectionTimerTLS::_timerPurgeEntries(__CFRunLoopTimer*, void*)
                    1 ConnectionCacheTLS::resetCacheForThisThread()
                      1 HTTPConnectionCacheDictionary::forgetCacheEntries()
                        1 HTTPConnectionCacheEntry::removeAllConnections()
                          1 UnauthConnectionArray::removeValueAtIndex(long)
                            1 NetConnection::doNotAllowMoreReqeusts()
                              1 NetConnection::closeStreamsIfPossibleOrSignalThatThatNeedsToBeDonePrettyPlease()
                                1 NetConnection::shutdownConnectionStreams()
                                  1 _CFRelease
                                    1 __CFStreamDeallocate
                                      1 _CFRelease
                                        1 HTTPReadFilter::~HTTPReadFilter()
                                          1 _CFRelease
                                            1 __CFStreamDeallocate
                                              1 _CFRelease
                                                1 SocketStream::~SocketStream()
    7346 Thread_129087
      7346 thread_start
        7346 _pthread_start
          7346 __CFSocketManager
            7346 select$DARWIN_EXTSN
    7346 Thread_129088: Safari: SnapshotStore
      7346 thread_start
        7346 _pthread_start
          7346 0x10004738d
            7346 0x10004750f
              7346 0x1001be851
                7346 WTF::ThreadCondition::timedWait(WTF::Mutex&, double)
                  7346 _pthread_cond_wait
                    7346 __semwait_signal
    7346 Thread_129113: Safari: SpinningProgressIndicator
      7346 thread_start
        7346 _pthread_start
          7346 __NSThread__main__
            7346 0x1000903f7
              7346 -[NSRunLoop(NSRunLoop) run]
                7346 -[NSRunLoop(NSRunLoop) runMode:beforeDate:]
                  7346 CFRunLoopRunSpecific
                    7346 __CFRunLoopRun
                      7331 mach_msg
                        7331 mach_msg_trap
                      15 __NSFireTimer
                        6 0x100090a5a
                          6 0x100090dac
                            6 0x10008f88c
                              6 -[NSImage compositeToPoint:operation:]
                                4 -[NSImage _composite:delta:fromRect:toPoint:]
                                  4 -[NSImage drawInRect:fromRect:operation:fraction:respectFlipped:hints:]
                                    4 -[NSImage _usingBestRepresentationForRect:context:hints:body:]
                                      4 __-[NSImage drawInRect:fromRect:operation:fraction:respectFlipped:hints:]_block_invoke_1
                                        4 -[NSImageRep drawInRect:fromRect:operation:fraction:respectFlipped:hints:]
                                          3 __-[NSImageRep drawInRect:fromRect:operation:fraction:respectFlipped:hints:]_block_invoke_1
                                            2 CGContextDrawImage
                                              2 ripc_DrawImage
                                                1 ripc_DrawImage
                                                1 ripc_RenderImage
                                                  1 ripl_BltImage
                                                    1 ripd_Mark
                                                      1 argb32_image
                                                        1 _blt_image_initialize
                                            1 -[NSCGImageSnapshotRep _snapshotRep_CGImageForProposedRect:context:hints:]
                                          1 -[NSImageRep _processedHintsForHints:includeOnlyIfAvailable:]
                                            1 objc_msgSend
                                2 objc_msgSend
                        3 0x1000908e5
                          3 __compare_and_swap64
                        2 0x10009090b
                          2 CFAbsoluteTimeGetCurrent
                        2 NSPushAutoreleasePool
                          2 objc_collectingEnabled
                        1 0x100090a07
                          1 -[NSView visibleRect]
                            1 objc_msgSend
                        1 0x100090a9f
                          1 ripc_Operation
                            1 CGSDeviceSynchronize
                              1 _CGSFlushRegionInline
                                1 mach_msg
                                  1 mach_msg_trap
    7346 Thread_129130
      7346 start_wqthread
        7346 _pthread_wqthread
          7346 __workq_kernreturn

Total number in stack (recursive counted multiple, when >=5):
        6       _pthread_start
        6       thread_start

Sort by top of stack, same collapsed (when >= 5):
        mach_msg_trap        22023
        __semwait_signal        14692
        __workq_kernreturn        7346
        kevent        7346
        select$DARWIN_EXTSN        7346
        0x4fc30a442f43        3274
        0x4fc30a442f3b        1390
        0x4fc30a442f6b        1362
        0x4fc30a442f70        655
        0x4fc30a442f76        440
        0x4fc30a442f7b        225

[Alexey Proskuryakov]

Hang at cnn.com is tracked by bug 46049.

[Chris Petersen]

With Webkit NB r68077, this issue is fixed.