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macOS Crash when using OpenMP and Qt

M

mpcoder

macrumors newbie
Original poster
Mar 21, 2009
16
0
Hi,

I'm trying to parallelize a number-crunching part of an application to make use of a quad-core architecture using OpenMP and GCC 4.2. But what I think the problem is that this application uses Qt for the GUI and I'm trying to fork the worker threads on a secondary thread created by Qt which causes the program to crash - but of this I'm not sure.

I'm seriously on the dark here since it's my first time working with either Qt or OpenMP, (or C++ for that matter). Any sort of guidance is greatly appreciated.

Thank you,

JM
 
Code: 
Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000008
Crashed Thread:  8

Thread 0:
0   libSystem.B.dylib             	0x94c54266 mach_msg_trap + 10
1   libSystem.B.dylib             	0x94c5ba5c mach_msg + 72
2   com.apple.CoreGraphics        	0x90e2bb37 _CGSTerminateWindowList + 214
3   com.apple.CoreGraphics        	0x90e2b4b2 _CGSReleaseWindowList + 452
4   com.apple.CoreGraphics        	0x90e2b2e6 CGSReleaseWindow + 370
5   com.apple.HIToolbox           	0x91680705 DisposePlatformWindow + 91
6   com.apple.HIToolbox           	0x917554ab WindowData::~WindowData() + 709
7   com.apple.HIToolbox           	0x9175b7a1 HIViewWrapperDef::~HIViewWrapperDef() + 37
8   com.apple.HIToolbox           	0x91605768 HIObject::HandleClassHIObjectEvent(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 274
9   com.apple.HIToolbox           	0x916055d3 HIObject::EventHook(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 55
10  com.apple.HIToolbox           	0x9160513d DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1181
11  com.apple.HIToolbox           	0x9160457b SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 405
12  com.apple.HIToolbox           	0x916043e0 SendEventToEventTargetWithOptions + 58
13  com.apple.HIToolbox           	0x91643e22 HIObject::Destruct() + 186
14  com.apple.HIToolbox           	0x9167f8a9 WindowData::Destruct() + 697
15  com.apple.CoreFoundation      	0x976d0516 _CFRelease + 182
16  QtGui                         	0x01d00769 qt_mac_destructWindow(OpaqueWindowPtr*) + 41
17  QtGui                         	0x01d02f0d QWidget::destroy(bool, bool) + 557
18  QtGui                         	0x01db87c1 QWidget::~QWidget() + 449
19                                	0x0004f461 ParamsFileDialog::~ParamsFileDialog() + 77
20                                	0x00012a80 NucleusEditor::segmentNuclei() + 406
21                                	0x0004f32b NucleusEditor::qt_metacall(QMetaObject::Call, int, void**) + 2307
22  QtCore                        	0x028fb4bb QMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 523
23  QtGui                         	0x01d5c754 QAction::triggered(bool) + 68
24  QtGui                         	0x01d5ea0f QAction::activate(QAction::ActionEvent) + 159
25  QtGui                         	0x01d3cac9 qt_mac_activate_action(OpaqueMenuRef*, unsigned int, QAction::ActionEvent, bool) + 153
26  QtGui                         	0x01d3d129 qt_mac_menu_event(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 617
27  com.apple.HIToolbox           	0x9160513d DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1181
28  com.apple.HIToolbox           	0x9160457b SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 405
29  com.apple.HIToolbox           	0x91620ecc SendEventToEventTarget + 52
30  com.apple.HIToolbox           	0x916551e7 SendHICommandEvent(unsigned long, HICommand const*, unsigned long, unsigned long, unsigned char, OpaqueEventTargetRef*, OpaqueEventTargetRef*, OpaqueEventRef**) + 411
31  com.apple.HIToolbox           	0x9167b959 SendMenuCommandWithContextAndModifiers + 59
32  com.apple.HIToolbox           	0x9167b914 SendMenuItemSelectedEvent + 134
33  com.apple.HIToolbox           	0x9167b82a FinishMenuSelection(MenuData*, MenuData*, MenuResult*, MenuResult*, unsigned long, unsigned long, unsigned long, unsigned char) + 162
34  com.apple.HIToolbox           	0x91658494 MenuSelectCore(MenuData*, Point, double, unsigned long, OpaqueMenuRef**, unsigned short*) + 640
35  com.apple.HIToolbox           	0x916e7030 MenuSelect + 104
36  QtGui                         	0x01cfbeca QApplicationPrivate::globalEventProcessor(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 11898
37  com.apple.HIToolbox           	0x9160513d DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 1181
38  com.apple.HIToolbox           	0x9160457b SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 405
39  com.apple.HIToolbox           	0x91620ecc SendEventToEventTarget + 52
40  com.apple.HIToolbox           	0x91633603 ToolboxEventDispatcherHandler(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 2579
41  com.apple.HIToolbox           	0x916054f6 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 2134
42  com.apple.HIToolbox           	0x9160457b SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 405
43  com.apple.HIToolbox           	0x91620ecc SendEventToEventTarget + 52
44  QtGui                         	0x01d10e74 QEventDispatcherMac::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 596
45  QtCore                        	0x029d2801 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 65
46  QtCore                        	0x029d2a2d QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 189
47  QtCore                        	0x029d4d9e QCoreApplication::exec() + 174
48                                	0x000071f8 main + 426
49                                	0x00005b96 start + 54

Thread 1:
0   libSystem.B.dylib             	0x94c54266 mach_msg_trap + 10
1   libSystem.B.dylib             	0x94c5ba5c mach_msg + 72
2   com.apple.CoreFoundation      	0x976cde7e CFRunLoopRunSpecific + 1790
3   com.apple.CoreFoundation      	0x976ceb04 CFRunLoopRun + 84
4   com.apple.DesktopServices     	0x95575e17 TSystemNotificationTask::SystemNotificationTaskProc(void*) + 123
5   ...ple.CoreServices.CarbonCore	0x9727e057 PrivateMPEntryPoint + 56
6   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
7   libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 2:
0   libSystem.B.dylib             	0x94c54266 mach_msg_trap + 10
1   libSystem.B.dylib             	0x94c5ba5c mach_msg + 72
2   com.apple.CoreFoundation      	0x976cde7e CFRunLoopRunSpecific + 1790
3   com.apple.CoreFoundation      	0x976ceb04 CFRunLoopRun + 84
4   com.apple.DesktopServices     	0x95575f90 TFSEventsNotificationTask::FSEventsNotificationTaskProc(void*) + 216
5   ...ple.CoreServices.CarbonCore	0x9727e057 PrivateMPEntryPoint + 56
6   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
7   libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 3:
0   libSystem.B.dylib             	0x94c5b44e __semwait_signal + 10
1   libSystem.B.dylib             	0x94c85dcd pthread_cond_wait$UNIX2003 + 73
2   ...ple.CoreServices.CarbonCore	0x9727fe7f TSWaitOnCondition + 126
3   ...ple.CoreServices.CarbonCore	0x9725ecd2 TSWaitOnConditionTimedRelative + 202
4   ...ple.CoreServices.CarbonCore	0x9727fafc MPWaitOnQueue + 208
5   com.apple.DesktopServices     	0x95580f72 TNodeSyncTask::SyncTaskProc(void*) + 84
6   ...ple.CoreServices.CarbonCore	0x9727e057 PrivateMPEntryPoint + 56
7   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
8   libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 4:
0   libSystem.B.dylib             	0x94c849c6 kevent + 10
1   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
2   libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 5:
0   libSystem.B.dylib             	0x94ca36fa select$DARWIN_EXTSN + 10
1   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
2   libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 6:
0   libSystem.B.dylib             	0x94c542c6 semaphore_timedwait_signal_trap + 10
1   libSystem.B.dylib             	0x94c862af _pthread_cond_wait + 1244
2   libSystem.B.dylib             	0x94c87b33 pthread_cond_timedwait_relative_np + 47
3   ...ple.CoreServices.CarbonCore	0x9725ecfe TSWaitOnConditionTimedRelative + 246
4   ...ple.CoreServices.CarbonCore	0x9727fafc MPWaitOnQueue + 208
5   com.apple.DesktopServices     	0x95582ebc TFolderSizeTask::FolderSizeTaskProc(void*) + 104
6   ...ple.CoreServices.CarbonCore	0x9727e057 PrivateMPEntryPoint + 56
7   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
8   libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 7:
0   libSystem.B.dylib             	0x94c542c6 semaphore_timedwait_signal_trap + 10
1   libSystem.B.dylib             	0x94c862af _pthread_cond_wait + 1244
2   libSystem.B.dylib             	0x94c87b33 pthread_cond_timedwait_relative_np + 47
3   com.apple.Foundation          	0x91e73dbc -[NSCondition waitUntilDate:] + 236
4   com.apple.Foundation          	0x91e73bd0 -[NSConditionLock lockWhenCondition:beforeDate:] + 144
5   com.apple.Foundation          	0x91e73b35 -[NSConditionLock lockWhenCondition:] + 69
6   com.apple.AppKit              	0x9429e6e8 -[NSUIHeartBeat _heartBeatThread:] + 753
7   com.apple.Foundation          	0x91e2ddfd -[NSThread main] + 45
8   com.apple.Foundation          	0x91e2d9a4 __NSThread__main__ + 308
9   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
10  libSystem.B.dylib             	0x94c85012 thread_start + 34

Thread 8 Crashed:
0                                 	0x0000642a gomp_resolve_num_threads + 42
1                                 	0x000064b1 GOMP_parallel_start + 17
2                                 	0x00bb9e23 yousef_nucleus_seg::runBinarization() + 277
3                                 	0x007008ae ftk::NuclearSegmentation::Binarize(bool) + 480
4                                 	0x0004b654 ftk::ProjectProcessor::SegmentNuclei(int) + 774
5                                 	0x0004bd57 ftk::ProjectProcessor::ProcessNext() + 167
6                                 	0x00008435 ProcessThread::run() + 41
7   QtCore                        	0x0291835b QThreadPrivate::start(void*) + 187
8   libSystem.B.dylib             	0x94c85155 _pthread_start + 321
9   libSystem.B.dylib             	0x94c85012 thread_start + 34
 
Are the items/objects being used derived from a thread safe class?

What happens if you break down the problem and unit test only the MP part independent of Qt?
 
It works. The problem definitely is when forking OpenMP threads from a secondary QThread.
 
Did you define: QMAKE_CXXFLAGS += -fopenmp in your project's .pro file?

Does the same happen if you fork the openmp thread off in the qt main thread instead of a secondary one?
 
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