Bug 375081

Summary:	Plasmashell crashes with plasmawayland session on startup
Product:	[Plasma] plasmashell	Reporter:	perrantrevan
Component:	generic-wayland	Assignee:	Plasma Bugs List <plasma-bugs>
Status:	RESOLVED UPSTREAM
Severity:	crash	CC:	arojas, bhush94, demm, notmart, pieter.david
Priority:	NOR
Version:	5.8.95
Target Milestone:	1.0
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description perrantrevan 2017-01-15 09:57:58 UTC

Using [kde-unstable] packages for Arch Linux. Even with new user and so fresh config files and caches, plasmashell crashes on startup but only for the plasmawayland session. 

sudo journalctl -i | grep libwayland shows loads of segfaults for plasmashell, krunner, and kwin-wayland e.g.

plasmashell[1126]: segfault at 0 ip 00007f5ae8de7289 sp 00007ffc6fab7010 error 4 in libwayland-client.so.0.3.0

Comment 1 Antonio Rojas 2017-01-15 11:16:36 UTC

Just to add some context: the [kde-unstable] repo contains also Qt 5.8 RC. There are reports from other users that can reproduce the issue with Qt 5.8RC + Plasma 5.8.5, so the problem seems to be with Qt 5.8.

Will try to provide a useful backtrace with debug symbols.

Comment 2 Marco Martin 2017-01-17 10:21:13 UTC

needs backtrace to be useful

Comment 3 Pieter David 2017-01-19 20:25:25 UTC

I am seeing something very similar (black screen with mouse pointer, sometimes some of my autostart programs (e.g. owncloud sync) start, if I close those, right-click or press the krunner keyboard shortcut krunner crashes and ~1min later plasmashell as well), so I think it's the same problem.

I recompiled qt5-base, qt5-wayland (5.8 RC) and plasma-workspace (5.8.95) with debug symbols.

For krunner I got this stacktrace from journalctl (demangled with c++filt):

Stack trace of thread 1254:
#0  0x00007f61295a304f raise (libc.so.6)
#1  0x00007f612d8ba7d6 KCrash::defaultCrashHandler(int) (libKF5Crash.so.5)
#2  0x00007f61295a30b0 __restore_rt (libc.so.6)
#3  0x00007f6127f26289 wl_proxy_marshal (libwayland-client.so.0)
#4  0x00007f6119e3d259 QtWayland::wl_surface::destroy() (libQt5WaylandClient.so.5)
#5  0x00007f6119e23bfb QtWaylandClient::QWaylandWindow::reset()
#6  0x00007f6119e26ff8 QtWaylandClient::QWaylandWindow::setVisible(bool)
#7  0x00007f612a4756cc QWindow::setVisible(bool) (libQt5Gui.so.5)
#8  0x0000000000406baa main (krunner)
#9  0x00007f6129590291 __libc_start_main (libc.so.6)
#10 0x0000000000406cda _start (krunner)

for plasmashell only this:

Stack trace of thread 1256:
#0  0x00007f15fa16004f n/a (n/a)

(libwayland-client is provided by the wayland 1.12.0-1 package)

Comment 4 Bhushan Shah 2017-01-25 17:25:14 UTC

https://codereview.qt-project.org/#/c/181146/