Bug 516065

Summary:	[ANR] I cannot change my wallpaper, and it prevents PlasmaShell from being interactible-with
Product:	[Applications] systemsettings	Reporter:	Roke Julian Lockhart Beedell <4wy78uwh>
Component:	generic-crash	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	NEEDSINFO WAITINGFORINFO
Severity:	crash	CC:	akselmo
Priority:	NOR	Keywords:	drkonqi
Version First Reported In:	6.5.5
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
URL:	https://bugzilla.redhat.com/show_bug.cgi?id=2411805#c13
See Also:	https://bugzilla.redhat.com/show_bug.cgi?id=2440117 https://bugzilla.redhat.com/show_bug.cgi?id=2440118
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	New crash information added by DrKonqi

Description Roke Julian Lockhart Beedell 2026-02-16 00:53:17 UTC

Application: systemsettings (6.5.5)

ApplicationNotResponding [ANR]: true
Qt Version: 6.10.1
Frameworks Version: 6.22.0
Operating System: Linux 6.18.9-200.fc43.x86_64 x86_64
Windowing System: Wayland
Distribution: "Fedora Linux 43 (KDE Plasma Desktop Edition)"
DrKonqi: 6.5.5 [CoredumpBackend]

-- Information about the crash:
Last boot, I updated https://github.com/luisbocanegra/plasma-smart-video-wallpaper-reborn, acquired via plasma-discover-6.5.5-1.fc43.x86_64. Upon successful `qdbus-qt6 org.kde.LogoutPrompt /LogoutPrompt promptReboot`, when SDDM was automatically bypassed, as I've configured its KCM to do, I observed that PlasmaShell was not visible. Invoking it via BaSH didn't remediate this. To demonstrate, `time strace -Ttr qdbus-qt6 org.kde.plasmashell /PlasmaShell org.kde.PlasmaShell.activateLauncherMenu` fails, and returns:

> ~~~
> 00:49:27 (+     0.000027) futex(0x560ff83d3ad8, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 0, NULL, FUTEX_BITSET_MATCH_ANY) = 0 <24.986885>
> 00:49:52 (+    24.986928) futex(0x560ff83d3a90, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000010>
> 00:49:52 (+     0.000042) fstat(1, {st_mode=S_IFCHR|0600, st_rdev=makedev(0x88, 0x2), ...}) = 0 <0.000011>
> 00:49:52 (+     0.000045) write(1, "Error: org.freedesktop.DBus.Erro"..., 42Error: org.freedesktop.DBus.Error.NoReply
> ) = 42 <0.000013>
> 00:49:52 (+     0.000035) write(1, "Did not receive a reply. Possibl"..., 211Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
> ) = 211 <0.000010>
> 00:49:52 (+     0.000034) write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000009>
> 00:49:52 (+     0.000028) futex(0x7ffc29885570, FUTEX_WAIT_PRIVATE, 0, NULL) = 0 <0.000019>
> 00:49:52 (+     0.000050) write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000008>
> 00:49:52 (+     0.000026) futex(0x560ff83d0648, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000008>
> 00:49:52 (+     0.000025) futex(0x7f12543ff990, FUTEX_WAIT_BITSET, 20630, NULL, FUTEX_BITSET_MATCH_ANY) = 0 <0.000032>
> 00:49:52 (+     0.000151) exit_group(2) = ?
> 00:49:52 (+     0.000488) +++ exited with 2 +++
> 
> real    0m49.541s
> user    0m0.005s
> sys     0m0.009s
> ~~~

Consequently, I attempted to change wallapers, via the relevant KCM. However, doing so reproducibly causes this ANR.

Additional diagnostic information may be available at https://bugzilla.redhat.com/show_bug.cgi?id=2411805#c13.

The crash can be reproduced every time.

-- Backtrace (Reduced):
#5  __syscall_cancel_arch () at ../sysdeps/unix/sysv/linux/x86_64/syscall_cancel.S:52
#6  0x00007fbd6107bc3c in __internal_syscall_cancel (a1=<optimized out>, a2=<optimized out>, a3=<optimized out>, a4=<optimized out>, a5=a5@entry=0, a6=a6@entry=4294967295, nr=202) at cancellation.c:49
#7  0x00007fbd6107c2ac in __futex_abstimed_wait_common64 (private=0, futex_word=0x55a7e24c57d8, expected=<optimized out>, op=<optimized out>, abstime=0x0, cancel=true) at futex-internal.c:57
#8  __futex_abstimed_wait_common (futex_word=futex_word@entry=0x55a7e24c57d8, expected=<optimized out>, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0, cancel=cancel@entry=true) at futex-internal.c:87
#9  0x00007fbd6107c30f in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x55a7e24c57d8, expected=<optimized out>, clockid=clockid@entry=0, abstime=abstime@entry=0x0, private=private@entry=0) at futex-internal.c:139
#10 0x00007fbd6107e97e in __pthread_cond_wait_common (cond=0x55a7e24c57b8, mutex=0x55a7e24c5790, clockid=0, abstime=0x0) at pthread_cond_wait.c:421
#11 ___pthread_cond_wait (cond=0x55a7e24c57b8, mutex=0x55a7e24c5790) at pthread_cond_wait.c:453
#12 0x00007fbd618da234 in QWaitConditionPrivate::wait (this=0x55a7e24c5790, deadline=...) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/thread/qwaitcondition_unix.cpp:68
#13 QWaitCondition::wait (this=this@entry=0x55a7dfc3de70, mutex=mutex@entry=0x55a7dfc3de68, deadline=...) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/corelib/thread/qwaitcondition_unix.cpp:146
#14 0x00007fbd615a96b5 in QDBusPendingCallPrivate::waitForFinished (this=this@entry=0x55a7dfc3de20) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/dbus/qdbuspendingcall.cpp:207
#15 0x00007fbd6155c127 in QDBusConnectionPrivate::sendWithReply (this=this@entry=0x7fbd480016e0, message=..., mode=mode@entry=QDBus::Block, timeout=timeout@entry=-1) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/dbus/qdbusintegrator.cpp:2073
#16 0x00007fbd6155c418 in QDBusConnectionPrivate::findMetaObject (this=0x7fbd480016e0, service=..., path=..., interface=..., error=...) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/dbus/qdbusintegrator.cpp:2634
#17 0x00007fbd6157066c in QDBusInterfacePrivate::QDBusInterfacePrivate (serv=<optimized out>, p=<optimized out>, iface=<optimized out>, con=<optimized out>, this=0x55a7e0d112b0) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/dbus/qdbusinterface.cpp:123
#18 QDBusInterfacePrivate::QDBusInterfacePrivate (this=0x55a7e0d112b0, serv=<optimized out>, p=<optimized out>, iface=<optimized out>, con=<optimized out>) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/dbus/qdbusinterface.cpp:117
#19 0x00007fbd615707fc in QDBusInterface::QDBusInterface (this=this@entry=0x55a7e01934c0, service=..., path=..., interface=..., connection=..., parent=parent@entry=0x55a7e20b47d0) at /usr/src/debug/qt6-qtbase-6.10.1-3.fc43.x86_64/src/dbus/qdbusinterface.cpp:187
#20 0x00007fbd2aa13390 in WallpaperModule::save (this=0x55a7e20b47d0) at /usr/include/qt6/QtCore/qarraydatapointer.h:452


Reported using DrKonqi

Comment 1 Roke Julian Lockhart Beedell 2026-02-16 00:53:18 UTC

Created attachment 189633 [details]
New crash information added by DrKonqi

DrKonqi auto-attaching complete backtrace.

Comment 2 Roke Julian Lockhart Beedell 2026-02-16 01:08:40 UTC

I have reproduced this at https://bugzilla.redhat.com/show_bug.cgi?id=2440117#c0, too.

Comment 3 Roke Julian Lockhart Beedell 2026-02-16 01:12:33 UTC

This also affects Qt's DBusViewer, per https://bugzilla.redhat.com/show_bug.cgi?id=2440118#c0.

Comment 4 Akseli Lahtinen 2026-02-16 09:36:26 UTC

Does the issue go away if you change back to 1st party wallpaper plugin (like default picture wallpaper) instead of using 3rd party video wallpaper plugin?

Comment 5 Roke Julian Lockhart Beedell 2026-02-16 10:33:44 UTC

(In reply to Akseli Lahtinen from comment #4)

> Does the issue go away if you change back to 1st party wallpaper plugin
> (like default picture wallpaper) instead of using 3rd party video wallpaper
> plugin?

Attempting to change to a default wallpaper is what caused this. It was already set as PSVWB, so I couldn't switch off it, to Plain Colour. However, this problem remediated itself the next time I logged-out.