My app crash randomly can anybody tell me why in a couple of words

this is error report, memory problems yeah? my program may crash at start or over some times of runtime, program opens file, and program crash at one of the file openings

calls from qt lldb 1

i dunno why it crash but it crash at file opening and stack calls every time differs

calls from qt lldb 2

 QString fileName = QFileDialog::getOpenFileName(this, tr("Load incidence matrix"), QDir::home().absolutePath(), tr("Incidence Matrix (*.txt);;All Files (*)"));
    if(fileName.isEmpty())
        return;
    QFile *file = new QFile(fileName);
    if(!file->open(QIODevice::ReadOnly))
    {
        QMessageBox::information(this, tr("Error at opening file"), file->errorString());
        appendConsole(tr("Error at opening file ") + fileName);
        return;
    }
    appendConsole(tr("File \"") + fileName + tr("\" reading success"));

Process:               lab4_graphs_main_terms [10383]
Path:                  /Users/USER/*/lab4_graphs_main_terms.app/Contents/MacOS/lab4_graphs_main_terms
Identifier:            troxycoru.lab4-graphs-main-terms
Version:               0
Code Type:             X86-64 (Native)
Parent Process:        ??? [1]
Responsible:           lab4_graphs_main_terms [10383]
User ID:               501

Date/Time:             2019-03-25 09:22:12.869 +1000
OS Version:            Mac OS X 10.14.3 (18D42)
Report Version:        12
Bridge OS Version:     3.0 (14Y674)
Anonymous UUID:        C5B29707-C3C2-5600-72D4-D4D0A644F37D

Sleep/Wake UUID:       7FDDF2B9-3E37-4554-B225-0B36DB0BA767

Time Awake Since Boot: 110000 seconds
Time Since Wake:       13000 seconds

System Integrity Protection: enabled

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

Exception Type:        EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes:       0x0000000000000001, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Illegal instruction: 4
Termination Reason:    Namespace SIGNAL, Code 0x4
Terminating Process:   exc handler [10383]

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_malloc.dylib          0x00007fff6a766a8e nanov2_allocate_from_block + 622
1   libsystem_malloc.dylib          0x00007fff6a7660f6 nanov2_allocate + 142
2   libsystem_malloc.dylib          0x00007fff6a766017 nanov2_malloc + 56
3   libsystem_malloc.dylib          0x00007fff6a759807 malloc_zone_malloc + 103
4   libsystem_malloc.dylib          0x00007fff6a759783 malloc + 24
5   libc++abi.dylib                 0x00007fff67cd0f48 operator new(unsigned long) + 40
6   org.qt-project.QtGui            0x0000000101fb44f7 QTextOption::operator=(QTextOption const&) + 55
7   org.qt-project.QtGui            0x0000000101fe6dba QTextDocumentLayoutPrivate::layoutBlock(QTextBlock const&, int, QTextBlockFormat const&, QTextLayoutStruct*, int, int, QTextBlockFormat const*) + 1114
8   org.qt-project.QtGui            0x0000000101fdf769 QTextDocumentLayoutPrivate::layoutFlow(QTextFrame::iterator, QTextLayoutStruct*, int, int, QFixed) + 2329
9   org.qt-project.QtGui            0x0000000101fe65ba QTextDocumentLayoutPrivate::layoutFrame(QTextFrame*, int, int, QFixed, QFixed, QFixed) + 1946
10  org.qt-project.QtGui            0x0000000101fe5de8 QTextDocumentLayoutPrivate::layoutFrame(QTextFrame*, int, int, QFixed) + 968
11  org.qt-project.QtGui            0x0000000101fe8dcf QTextDocumentLayout::doLayout(int, int, int) + 511
12  org.qt-project.QtGui            0x0000000101fe8791 QTextDocumentLayout::documentChanged(int, int, int) + 529
13  org.qt-project.QtGui            0x0000000101fc5017 QTextDocumentPrivate::finishEdit() + 199
14  org.qt-project.QtGui            0x0000000101ff5eb5 QTextCursor::endEditBlock() + 229
15  org.qt-project.QtWidgets        0x0000000101ae2d59 QWidgetTextControlPrivate::append(QString const&, Qt::TextFormat) + 265
16  org.qt-project.QtWidgets        0x0000000101aba673 QTextEdit::append(QString const&) + 83
17  troxycoru.lab4-graphs-main-terms    0x000000010189cbe1 MainWindow::appendConsole(QString) + 145 (mainwindow.cpp:20)
18  troxycoru.lab4-graphs-main-terms    0x00000001018a231c MainWindow::showGraph(AdjacencyMatrix*, unsigned int) + 14924 (mainwindow.cpp:601)
19  troxycoru.lab4-graphs-main-terms    0x000000010189c4fa MainWindow::open() + 1338 (mainwindow.cpp:834)
20  troxycoru.lab4-graphs-main-terms    0x00000001018aa0ae QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (MainWindow::*)()>::call(void (MainWindow::*)(), MainWindow*, void**) + 126 (qobjectdefs_impl.h:152)
21  troxycoru.lab4-graphs-main-terms    0x00000001018aa003 void QtPrivate::FunctionPointer<void (MainWindow::*)()>::call<QtPrivate::List<>, void>(void (MainWindow::*)(), MainWindow*, void**) + 99 (qobjectdefs_impl.h:186)
22  troxycoru.lab4-graphs-main-terms    0x00000001018a9ed6 QtPrivate::QSlotObject<void (MainWindow::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) + 166 (qobjectdefs_impl.h:415)
23  org.qt-project.QtCore           0x00000001025fb87b QMetaObject::activate(QObject*, int, int, void**) + 2219
24  org.qt-project.QtWidgets        0x00000001018e9c45 QAction::activate(QAction::ActionEvent) + 309
25  org.qt-project.QtCore           0x00000001025f42c1 QObject::event(QEvent*) + 753
26  org.qt-project.QtWidgets        0x00000001018f32cd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 269
27  org.qt-project.QtWidgets        0x00000001018f46d2 QApplication::notify(QObject*, QEvent*) + 594
28  org.qt-project.QtCore           0x00000001025caa04 QCoreApplication::notifyInternal2(QObject*, QEvent*) + 212
29  org.qt-project.QtCore           0x00000001025cbc3e QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 878
30  libqcocoa.dylib                 0x00000001044c1759 QCocoaEventDispatcherPrivate::processPostedEvents() + 313
31  libqcocoa.dylib                 0x00000001044c1fd0 QCocoaEventDispatcherPrivate::postedEventsSourceCallback(void*) + 32
32  com.apple.CoreFoundation        0x00007fff3d376475 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
33  com.apple.CoreFoundation        0x00007fff3d37641b __CFRunLoopDoSource0 + 108
34  com.apple.CoreFoundation        0x00007fff3d359eb5 __CFRunLoopDoSources0 + 195
35  com.apple.CoreFoundation        0x00007fff3d35945e __CFRunLoopRun + 1219
36  com.apple.CoreFoundation        0x00007fff3d358d48 CFRunLoopRunSpecific + 463
37  com.apple.HIToolbox             0x00007fff3c5efab5 RunCurrentEventLoopInMode + 293
38  com.apple.HIToolbox             0x00007fff3c5ef6f4 ReceiveNextEventCommon + 371
39  com.apple.HIToolbox             0x00007fff3c5ef568 _BlockUntilNextEventMatchingListInModeWithFilter + 64
40  com.apple.AppKit                0x00007fff3a8aa363 _DPSNextEvent + 997
41  com.apple.AppKit                0x00007fff3a8a9102 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 1362
42  com.apple.AppKit                0x00007fff3a8a3165 -[NSApplication run] + 699
43  libqcocoa.dylib                 0x00000001044c0e2b QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 2955
44  org.qt-project.QtCore           0x00000001025c606f QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 431
45  org.qt-project.QtCore           0x00000001025cb012 QCoreApplication::exec() + 130
46  troxycoru.lab4-graphs-main-terms    0x00000001018989b0 main + 96 (main.cpp:13)
47  libdyld.dylib                   0x00007fff6a5aaed9 start + 1

Thread 1:
0   libsystem_pthread.dylib         0x00007fff6a79d3f8 start_wqthread + 0
1   ???                             0x0000000054485244 0 + 1414025796

Thread 2:
0   libsystem_pthread.dylib         0x00007fff6a79d3f8 start_wqthread + 0
1   ???                             0x000060000218f080 0 + 105553151455360

Thread 3:: Dispatch queue: TBrowserViewDataSource
0   libsystem_kernel.dylib          0x00007fff6a6e77de __psynch_cvwait + 10
1   libsystem_pthread.dylib         0x00007fff6a7a1593 _pthread_cond_wait + 724
2   libc++.1.dylib                  0x00007fff67c7fbda std::__1::condition_variable::wait(std::__1::unique_lock<std::__1::mutex>&) + 18
3   com.apple.FinderKit             0x00007fff540c7011 void std::__1::condition_variable_any::wait<std::__1::mutex>(std::__1::mutex&) + 75
4   com.apple.FinderKit             0x00007fff540c61e3 TConditionVariable::Wait(std::__1::mutex&) + 29
5   com.apple.FinderKit             0x00007fff54247493 ModifyDataSourceOnMainThreadSync(FI_TBrowserViewDataSource*, FI_TBVDSChangedNotificationData*, std::__1::function<void ()> const&) + 393
6   com.apple.FinderKit             0x00007fff54243515 __44-[FI_TBrowserViewDataSource aboutToTearDown]_block_invoke + 328
7   libdispatch.dylib               0x00007fff6a55bd53 _dispatch_call_block_and_release + 12
8   libdispatch.dylib               0x00007fff6a55cdcf _dispatch_client_callout + 8
9   libdispatch.dylib               0x00007fff6a563124 _dispatch_lane_serial_drain + 618
10  libdispatch.dylib               0x00007fff6a563bdc _dispatch_lane_invoke + 388
11  libdispatch.dylib               0x00007fff6a56c090 _dispatch_workloop_worker_thread + 603
12  libsystem_pthread.dylib         0x00007fff6a79d60b _pthread_wqthread + 409
13  libsystem_pthread.dylib         0x00007fff6a79d405 start_wqthread + 13

Thread 4:
0   libsystem_pthread.dylib         0x00007fff6a79d3f8 start_wqthread + 0
1   ???                             0x00006000030882d0 0 + 105553167155920

Thread 5:: com.apple.NSEventThread
0   libsystem_kernel.dylib          0x00007fff6a6e417a mach_msg_trap + 10
1   libsystem_kernel.dylib          0x00007fff6a6e46d0 mach_msg + 60
2   com.apple.CoreFoundation        0x00007fff3d35a0c2 __CFRunLoopServiceMachPort + 337
3   com.apple.CoreFoundation        0x00007fff3d359611 __CFRunLoopRun + 1654
4   com.apple.CoreFoundation        0x00007fff3d358d48 CFRunLoopRunSpecific + 463
5   com.apple.AppKit                0x00007fff3a8b2f89 _NSEventThread + 160
6   libsystem_pthread.dylib         0x00007fff6a79e305 _pthread_body + 126
7   libsystem_pthread.dylib         0x00007fff6a7a126f _pthread_start + 70
8   libsystem_pthread.dylib         0x00007fff6a79d415 thread_start + 13

Thread 6:
0   libsystem_pthread.dylib         0x00007fff6a79d3f8 start_wqthread + 0
1   ???                             0x0000000000002d1f 0 + 11551

Thread 7:
0   libsystem_pthread.dylib         0x00007fff6a79d3f8 start_wqthread + 0
1   ???                             0x0000000000000300 0 + 768

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x5cb8665a41dd00e4  rbx: 0x0000000000000000  rcx: 0x00007fff6a6e40ae  rdx: 0x0000000000001000
  rdi: 0x0000000000000103  rsi: 0x0000000107407000  rbp: 0x00007ffeee367610  rsp: 0x00007ffeee3675b0
   r8: 0x0000000000000000   r9: 0x00007ffeee367350  r10: 0x000000010740708e  r11: 0x0000000000000246
  r12: 0x00000000b4c86aed  r13: 0x00000000000002ec  r14: 0x00000001029d7c58  r15: 0x0000600000db0000
  rip: 0x00007fff6a766a8e  rfl: 0x0000000000010206  cr2: 0x0000000107407000

Logical CPU: 0 Error Code: 0x00000000 Trap Number: 6

External Modification Summary: Calls made by other processes targeting this process: task_for_pid: 0 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: 64088 thread_create: 0 thread_set_state: 12355

VM Region Summary: ReadOnly portion of Libraries: Total=481.9M resident=0K(0%) swapped_out_or_unallocated=481.9M(100%) Writable regions: Total=624.6M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=624.6M(100%)

                            VIRTUAL   REGION 

REGION TYPE SIZE COUNT (non-coalesced) =========== ======= ======= Accelerate framework 384K 4 Activity Tracing 256K 2 CG backing stores 1032K 4 CG image 1140K 39 CG raster data 32K 5 CoreAnimation 16.2M 45 CoreGraphics 8K 2 CoreImage 172K 23 CoreServices 64K 2 CoreUI image data 2556K 31 CoreUI image file 380K 8 Foundation 4K 2 Kernel Alloc Once 8K 2 MALLOC 207.5M 38 MALLOC guard page 32K 9 MALLOC_NANO (reserved) 384.0M 2 reserved VM address space (unallocated) Memory Tag 242 12K 2 Memory Tag 251 72K 5 STACK GUARD 56.0M 9 Stack 11.6M 9 VM_ALLOCATE 328K 23 __DATA 39.2M 368 __FONT_DATA 4K 2 __LINKEDIT 219.3M 27 __TEXT 262.6M 364 __UNICODE 564K 2 mapped file 58.2M 55 shared memory 688K 17 =========== ======= ======= TOTAL 1.2G 1073 TOTAL, minus reserved VM space 878.2M 1073

Model: MacBookPro14,2, BootROM 184.0.0.0.0, 2 processors, Intel Core i5, 3,1 GHz, 8 GB, SMC 2.44f1 Graphics: Intel Iris Plus Graphics 650, Intel Iris Plus Graphics 650, Built-In Memory Module: BANK 0/DIMM0, 4 GB, LPDDR3, 2133 MHz, 0x80CE, 0x4B3445364533303445422D45474347202020 Memory Module: BANK 1/DIMM0, 4 GB, LPDDR3, 2133 MHz, 0x80CE, 0x4B3445364533303445422D45474347202020 AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x171), Broadcom BCM43xx 1.0 (7.77.61.1 AirPortDriverBrcmNIC-1305.2) Bluetooth: Version 6.0.10f1, 3 services, 27 devices, 1 incoming serial ports Network Service: Wi-Fi, AirPort, en0 USB Device: USB 3.0 Bus USB Device: iBridge Thunderbolt Bus: MacBook Pro, Apple Inc., 39.2 Thunderbolt Bus: MacBook Pro, Apple Inc., 39.2