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My Trixie upgrade experience - not great, not terrible (KDE segfault)

"Only" two major issues:
First, a realtek dkms driver I installed from source blocked kernel update (this one is my fault obviously).
Second, a Plasma 6 segfault/crash after upgrade and login. It was a half-crash because toolbars were gone but I could still launch programs via search. 

This got me very worried because nothing is mentioned in
the upgrade wiki about such an issue. On my spare profile, I managed to solve it by deleting ~/.config/plasma-org.kde.plasma.desktop-appletsrc
On my main profile, I didn't want to lose my settings so I did some more debugging:
- crash only happened when I turned on my second monitor or booted with all 3 turned on
- decided to try clearing cache only with rm -rf ~/.cache/plasmashell and re-login, it worked.
Well, I think this is what I did.. or maybe it somehow resolved itself by sheer magic.
According to stacktrace, it seems like something with SVG/wallpaper is the core issue 


Stack trace of thread 13940:
                                             #0 0x00007f3b5ff14bd9 n/a (libQt6Gui.so.6 + 0x514bd9)                                              #1 0x00007f3b5fb8de6e _ZN6QImage4fillEN2Qt11GlobalColorE (libQt6Gui.so.6 + 0x18de6e)                                              #2 0x00007f3b5e257270 _ZN8QSvgNode14drawIntoBufferEP8QPainterR15QSvgExtraStatesRK5QRect (libQt6Svg.so.6 + 0x55270)                                              #3 0x00007f3b5e258da0 _ZN8QSvgNode4drawEP8QPainterR15QSvgExtraStates (libQt6Svg.so.6 + 0x56da0)                                              #4 0x00007f3b5e2634bc _ZN5QSvgG11drawCommandEP8QPainterR15QSvgExtraStates (libQt6Svg.so.6 + 0x614bc)                                              #5 0x00007f3b5e2585e6 _ZN8QSvgNode4drawEP8QPainterR15QSvgExtraStates (libQt6Svg.so.6 + 0x565e6)                                              #6 0x00007f3b5e2634bc _ZN5QSvgG11drawCommandEP8QPainterR15QSvgExtraStates (libQt6Svg.so.6 + 0x614bc)                                              #7 0x00007f3b5e2585e6 _ZN8QSvgNode4drawEP8QPainterR15QSvgExtraStates (libQt6Svg.so.6 + 0x565e6)                                              #8 0x00007f3b5e26f305 _ZN16QSvgTinyDocument4drawEP8QPainterRK6QRectF (libQt6Svg.so.6 + 0x6d305)                                              #9 0x00007f3b61d19c27 n/a (libKF6Svg.so.6 + 0x21c27)                                              #10 0x00007f3b61d1b179 _ZN4KSvg3Svg5imageERK5QSizeRK7QString (libKF6Svg.so.6 + 0x23179)                                              #11 0x00007f3ae51e7ab7 n/a (libplasma_wallpaper_imageplugin.so + 0x4fab7)                                              #12 0x00007f3b5f6e2a5d n/a (libQt6Core.so.6 + 0x2e2a5d)                                              #13 0x00007f3b5f6e11ea n/a (libQt6Core.so.6 + 0x2e11ea)                                              #14 0x00007f3b5ee9cb7b start_thread (libc.so.6 + 0x92b7b)                                              #15 0x00007f3b5ef1a7b8 __clone3 (libc.so.6 + 0x1107b8)
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