[Interest] Crash on Mac

Thu Jan 23 16:05:15 CET 2014

Hi all,

whenever we call QDialog::exec(), the app crashes (see the attached crash report + lldb dumps). 
We use Qt 5.2
It crashes only on one particular machine, it runs on another machine without any problems.
I really don't know what is wrong (it seems it has something to do with the accessibility events handling, but we didn't do anything special with accessibility)

Date/Time:       2014-01-23 08:42:51.559 +0100
OS Version:      Mac OS X 10.9.1 (13B42)
Report Version:  11
Anonymous UUID:  B524C2F7-2C97-E23E-D37D-E57B85E65AFF

Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Exception Type:  EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000000

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libQt5Gui.5.dylib                         0x00cd5418 QAccessible::registerAccessibleInterface(QAccessibleInterface*) + 24
1   libQt5Gui.5.dylib                         0x00cd5566 QAccessible::uniqueId(QAccessibleInterface*) + 70
2   libqcocoa.dylib                             0x05faf00d QCocoaAccessibility::notifyAccessibilityUpdate(QAccessibleEvent*) + 29
3   libQt5Gui.5.dylib                         0x00cd6697 QAccessible::updateAccessibility(QAccessibleEvent*) + 103
4   libQt5Widgets.5.dylib               0x011ff64e QWidgetWindow::event(QEvent*) + 1118
5   libQt5Widgets.5.dylib               0x01197c8c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 188
6   libQt5Widgets.5.dylib               0x011a0a73 QApplication::notify(QObject*, QEvent*) + 1635
7   libQt5Core.5.dylib                      0x0092135c QCoreApplication::notifyInternal(QObject*, QEvent*) + 108
8   libQt5Gui.5.dylib                         0x00cf0eaa QGuiApplicationPrivate::processActivatedEvent(QWindowSystemInterfacePrivate::ActivatedWindowEvent*) + 298
9   libQt5Gui.5.dylib                         0x00cf8854 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 1908
10  libQt5Gui.5.dylib                        0x00cde5a4 QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 52
11  libqcocoa.dylib                           0x05f9a5cf QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) + 31
12  com.apple.CoreFoundation                  0x991dee3f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
13  com.apple.CoreFoundation                  0x991cfccb __CFRunLoopDoSources0 + 235
14  com.apple.CoreFoundation                  0x991cf3ce __CFRunLoopRun + 1022
15  com.apple.CoreFoundation                  0x991ced5a CFRunLoopRunSpecific + 394
16  com.apple.CoreFoundation                  0x991cebbb CFRunLoopRunInMode + 123
17  com.apple.HIToolbox              0x98c1ce2d RunCurrentEventLoopInMode + 259
18  com.apple.HIToolbox              0x98c1ca47 ReceiveNextEventCommon + 163
19  com.apple.HIToolbox              0x98c1c98d _BlockUntilNextEventMatchingListInModeWithFilter + 92
20  com.apple.AppKit                     0x902be5a9 _DPSNextEvent + 1602
21  com.apple.AppKit                     0x902bdad0 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 119
22  com.apple.AppKit                     0x9063beac -[NSApplication _realDoModalLoop:peek:] + 828
23  com.apple.AppKit                     0x9063bb5d -[NSApplication _doModalLoop:peek:] + 209
24  com.apple.AppKit                     0x90679efd -[NSApplication runModalSession:] + 118
25  libqcocoa.dylib                           0x05f9ad3f QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 1871
26  libQt5Core.5.dylib                     0x0091ffb7 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 39
27  libQt5Core.5.dylib                     0x009205ef QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 207
28  libQt5Widgets.5.dylib              0x013a9883 QDialog::exec() + 547

(lldb) register read
General Purpose Registers:
eax = 0x00000000
ebx = 0x00cd5414
ecx = 0xffffffff
edx = 0xbfffc3bc
edi = 0x00000000
esi = 0xbfffc46c
ebp = 0xbfffc3c8
esp = 0xbfffc390
ss = 0x00000023
eflags = 0x00210286
eip = 0x00cd5418
cs = 0x0000001b
ds = 0x00000023
es = 0x00000023
fs = 0x00000000
gs = 0x0000000f

 (lldb) di -f
libQt5Gui.5.dylib`QAccessible::registerAccessibleInterface(QAccessibleInterface*):
0xcd5400:  pushl  %ebp
0xcd5401:  movl   %esp, %ebp
0xcd5403:  subl   $56, %esp
0xcd5406:  movl   %ebx, -12(%ebp)
0xcd5409:  movl   %esi, -8(%ebp)
0xcd540c:  movl   %edi, -4(%ebp)
0xcd540f:  calll  0xcd5414                  ; QAccessible::registerAccessibleInterface(QAccessibleInterface*) + 20
0xcd5414:  popl   %ebx
0xcd5415:  movl   8(%ebp), %edi
-> 0xcd5418:  movl   (%edi), %eax
0xcd541a:  movl   12(%eax), %eax
0xcd541d:  movl   %edi, (%esp)
0xcd5420:  calll  *%eax
0xcd5422:  movl   %eax, %esi
0xcd5424:  movl   3761368(%ebx), %eax
0xcd542a:  testl  %eax, %eax
0xcd542c:  jns    0xcd544f                  ; QAccessible::registerAccessibleInterface(QAccessibleInterface*) + 79
0xcd542e:  movl   %edi, 8(%esp)
0xcd5432:  movl   %esi, 4(%esp)
0xcd5436:  movl   3761440(%ebx), %eax
0xcd543c:  movl   %eax, (%esp)
0xcd543f:  calll  0xcd8a60                  ; QAccessibleCache::insert(QObject*, QAccessibleInterface*) const
0xcd5444:  movl   -12(%ebp), %ebx
0xcd5447:  movl   -8(%ebp), %esi
0xcd544a:  movl   -4(%ebp), %edi
0xcd544d:  leave  
0xcd544e:  ret    

Stanislav Kolář | Research & Development
Kerio Technologies
Anglické nábřeží 1, 301 00  Plzeň
Tel: +420 377 338 901

Social collaboration reinvented.
http://www.samepage.io
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