hello,
I updated debian to buster, but now I'm getting some problems with plasma.

Sometimes while I use it, the bottom panel disappears or my current window automatically enters full-screen mode, after 2 or 3 seconds everything gets back to normal.
Other times when the panel disappears it doesn't appear in some seconds and, If I try to move the window, everything is black behind it. After I can just switch to CLI and reboot the system.
I also noticed that after I log in and the desktop is loaded the wallpaper turns black for 1 or 2 seconds.

plasmashell 5.14.5

any idea?
Thanks

I also noticed it crashes when I try to remove widgets from the desktop or from the panel, the panel disappears and appears again and sooner or later it crashes completely.

And when I try to remove the panel it disappears and appears again. I can't remove it.

How can I debug plasma?

To update I executed

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apt-get dist-upgrade

about logs:
when the panel disappears and appears again It doesn't log anything strange.
But when everything behind windows gets black it logs:

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May 26 15:32:16 debian-giovanni kernel: show_signal_msg: 7 callbacks suppressed
May 26 15:32:16 debian-giovanni kernel: plasmashell[4466]: segfault at 8 ip 00007f6256a44b77 sp 00007ffe3e778a20 error 4 in libQt5Core.so.5.12.5[7f6256818000+2d1000]
May 26 15:32:16 debian-giovanni kernel: Code: ff 49 89 c4 e9 a3 a0 de ff 48 89 c7 e9 b2 a0 de ff 66 90 41 57 41 56 49 89 d6 41 55 49 89 f5 41 54 55 48 89 fd 53 48 83 ec 78 <48> 8b 5f 08 64 48 8b 04 25 28 00 00 00 48 89 44 24 68 31 c0 48 8b

and this is my /etc/apt/sources.list

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#

# deb cdrom:[Debian GNU/Linux 9.7.0 _Stretch_ - Official amd64 NETINST 20190123-19:36]/ stretch main

# deb cdrom:[Debian GNU/Linux 9.7.0 _Stretch_ - Official amd64 NETINST 20190123-19:36]/ stretch main

deb http://deb.debian.org/debian buster main contrib non-free
deb-src http://deb.debian.org/debian buster main contrib non-free

deb http://deb.debian.org/debian-security/ buster/updates main contrib non-free
deb-src http://deb.debian.org/debian-security/ buster/updates main contrib non-free

deb http://deb.debian.org/debian buster-updates main contrib non-free
deb-src http://deb.debian.org/debian buster-updates main contrib non-free

# stretch-updates, previously known as 'volatile'
# deb http://ftp.it.debian.org/debian/ stretch-updates main contrib non-free
# deb-src http://ftp.it.debian.org/debian/ stretch-updates main contrib non-free


Hi!

Do you use your old profile from kde4? You should try plasma with a new user profile (in parallel) to eleminate old config problems. If the issues remain, try to use KDebug to get more details, specially for the segfault which should not happen.

I do not use Debian, so I do not know the correct program names, but it should be kdebugdialog5 to graphically set up basic debug output for kde-programs and kdebugsettings for more details. I'll prefer the last one.

If Debian is now on systemd too, you may use

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journalctl -b -xep 0..4

which will output all errors and warnings since last boot.

I found that libQt5Core.so.5.12.5 isn't a stable package, I don't know why it was installed, I solved updating everything to Bullseye.
Thanks