https://bugs.kde.org/show_bug.cgi?id=497222
Bug ID: 497222
Summary: ksplashqml and plasmashell crashed when Plasma started
in VMs with 3D acceleration enabled
Classification: Plasma
Product: plasmashell
Version: 6.2.4
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Keywords: qt6
Severity: normal
Priority: NOR
Component: generic-crash
Assignee: plasma-b...@kde.org
Reporter: matt.fagn...@bell.net
Target Milestone: 1.0
Created attachment 176453
--> https://bugs.kde.org/attachment.cgi?id=176453&action=edit
plasmashell trace screenshot
SUMMARY
I booted the Fedora Rawhide KDE live image
Fedora-KDE-Desktop-Live-Rawhide-20241208.n.0.x86_64.iso in QEMU/KVM VMs with 3D
acceleration enabled using the virgl mesa 24.3.1 driver in GNOME Boxes in a
Fedora 41 KDE installation. When Plasma 6.2.4 on Wayland was starting, the
startup sound played. There was a second mouse cursor in the middle of the VM
screen for a couple seconds which disappeared. The VM had a black screen
indefinitely after that. I switched to VT2 in the VM. ksplashqml and
plasmashell crashed when Plasma started. plasmashell crashed 3 times.
plasma-welcome also crashed. coredumpctl gdb showed those processes crashed in
dri2_query_image_common in mesa with the same kinds of traces. The plasmashell
trace had a null image pointer in dri2_query_image_common (and lower frames).
The crashing line in dri2_query_image_common was *value =
image->texture->width0; The crash might be due to a null pointer dereference
there. I took a screenshot of the plasmashell trace since I'm unsure how to
transfer text files out of the VM without Plasma starting. I'm writing out most
of the plasmashell trace from the attached screenshot as follows.
#0 __pthread_kill_implementation (threadid=<optimized out>,
signo=signo@entry=11, no_tid=no_tid@entry=0) at pthread_kill.c:44
#1 in __pthread_kill_internal (threadid=<optimized out>, signo=11) at
pthread_kill.c:89
#2 in __GI_raise (sig=11) at ../sysdeps/raise/posix.c:26
#3 in KCrash::defaultCrashHandler (sig=11) at
/usr/src/debug/kf6-kcrash-6.8.0-1.fc42.x86_64/src/kcrash.cpp:596
#4 <signal handler called>
#5 in dri2_query_image_common (image=0x0, attrib=8196, value=...) at
../src/gallium/frontends/dri/dri2.c:1211
#6 in dri2_query_image (image=0x0, attrib=8196, value=...) at
../src/gallium/frontends/dri/dri2.c:1410
#7 in create_wl_buffer (dri2_dpy=..., dri2_surf=..., image=0x0) at
../src/egl/drivers/dri2/wayland_platform.c:1471
#8 in dri2_wl_swap_buffers_with_damage (disp=..., draw=..., rects=0x0,
nrects=0) at ../src/egl/drivers/dri2/wayland_platform.c:1674
#9 in dri2_swap_buffers (disp=..., surf=...) at
../src/egl/drivers/dri2/egl_dri2.c:1659
#10 in eglSwapBuffers (dpy=..., surface=...) at ../src/egl/main/eglapi.c:1458
#11 in QtWaylandClient::QtWaylandGLContext::swapBuffers (this=..., surface=...)
at
/usr/src/debug/qt6-qtwayland-6.8.1-2.fc42.x86_64/src/hardwareintegration/client/wayland-egl/qwaylandglcontext.cpp:404
#12 in QRhiGles2::endFrame (this=..., swapChain=..., flags=...) at
/usr/src/debug/qt6-qtbase-6.8.1-4.fc42.x86_64/src/gui/rhi/qrhigles2.cpp:2166
#13 in QRhi::endFrame (this=..., swapChain=..., flags=...) at
/usr/src/debug/qt6-qtbase-6.8.1-4.fc42.x86_64/src/gui/rhi/qrhi.cpp:10878
#14 in QSGRenderThread::syncAndRender (this=...) at
/usr/include/qt6/QtCore/qtflags.h:73
#15 in QSGRenderThread::run (this=...) at
/usr/src/debug/qt6-qtdeclarative-6.8.1-5.fc42.x86_64/src/quick/scenegraph/qsgthreadedrenderloop.cpp:975
...
This problem happened 3/3 boots of that image with 3D acceleration enabled.
When I ran sudo systemctl restart sddm from VT2, the same crashes happened. The
problem didn't happen with 3D acceleration disabled using the llvmpipe mesa
driver. So the problem might involve the virgl driver in mesa 24.3.1. The
problem might also involve Qt 6.8.1 which was just updated in Rawhide. This
issue didn't happen with a Fedora Rawhide image from November 29 with Plasma
6.2.4, KF 6.8.0, Qt 6.8.0, and mesa 24.3.0.
STEPS TO REPRODUCE
1. Download the Fedora Rawhide KDE live image
Fedora-KDE-Desktop-Live-Rawhide-20241208.n.0.x86_64.iso from
https://koji.fedoraproject.org/koji/buildinfo?buildID=2598435 in a Fedora 41
KDE installation
2. Boot Fedora-KDE-Desktop-Live-Rawhide-20241208.n.0.x86_64.iso in a QEMU/KVM
VM with 3D acceleration enabled, 4 GiB RAM, UEFI enabled in GNOME Boxes
3.
OBSERVED RESULT
ksplashqml and plasmashell crashed when Plasma started in VMs with 3D
acceleration enabled
EXPECTED RESULT
Plasma should've started normally
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Rawhide
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.1
ADDITIONAL INFORMATION
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