(gdb) bt full
#0  unlink_chunk (p=p@entry=0x55cf2cc449f0, av=0x7f014dda9b80 <main_arena>) at malloc.c:1459
        fd = 0x0
        bk = 0x55cf2cc447d0
#1  0x00007f014dc72d93 in malloc_consolidate (av=av@entry=0x7f014dda9b80 <main_arena>) at malloc.c:4494
        fb = 0x7f014dda9b98 <main_arena+24>
        maxfb = 0x7f014dda9bd8 <main_arena+88>
        p = 0x55cf2cc449f0
        nextp = 0x55cf2d8346c0
        unsorted_bin = 0x7f014dda9be0 <main_arena+96>
        first_unsorted = <optimized out>
        nextchunk = 0x55cf2cc44a70
        size = 128
        nextsize = 80
        prevsize = <optimized out>
        nextinuse = <optimized out>
#2  0x00007f014dc74290 in _int_free (av=0x7f014dda9b80 <main_arena>, p=0x55cf31c085c0,
    have_lock=<optimized out>) at malloc.c:4400
        size = 68432
        fb = <optimized out>
        nextchunk = 0x55cf31c15b00
        nextsize = 13840
        nextinuse = <optimized out>
        prevsize = <optimized out>
        bck = <optimized out>
        fwd = <optimized out>
        __PRETTY_FUNCTION__ = "_int_free"
#3  0x00007f014e96e0bd in QImageData::~QImageData() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
No symbol table info available.
#4  0x00007f014e96eb98 in QImage::~QImage() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
No symbol table info available.
#5  0x00007f014e9b228c in QRasterPlatformPixmap::~QRasterPlatformPixmap() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
No symbol table info available.
--Type <RET> for more, q to quit, c to continue without paging--
#6  0x00007f014e9b22a9 in QRasterPlatformPixmap::~QRasterPlatformPixmap() ()
   from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
No symbol table info available.
#7  0x00007f014e9aa5cc in QPixmap::~QPixmap() () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
No symbol table info available.
#8  0x00007f014e9b022f in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
No symbol table info available.
#9  0x00007f014eff562c in QApplication::~QApplication() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
No symbol table info available.
#10 0x000055cf2aaeabc9 in QtSingleApplication::~QtSingleApplication (this=0x7ffc5600a250,
    __in_chrg=<optimized out>) at lib/qtsingleapplication/qtsingleapplication.h:64
No locals.
#11 main (argc=<optimized out>, argv=<optimized out>) at main.cpp:200
        app = warning: RTTI symbol not found for class 'QApplication'
{<QApplication> = {<No data fields>}, static staticMetaObject = {d = {superdata = {
                direct = 0x7f014f4f55c0 <QApplication::staticMetaObject>},
              stringdata = 0x55cf2ae70de0 <qt_meta_stringdata_QtSingleApplication>,
              data = 0x55cf2ae70d20 <qt_meta_data_QtSingleApplication>,
              static_metacall = 0x55cf2adb5190 <QtSingleApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, peer = 0x55cf2cc3ee20, actWin = 0x7ffc5600a120}
        options = {_currentState = Options::STATE_INPUT_FILE,
          _inputFiles = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {
                  static shared_null = {ref = {atomic = {_q_value = {<std::__atomic_base<int>> = {
                            static _S_alignment = 4, _M_i = -1}, <No data fields>}}}, alloc = 0, begin = 0,
                    end = 0, array = {0x0}}, d = 0x7f014e482330 <QListData::shared_null>},
                d = 0x7f014e482330 <QListData::shared_null>}}, <No data fields>}, _outputFile = {
            static null = {<No data fields>}, d = 0x7f014e481860 <QArrayData::shared_null>},
          _outputDirectory = {static null = {<No data fields>}, d = 0x7f014e481860 <QArrayData::shared_null>},
          _mode = Options::MODE_GUI, _error = false, _help = false, _sf3Quality = 1, _sfzPresetPrefix = false,
          _sfzOneDirPerBank = false, _sfzGeneralMidi = false, _appPath = {static null = {<No data fields>},
            d = 0x55cf2cc38f30}}
        valRet = <optimized out>