Comment # 1 on bug 907795 from Martin Pluskal

Created attachment 615567 [details]
backtrace

Also yast2 bootloader segfault when closing after this issue:
(gdb) run bootloader qt
Starting program: /usr/lib/YaST2/bin/y2base bootloader qt
...
(gdb) set pagination off
(gdb) set log file bt-yast.log 
(gdb) set log on
Copying output to bt-yast.log.
(gdb) bt
#0  QMapNode<QWidget*, QList<QWidget*> >::copy (this=0x7fffe00cb790,
d=d@entry=0x31ab300) at /usr/include/qt5/QtCore/qbasicatomic.h:124
#1  0x00007fffeb6094c8 in detach_helper (this=0x7fffe003b598) at
/usr/include/qt5/QtCore/qmap.h:963
#2  detach (this=0x7fffe003b598) at /usr/include/qt5/QtCore/qmap.h:372
#3  remove (akey=<synthetic pointer>, this=0x7fffe003b598) at
/usr/include/qt5/QtCore/qmap.h:900
#4  QY2Styler::unregisterWidget (this=0x7fffe003b580,
widget=widget@entry=0x7fffe0051ea0) at
/usr/src/debug/libyui-qt-2.46.13/src/QY2Styler.cc:193
#5  0x00007fffeb61ebaa in YQDialog::~YQDialog (this=0x7fffe0051ea0,
__in_chrg=<optimized out>) at
/usr/src/debug/libyui-qt-2.46.13/src/YQDialog.cc:140
#6  0x00007fffeb61ec19 in YQDialog::~YQDialog (this=0x7fffe0051ea0,
__in_chrg=<optimized out>) at
/usr/src/debug/libyui-qt-2.46.13/src/YQDialog.cc:141
#7  0x00007ffff4225d5e in YDialog::deleteAllDialogs () at
/usr/src/debug/libyui-3.1.4/src/YDialog.cc:566
#8  0x00007ffff41fbac9 in YUI::~YUI (this=0x31ab1e0, __in_chrg=<optimized out>)
at /usr/src/debug/libyui-3.1.4/src/YUI.cc:99
#9  0x00007fffeb646679 in YQUI::~YQUI (this=0x31ab1e0, __in_chrg=<optimized
out>) at /usr/src/debug/libyui-qt-2.46.13/src/YQUI.cc:354
#10 0x00007ffff4483353 in YUIComponent::result (this=<optimized out>) at
YUIComponent.cc:251
#11 0x00007ffff744be29 in main (argc=<optimized out>, argv=<optimized out>) at
genericfrontend.cc:772
#12 0x00007ffff579fb45 in __libc_start_main (main=0x4006c0 <main@plt>, argc=3,
argv=0x7fffffffe4d8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7fffffffe4c8) at libc-start.c:289
#13 0x00000000004006f9 in _start () at ../sysdeps/x86_64/start.S:122

see attached file