Bug 459442

Summary:	Neon testing: can't log into wayland from SDDM. xdg-desktop-portal issue?
Product:	[Plasma] xdg-desktop-portal-kde	Reporter:	Russ Hay <RussellH>
Component:	general	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	aleixpol, jgrulich, nate
Priority:	NOR
Version First Reported In:	git-stable-Plasma/5.26
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Russ Hay 2022-09-20 13:26:09 UTC

SUMMARY
***
after updates - on Neon testing, cannot log into a wayland session. screen flickers slightly then returns to SDDM. X11 session is fine.
***


STEPS TO REPRODUCE
1. log into SDDM
2. 
3. 

OBSERVED RESULT
login does not work, and returns to SDDM without reporting an error.

EXPECTED RESULT
login should open a plasma wayland session.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma:  5.25.90
(available in About System)
KDE Plasma Version: 5.25.90
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6

ADDITIONAL INFORMATION

Looking through the log seems to be a xdg-desktop-portal issue. 
Sep 20 12:38:13 russ-surfacepro klauncher[1432]: qt.qpa.wayland: Creating a fake screen in order for Qt not to crash 
Sep 20 12:38:13 russ-surfacepro klauncher[1432]: The Wayland connection broke. Did the Wayland compositor die? 
Sep 20 12:38:13 russ-surfacepro xdg-desktop-por[1453]: cannot open display: :1 
Sep 20 12:38:13 russ-surfacepro xdg-desktop-portal-gtk[1453]: Unable to init server: Could not connect: Connection refused 
Sep 20 12:38:13 russ-surfacepro systemd[1373]: xdg-desktop-portal-gtk.service: Main process exited, code=exited, status=1/FAILURE 
Sep 20 12:38:13 russ-surfacepro systemd[1373]: xdg-desktop-portal-gtk.service: Failed with result 'exit-code'. 
Sep 20 12:38:13 russ-surfacepro systemd[1373]: Failed to start Portal service (GTK+/GNOME implementation).
 
I'll see if I can generate some debug info at-all

Comment 1 Aleix Pol 2022-09-20 13:54:30 UTC

No, it sure isn't an xdg-desktop-portal crash.

Can you check coredumpctl and see if kwin_wayland is crashing? if so please give us the backtrace.

Comment 2 Russ Hay 2022-09-20 14:50:35 UTC

Thanks for checking this - so coredumpctl seems to show the same; 
Tue 2022-09-20 09:37:31 BST    1483   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 09:39:40 BST    2007   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 10:32:20 BST    1405   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 10:45:29 BST    1388   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 11:51:33 BST    2462  1000  1000   6 present   /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 11:52:00 BST    2487   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:01:59 BST    2029  1000  1000   6 present   /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:02:46 BST    2210   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:08:50 BST    3090   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:17:15 BST    1776   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:22:27 BST    1810   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:22:33 BST    1830  1000  1000   6 present   /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
Tue 2022-09-20 12:38:06 BST    1356   119   126   6 error     /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde

russh@russ-surfacepro:~$ sudo coredumpctl --output=info.coredump dump /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
[sudo] password for russh: 
           PID: 1356 (xdg-desktop-por)
           UID: 119 (sddm)
           GID: 126 (sddm)
        Signal: 6 (ABRT)
     Timestamp: Tue 2022-09-20 12:38:06 BST (3h 5min ago)
  Command Line: /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
    Executable: /usr/lib/x86_64-linux-gnu/libexec/xdg-desktop-portal-kde
 Control Group: /user.slice/user-119.slice/user@119.service/session.slice/plasma-xdg-desktop-portal-kde.service
          Unit: user@119.service
     User Unit: plasma-xdg-desktop-portal-kde.service
         Slice: user-119.slice
     Owner UID: 119 (sddm)
       Boot ID: 747385dd13e34c31b0fb29642547f417
    Machine ID: a9677a48223a4a1c8149d8f754cc79d6
      Hostname: russ-surfacepro
       Storage: /var/lib/systemd/coredump/core.xdg-desktop-por.119.747385dd13e34c31b0fb29642547f417.1356.1663673886000000000000.lz4
       Message: Process 1356 (xdg-desktop-por) of user 119 dumped core.
                
                Stack trace of thread 1356:
                #0  0x00007fa95a05100b __GI_raise (libc.so.6 + 0x4300b)
                #1  0x00007fa95a030859 __GI_abort (libc.so.6 + 0x22859)
                #2  0x00007fa95a292bd9 _ZNK14QMessageLogger5fatalEPKcz (libQt5Core.so.5 + 0x92bd9)
                #3  0x00007fa95b339d9b _ZN22QGuiApplicationPrivate25createPlatformIntegrationEv (libQt5Gui.so.5 + 0x139d9b)
                #4  0x00007fa95b33a218 _ZN22QGuiApplicationPrivate21createEventDispatcherEv (libQt5Gui.so.5 + 0x13a218)
                #5  0x00007fa95a4bbb06 _ZN23QCoreApplicationPrivate4initEv (libQt5Core.so.5 + 0x2bbb06)
                #6  0x00007fa95b33d333 _ZN22QGuiApplicationPrivate4initEv (libQt5Gui.so.5 + 0x13d333)
                #7  0x00007fa95c1741bd _ZN19QApplicationPrivate4initEv (libQt5Widgets.so.5 + 0x1741bd)
                #8  0x0000562f10ecbf25 n/a (xdg-desktop-portal-kde + 0x26f25)
                #9  0x00007fa95a032083 __libc_start_main (libc.so.6 + 0x24083)
                #10 0x0000562f10ecc26e n/a (xdg-desktop-portal-kde + 0x2726e)
                
                Stack trace of thread 1357:
                #0  0x00007fa95a12099f __GI___poll (libc.so.6 + 0x11299f)
                #1  0x00007fa9589d736e n/a (libglib-2.0.so.0 + 0x5236e)
                #2  0x00007fa9589d74a3 g_main_context_iteration (libglib-2.0.so.0 + 0x524a3)
                #3  0x00007fa95a50fb82 _ZN20QEventDispatcherGlib13processEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE (libQt5Core.so.5 + 0x30fb82)
                #4  0x00007fa95a4b3b3b _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE (libQt5Core.so.5 + 0x2b3b3b)
                #5  0x00007fa95a2cd342 _ZN7QThread4execEv (libQt5Core.so.5 + 0xcd342)
                #6  0x00007fa95b17af4b n/a (libQt5DBus.so.5 + 0x18f4b)
                #7  0x00007fa95a2ce543 n/a (libQt5Core.so.5 + 0xce543)
                #8  0x00007fa95bfa3609 start_thread (libpthread.so.0 + 0x8609)
                #9  0x00007fa95a12d133 __clone (libc.so.6 + 0x11f133)


and the core dump is here https://www.dropbox.com/s/zo5djq2bjoa1960/info.coredump?dl=0

Comment 3 Russ Hay 2022-09-21 12:27:23 UTC

today's updates from testing channel resolved this issue.