EXC_BAD_ACCESS (SIGSEGV) On OSX 10.9.2 With Qt Application - macos

Question

I build OSX wallets for various cryptocurrencies and use QT 4.8.5 to build them.
One of the users of my .app files recently sent me these error logs which appear when he tries to open any of the apps I built on his system. He did appear to be a one off case so I assumed something was wrong with his system but someone else posted another log citing the same issue. I cannot seem to pinpoint the issue. Any ideas on what's wrong?
Process: FairCoin-Qt [42516]
Path: /Users/USER/Downloads/FairCoin-Qt 3.app/Contents/MacOS/FairCoin-Qt
Identifier: com.yourcompany.FairCoin-Qt
Version: ???
Code Type: X86-64 (Native)
Parent Process: launchd [145]
Responsible: FairCoin-Qt [42516]
User ID: 501
Date/Time: 2014-04-17 11:04:09.485 +0200
OS Version: Mac OS X 10.9.2 (13C64)
Report Version: 11
Anonymous UUID: 61FC4C8C-2509-6D30-A775-5C3E7F320AB1
Sleep/Wake UUID: CEC509C8-BC3E-4170-8656-A3B9499E5BB9
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
VM Regions Near 0:
-->
__TEXT 0000000100000000-0000000100540000 [ 5376K] r-x/rwx SM=COQ /Users/USER/Downloads/FairCoin-Qt 3.app/Contents/MacOS/FairCoin-Qt
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 QtGui 0x0000000109ebb570 QApplication::setActiveWindow(QWidget*) + 400
1 QtGui 0x0000000109e4fe94 onApplicationWindowChangedActivation(QWidget*, bool) + 100
2 com.apple.CoreFoundation 0x00007fff8cb3ce0c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
3 com.apple.CoreFoundation 0x00007fff8ca30a6d _CFXNotificationPost + 2893
4 com.apple.Foundation 0x00007fff8bb297ba -[NSNotificationCenter postNotificationName:object:userInfo:] + 68
5 QtGui 0x0000000100a3e12b QWidgetPrivate::setParent_sys(QWidget*, QFlags<Qt::WindowType>) + 5163
6 com.apple.AppKit 0x00007fff91e36a67 _NXShowKeyAndMain + 171
7 com.apple.AppKit 0x00007fff91cd3ad6 -[NSApplication sendEvent:] + 7127
8 QtGui 0x0000000100a4b8b2 QMacInputContext::reset() + 45538
9 com.apple.AppKit 0x00007fff91b22b89 -[NSApplication run] + 646
10 QtGui 0x0000000100a541bf QDesktopWidget::resizeEvent(QResizeEvent*) + 3887
11 QtGui 0x0000000100a55de1 QDesktopWidget::resizeEvent(QResizeEvent*) + 11089
12 QtCore 0x00000001016e8d35 QCoreApplication::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 69
13 QtGui 0x0000000100af77cf QWidgetPrivate::show_helper() + 639
14 QtGui 0x0000000100af7a1f QWidget::setVisible(bool) + 511
15 com.yourcompany.FairCoin-Qt 0x000000010002b022 main + 7794
16 com.yourcompany.FairCoin-Qt 0x0000000100027fd8 start + 52
Thread 1:
0 libsystem_kernel.dylib 0x00007fff90c3be6a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff97dcff08 _pthread_wqthread + 330
2 libsystem_pthread.dylib 0x00007fff97dd2fb9 start_wqthread + 13
Thread 2:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x00007fff90c3c662 kevent64 + 10
1 libdispatch.dylib 0x00007fff8a7b243d _dispatch_mgr_invoke + 239
2 libdispatch.dylib 0x00007fff8a7b2152 _dispatch_mgr_thread + 52
Thread 3:
0 libsystem_kernel.dylib 0x00007fff90c3be6a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff97dcff08 _pthread_wqthread + 330
2 libsystem_pthread.dylib 0x00007fff97dd2fb9 start_wqthread + 13
Thread 4:
0 libsystem_kernel.dylib 0x00007fff90c3be6a __workq_kernreturn + 10
1 libsystem_pthread.dylib 0x00007fff97dcff08 _pthread_wqthread + 330
2 libsystem_pthread.dylib 0x00007fff97dd2fb9 start_wqthread + 13
Thread 5:
0 libsystem_kernel.dylib 0x00007fff90c37a1a mach_msg_trap + 10
1 libsystem_kernel.dylib 0x00007fff90c36d18 mach_msg + 64
2 com.apple.CoreFoundation 0x00007fff8ca91155 __CFRunLoopServiceMachPort + 181
3 com.apple.CoreFoundation 0x00007fff8ca90779 __CFRunLoopRun + 1161
4 com.apple.CoreFoundation 0x00007fff8ca900b5 CFRunLoopRunSpecific + 309
5 com.apple.AppKit 0x00007fff91ccf16e _NSEventThread + 144
6 libsystem_pthread.dylib 0x00007fff97dce899 _pthread_body + 138
7 libsystem_pthread.dylib 0x00007fff97dce72a _pthread_start + 137
8 libsystem_pthread.dylib 0x00007fff97dd2fc9 thread_start + 13
Thread 0 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x00007fff5fbff660 rcx: 0x0000000101c66130 rdx: 0x0000000000000002
rdi: 0x00007fff5fbff660 rsi: 0x0000000000000001 rbp: 0x00007fff5fbfe880 rsp: 0x00007fff5fbfe7e0
r8: 0x0000000106ea5410 r9: 0x0000000000000011 r10: 0x0000000101b4a1d0 r11: 0x00007fff7ab45c88
r12: 0x00000000000f4282 r13: 0x00007fff5fbfea80 r14: 0x00007fff5fbff660 r15: 0x000000010a6e8418
rip: 0x0000000109ebb570 rfl: 0x0000000000010202 cr2: 0x0000000000000000
Logical CPU: 1
Error Code: 0x00000004
Trap Number: 14
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 1
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 126855
thread_create: 2
thread_set_state: 0
VM Region Summary:
ReadOnly portion of Libraries: Total=200.9M resident=76.7M(38%) swapped_out_or_unallocated=124.3M(62%)
Writable regions: Total=75.9M written=4632K(6%) resident=10.2M(13%) swapped_out=1224K(2%) unallocated=65.7M(87%)
REGION TYPE VIRTUAL
=========== =======
CG backing stores 452K
CG shared images 172K
CoreServices 1068K
Dispatch continuations 8192K
Kernel Alloc Once 8K
MALLOC 38.8M
MALLOC (admin) 32K
Memory Tag 242 12K
STACK GUARD 56.0M
Stack 10.1M
VM_ALLOCATE 16.3M
__DATA 20.9M
__IMAGE 528K
__LINKEDIT 73.9M
__TEXT 127.0M
__UNICODE 544K
mapped file 82.0M
shared memory 4K
=========== =======
TOTAL 435.9M
I've cut out the binaries loaded part to trim the error down to size but you can find the full error log and the rest of the error logs here:
FairCoin-Qt
CannaCoin-Qt

Answer 1

I know it's been a while but I just dealt with an essentially identical error. Long story short, this was caused by a collision between two versions of Qt. There are several possible causes:
The most common seems to be a plugin with its own version of Qt.
In my case, it was an issue where PyInstaller wasn't getting my application pointed to the included version of Qt so it was conflicting with the general installation in my Library.
I actually removed my install of Qt to confirm that this was actually the issue (the app ran fine afterwards). By extension, you'd only see the issue among customers who have an installation of Qt.
Two ways users can diagnose the issue:
Open the .app folder and navigate down to Contents/MacOS. Run the program from this location. You'll get a terminal showing errors like these: http://www.pyinstaller.org/ticket/472.
Confirm the presence of a Qt install. (Temporarily) move the Qt Libraries and see if the app runs successfully.