[Bug 303534] New: System settings app crashes when I attempt to change the screen saver

[Alex LaHurreau]

https://bugs.kde.org/show_bug.cgi?id=303534

            Bug ID: 303534
          Severity: crash
           Version: 1.0
          Priority: NOR
          Assignee: unassigned-bugs at kde.org
           Summary: System settings app crashes when I attempt to change
                    the screen saver
    Classification: Unclassified
                OS: Linux
          Reporter: alexdw at mgzi.net
          Hardware: Debian unstable
            Status: UNCONFIRMED
         Component: general
           Product: systemsettings

Application: systemsettings (1.0)
KDE Platform Version: 4.8.4 (4.8.4)
Qt Version: 4.8.2
Operating System: Linux 3.2.0-3-amd64 x86_64
Distribution: Debian GNU/Linux unstable (sid)

-- Information about the crash:
- What I was doing when the application crashed:
I opened the System Settings app, and then clicked on Display and Monitor.
Then, I clicked on Screen Saver. The application crashed.

- Custom settings of the application:
The current screen saver is the Apple2 screen saver from the xscreensaver
collection.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  0x00007fdb4d4d5180 in xcb_glx_query_server_string_string_length () from
/usr/lib/x86_64-linux-gnu/libxcb-glx.so.0
#7  0x00007fdb4e04f2b4 in ?? () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#8  0x00007fdb4e030bca in ?? () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#9  0x00007fdb4e02d349 in ?? () from /usr/lib/x86_64-linux-gnu/libGL.so.1
#10 0x00007fdb4e02daeb in glXChooseVisual () from
/usr/lib/x86_64-linux-gnu/libGL.so.1
#11 0x00007fdb4e4b23af in ?? () from /usr/lib/kde4/kcm_screensaver.so
#12 0x00007fdb4e4ac49e in ?? () from /usr/lib/kde4/kcm_screensaver.so
#13 0x00007fdb4e4ae053 in ?? () from /usr/lib/kde4/kcm_screensaver.so
#14 0x00007fdb637fa5cf in QMetaObject::activate (sender=0x2c85e30, m=<optimized
out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#15 0x00007fdb637f98dc in QObject::event (this=0x2c85e30, e=<optimized out>) at
kernel/qobject.cpp:1157
#16 0x00007fdb6447270c in QApplicationPrivate::notify_helper
(this=this at entry=0x257f610, receiver=receiver at entry=0x2c85e30,
e=e at entry=0x7ffff6a0a9d0) at kernel/qapplication.cpp:4556
#17 0x00007fdb64476b8a in QApplication::notify (this=0x7ffff6a0ad60,
receiver=0x2c85e30, e=0x7ffff6a0a9d0) at kernel/qapplication.cpp:4417
#18 0x00007fdb651a58a6 in KApplication::notify (this=0x7ffff6a0ad60,
receiver=0x2c85e30, event=0x7ffff6a0a9d0) at
../../kdeui/kernel/kapplication.cpp:311
#19 0x00007fdb637e4bde in QCoreApplication::notifyInternal
(this=0x7ffff6a0ad60, receiver=0x2c85e30, event=0x7ffff6a0a9d0) at
kernel/qcoreapplication.cpp:915
#20 0x00007fdb63815ac2 in sendEvent (event=0x7ffff6a0a9d0, receiver=<optimized
out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#21 QTimerInfoList::activateTimers (this=0x2580b20) at
kernel/qeventdispatcher_unix.cpp:611
#22 0x00007fdb63812c84 in timerSourceDispatch (source=<optimized out>) at
kernel/qeventdispatcher_glib.cpp:186
#23 timerSourceDispatch (source=source at entry=0x2580ac0) at
kernel/qeventdispatcher_glib.cpp:180
#24 0x00007fdb60993205 in g_main_dispatch (context=0x2580a00) at
/tmp/buildd/glib2.0-2.32.3/./glib/gmain.c:2539
#25 g_main_context_dispatch (context=context at entry=0x2580a00) at
/tmp/buildd/glib2.0-2.32.3/./glib/gmain.c:3075
#26 0x00007fdb60993538 in g_main_context_iterate
(context=context at entry=0x2580a00, block=block at entry=1,
dispatch=dispatch at entry=1, self=<error reading variable: Unhandled dwarf
expression opcode 0xfa>) at /tmp/buildd/glib2.0-2.32.3/./glib/gmain.c:3146
#27 0x00007fdb609935f4 in g_main_context_iteration (context=0x2580a00,
may_block=1) at /tmp/buildd/glib2.0-2.32.3/./glib/gmain.c:3207
#28 0x00007fdb638132e6 in QEventDispatcherGlib::processEvents (this=0x254d4b0,
flags=...) at kernel/qeventdispatcher_glib.cpp:424
#29 0x00007fdb6451396e in QGuiEventDispatcherGlib::processEvents
(this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007fdb637e392f in QEventLoop::processEvents
(this=this at entry=0x7ffff6a0ac40, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007fdb637e3bb8 in QEventLoop::exec (this=0x7ffff6a0ac40, flags=...) at
kernel/qeventloop.cpp:204
#32 0x00007fdb637e8d78 in QCoreApplication::exec () at
kernel/qcoreapplication.cpp:1187
#33 0x000000000040b1ee in ?? ()
#34 0x00007fdb62ff8ead in __libc_start_main (main=<optimized out>,
argc=<optimized out>, ubp_av=<optimized out>, init=<optimized out>,
fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff6a0ae98) at
libc-start.c:228
#35 0x000000000040b245 in _start ()

Reported using DrKonqi

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