Computer Shut down on its own

My MacBook Pro shut down unexpetedly while in the middle of using it. I grey screen cam up with a prompt saying,
"Your computer restarted because of a problem. Press a key or wait a few seconds to continue starting up." After a moment, the computer continues starting up. "
I have included the most recent system diagnostic report below. Can anyone see what the problem might be?
MAny thanks
Date/Time:       2014-05-06 17:40:44 +0100
OS Version:      10.9.2 (Build 13C1021)
Architecture:    x86_64
Report Version:  18
Command:         com.apple.WebKit.WebContent
Path:            /System/Library/PrivateFrameworks/WebKit2.framework/Versions/A/XPCServices/com. apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent
Version:         9537 (9537.75.14)
Build Version:   6
Project Name:    WebKit2
Source Version:  7537075014000000
Parent:          launchd [1]
Responsible:     Safari [13017]
PID:             13110
Event:           wakeups (microstackshots only)
Wakeups:         348 wakeups per second for 130 seconds
Duration:        130.00s
Steps:           129
Hardware model:  MacBookPro9,2
Active cpus:     4
Fan speed:       2001 rpm
Powerstats for:  com.apple.WebKit [13110]
Start time:      2014-05-06 17:40:45 +0100
End time:        2014-05-06 17:42:53 +0100
Parent:          launchd
Responsible:     Safari
Microstackshots: 107 samples (82%)
Primary state:   68 samples Non-Frontmost App, Non-Background Priority, User mode
User Activity:   0 samples Idle, 107 samples Active
Power Source:    107 samples on Battery, 0 samples on AC
  107 start + 1 (libdyld.dylib) [0x7fff909f25fd]
    107 ??? (com.apple.WebKit.WebContent + 2976) [0x105291ba0]
      107 xpc_main + 399 (libxpc.dylib) [0x7fff8fc4fbde]
        107 _xpc_main + 385 (XPCService) [0x7fff8c1a7c0f]
          107 NSApplicationMain + 940 (AppKit) [0x7fff918fa913]
            107 -[NSApplication run] + 553 (AppKit) [0x7fff9190fb2c]
              107 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 (AppKit) [0x7fff9191ba2b]
                107 _DPSNextEvent + 1434 (AppKit) [0x7fff9191c3de]
                  107 _BlockUntilNextEventMatchingListInModeWithFilter + 65 (HIToolbox) [0x7fff8f9bf5bc]
                    107 ReceiveNextEventCommon + 479 (HIToolbox) [0x7fff8f9bf7b7]
                      107 RunCurrentEventLoopInMode + 226 (HIToolbox) [0x7fff8f9bfa0d]
                        107 CFRunLoopRunSpecific + 309 (CoreFoundation) [0x7fff8da8df25]
                          98  __CFRunLoopRun + 1525 (CoreFoundation) [0x7fff8da8e755]
                            96  __CFRunLoopDoTimers + 298 (CoreFoundation) [0x7fff8db445aa]
                              92  __CFRunLoopDoTimer + 1151 (CoreFoundation) [0x7fff8dad2fcf]
                                92  __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20 (CoreFoundation) [0x7fff8dad3494]
                                  92  WebCore::timerFired(__CFRunLoopTimer*, void*) + 58 (WebCore) [0x7fff90acedea]
                                    66  WebCore::setSharedTimerFireInterval(double) + 33 (WebCore) [0x7fff90ace801]
                                      40  CFRunLoopTimerInvalidate + 399 (CoreFoundation) [0x7fff8dacea4f]
                                        30  CFRunLoopRemoveTimer + 237 (CoreFoundation) [0x7fff8dace80d]
                                          29  mk_timer_arm + 10 (libsystem_kernel.dylib) [0x7fff8ae2cb5e]
                                            29  <Kernel mode>
                                          1   mk_timer_arm + 3 (libsystem_kernel.dylib) [0x7fff8ae2cb57]
                                        4   CFRunLoopRemoveTimer + 109 (CoreFoundation) [0x7fff8dace78d]
                                          3   __CFRunLoopFindMode + 223 (CoreFoundation) [0x7fff8da6b28f]
                                            2   CFSetGetValue + 111 (CoreFoundation) [0x7fff8da537af]
                                              1   CFEqual + 1 (CoreFoundation) [0x7fff8da3cb21]
                                              1   CFBasicHashFindBucket + 3528 (CoreFoundation) [0x7fff8da28998]
                                                1   CFEqual + 355 (CoreFoundation) [0x7fff8da3cc83]
                                                  1   __CFRunLoopModeEqual + 17 (CoreFoundation) [0x7fff8da7b271]
                                                    1   CFEqual + 560 (CoreFoundation) [0x7fff8da3cd50]
                                            1   CFSetGetValue + 4 (CoreFoundation) [0x7fff8da53744]
                                          1   object_setClass + 1 (libobjc.A.dylib) [0x7fff92a7dd1d]
                                        2   CFRunLoopRemoveTimer + 188 (CoreFoundation) [0x7fff8dace7dc]
                                          1   CFBasicHashRemoveValue + 2468 (CoreFoundation) [0x7fff8da530f4]
                                          1   CFBasicHashRemoveValue + 75 (CoreFoundation) [0x7fff8da5279b]
                                        1   DYLD-STUB$$pthread_mutex_lock + 6 (CoreFoundation) [0x7fff8dbc0874]
                                        1   CFRunLoopRemoveTimer + 229 (CoreFoundation) [0x7fff8dace805]
                                          1   _CFArrayReplaceValues + 468 (CoreFoundation) [0x7fff8da56264]
                                            1   __CFArrayReleaseValues + 263 (CoreFoundation) [0x7fff8da77e57]
                                              1   __CFTypeCollectionRelease + 26 (CoreFoundation) [0x7fff8da557da]
                                        1   CFRunLoopRemoveTimer + 249 (CoreFoundation) [0x7fff8dace819]
                                          1   pthread_mutex_unlock + 21 (libsystem_pthread.dylib) [0x7fff88d138cc]
                                            1   _pthread_mutex_check_init + 18 (libsystem_pthread.dylib) [0x7fff88d139a8]
                                        1   CFRunLoopRemoveTimer + 138 (CoreFoundation) [0x7fff8dace7aa]
                                          1   CFArrayGetCount + 19 (CoreFoundation) [0x7fff8da36a63]
                                      22  CFRunLoopTimerInvalidate + 433 (CoreFoundation) [0x7fff8dacea71]
                                        10  CFRunLoopRemoveTimer + 343 (CoreFoundation) [0x7fff8dace877]
                                          8   CFSetApplyFunction + 173 (CoreFoundation) [0x7fff8da7c3ed]
                                            7   CFBasicHashApply + 124 (CoreFoundation) [0x7fff8da609ac]
                                              7   __CFSetApplyFunction_block_invoke + 18 (CoreFoundation) [0x7fff8da7c432]
                                                3   CFRunLoopRemoveTimer + 109 (CoreFoundation) [0x7fff8dace78d]
                                                  3   __CFRunLoopFindMode + 223 (CoreFoundation) [0x7fff8da6b28f]
                                                    2   CFSetGetValue + 111 (CoreFoundation) [0x7fff8da537af]
                                                      1   CFBasicHashFindBucket + 3528 (CoreFoundation) [0x7fff8da28998]
                                                        1   CFEqual + 355 (CoreFoundation) [0x7fff8da3cc83]
                                                          1   __CFRunLoopModeEqual + 17 (CoreFoundation) [0x7fff8da7b271]
                                                            1   CFEqual + 285 (CoreFoundation) [0x7fff8da3cc3d]
                                                      1   CFBasicHashFindBucket + 54 (CoreFoundation) [0x7fff8da27c06]
                                                    1   CFSetGetValue + 149 (CoreFoundation) [0x7fff8da537d5]
                                                2   CFRunLoopRemoveTimer + 154 (CoreFoundation) [0x7fff8dace7ba]
                                                  1   CFArrayGetFirstIndexOfValue + 246 (CoreFoundation) [0x7fff8da36eb6]
                                                  1   CFArrayGetFirstIndexOfValue + 211 (CoreFoundation) [0x7fff8da36e93]
                                                    1   CFArrayGetValueAtIndex + 195 (CoreFoundation) [0x7fff8da4a4a3]
                                                1   CFRunLoopRemoveTimer + 80 (CoreFoundation) [0x7fff8dace770]
                                                  1   _pthread_mutex_lock + 630 (libsystem_pthread.dylib) [0x7fff88d1387b]
                                                1   CFRunLoopRemoveTimer + 374 (CoreFoundation) [0x7fff8dace896]
                                                  1   pthread_mutex_unlock + 60 (libsystem_pthread.dylib) [0x7fff88d138f3]
                                                    1   __mtx_droplock + 12 (libsystem_pthread.dylib) [0x7fff88d132ca]
                                            1   CFBasicHashGetElements + 288 (CoreFoundation) [0x7fff8da4b400]
                                          1   CFBasicHashApply + 1 (CoreFoundation) [0x7fff8da60931]
                                          1   CFSetApplyFunction + 18 (CoreFoundation) [0x7fff8da7c352]
                                        7   CFRunLoopRemoveTimer + 351 (CoreFoundation) [0x7fff8dace87f]
                                          6   CFRelease + 424 (CoreFoundation) [0x7fff8da37448]
                                            2   __CFBasicHashDrain + 589 (CoreFoundation) [0x7fff8da465ed]
                                              1   malloc_zone_free + 46 (libsystem_malloc.dylib) [0x7fff86e4acbc]
                                              1   szone_free + 165 (libsystem_malloc.dylib) [0x7fff86e3d3f3]
                                            1   __CFBasicHashDrain + 230 (CoreFoundation) [0x7fff8da46486]
                                            1   __CFBasicHashDrain + 408 (CoreFoundation) [0x7fff8da46538]
                                              1   CFRelease + 154 (CoreFoundation) [0x7fff8da3733a]
                                            1   __CFBasicHashDrain + 400 (CoreFoundation) [0x7fff8da46530]
                                              1   CFGetAllocator + 126 (CoreFoundation) [0x7fff8da221ae]
                                            1   __CFAllocatorSystemDeallocate + 1 (CoreFoundation) [0x7fff8da39cc1]
                                          1   CFRelease + 1097 (CoreFoundation) [0x7fff8da376e9]
                                            1   szone_free + 57 (libsystem_malloc.dylib) [0x7fff86e3d387]
                                        5   CFRunLoopRemoveTimer + 296 (CoreFoundation) [0x7fff8dace848]
                                          5   CFSetCreateCopy + 174 (CoreFoundation) [0x7fff8da7c1ae]
                                            3   CFBasicHashCreateCopy + 346 (CoreFoundation) [0x7fff8da6125a]
                                              1   _CFRuntimeCreateInstance + 73 (CoreFoundation) [0x7fff8da20fe9]
                                              1   _CFRuntimeCreateInstance + 253 (CoreFoundation) [0x7fff8da2109d]
                                                1   malloc_zone_malloc + 71 (libsystem_malloc.dylib) [0x7fff86e4a868]
                                                  1   szone_malloc_should_clear + 56 (libsystem_malloc.dylib) [0x7fff86e482bb]
                                              1   _class_getVariable + 111 (libobjc.A.dylib) [0x7fff92a7dd1c]
                                            2   CFBasicHashCreateCopy + 1296 (CoreFoundation) [0x7fff8da61610]
                                              2   malloc_zone_malloc + 71 (libsystem_malloc.dylib) [0x7fff86e4a868]
                                                2   szone_malloc_should_clear + 320 (libsystem_malloc.dylib) [0x7fff86e483c3]
                                                  2   tiny_malloc_from_free_list + 46 (libsystem_malloc.dylib) [0x7fff86e47cc2]
                                      1   CFRunLoopTimerInvalidate + 241 (CoreFoundation) [0x7fff8dace9b1]
                                        1   CFSetGetCount + 87 (CoreFoundation) [0x7fff8da76fd7]
                                      1   CFRunLoopTimerInvalidate + 312 (CoreFoundation) [0x7fff8dace9f8]
                                        1   CFRetain + 27 (CoreFoundation) [0x7fff8da24a8b]
                                      1   CFRunLoopTimerInvalidate + 394 (CoreFoundation) [0x7fff8dacea4a]
                                      1   CFRunLoopTimerInvalidate + 285 (CoreFoundation) [0x7fff8dace9dd]
                                        1   CFSetGetValues + 371 (CoreFoundation) [0x7fff8da934c3]
                                    20  WebCore::ThreadTimers::sharedTimerFiredInternal() + 175 (WebCore) [0x7fff90acef0f]
                                      17  WebCore::DOMTimer::fired() + 304 (WebCore) [0x7fff90d0ea50]
                                        17  WebCore::ScheduledAction::execute(WebCore::Document*) + 151 (WebCore) [0x7fff90d0ecc7]
                                          16  WebCore::ScheduledAction::executeFunctionInContext(JSC::JSGlobalObject*, JSC::JSValue, WebCore::ScriptExecutionContext*) + 450 (WebCore) [0x7fff90d0ef62]
                                            16  WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 154 (WebCore) [0x7fff90cca82a]
                                              16  JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 69 (JavaScriptCore) [0x7fff9010c7b5]
                                                14  JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 595 (JavaScriptCore) [0x7fff9010ca13]
                                                  9   ??? [0x45d4ae401045]
                                                    9   WebCore::jsDOMWindowPrototypeFunctionSetTimeout(JSC::ExecState*) + 165 (WebCore) [0x7fff90cb1bc5]
                                                      8   WebCore::JSDOMWindow::setTimeout(JSC::ExecState*) + 310 (WebCore) [0x7fff90cb1d16]
                                                        8   WebCore::DOMWindow::setTimeout(***::PassOwnPtr<WebCore::ScheduledAction>, int, int&) + 64 (WebCore) [0x7fff90cb21c0]
                                                          8   WebCore::DOMTimer::install(WebCore::ScriptExecutionContext*, ***::PassOwnPtr<WebCore::ScheduledAction>, int, bool) + 85 (WebCore) [0x7fff90cb2265]
                                                            6   WebCore::DOMTimer::DOMTimer(WebCore::ScriptExecutionContext*, ***::PassOwnPtr<WebCore::ScheduledAction>, int, bool) + 326 (WebCore) [0x7fff90cb2446]
                                                              6   WebCore::stopSharedTimer() + 21 (WebCore) [0x7fff90ace1c5]
                                                                4   CFRunLoopTimerInvalidate + 399 (CoreFoundation) [0x7fff8dacea4f]
                                                                  1   CFRunLoopRemoveTimer + 249 (CoreFoundation) [0x7fff8dace819]
                                                                    1   pthread_mutex_unlock + 21 (libsystem_pthread.dylib) [0x7fff88d138cc]
                                                                      1   _pthread_mutex_check_init + 18 (libsystem_pthread.dylib) [0x7fff88d139a8]
                                                                  1   CFRunLoopRemoveTimer + 384 (CoreFoundation) [0x7fff8dace8a0]
                                                                  1   CFRunLoopRemoveTimer + 237 (CoreFoundation) [0x7fff8dace80d]
                                                                    1   mk_timer_arm + 10 (libsystem_kernel.dylib) [0x7fff8ae2cb5e]
                                                                      1   <Kernel mode>
                                                                  1   CFRunLoopRemoveTimer + 188 (CoreFoundation) [0x7fff8dace7dc]
                                                                    1   CFBasicHashRemoveValue + 3392 (CoreFoundation) [0x7fff8da53490]
                                                                      1   __CFBasicHashRemoveValue + 153 (CoreFoundation) [0x7fff8da555f9]
                                                                        1   CFGetAllocator + 88 (CoreFoundation) [0x7fff8da22188]
                                                                2   CFRunLoopTimerInvalidate + 433 (CoreFoundation) [0x7fff8dacea71]
                                                                  2   CFRunLoopRemoveTimer + 351 (CoreFoundation) [0x7fff8dace87f]
                                                                    1   CFRelease + 284 (CoreFoundation) [0x7fff8da373bc]
                                                                    1   CFRelease + 424 (CoreFoundation) [0x7fff8da37448]
                                                                      1   __CFBasicHashDrain + 589 (CoreFoundation) [0x7fff8da465ed]
                                                                        1   szone_free + 946 (libsystem_malloc.dylib) [0x7fff86e3d700]
                                                            1   WebCore::DOMTimer::DOMTimer(WebCore::ScriptExecutionContext*, ***::PassOwnPtr<WebCore::ScheduledAction>, int, bool) + 42 (WebCore) [0x7fff90cb232a]
                                                              1   WebCore::SuspendableTimer::SuspendableTimer(WebCore::ScriptExecutionContext*) + 22 (WebCore) [0x7fff90af57b6]
                                                            1   WebCore::DOMTimer::DOMTimer(WebCore::ScriptExecutionContext*, ***::PassOwnPtr<WebCore::ScheduledAction>, int, bool) + 245 (WebCore) [0x7fff90cb23f5]
                                                              1   ***::HashTableAddResult<***::HashTableIterator<int, ***::KeyValuePair<int, WebCore::DOMTimer*>, ***::KeyValuePairKeyExtractor<***::KeyValuePair<int, WebCore::DOMTimer*> >, ***::IntHash<unsigned int>, ***::HashMapValueTraits<***::HashTraits<int>, ***::HashTraits<WebCore::DOMTimer*> >, ***::HashTraits<int> > > ***::HashTable<int, ***::KeyValuePair<int, WebCore::DOMTimer*>, ***::KeyValuePairKeyExtractor<***::KeyValuePair<int, WebCore::DOMTimer*> >, ***::IntHash<unsigned int>, ***::HashMapValueTraits<***::HashTraits<int>, ***::HashTraits<WebCore::DOMTimer*> >, ***::HashTraits<int> >::add<***::HashMapTranslator<***::HashMapValueTraits<***::HashTraits<int>, ***::HashTraits<WebCore::DOMTimer*> >, ***::IntHash<unsigned int> >, int, WebCore::DOMTimer*>(int const&, WebCore::DOMTimer* const&) + 676 (WebCore) [0x7fff90cec614]
                                                                1   ***::fastFree(void*) + 171 (JavaScriptCore) [0x7fff90099acb]
                                                      1   WebCore::JSDOMWindow::setTimeout(JSC::ExecState*) + 89 (WebCore) [0x7fff90cb1c39]
                                                        1   WebCore::ScheduledAction::create(JSC::ExecState*, WebCore::DOMWrapperWorld*, WebCore::ContentSecurityPolicy*) + 111 (WebCore) [0x7fff90cb1dcf]
                                                  2   ??? [0x45d4ae408d47]
                                                    2   linkFor + 214 (JavaScriptCore) [0x7fff90238e46]
                                                      1   handleHostCall + 94 (JavaScriptCore) [0x7fff902cef2e]
                                                      1   handleHostCall + 244 (JavaScriptCore) [0x7fff902cefc4]
                                                        1   JSC::constructWithDateConstructor(JSC::ExecState*) + 44 (JavaScriptCore) [0x7fff90198cfc]
                                                          1   JSC::constructDate(JSC::ExecState*, JSC::JSGlobalObject*, JSC::ArgList const&) + 97 (JavaScriptCore) [0x7fff90198d71]
                                                            1   ***::currentTime() + 19 (JavaScriptCore) [0x7fff900973e3]
                                                              1   mig_allocate + 69 (libsystem_kernel.dylib) [0x7fff8ae2cbb0]
                                                  1   ??? [0x45d4ae40ab07]
                                                    1   operationRegExpTest + 60 (JavaScriptCore) [0x7fff902215dc]
                                                  1   ??? [0x45d4ae45ac2a]
                                                    1   operationRegExpTest + 157 (JavaScriptCore) [0x7fff9022163d]
                                                      1   JSC::RegExpObject::match(JSC::ExecState*, JSC::JSString*) + 403 (JavaScriptCore) [0x7fff90151d23]
                                                        1   ??? [0x45d4ae421c81]
                                                  1   WebCore::Location::protocol() const + 224 (WebCore) [0x7fff90cb1b20]
                                                1   JSC::Watchdog::Scope::~Scope() + 1 (JavaScriptCore) [0x7fff9010b701]
                                                1   ***::wtfThreadData() + 1 (JavaScriptCore) [0x7fff900a8cc1]
                                          1   WebCore::ScheduledAction::executeFunctionInContext(JSC::JSGlobalObject*, JSC::JSValue, WebCore::ScriptExecutionContext*) + 642 (WebCore) [0x7fff90d0f022]
                                            1   JSC::JSLockHolder::~JSLockHolder() + 131 (JavaScriptCore) [0x7fff900ac0f3]
                                              1   pthread_mutex_unlock + 60 (libsystem_pthread.dylib) [0x7fff88d138f3]
                                                1   __mtx_droplock + 343 (libsystem_pthread.dylib) [0x7fff88d13415]
                                      2   WebCore::DOMTimer::fired() + 293 (WebCore) [0x7fff90d0ea45]
                                        1   ***::TCMalloc_ThreadCache::Deallocate(***::HardenedSLL, unsigned long) + 328 (JavaScriptCore) [0x7fff9009b728]
                                        1   WebCore::DOMTimer::~DOMTimer() + 14 (WebCore) [0x7fff90cfa63e]
                                          1   WebCore::DOMTimer::~DOMTimer() + 49 (WebCore) [0x7fff90cfa681]
                                            1   WebCore::ScriptExecutionContext::removeTimeout(int) + 154 (WebCore) [0x7fff90cfa76a]
                                              1   ***::fastZeroedMalloc(unsigned long) + 1 (JavaScriptCore) [0x7fff900970a1]
                                      1   WebCore::DOMTimer::fired() + 242 (WebCore) [0x7fff90d0ea12]
                                        1   WebCore::ScheduledAction::execute(WebCore::Document*) + 151 (WebCore) [0x7fff90d0ecc7]
                                          1   WebCore::ScheduledAction::executeFunctionInContext(JSC::JSGlobalObject*, JSC::JSValue, WebCore::ScriptExecutionContext*) + 450 (WebCore) [0x7fff90d0ef62]
                                            1   WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 154 (WebCore) [0x7fff90cca82a]
                                              1   JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 69 (JavaScriptCore) [0x7fff9010c7b5]
                                                1   JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 595 (JavaScriptCore) [0x7fff9010ca13]
                                                  1   ??? [0x45d4ae506990]
                                    2   WebCore::setSharedTimerFireInterval(double) + 116 (WebCore) [0x7fff90ace854]
                                      2   CFRunLoopAddTimer + 427 (CoreFoundation) [0x7fff8da95bfb]
                                        2   CFSetApplyFunction + 173 (CoreFoundation) [0x7fff8da7c3ed]
                                          2   CFBasicHashApply + 124 (CoreFoundation) [0x7fff8da609ac]
                                            2   __CFSetApplyFunction_block_invoke + 18 (CoreFoundation) [0x7fff8da7c432]
                                              2   CFRunLoopAddTimer + 573 (CoreFoundation) [0x7fff8da95c8d]
                                                2   __CFRepositionTimerInMode + 127 (CoreFoundation) [0x7fff8da95def]
                                                  2   mk_timer_arm + 10 (libsystem_kernel.dylib) [0x7fff8ae2cb5e]
                                                    2   <Kernel mode>
                                    1   WebCore::ThreadTimers::sharedTimerFiredInternal() + 166 (WebCore) [0x7fff90acef06]
                                      1   WebCore::TimerBase::setNextFireTime(double) + 140 (WebCore) [0x7fff90acbd8c]
                                        1   WebCore::DOMTimer::alignedFireTime(double) const + 23 (WebCore) [0x7fff90cb25f7]
                                          1   non-virtual thunk to WebCore::Document::timerAlignmentInterval() const + 20 (WebCore) [0x7fff90cb2674]
                                    1   WebCore::ThreadTimers::sharedTimerFiredInternal() + 132 (WebCore) [0x7fff90aceee4]
                                      1   WebCore::TimerBase::heapDeleteMin() + 14 (WebCore) [0x7fff90acefce]
                                        1   WebCore::TimerBase::heapPopMin() + 47 (WebCore) [0x7fff90acf02f]
                                    1   WebCore::setSharedTimerFireInterval(double) + 50 (WebCore) [0x7fff90ace812]
                                      1   CFAbsoluteTimeGetCurrent + 32 (CoreFoundation) [0x7fff8da72ba0]
                                    1   WebCore::ThreadTimers::sharedTimerFiredInternal() + 236 (WebCore) [0x7fff90acef4c]
                                      1   ***::monotonicallyIncreasingTime() + 30 (JavaScriptCore) [0x7fff9009f00e]
                                        1   mach_absolute_time + 23 (libsystem_kernel.dylib) [0x7fff8ae2bca3]
                              2   __CFRunLoopDoTimer + 461 (CoreFoundation) [0x7fff8dad2d1d]
                                2   mk_timer_arm + 10 (libsystem_kernel.dylib) [0x7fff8ae2cb5e]
                                  2   <Kernel mode>
                              1   __CFRunLoopDoTimer + 1220 (CoreFoundation) [0x7fff8dad3014]
                                1   CFRunLoopTimerInvalidate + 163 (CoreFoundation) [0x7fff8dace963]
                                  1   _pthread_mutex_lock + 54 (libsystem_pthread.dylib) [0x7fff88d1363b]
                              1   __getpeername + 24 (libsystem_kernel.dylib) [0x7fff8ae30130]
                            1   __CFRunLoopDoTimers + 181 (CoreFoundation) [0x7fff8db44535]
                              1   +[NSObject alloc] + 7 (libobjc.A.dylib) [0x7fff92a93485]
                            1   __CFRunLoopDoTimers + 195 (CoreFoundation) [0x7fff8db44543]
                              1   CFArrayAppendValue + 148 (CoreFoundation) [0x7fff8da49ef4]
                                1   -[__NSPlaceholderArray initWithObjects:count:] + 384 (CoreFoundation) [0x7fff8da24a70]
                          4   __CFRunLoopRun + 1161 (CoreFoundation) [0x7fff8da8e5e9]
                            2   __CFRunLoopServiceMachPort + 181 (CoreFoundation) [0x7fff8da8efc5]
                              2   mach_msg_trap + 10 (libsystem_kernel.dylib) [0x7fff8ae2ca1a]
                                2   <Kernel mode>
                            1   __CFRunLoopServiceMachPort + 183 (CoreFoundation) [0x7fff8da8efc7]
                            1   __CFRunLoopServiceMachPort + 288 (CoreFoundation) [0x7fff8da8f030]
                          2   __CFRunLoopRun + 944 (CoreFoundation) [0x7fff8da8e510]
                            2   __CFRunLoopServiceMachPort + 181 (CoreFoundation) [0x7fff8da8efc5]
                              2   mach_msg_trap + 10 (libsystem_kernel.dylib) [0x7fff8ae2ca1a]
                                2   <Kernel mode>
                          1   __CFRunLoopRun + 1636 (CoreFoundation) [0x7fff8da8e7c4]
                            1   __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 (CoreFoundation) [0x7fff8dad35a9]
                              1   _dispatch_main_queue_callback_4CF + 244 (libdispatch.dylib) [0x7fff86b6aeaa]
                                1   _dispatch_mach_invoke + 154 (libdispatch.dylib) [0x7fff86b6669e]
                                  1   _dispatch_queue_drain + 359 (libdispatch.dylib) [0x7fff86b65633]
                                    1   _dispatch_mach_msg_invoke + 143 (libdispatch.dylib) [0x7fff86b673b8]
                                      1   _dispatch_client_callout4 + 9 (libdispatch.dylib) [0x7fff86b66afe]
                                        1   _xpc_connection_mach_event + 2124 (libxpc.dylib) [0x7fff8fc461df]
                                          1   _xpc_connection_call_event_handler + 58 (libxpc.dylib) [0x7fff8fc475cc]
                                            1   ??? (com.apple.WebKit.WebContent + 3285) [0x105291cd5]
                                              1   WebContentServiceInitializer + 32 (WebKit2) [0x7fff8aa93188]
                                                1   WebKit::EnvironmentUtilities::stripValuesEndingWithString(char const*, char const*) + 90 (WebKit2) [0x7fff8aa931f1]
                                                  1   ***::Vector<char, 0ul, ***::CrashOnOverflow>::grow(unsigned long) + 62 (WebKit2) [0x7fff8aa93368]
                                                    1   ***::Vector<char, 0ul, ***::CrashOnOverflow>::reserveCapacity(unsigned long) + 36 (WebKit2) [0x7fff8aa93396]
                                                      1   ***::VectorBufferBase<char>::allocateBuffer(unsigned long) + 29 (WebKit2) [0x7fff8aa933fb]
                                                        1   ***::fastMallocGoodSize(unsigned long) + 24 (JavaScriptCore) [0x7fff9009b8a8]
                                                          1   ***::TCMalloc_ThreadCache::InitModule() + 474 (JavaScriptCore) [0x7fff9009517a]
                                                            1   <Kernel mode>
                          1   __CFRunLoopRun + 831 (CoreFoundation) [0x7fff8da8e49f]
                            1   __CFRunLoopDoSources0 + 107 (CoreFoundation) [0x7fff8da8ec8b]
                              1   CFSetApplyFunction + 173 (CoreFoundation) [0x7fff8da7c3ed]
                                1   CFBasicHashApply + 75 (CoreFoundation) [0x7fff8da6097b]
                          1   __CFRunLoopRun + 1268 (CoreFoundation) [0x7fff8da8e654]
                            1   OSAtomicCompareAndSwap64Barrier$VARIANT$up + 16 (libsystem_platform.dylib) [0x7fff86290bcc]
  Binary Images:
         0x105291000 -        0x105291ff4  com.apple.WebKit.WebContent 9537 (9537.75.14) <B6BACFDC-3742-3AD9-AE7F-2DA7D2025DD7> /System/Library/PrivateFrameworks/WebKit2.framework/Versions/A/XPCServices/com. apple.WebKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent
      0x7fff8628e000 -     0x7fff86294ff7  libsystem_platform.dylib (24.90.1) <3C3D3DA8-32B9-3243-98EC-D89B9A1670B3> /usr/lib/system/libsystem_platform.dylib
      0x7fff86b62000 -     0x7fff86b7cfff  libdispatch.dylib (339.90.1) <F3CBFE1B-FCE8-3F33-A53D-9092AB382DBB> /usr/lib/system/libdispatch.dylib
      0x7fff86e3a000 -     0x7fff86e55ff7  libsystem_malloc.dylib (23.10.1) <A695B4E4-38E9-332E-A772-29D31E3F1385> /usr/lib/system/libsystem_malloc.dylib
      0x7fff88d0f000 -     0x7fff88d16ff7  libsystem_pthread.dylib (53.1.4) <AB498556-B555-310E-9041-F67EC9E00E2C> /usr/lib/system/libsystem_pthread.dylib
      0x7fff8aa6f000 -     0x7fff8ac60ff3  com.apple.WebKit2 9537 (9537.75.14) <A54F32B2-5D0D-3A1D-A1F6-FB2162BD50D1> /System/Library/PrivateFrameworks/WebKit2.framework/Versions/A/WebKit2
      0x7fff8ae1b000 -     0x7fff8ae37ff7  libsystem_kernel.dylib (2422.92.1) <3F649963-7FA1-3201-8FF6-8438A52B9973> /usr/lib/system/libsystem_kernel.dylib
      0x7fff8c1a6000 -     0x7fff8c1acff7  com.apple.XPCService 2.0 (1) <2CE632D7-FE57-36CF-91D4-C57D0F2E0BFE> /System/Library/PrivateFrameworks/XPCService.framework/Versions/A/XPCService
      0x7fff8da1e000 -     0x7fff8dc03fff  com.apple.CoreFoundation 6.9 (855.16) <A63E680E-E4B2-368B-8564-9DBE0D8DDB91> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
      0x7fff8f991000 -     0x7fff8fc3bff5  com.apple.HIToolbox 2.1 <DF5635DD-C255-3A8E-8B49-F6D2FB61FF95> /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.fra mework/Versions/A/HIToolbox
      0x7fff8fc3c000 -     0x7fff8fc60fff  libxpc.dylib (300.90.2) <AB40CD57-F454-3FD4-B415-63B3C0D5C624> /usr/lib/system/libxpc.dylib
      0x7fff90093000 -     0x7fff9040aff6  com.apple.JavaScriptCore 9537 (9537.75.12) <DC1116A7-934C-37C1-9AB2-354DBA43EAD7> /System/Library/Frameworks/JavaScriptCore.framework/Versions/A/JavaScriptCore
      0x7fff909ef000 -     0x7fff909f2ff7  libdyld.dylib (239.4) <CF03004F-58E4-3BB6-B3FD-BE4E05F128A0> /usr/lib/system/libdyld.dylib
      0x7fff90aa5000 -     0x7fff918f7ff7  com.apple.WebCore 9537 (9537.75.14) <8C80717D-91D3-32D5-92F4-804AC1D1E881> /System/Library/Frameworks/WebKit.framework/Versions/A/Frameworks/WebCore.frame work/Versions/A/WebCore
      0x7fff918f8000 -     0x7fff9246efff  com.apple.AppKit 6.9 (1265.19) <12647F2F-3FE2-3D77-B3F0-33EFAFF2CEA7> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
      0x7fff92a76000 -     0x7fff92c23f27  libobjc.A.dylib (551.1) <AD7FD984-271E-30F4-A361-6B20319EC73B> /usr/lib/libobjc.A.dylib
Powerstats for:  com.apple.WebKit
Start time:      2014-05-06 17:40:46 +0100
End time:        2014-05-06 17:42:01 +0100
Microstackshots: 16 samples (12%)
Primary state:   9 samples Non-Frontmost App, Non-Background Priority, User mode
User Activity:   0 samples Idle, 16 samples Active
Power Source:    16 samples on Battery, 0 samples on AC
  11 thread_start + 13 (libsystem_pthread.dylib) [0x7fff88d14fc9]
    11 _pthread_start + 137 (libsystem_pthread.dylib) [0x7fff88d1072a]
      11 _pthread_body + 138 (libsystem_pthread.dylib) [0x7fff88d10899]
        8  __NSThread__main__ + 1318 (Foundation) [0x7fff856c276b]
          8  +[NSURLConnection(Loader) _resourceLoadLoop:] + 348 (Foundation) [0x7fff856c2967]
            7  CFRunLoopRunSpecific + 309 (CoreFoundation) [0x7fff8da8df25]
              6  __CFRunLoopRun + 831 (CoreFoundation) [0x7fff8da8e49f]
                5  __CFRunLoopDoSources0 + 242 (CoreFoundation) [0x7fff8da8ed12]
                  5  __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 (CoreFoundation) [0x7fff8da9d661]
                    5  __CFSocketPerformV0 + 855 (CoreFoundation) [0x7fff8dadd107]
                      5  SocketStream::_SocketCallBack_stream(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 64 (CFNetwork) [0x7fff8a6fb062]
                        5  SocketStream::socketCallback(__CFSocket*, unsigned long, __CFData const*, void const*) + 206 (CFNetwork) [0x7fff8a6fb160]
                          5  SocketStream::dispatchSignalFromSocketCallbackUnlocked(SocketStreamSignalHolder *) + 74 (CFNetwork) [0x7fff8a6fba32]
                            4  CoreStreamBase::_streamSetEventAndScheduleDelivery(unsigned long, unsigned char) + 183 (CFNetwork) [0x7fff8a6fbca9]
                              4  CoreStreamBase::_callClientNow(CoreStreamClient*) + 53 (CFNetwork) [0x7fff8a82fa65]
                                4  CoreReadStreamClient::coreStreamEventsAvailable(unsigned long) + 53 (CFNetwork) [0x7fff8a6fbf89]
                                  4  HTTPReadFilter::_httpRdFilterStreamCallBack(__CoreReadStream*, unsigned long, void*) + 118 (CFNetwork) [0x7fff8a72901a]
                                    2  HTTPReadFilter::socketReadStreamCallback(unsigned long) + 810 (CFNetwork) [0x7fff8a729354]
                                      2  CoreStreamBase::_streamSetEventAndScheduleDelivery(unsigned long, unsigned char) + 78 (CFNetwork) [0x7fff8a6fbc40]
                                        2  CoreStreamBase::copySchedulingSet() const + 48 (CFNetwork) [0x7fff8a82f7a6]
                                          2  CoreSchedulingSet::create(__CFRunLoop*, __CFString const*) + 61 (CFNetwork) [0x7fff8a6f9429]
                                            1  CoreSchedulingSet::copyOrCreate(CoreSchedulingItem const*) + 196 (CFNetwork) [0x7fff8a6f9594]
                                              1  cfTypeCreateArray(__CFAllocator const*, ...) + 228 (CFNetwork) [0x7fff8a6f06ea]
                                                1  CFArrayCreateMutable + 132 (CoreFoundation) [0x7fff8da36274]
                                                  1  -[__NSPlaceholderArray initWithCapacity:] + 117 (CoreFoundation) [0x7fff8da2cd05]
                                                    1  +[__NSArrayM __new:::::] + 60 (CoreFoundation) [0x7fff8da2cdcc]
                                                      1  __CFAllocateObject2 + 15 (CoreFoundation) [0x7fff8da2465f]
                                                        1  class_createInstance + 104 (libobjc.A.dylib) [0x7fff92a7c87c]
                                                          1  calloc + 49 (libsystem_malloc.dylib) [0x7fff86e4b2ca]
                                                            1  malloc_zone_calloc + 79 (libsystem_malloc.dylib) [0x7fff86e4ab61]
                                                              1  szone_malloc_should_clear + 56 (libsystem_malloc.dylib) [0x7fff86e482bb]
                                            1  CoreSchedulingSet::copyOrCreate(CoreSchedulingItem const*) + 37 (CFNetwork) [0x7fff8a6f94f5]
                                              1  CFAllocatedObject::operator new(unsigned long, __CFAllocator const*) + 23 (CFNetwork) [0x7fff8a6f115b]
                                                1  malloc_zone_malloc + 115 (libsystem_malloc.dylib) [0x7fff86e4a894]
                                    2  HTTPReadFilter::socketReadStreamCallback(unsigned long) + 214 (CFNetwork) [0x7fff8a729100]
                                      2  HTTPReadFilter::_streamImpl_CanRead() + 218 (CFNetwork) [0x7fff8a728eec]
                                        2  HTTPReadFilter::canReadNoSignal(StreamReader*, CFStreamError*, unsigned char) + 407 (CFNetwork) [0x7fff8a7285b5]
                                          2  CoreStreamBase::_streamInterface_CanRead() + 42 (CFNetwork) [0x7fff8a6fca6e]
                                            2  non-virtual thunk to CoreReadStreamWithCallBacks::_streamImpl_CanRead() + 32 (CFNetwork) [0x7fff8a6fca9c]
                                              1  ReadStreamCallbacks::_canRead(__CoreReadStream*, void*) + 36 (CFNetwork) [0x7fff8a6fcaca]
                                              1  ReadStreamCallbacks::_canRead(__CoreReadStream*, void*) + 30 (CFNetwork) [0x7fff8a6fcac4]
                                                1  non-virtual thunk to SocketStream::canRead(__CoreReadStream*) + 16 (CFNetwork) [0x7fff8a6fcada]
                                                  1  SocketStream::canRead(__CoreReadStream*) + 33 (CFNetwork) [0x7fff8a6fcb01]
                                                    1  _pthread_mutex_lock + 286 (libsystem_pthread.dylib) [0x7fff88d13723]
                            1  CoreStreamBase::_streamSetEventAndScheduleDelivery(unsigned long, unsigned char) + 324 (CFNetwork) [0x7fff8a6fbd36]
                              1  CoreSchedulingSet::~CoreSchedulingSet() + 15 (CFNetwork) [0x7fff8a6f9b69]
                                1  CoreSchedulingSet::~CoreSchedulingSet() + 188 (CFNetwork) [0x7fff8a6f9c54]
                                  1  CFRelease + 591 (CoreFoundation) [0x7fff8da374ef]
                                    1  -[NSObject release] + 14 (libobjc.A.dylib) [0x7fff92a933fe]
                                      1  _objc_rootReleaseWasZero + 112 (libobjc.A.dylib) [0x7fff92a7ca0c]
                                        1  objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::find(objc_object* const&) + 35 (libobjc.A.dylib) [0x7fff92a9361b]
                                          1  bool objc::DenseMapBase<objc::DenseMap<objc_object*, unsigned long, true, objc::DenseMapInfo<objc_object*> >, objc_object*, unsigned long, objc::DenseMapInfo<objc_object*>, true>::LookupBucketFor<objc_object*>(objc_object* const&, std::__1::pair<objc_object*, unsigned long> const*&) const + 73 (libobjc.A.dylib) [0x7fff92a9380d]
                1  __CFRunLoopDoSources0 + 441 (CoreFoundation) [0x7fff8da8edd9]
                  1  __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 (CoreFoundation) [0x7fff8da9d661]
                    1  __CFSocketPerformV0 + 673 (CoreFoundation) [0x7fff8dadd051]
                      1  SocketStream::_SocketCallBack_stream(__CFSocket*, unsigned long, __CFData const*, void const*, void*) + 64 (CFNetwork) [0x7fff8a6fb062]
                        1  SocketStream::socketCallback(__CFSocket*, unsigned long, __CFData const*, void const*) + 131 (CFNetwork) [0x7fff8a6fb115]
                          1  SocketStream::socketCallbackConnectLocked(SocketStreamSignalHolder*, void const*) + 395 (CFNetwork) [0x7fff8a6fb301]
                            1  SocketStream::addNetworkReachability_NoLock() + 163 (CFNetwork) [0x7fff8a6fb3df]
                              1  SocketStream::Reachability::schedule(dispatch_queue_s*) + 115 (CFNetwork) [0x7fff8a6fb7ed]
                                1  SCNetworkReachabilitySetDispatchQueue + 102 (SystemConfiguration) [0x7fff8b36f79e]
                                  1  __SCNetworkReachabilityScheduleWithRunLoop + 323 (SystemConfiguration) [0x7fff8b36e63c]
                                    1  __SCNetworkReachabilityServer_targetSchedule + 150 (SystemConfiguration) [0x7fff8b36edbb]
                                      1  _reach_server_target_schedule + 112 (SystemConfiguration) [0x7fff8b36f009]
                                        1  xpc_connection_send_message_with_reply_sync + 180 (libxpc.dylib) [0x7fff8fc467e0]
                                          1  _xpc_connection_send_message_with_reply_f + 125 (libxpc.dylib) [0x7fff8fc46920]
                                            1  dispatch_mach_send + 136 (libdispatch.dylib) [0x7fff86b66e99]
                                              1  _dispatch_mach_msg_send + 332 (libdispatch.dylib) [0x7fff86b67031]
                                                1  mach_msg_trap + 10 (libsystem_kernel.dylib) [0x7fff8ae2ca1a]
                                                  1  <Kernel mode>
              1  __CFRunLoopRun + 1340 (CoreFoundation) [0x7fff8da8e69c]
            1  CFRunLoopRunSpecific + 102 (CoreFoundation) [0x7fff8da8de56]
              1  __CFRunLoopFindMode + 223 (CoreFoundation) [0x7fff8da6b28f]
                1  CFSetGetValue + 111 (CoreFoundation) [0x7fff8da537af]
                  1  CFBasicHashFindBucket + 1032 (CoreFoundation) [0x7fff8da27fd8]
                    1  CFHash + 162 (CoreFoundation) [0x7fff8da2fa82]
        3  __select + 10 (libsystem_kernel.dylib) [0x7fff8ae309aa]
          3  <Kernel mode>
  3  start + 1 (libdyld.dylib) [0x7fff909f25fd]
    3  ??? (com.apple.WebKit.WebContent + 2976) [0x108071ba0]
      3  xpc_main + 399 (libxpc.dylib) [0x7fff8fc4fbde]
        3  _xpc_main + 385 (XPCService) [0x7fff8c1a7c0f]
          3  NSApplicationMain + 940 (AppKit) [0x7fff918fa913]
            3  -[NSApplication run] + 553 (AppKit) [0x7fff9190fb2c]
              3  -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 (AppKit) [0x7fff9191ba2b]
                3  _DPSNextEvent + 1434 (AppKit) [0x7fff9191c3de]
                  3  _BlockUntilNextEventMatchingListInModeWithFilter + 65 (HIToolbox) [0x7fff8f9bf5bc]
                    3  ReceiveNextEventCommon + 479 (HIToolbox) [0x7fff8f9bf7b7]
                      3  RunCurrentEventLoopInMode + 226 (HIToolbox) [0x7fff8f9bfa0d]
                        3  CFRunLoopRunSpecific + 309 (CoreFoundation) [0x7fff8da8df25]
                          2  __CFRunLoopRun + 831 (CoreFoundation) [0x7fff8da8e49f]
                            2  __CFRunLoopDoSources0 + 242 (CoreFoundation) [0x7fff8da8ed12]
                              2  __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 (CoreFoundation) [0x7fff8da9d661]
                                2  WebCore::RunLoop::performWork(void*) + 34 (WebCore) [0x7fff90ad0862]
                                  2  WebCore::RunLoop::performWork() + 557 (WebCore) [0x7fff90ad0aad]
                                    2  CoreIPC::Connection::dispatchOneMessage() + 106 (WebKit2) [0x7fff8aa9b402]
                                      2  CoreIPC::Connection::dispatchMessage(***::PassOwnPtr<CoreIPC::MessageDecoder>) + 101 (WebKit2) [0x7fff8aa9b4d9]
                                        2  WebKit::NetworkProcessConnection::didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageDecoder&) + 138 (WebKit2) [0x7fff8aabf7e4]
                                          2  WebKit::WebResourceLoader::didReceiveWebResourceLoaderMessage(CoreIPC::Connecti on*, CoreIPC::MessageDecoder&) + 510 (WebKit2) [0x7fff8aabff86]
                                            2  void CoreIPC::handleMessage<Messages::WebResourceLoader::DidReceiveResource, WebKit::WebResourceLoader, void (WebKit::WebResourceLoader::*)(WebKit::ShareableResource::Handle const&, double)>(CoreIPC::MessageDecoder&, WebKit::WebResourceLoader*, void (WebKit::WebResourceLoader::*)(WebKit::ShareableResource::Handle const&, double)) + 88 (WebKit2) [0x7fff8aad62f9]
                                              2  WebKit::WebResourceLoader::didReceiveResource(WebKit::ShareableResource::Handle const&, double) + 166 (WebKit2) [0x7fff8aad6432]
                                                2  WebCore::SubresourceLoader::didFinishLoading(double) + 133 (WebCore) [0x7fff90c00195]
                                                  2  WebCore::CachedResource::checkNotify() + 166 (WebCore) [0x7fff90c00436]
                                                    2 

It sounds like you are having kernel panics. Open your Console application. Under "System Diagnostics Reports," look for a log file name "kernel....xxx" ending in ".panic"....Find the most recent, copy the whole kernel panic report, and post the output in your reply.

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    These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.
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