Bug 359586

Summary:	Effects dialog crashes when clicking the 'movie icon'
Product:	[Plasma] kwin	Reporter:	Thomas Mitterfellner <thomas>
Component:	effects-various	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal
Priority:	NOR
Version First Reported In:	5.5.4
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Backtrace

Description Thomas Mitterfellner 2016-02-19 21:25:04 UTC

Running kcmshell5 kwineffects and clicking on one of the movie icons leads to a segfault.
Unfortunately, I don't even know what that icon should do, supposedly a preview?

Reproducible: Always

Comment 1 Thomas Lübking 2016-02-19 21:58:40 UTC

Can you provide a backtrace ("developer information" from the crash dialog)?

Comment 2 Thomas Mitterfellner 2016-02-21 11:08:04 UTC

That's the strange thing: I don't get this dialog offering me to make a backtrace. I have the debuginfo/symbols of kwin installed and I tried to run it from gdb, but the traceback I got (~50 levels; the longest traceback I had seen so far) does not look very useful to me. Could you give me instructions on how to get a useful backtrace (or was the gdb method OK?)?

Comment 3 Thomas Lübking 2016-02-21 11:32:42 UTC

gdb should be fine, maybe it's required to have it for all threads ("thread apply all bt") - just attach it: we'll then figure whether we require more info.

Comment 4 Thomas Mitterfellner 2016-02-21 12:20:56 UTC

Created attachment 97332 [details]
Backtrace

Comment 5 Thomas Lübking 2016-02-21 12:39:16 UTC

gstreamer -> libsoup -> libproxy, dlopens kdelibs (KDE4) => Qt4/Qt5 symbols in one process: boom.

See bug #346209 on more details - no idea where "modules/config_kde4.so" comes from (isn't installed here, maybe downstream thing of parallel KDE4/KDE5 installation)

*** This bug has been marked as a duplicate of bug 323407 ***

Comment 6 Martin Flöser 2016-02-23 08:11:16 UTC

@Thomas Mitterfellner: which distribution are you using?

Comment 7 Thomas Mitterfellner 2016-02-23 08:55:17 UTC

I'm using openSUSE Leap 42.1 but I did a distribution upgrade from 13.2, so maybe that's the reason for the mixed symbols. Unfortunately, I don't know what I have to uninstall and whether it would actually be possible because of some applications depending on kde4 libs still.

Comment 8 Thomas Lübking 2016-02-23 09:30:17 UTC

rpm -qf /usr/lib/libproxy/0.4.11/modules/config_kde4.so

should be "libproxy1-config-kde4"

Upstream bug report is https://code.google.com/archive/p/libproxy/issues/197 and they're wrong about KDE symbol versioning - the problem is in the Qt libs.