Created attachment 173300 [details] backtrace of crash SUMMARY This sequence of steps crashes plasmashell on both bare metal Tuxedo OS with git master session of workspace, and stock Fedora 40 in a vm. Crash is very consistently reproducible. Terminal output at time of crash is: QWaylandDataOffer: timeout reading from pipe QWaylandDataOffer: error reading data for mimeType text/x-plasmoidservicename Top lines of backtrace: #0 QMimeData::hasImage() const (this=this@entry=0x55555f9f5be0) at ./src/corelib/tools/qarraydatapointer.h:439 #1 0x00007ffff5bb4e33 in QWaylandMimeHelper::getByteArray(QMimeData*, QString const&) (mimeData=0x55555f9f5be0, mimeType=...) at ./src/shared/qwaylandmimehelper.cpp:18 #2 0x00007ffff5ba4db9 in QtWaylandClient::QWaylandDataSource::data_source_send(QString const&, int) (this=<optimized out>, mime_type=<optimized out>, fd=137) at ./src/client/qwaylanddatasource.cpp:46 #3 0x00007ffff5be3faa in QtWayland::wl_data_source::handle_send(void*, wl_data_source*, char const*, int) (data=0x55555f4369e0, object=<optimized out>, mime_type=0x7fffdc05e98c "text/x-plasmoidservicename", fd=137) at ./obj-x86_64-linux-gnu/src/client/qwayland-wayland.cpp:756 #4 0x00007ffff68dfe2e in ffi_call_unix64 () at ../src/x86/unix64.S:105 #5 0x00007ffff68dc493 in ffi_call_int (cif=<optimized out>, fn=<optimized out>, rvalue=<optimized out>, avalue=<optimized out>, closure=<optimized out>) at ../src/x86/ffi64.c:672 #6 0x00007ffff7c1e611 in wl_closure_invoke (closure=closure@entry=0x7fffdc05e8b0, flags=flags@entry=1, target=<optimized out>, target@entry=0x55555f23db90, opcode=opcode@entry=1, data=<optimized out>) at ../../src/wayland/src/connection.c:1236 #7 0x00007ffff7c1a331 in dispatch_event (display=display@entry=0x55555568fb60, queue=queue@entry=0x55555568fc58) at ../../src/wayland/src/wayland-client.c:1681 #8 0x00007ffff7c1b443 in dispatch_queue (queue=0x55555568fc58, display=0x55555568fb60) at ../../src/wayland/src/wayland-client.c:1827 #9 wl_display_dispatch_queue_pending (display=0x55555568fb60, queue=0x55555568fc58) at ../../src/wayland/src/wayland-client.c:2069 STEPS TO REPRODUCE 1. Add Show Activity Manager (or on Plasme 6.1, Activities) widget to the panel; make sure that two activities exist 2. Open Widget Explorer by right-clicking the panel and selecting "Add or Manage Widgets…" (in Plasma 6.1, "Add Widgets…" 3. Drag Analog Clock from the Widget Explorer over the Show Activity Manager widget and hover a bit so the sidebar pops up - this may sometimes require leaving and reentering the widget with the mouse OBSERVED RESULT Crash EXPECTED RESULT No Crash SOFTWARE/OS VERSIONS KDE Plasma Version: 6.1.80 KDE Frameworks Version: 6.6.0 according to kinfo (but this is from a dev session with workspace kde-built earlier today) Qt Version: 6.7.2 ADDITIONAL INFORMATION Fedora backtrace seems similar; the crash also tends to crash drkonqui so it's a bit tough to get a good one. I can try harder if that would help. (Attached backtrace is from running plasmashell in gdb)
Created attachment 173301 [details] another backtrace For the sake of completeness, here's another crash backtrace that seems mostly similar (but with some of the top lines different). Symbols are not quite as nice. I thought that I triggered this crash only with the Sticky Notes widget, but I can't reproduce this anymore - I had the two widgets right next to each other, and it's possible that Show Activity Manager was the culprit then as well and it only seemed like sticky notes caused it because the crash is delayed. I now suspect that it's the same thing.
It looks like dragging over the applet (can also be on desktop) closes the widget explorer and I assume the Drag object is deleted.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/2498
Git commit d4b87ac6f4d2c323be149c03a61959fc74d6435c by David Redondo. Committed on 04/09/2024 at 12:56. Pushed by davidre into branch 'master'. applets/showActivityManager: Only show activityManager when drag contains windows It doesn't make sense to show it on something that can't be dropped into it. This fixes the crash in the mentioned bug but there is a more general issue that applets can interfere with the edit mode widget dragging. FIXED-IN:6.1.5 M +5 -1 applets/showActivityManager/package/contents/ui/main.qml M +12 -0 imports/activitymanager/switcherbackend.cpp M +1 -0 imports/activitymanager/switcherbackend.h https://invent.kde.org/plasma/plasma-desktop/-/commit/d4b87ac6f4d2c323be149c03a61959fc74d6435c
Git commit c75143b89a2ae68b2b0fc75b8844ca9dedf8de59 by David Redondo. Committed on 18/09/2024 at 13:13. Pushed by davidre into branch 'Plasma/6.1'. applets/showActivityManager: Only show activityManager when drag contains windows It doesn't make sense to show it on something that can't be dropped into it. This fixes the crash in the mentioned bug but there is a more general issue that applets can interfere with the edit mode widget dragging. FIXED-IN:6.1.5 (cherry picked from commit d4b87ac6f4d2c323be149c03a61959fc74d6435c) Co-authored-by: David Redondo <kde@david-redondo.de> M +5 -1 applets/showActivityManager/package/contents/ui/main.qml M +12 -0 imports/activitymanager/switcherbackend.cpp M +1 -0 imports/activitymanager/switcherbackend.h https://invent.kde.org/plasma/plasma-desktop/-/commit/c75143b89a2ae68b2b0fc75b8844ca9dedf8de59