Bug 364829

Summary:	ctrl-tabbing (application switcher) caused kwin crash
Product:	[Plasma] kwin	Reporter:	Alan Aversa <aversa>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED UNMAINTAINED
Severity:	crash	Keywords:	drkonqi
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Slackware
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Alan Aversa 2016-06-27 20:18:38 UTC

Application: kwin (4.11.22)
KDE Platform Version: 4.14.21
Qt Version: 4.8.7
Operating System: Linux 4.4.14 x86_64
Distribution (Platform): Slackware Packages

-- Information about the crash:
- What I was doing when the application crashed:
I was ctrl-tabbing between applications.

- Unusual behavior I noticed:
none

- Custom settings of the application:
not that I know of

I just restarted my machine with a newer KDE install, after having previously force-quitted KDE (quit it uncleanly).

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff6277437c0 (LWP 2153))]

Thread 2 (Thread 0x7ff608368700 (LWP 5074)):
#0  0x00007ff62169736f in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007ff62670e5aa in  () at /usr/lib64/qt/lib/libQtScript.so.4
#2  0x00007ff62670e5d9 in  () at /usr/lib64/qt/lib/libQtScript.so.4
#3  0x00007ff621691684 in start_thread () at /lib64/libpthread.so.0
#4  0x00007ff61f76cefd in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7ff6277437c0 (LWP 2153)):
[KCrash Handler]
#6  0x00007ff627287e27 in  () at /usr/lib64/libkdeinit4_kwin.so
#7  0x00007ff62728840d in  () at /usr/lib64/libkdeinit4_kwin.so
#8  0x00007ff6272885fd in  () at /usr/lib64/libkdeinit4_kwin.so
#9  0x00007ff627277792 in  () at /usr/lib64/libkdeinit4_kwin.so
#10 0x00007ff627294dda in  () at /usr/lib64/libkdeinit4_kwin.so
#11 0x00007ff627296d4b in  () at /usr/lib64/libkdeinit4_kwin.so
#12 0x00007ff6272978d8 in  () at /usr/lib64/libkdeinit4_kwin.so
#13 0x00007ff62728ba80 in  () at /usr/lib64/libkdeinit4_kwin.so
#14 0x00007ff620bf7cb2 in  () at /usr/lib64/qt/lib/libQtGui.so.4
#15 0x00007ff620c088f2 in QApplication::x11ProcessEvent(_XEvent*) () at /usr/lib64/qt/lib/libQtGui.so.4
#16 0x00007ff620c3124f in  () at /usr/lib64/qt/lib/libQtGui.so.4
#17 0x00007ff621a365d1 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/qt/lib/libQtCore.so.4
#18 0x00007ff621a368e5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib64/qt/lib/libQtCore.so.4
#19 0x00007ff621a3bec9 in QCoreApplication::exec() () at /usr/lib64/qt/lib/libQtCore.so.4
#20 0x00007ff62728c826 in kdemain () at /usr/lib64/libkdeinit4_kwin.so
#21 0x00007ff61f6867d0 in __libc_start_main () at /lib64/libc.so.6
#22 0x0000000000400a09 in _start ()

Reported using DrKonqi

Comment 1 Thomas Lübking 2016-06-27 21:36:53 UTC

KDE 4 is no longer maintained, but also the backtrace is missing any debug symbols.
Could somehow be related to
> previously force-quitted KDE
but if it's a reproducible bug and you want to know about the cause, ensure to install debug packages for kwin to provide a full backtrace (it won't be fixed anymore, but maybe there's a workaround)