[Bug 1869280] [NEW] Plasma system settings app crashes when selecting Virtual Desktops menu item

Matthew Miller 1869280 at bugs.launchpad.net
Fri Mar 27 00:30:32 UTC 2020


Public bug reported:

On Kubuntu 20.04 Focal Fossa fresh installed using March 26th amd64
daily image and updated using Discover. I expected the virtual desktop
options to display in the system setttings window, however I could not
set the number of virtual desktops before system settings crashed.

Version:
apt-cache policy systemsettings
systemsettings:
  Installed: 4:5.18.3-0ubuntu1
  Candidate: 4:5.18.3-0ubuntu1
  Version table:
 *** 4:5.18.3-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status


Backtrace:

Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f8a19a9c800 (LWP 3130))]

Thread 6 (Thread 0x7f8a01a0a700 (LWP 3143)):
#0  __GI___libc_read (nbytes=16, buf=0x7f8a01a09b70, fd=31) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=31, buf=0x7f8a01a09b70, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f8a1bccd89f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8a1bc84cfe in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8a1bc85152 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f8a1bc852e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f8a1df458c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8a1deec82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8a1dd25775 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8a1cfdb3a9 in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f8a1dd269c2 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f8a1c569609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007f8a1d9b7153 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7f8a08f03700 (LWP 3134)):
#0  0x00007f8a1bcd233d in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8a1bc84d6a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8a1bc85240 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8a1bc852e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8a1df458c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8a1deec82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8a1dd25775 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8a1cfdb3a9 in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f8a1dd269c2 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8a1c569609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007f8a1d9b7153 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f8a0b4af700 (LWP 3133)):
#0  0x00007f8a1bc84732 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f8a1bc850db in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f8a1bc852e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8a1df458c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007f8a1deec82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8a1dd25775 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007f8a1cfdb3a9 in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f8a1dd269c2 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8a1c569609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#9  0x00007f8a1d9b7153 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f8a13a76700 (LWP 3132)):
#0  __GI___libc_read (nbytes=16, buf=0x7f8a13a75b60, fd=6) at ../sysdeps/unix/sysv/linux/read.c:26
#1  __GI___libc_read (fd=6, buf=0x7f8a13a75b60, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:24
#2  0x00007f8a1bccd89f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f8a1bc84cfe in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f8a1bc85152 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f8a1bc852e3 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f8a1df458c3 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007f8a1deec82b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007f8a1dd25775 in QThread::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007f8a1e1c7efa in ?? () from /lib/x86_64-linux-gnu/libQt5DBus.so.5
#10 0x00007f8a1dd269c2 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f8a1c569609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007f8a1d9b7153 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f8a18be8700 (LWP 3131)):
#0  0x00007f8a1d9aa9bf in __GI___poll (fds=0x7f8a18be7ca8, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f8a1c526c1a in ?? () from /lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f8a1c52887a in xcb_wait_for_event () from /lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f8a193f21a8 in ?? () from /lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007f8a1dd269c2 in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007f8a1c569609 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007f8a1d9b7153 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f8a19a9c800 (LWP 3130)):
[KCrash Handler]
#6  0x00007f8a1ce471d2 in QV4::QObjectWrapper::wrap(QV4::ExecutionEngine*, QObject*) () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007f8a1cef0bf8 in QV4::ExecutionEngine::fromVariant(QVariant const&) () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f8a1ce448cd in ?? () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007f8a1ce45770 in QV4::QQmlContextWrapper::getPropertyAndBase(QV4::QQmlContextWrapper const*, QV4::PropertyKey, QV4::Value const*, bool*, QV4::Value*, QV4::Lookup*) () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#10 0x00007f8a1ce460b4 in QV4::QQmlContextWrapper::resolveQmlContextPropertyLookupGetter(QV4::Lookup*, QV4::ExecutionEngine*, QV4::Value*) () from /lib/x86_64-linux-gnu/libQt5Qml.so.5
#11 0x00007f8a032e6365 in ?? ()
#12 0x0000000000000000 in ?? ()
[Inferior 1 (process 3130) detached]

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: systemsettings 4:5.18.3-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-18.22-generic 5.4.24
Uname: Linux 5.4.0-18-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu21
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Mar 26 20:24:04 2020
InstallationDate: Installed on 2020-03-26 (0 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200326)
SourcePackage: systemsettings
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: systemsettings (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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https://bugs.launchpad.net/bugs/1869280

Title:
  Plasma system settings app crashes when selecting Virtual Desktops
  menu item

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