Thread 1 (Thread 0x7fab8bf93780 (LWP 13210)):
#0  0x00007fab8aecabb9 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
        resultvar = 0
        pid = 13210
        selftid = 13210
#1  0x00007fab8aecdfc8 in __GI_abort () at abort.c:89
        save_stage = 2
        act = {__sigaction_handler = {sa_handler = 0x0, sa_sigaction = 0x0}, sa_mask = {__val = {0, 140736866556992, 140374762509655, 140733193388033, 0, 140374756045368, 140374746705192, 0, 140736866556992, 4197184, 140374762538261, 140736866557280, 140374747644848, 140736866557024, 140736866557280, 3}}, sa_flags = -1946601600, sa_restorer = 0x1da5f80}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007fab8b816ba1 in qt_message_fatal (context=..., message=...) at global/qlogging.cpp:1411
No locals.
#3  0x00007fab8b813442 in QMessageLogger::fatal (this=0x7fffdaf01d60, msg=0x7fab8bbcc210 "ASSERT failure in %s: \"%s\", file %s, line %d") at global/qlogging.cpp:639
        message = {static null = {<No data fields>}, d = 0x1da5c40}
        ap = {{gp_offset = 48, fp_offset = 48, overflow_arg_area = 0x7fffdaf01d40, reg_save_area = 0x7fffdaf01c80}}

#4  0x00007fab8b80d534 in qt_assert_x (where=0x7fab8bc83095 "QSettings", what=0x7fab8bc8308b "empty key", file=0x7fab8bc8307a "io/qsettings.cpp", line=236) at global/qglobal.cpp:2816
        __PRETTY_FUNCTION__ = "void qt_assert_x(const char*, const char*, const char*, int)"

#5  0x00007fab8ba0c513 in QSettingsPrivate::actualKey (this=0x1da5220, key=...) at io/qsettings.cpp:236
        n = {static null = {<No data fields>}, d = 0x1da50e0}

#6  0x00007fab8ba14629 in QSettings::value (this=0x7fffdaf01e40, key=..., defaultValue=...) at io/qsettings.cpp:3248
        d = 0x1da5220
        result = {d = {data = {c = 58 ':', uc = 58 ':', s = 58, sc = 58 ':', us = 58, i = 58, u = 58, l = 58, ul = 58, b = 58, d = 2.86558074587923e-322, f = 8.12753109e-44, real = 2.86558074587923e-322, ll = 58, ull = 58, o = 0x3a, ptr = 0x3a, shared = 0x3a}, type = 2, is_shared = 0, is_null = 0}}
        k = {static null = {<No data fields>}, d = 0x1da50e0}
#7  0x0000000000400cdb in main (argc=1, argv=0x7fffdaf01f78) at ../samples/qtbug41812/main.cpp:8
        __PRETTY_FUNCTION__ = "int main(int, char**)"
        settings = {<QObject> = {_vptr.QObject = 0x7fab8bd964d0 <vtable for QSettings+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7fab8bc98180 <qt_meta_stringdata_QObject>, data = 0x7fab8bc982a0 <qt_meta_data_QObject>, static_metacall = 0x7fab8bae6bfa <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x1da5220}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7fab8bca7700 <qt_meta_stringdata_Qt>, data = 0x7fab8bcb1a80 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7fab8bd93c80 <QObject::staticMetaObject>, stringdata = 0x7fab8bcbc8c0 <qt_meta_stringdata_QSettings>, data = 0x7fab8bcbc900 <qt_meta_data_QSettings>, static_metacall = 0x7fab8bb6e274 <QSettings::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}