Thread 2 (Thread 0x7f53cd632700 (LWP 16847)):
#0  0x00007f53d0ab78e3 in select () at ../sysdeps/unix/syscall-template.S:81
No locals.
#1  0x00007f53d1644403 in qt_safe_select (nfds=7, fdread=0x7f53c8000a78, fdwrite=0x7f53c8000d08, fdexcept=0x7f53c8000f98, orig_timeout=0x0) at kernel/qcore_unix.cpp:75
        ret = -849143056
        start = {tv_sec = 139997904837376, tv_nsec = 139997971541431}
        timeout = {tv_sec = 0, tv_nsec = 139997904837424}
        ret = 32595
#2  0x00007f53d1645b66 in QEventDispatcherUNIX::select (this=0x7f53c80008c0, nfds=7, readfds=0x7f53c8000a78, writefds=0x7f53c8000d08, exceptfds=0x7f53c8000f98, timeout=0x0) at kernel/qeventdispatcher_unix.cpp:320
No locals.
#3  0x00007f53d1645310 in QEventDispatcherUNIXPrivate::doSelect (this=0x7f53c80008e0, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:196
        highest = 6
        wakeUpFd = 6
        q = 0x7f53c80008c0
        nsel = -785144221
        __PRETTY_FUNCTION__ = "int QEventDispatcherUNIXPrivate::doSelect(QEventLoop::ProcessEventsFlags, timespec*)"
        nevents = 32595
#4  0x00007f53d1646d8f in QEventDispatcherUNIX::processEvents (this=0x7f53c80008c0, flags=...) at kernel/qeventdispatcher_unix.cpp:607
        tm = 0x0
        wait_tm = {tv_sec = 0, tv_nsec = 0}
        d = 0x7f53c80008e0
        nevents = 0
        canWait = true
#5  0x00007f53d15ce69c in QEventLoop::processEvents (this=0x7f53cd631e10, flags=...) at kernel/qeventloop.cpp:128
        d = 0x7f53c80012d0
#6  0x00007f53d15ce95d in QEventLoop::exec (this=0x7f53cd631e10, flags=...) at kernel/qeventloop.cpp:204
        locker = {val = 10557952}
        __PRETTY_FUNCTION__ = "int QEventLoop::exec(QEventLoop::ProcessEventsFlags)"
        ref = {d = 0x7f53c80012d0, locker = @0x7f53cd631d80, exceptionCaught = true}
        app = 0x7fffbd157950
        d = 0x7f53c80012d0
#7  0x00007f53d1353f76 in QThread::exec (this=0xa10030) at thread/qthread.cpp:503
        d = 0xa11990
        locker = {val = 10557952}
        eventLoop = {<QObject> = {_vptr.QObject = 0x7f53d18c73b0 <vtable for QEventLoop+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17c8800 <qt_meta_stringdata_QObject>, data = 0x7f53d17c8920 <qt_meta_data_QObject>, static_metacall = 0x7f53d16175aa <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0x7f53c80012d0}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17d7d80 <qt_meta_stringdata_Qt>, data = 0x7f53d17e2100 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f53d18c3c80 <QObject::staticMetaObject>, stringdata = 0x7f53d17eece0 <qt_meta_stringdata_QEventLoop>, data = 0x7f53d17eed40 <qt_meta_data_QEventLoop>, static_metacall = 0x7f53d16a1158 <QEventLoop::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        returnCode = 0
#8  0x00007f53d1c76f45 in QQmlThreadPrivate::run (this=0xa10030) at qml/ftw/qqmlthread.cpp:141
No locals.
#9  0x00007f53d135b267 in QThreadPrivate::start (arg=0xa10030) at thread/qthread_unix.cpp:337
        __clframe = {__cancel_routine = 0x7f53d135b2ee <QThreadPrivate::finish(void*)>, __cancel_arg = 0xa10030, __do_it = 1, __cancel_type = 32595}
        thr = 0xa10030
        data = 0xa0ff20
        objectName = {static null = {<No data fields>}, d = 0x7f53d1da9020 <QQmlThreadPrivate::QQmlThreadPrivate(QQmlThread*)::{lambda()#1}::operator()() const::qstring_literal>}
#10 0x00007f53d07af182 in start_thread (arg=0x7f53cd632700) at pthread_create.c:312
        __res = <optimized out>
        pd = 0x7f53cd632700
        now = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139997904840448, -5476683796115000490, 1, 0, 139997904841152, 139997904840448, 5573613405072094038, 5573567305968218966}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}
        not_first_call = <optimized out>
        pagesize_m1 = <optimized out>
        sp = <optimized out>
        freesize = <optimized out>
        __PRETTY_FUNCTION__ = "start_thread"
#11 0x00007f53d0abffbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.

Thread 1 (Thread 0x7f53d1f89780 (LWP 16829)):
#0  0x00007f53d19ac481 in QV4::Value::isObject (this=0x7f53cc632000) at /depot/fkleint/qt-5s/qtbase/include/QtQml/5.4.0/QtQml/private/../../../../../../qtdeclarative/src/qml/jsruntime/qv4value_inl_p.h:65
No locals.
#1  0x00007f53d1b59490 in QV4::Value::as<QV4::VariantObject> (this=0x7f53cc632000) at /depot/fkleint/qt-5s/qtbase/include/QtQml/5.4.0/QtQml/private/../../../../../../qtdeclarative/src/qml/jsruntime/qv4value_inl_p.h:276
        m = 0x7fffbd1576f0
#2  0x00007f53d1c782f2 in QV8Engine::toVariant (this=0xa11ef0, value=..., typeHint=-1, createJSValueForObjects=true, visitedObjects=0x0) at qml/v8/qv8engine.cpp:167
        v = 0x7fffbd1578ef
        scope = {engine = 0xa12690, mark = 0x7f53cc632008, size = 0}
        o = {ptr = 0x7fffbd1577e0}
#3  0x00007f53d1bd4bee in QQmlExpressionPrivate::value (this=0xb0a580, isUndefined=0x7fffbd1578ef) at qml/qqmlexpression.cpp:278
        scope = {engine = 0xa12690, mark = 0x7f53cc632000, size = 1}
        result = {ptr = 0x7f53cc632000}
        q = 0x7fffbd157960
        __PRETTY_FUNCTION__ = "QVariant QQmlExpressionPrivate::value(bool*)"
        ep = 0xa116d0
        rv = {d = {data = {c = 0 '\000', uc = 0 '\000', s = 0, sc = 0 '\000', us = 0, i = 0, u = 0, l = 0, ul = 0, b = false, d = 0, f = 0, real = 0, ll = 0, ull = 0, o = 0x0, ptr = 0x0, shared = 0x0}, type = 0, is_shared = 0, is_null = 1}}
#4  0x00007f53d1bd4c85 in QQmlExpression::evaluate (this=0x7fffbd157960, valueIsUndefined=0x7fffbd1578ef) at qml/qqmlexpression.cpp:298
        d = 0xb0a580
#5  0x0000000000401450 in main (nargs=1, args=0x7fffbd157ab8) at ../qtbug41860/main.cpp:18
        __PRETTY_FUNCTION__ = "int main(int, char**)"
        scope = 0xaffa60
        app = {<QObject> = {_vptr.QObject = 0x7f53d18c7490 <vtable for QCoreApplication+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17c8800 <qt_meta_stringdata_QObject>, data = 0x7f53d17c8920 <qt_meta_data_QObject>, static_metacall = 0x7f53d16175aa <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xa0e120}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17d7d80 <qt_meta_stringdata_Qt>, data = 0x7f53d17e2100 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f53d18c3c80 <QObject::staticMetaObject>, stringdata = 0x7f53d17eee60 <qt_meta_stringdata_QCoreApplication>, data = 0x7f53d17ef080 <qt_meta_data_QCoreApplication>, static_metacall = 0x7f53d16a12b0 <QCoreApplication::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, static self = 0x7fffbd157950}
        argL = {<QList<QString>> = {<QListSpecialMethods<QString>> = {<No data fields>}, {p = {static shared_null = {ref = {atomic = {_q_value = -1}}, alloc = 0, begin = 0, end = 0, array = {0x0}}, d = 0xa0ff00}, d = 0xa0ff00}}, <No data fields>}
        exprS = {static null = {<No data fields>}, d = 0xa0ffa0}
        engine = {<QJSEngine> = {<QObject> = {_vptr.QObject = 0x7f53d1ee36f0 <vtable for QQmlEngine+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17c8800 <qt_meta_stringdata_QObject>, data = 0x7f53d17c8920 <qt_meta_data_QObject>, static_metacall = 0x7f53d16175aa <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xa116d0}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17d7d80 <qt_meta_stringdata_Qt>, data = 0x7f53d17e2100 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f53d18c3c80 <QObject::staticMetaObject>, stringdata = 0x7f53d1d0b4e0 <qt_meta_stringdata_QJSEngine>, data = 0x7f53d1d0b520 <qt_meta_data_QJSEngine>, static_metacall = 0x7f53d1a7bfb6 <QJSEngine::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d = 0xa11ef0}, static staticMetaObject = {d = {superdata = 0x7f53d1edc360 <QJSEngine::staticMetaObject>, stringdata = 0x7f53d1dba880 <qt_meta_stringdata_QQmlEngine>, data = 0x7f53d1dba960 <qt_meta_data_QQmlEngine>, static_metacall = 0x7f53d1cedcd4 <QQmlEngine::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        context = 0xb0aad0
        expression = {<QObject> = {_vptr.QObject = 0x7f53d1edf0d0 <vtable for QQmlExpression+16>, static staticMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17c8800 <qt_meta_stringdata_QObject>, data = 0x7f53d17c8920 <qt_meta_data_QObject>, static_metacall = 0x7f53d16175aa <QObject::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}, d_ptr = {d = 0xb0a580}, static staticQtMetaObject = {d = {superdata = 0x0, stringdata = 0x7f53d17d7d80 <qt_meta_stringdata_Qt>, data = 0x7f53d17e2100 <qt_meta_data_Qt>, static_metacall = 0x0, relatedMetaObjects = 0x0, extradata = 0x0}}}, static staticMetaObject = {d = {superdata = 0x7f53d18c3c80 <QObject::staticMetaObject>, stringdata = 0x7f53d1d593e0 <qt_meta_stringdata_QQmlExpression>, data = 0x7f53d1d59460 <qt_meta_data_QQmlExpression>, static_metacall = 0x7f53d1bd4ff0 <QQmlExpression::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)>, relatedMetaObjects = 0x0, extradata = 0x0}}}
        valueIsUndefined = true
        v = {d = {data = {c = -88 '\250', uc = 168 '\250', s = 20904, sc = -88 '\250', us = 20904, i = -794996312, u = 3499970984, l = 139997958984104, ul = 139997958984104, b = 168, d = 6.9168182021937687e-310, f = -2.11149947e+10, real = 6.9168182021937687e-310, ll = 139997958984104, ull = 139997958984104, o = 0x7f53d09d51a8, ptr = 0x7f53d09d51a8, shared = 0x7f53d09d51a8}, type = 302963168, is_shared = 1, is_null = 1}}