QVariant bug on text fields with the ODBC driver for IBM iSeries application distributed by IBM with the iSeries Access for Linux.

  if(dbopen)
  {
    bool stato=false;
    qDebug()<<"Preparo la query...\n";
    QSqlQuery query(*db);
    query.prepare("SELECT DTDOC,NRDOC,RASCL FROM MONDINPERS/DOCACQ WHERE DTDOC=:i1");
    query.bindValue("i1",main_window->dateEdit->date().day()+main_window->dateEdit->date().month()*100+main_window->dateEdit->date().year()*10000);
    qDebug()<<"Eseguo la query...\n";
    query.exec();
    qDebug()<<"Query eseguita...\n";
    while(query.next())
    {
      qDebug()<<"Valore letto...";
      num_doc.append(query.value(1).toInt());
      qDebug()<<query.lastError();
      qDebug()<<"1...";
      main_window->listWidget_cli->addItem(QString("FD nr.")+QString::number(query.value(1).toInt())+QString(" di ")+(query.value(2).toString()));
      qDebug()<<"2...\n";
      stato=true;
    }
    if(stato)
      emit(message("Caricato dati da vecchia fatturazione."));
  }

(gdb) bt
#0 0x00007ffff5d0cba5 in raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007ffff5d106b0 in abort () at abort.c:92
#2 0x00007ffff5d05a71 in __assert_fail (
    assertion=0x7ffff5e22c40 "outbuf != ((void *)0) && *outbuf != ((void *)0)", file=<value optimized out>,
    line=75, function=0x7ffff5e1f7d9 "__gconv") at assert.c:81
#3 0x00007ffff5cf93a3 in __gconv (cd=0x922e80, inbuf=0x7fffffff9bc0,
    inbufend=0xb7ec62 "\362\360\361\360\361\362\363\361\361\360\360\361\367\360\371\302\344\306\306\326@\327\311\305\331\326", '@' <repeats 24 times>"\362, \360\361\360\361\362\363\361\361\360\360\361\367\361\360\326\342\301\303@\342\331\323", '@' <repeats 27 times>"\362, \360\361\360\361\362\363\361\361\360\360\361\367\361\361\302\305\331\343\311\325\326@\301\344\307\344\342\343\326@\242\201\242", '@' <repeats 16 times>"\362, \360\361\360\361\362\363\---Type <return> to continue, or q <return> to quit---
361\361\360\360\361\367\361\362\324\301\343\343\311\326\304\301@\327\311\305\331\311\325\326@P@\306\311\307\323\311@\342\327\301@@@@@@@"..., outbuf=0x7fffffff9bb0, outbufend=0x7ffff7fc9760 "`\227\374\367\377\177",
    irreversible=<value optimized out>) at gconv.c:75
#4 0x00007ffff5cf882c in iconv (cd=0x1210, inbuf=0x7fffffff9bc0, inbytesleft=0x7fffffff9bb8,
    outbuf=0x7fffffff9bb0, outbytesleft=0x7fffffff9ba8) at iconv.c:53
#5 0x00007fffe737631f in doIconv(void*, unsigned char const*, unsigned char*, unsigned long, unsigned long, unsigned long&, bool) () from /usr/lib/libcwbcore.so
#6 0x00007fffe7376456 in PiNlConverter::convertIconv(unsigned char const*, unsigned char*, unsigned long, unsigned long, PiNlConversionDetail&) const () from /usr/lib/libcwbcore.so
#7 0x00007fffe73796a8 in PiNlConverter::convert(unsigned char const*, unsigned char*, unsigned long, unsigned lon---Type <return> to continue, or q <return> to quit---
g, PiNlConversionDetail&) const () from /usr/lib/libcwbcore.so
#8 0x00007fffe75c6f5f in STATEMENT_INFO::convertToClientCodePage(char const*, char*, unsigned int, unsigned int, COLUMN_INFO&, COLUMN_INFO const&, unsigned int*, PiNlConverter::PADTYPE, int) ()
   from /opt/ibm/iSeriesAccess/lib64/libcwbodbc.so
#9 0x00007fffe75c771b in odbcConv_SQL400_CHAR_to_C_WCHAR(STATEMENT_INFO&, char const*, char*, unsigned int, unsigned int, COLUMN_INFO&, COLUMN_INFO const&, unsigned int*) () from /opt/ibm/iSeriesAccess/lib64/libcwbodbc.so
#10 0x00007fffe75c2587 in odbcConvSQLtoC(STATEMENT_INFO&, int, int, char const*, char*, unsigned int, unsigned int, COLUMN_INFO&, COLUMN_INFO&, unsigned int*) () from /opt/ibm/iSeriesAccess/lib64/libcwbodbc.so
#11 0x00007fffe75b17b9 in STATEMENT_INFO::odbcGetData(unsigned int, short, char*, int, int*) ()
   from /opt/ibm/iSeriesAccess/lib64/libcwbodbc.so
---Type <return> to continue, or q <return> to quit---
#12 0x00007fffe75b478d in SQLGetData () from /opt/ibm/iSeriesAccess/lib64/libcwbodbc.so
#13 0x00007fffe839d7e1 in SQLGetData () from /usr/lib/libodbc.so.1
#14 0x00007fffe85f2114 in qGetStringData (hStmt=0xb0df00, column=<value optimized out>, colSize=36,
    unicode=<value optimized out>) at ../../../sql/drivers/odbc/qsql_odbc.cpp:379
#15 0x00007fffe85fc986 in QODBCResult::data (this=0x931d80, field=2)
    at ../../../sql/drivers/odbc/qsql_odbc.cpp:1212
#16 0x00007ffff7babc4d in QSqlQuery::value (this=0x7fffffffb9e0, index=2) at kernel/qsqlquery.cpp:399
#17 0x000000000041b294 in fatture::leggiFatture (this=0x96ec70) at fattura.cpp:657
#18 0x00000000004363e9 in fatture::qt_metacall (this=0x96ec70, _c=QMetaObject::InvokeMetaMethod, _id=12,
    _a=0x7fffffffbbd0) at moc_fattura.cpp:113
---Type <return> to continue, or q <return> to quit---
#19 0x00007ffff6b98b27 in QMetaObject::activate (sender=0x7f90b0, m=<value optimized out>,
    local_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3280
#20 0x00007ffff7468d45 in QDateTimeEdit::dateChanged (this=0x1210, _t1=<value optimized out>)
    at .moc/release-shared/moc_qdatetimeedit.cpp:254
#21 0x00007ffff746f0e1 in QDateTimeEditPrivate::emitSignals (this=0x7fffffffbc00, ep=<value optimized out>,
    old=<value optimized out>) at widgets/qdatetimeedit.cpp:2120
#22 0x00007ffff744929e in QAbstractSpinBoxPrivate::setValue (this=0x765640, val=<value optimized out>,
    ep=EmitIfChanged, doUpdate=<value optimized out>) at widgets/qabstractspinbox.cpp:1719
#23 0x00007ffff744c865 in QAbstractSpinBoxPrivate::_q_editorTextChanged (this=0x765640, t=...)
    at widgets/qabstractspinbox.cpp:1487
---Type <return> to continue, or q <return> to quit---
#24 0x00007ffff744c9ae in QAbstractSpinBox::qt_metacall (this=0x7f90b0, _c=QMetaObject::InvokeMetaMethod,
    _id=<value optimized out>, _a=0x7fffffffbf80) at .moc/release-shared/moc_qabstractspinbox.cpp:120
#25 0x00007ffff7470495 in QDateTimeEdit::qt_metacall (this=0x1210, _c=4624, _id=6, _a=0xffffffffffffffff)
    at .moc/release-shared/moc_qdatetimeedit.cpp:154
#26 0x00007ffff7470945 in QDateEdit::qt_metacall (this=0x1210, _c=4624, _id=6, _a=0xffffffffffffffff)
    at .moc/release-shared/moc_qdatetimeedit.cpp:389
#27 0x00007ffff6b98b27 in QMetaObject::activate (sender=0x8b2300, m=<value optimized out>,
    local_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3280
#28 0x00007ffff749ae72 in QLineEdit::textChanged (this=0x1210, _t1=<value optimized out>)
    at .moc/release-shared/moc_qlineedit.cpp:242
---Type <return> to continue, or q <return> to quit---
#29 0x00007ffff749e36c in QLineEdit::qt_metacall (this=0x8b2300, _c=QMetaObject::InvokeMetaMethod,
    _id=<value optimized out>, _a=0x7fffffffc130) at .moc/release-shared/moc_qlineedit.cpp:158
#30 0x00007ffff6b98b27 in QMetaObject::activate (sender=0x8f1710, m=<value optimized out>,
    local_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3280
#31 0x00007ffff774c295 in QLineControl::textChanged (this=0x1210, _t1=<value optimized out>)
    at .moc/release-shared/moc_qlinecontrol_p.cpp:131
#32 0x00007ffff74a4be6 in QLineControl::finishChange (this=0x8f1710, validateFromState=26,
    update=<value optimized out>, edited=true) at widgets/qlinecontrol.cpp:605
#33 0x00007ffff74a65ff in QLineControl::processKeyEvent (this=0x8f1710, event=0x7fffffffcef0)
    at widgets/qlinecontrol.cpp:1787
---Type <return> to continue, or q <return> to quit---
#34 0x00007ffff749b021 in QLineEdit::keyPressEvent (this=<value optimized out>, event=0x1210)
    at widgets/qlineedit.cpp:1665
#35 0x00007ffff70c1cfa in QWidget::event (this=0x8b2300, event=0x7fffffffcef0) at kernel/qwidget.cpp:8222
#36 0x00007ffff749c223 in QLineEdit::event (this=0x8b2300, e=0x7fffffffcef0) at widgets/qlineedit.cpp:1482
#37 0x00007ffff744bd13 in QAbstractSpinBox::keyPressEvent (this=0x7f90b0, event=0x7fffffffcef0)
    at widgets/qabstractspinbox.cpp:1064
#38 0x00007ffff746f7be in QDateTimeEdit::keyPressEvent (this=0x7f90b0, event=0x7fffffffcef0)
    at widgets/qdatetimeedit.cpp:1177
#39 0x00007ffff70c1cfa in QWidget::event (this=0x7f90b0, event=0x7fffffffcef0) at kernel/qwidget.cpp:8222
#40 0x00007ffff746e29d in QDateTimeEdit::event (this=0x7f90b0, event=0x7fffffffcef0)
---Type <return> to continue, or q <return> to quit---
    at widgets/qdatetimeedit.cpp:1039
#41 0x00007ffff706bfdc in QApplicationPrivate::notify_helper (this=0x644480, receiver=0x7f90b0, e=0x7fffffffcef0)
    at kernel/qapplication.cpp:4396
#42 0x00007ffff7073346 in QApplication::notify (this=<value optimized out>, receiver=0x7f90b0, e=0x7fffffffcef0)
    at kernel/qapplication.cpp:3857
#43 0x00007ffff6b80cdc in QCoreApplication::notifyInternal (this=0x7fffffffe060, receiver=0x7f90b0,
    event=0x7fffffffcef0) at kernel/qcoreapplication.cpp:732
#44 0x00007ffff71194ba in QKeyMapper::sendKeyEvent (keyWidget=0x7f90b0, grab=<value optimized out>,
    type=QEvent::KeyPress, code=49, modifiers=<value optimized out>, text=..., autorepeat=false, count=1,
    nativeScanCode=87, nativeVirtualKey=65457, nativeModifiers=16) at kernel/qkeymapper_x11.cpp:1867
---Type <return> to continue, or q <return> to quit---
#45 0x00007ffff711bac0 in QKeyMapperPrivate::translateKeyEvent (this=0x69cf50, keyWidget=0x7f90b0,
    event=<value optimized out>, grab=16) at kernel/qkeymapper_x11.cpp:1837
#46 0x00007ffff70f2cb4 in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fffffffdac0)
    at kernel/qapplication_x11.cpp:3429
#47 0x00007ffff711f0e2 in x11EventSourceDispatch (s=0x649630, callback=<value optimized out>,
    user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#48 0x00007ffff536e342 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#49 0x00007ffff53722a8 in ?? () from /lib/libglib-2.0.so.0
#50 0x00007ffff537245c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#51 0x00007ffff6bad193 in QEventDispatcherGlib::processEvents (this=0x645990, flags=<value optimized out>)
---Type <return> to continue, or q <return> to quit---
    at kernel/qeventdispatcher_glib.cpp:415
#52 0x00007ffff711ea4e in QGuiEventDispatcherGlib::processEvents (this=0x1210, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:204
#53 0x00007ffff6b7fa02 in QEventLoop::processEvents (this=<value optimized out>, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece or DW_OP_bit_piece.
)
    at kernel/qeventloop.cpp:149
#54 0x00007ffff6b7fdec in QEventLoop::exec (this=0x7fffffffddf0, flags=DWARF-2 expression error: DW_OP_reg operations must be used either alone or in conjuction with DW_OP_piece or DW_OP_bit_piece.
) at kernel/qeventloop.cpp:201
#55 0x00007ffff6b83ebb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#56 0x000000000042835f in main (argc=1, argv=0x7fffffffe1f8) at main.cpp:43
(gdb)