Bug 405751

Summary: plasma shell crash when I clicked on [Leave] menu
Product: [Plasma] plasmashell Reporter: jacky lau <jacky>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED MOVED    
Severity: crash CC: plasma-bugs-null
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.15.3   
Target Milestone: 1.0   
Platform: Neon   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description jacky lau 2019-03-22 10:49:46 UTC 
Application: plasmashell (5.15.3)

Qt Version: 5.12.0
Frameworks Version: 5.56.0
Operating System: Linux 4.18.0-16-generic x86_64
Distribution: KDE neon User Edition 5.15

-- Information about the crash:
- What I was doing when the application crashed:

I setup a multi-seat system on my PC, but if I login on seat-1, plasma shell crash when I clicked on [Leave] menu

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd397f10880 (LWP 21353))]

Thread 19 (Thread 0x7fd3080d9700 (LWP 21920)):
#0  0x00007fd391345bf9 in __GI___poll (fds=0x7fd300006470, nfds=1, timeout=3208630) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fd38b1ac539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd38b1ac64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd391c8815b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd391c2964a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd391a5141a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd309305f77 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#7  0x00007fd391a52bc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd38e5676db in start_thread (arg=0x7fd3080d9700) at pthread_create.c:463
#9  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7fd347734700 (LWP 21533)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd91655940) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd916558f0, cond=0x55fd91655918) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd91655918, mutex=0x55fd916558f0) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd347734700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7fd35affd700 (LWP 21520)):
#0  0x00007fd391c87e6d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007fd38b1aba98 in g_main_context_prepare () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd38b1ac46b in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd38b1ac64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd391c8815b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd391c2964a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd391a5141a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd395d0e1c6 in QQuickPixmapReader::run (this=0x55fd90a61c00) at util/qquickpixmapcache.cpp:949
#8  0x00007fd391a52bc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fd38e5676db in start_thread (arg=0x7fd35affd700) at pthread_create.c:463
#10 0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7fd35b7fe700 (LWP 21434)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dffdb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dffd68, cond=0x55fd90dffd90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dffd90, mutex=0x55fd90dffd68) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd35b7fe700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fd3577fe700 (LWP 21431)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dffdb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dffd68, cond=0x55fd90dffd90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dffd90, mutex=0x55fd90dffd68) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd3577fe700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fd35bfff700 (LWP 21429)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dffdb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dffd68, cond=0x55fd90dffd90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dffd90, mutex=0x55fd90dffd68) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd35bfff700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fd360ff9700 (LWP 21428)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dffdb8) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dffd68, cond=0x55fd90dffd90) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dffd90, mutex=0x55fd90dffd68) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd360ff9700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fd3617fa700 (LWP 21427)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dff83c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dff7e8, cond=0x55fd90dff810) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dff810, mutex=0x55fd90dff7e8) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd3617fa700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fd361ffb700 (LWP 21426)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dff838) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dff7e8, cond=0x55fd90dff810) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dff810, mutex=0x55fd90dff7e8) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd361ffb700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fd3627fc700 (LWP 21425)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dff83c) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dff7e8, cond=0x55fd90dff810) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dff810, mutex=0x55fd90dff7e8) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd3627fc700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fd362ffd700 (LWP 21424)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dff838) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dff7e8, cond=0x55fd90dff810) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dff810, mutex=0x55fd90dff7e8) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd362ffd700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fd3637fe700 (LWP 21423)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dff838) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dff7e8, cond=0x55fd90dff810) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dff810, mutex=0x55fd90dff7e8) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd3637fe700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fd363fff700 (LWP 21422)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dff838) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dff7e8, cond=0x55fd90dff810) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dff810, mutex=0x55fd90dff7e8) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd363fff700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fd368a85700 (LWP 21421)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90ce5d98) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90ce5d48, cond=0x55fd90ce5d70) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90ce5d70, mutex=0x55fd90ce5d48) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd368a85700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fd369286700 (LWP 21420)):
#0  0x00007fd38e56d9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x55fd90dfc998) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x55fd90dfc948, cond=0x55fd90dfc970) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x55fd90dfc970, mutex=0x55fd90dfc948) at pthread_cond_wait.c:655
#3  0x00007fd36e36ae6b in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#4  0x00007fd36e36ab97 in ?? () from /usr/lib/x86_64-linux-gnu/dri/radeonsi_dri.so
#5  0x00007fd38e5676db in start_thread (arg=0x7fd369286700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fd37bfff700 (LWP 21405)):
#0  0x00007fd3913410b4 in __GI___libc_read (fd=12, buf=0x7fd37bffeaf0, nbytes=16) at ../sysdeps/unix/sysv/linux/read.c:27
#1  0x00007fd38b1f0cd0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd38b1ac027 in g_main_context_check () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd38b1ac4e0 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd38b1ac64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fd391c8815b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd391c2964a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fd391a5141a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd3958492e5 in QQmlThreadPrivate::run (this=0x55fd90aa3400) at qml/ftw/qqmlthread.cpp:148
#9  0x00007fd391a52bc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fd38e5676db in start_thread (arg=0x7fd37bfff700) at pthread_create.c:463
#11 0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fd382215700 (LWP 21386)):
#0  0x00007fd391345bf9 in __GI___poll (fds=0x7fd37401b5a0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fd38b1ac539 in ?? () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd38b1ac64c in g_main_context_iteration () from /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd391c8815b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fd391c2964a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd391a5141a in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fd392d2f015 in QDBusConnectionManager::run (this=0x7fd392fa6d80 <(anonymous namespace)::Q_QGS__q_manager::innerFunction()::holder>) at qdbusconnection.cpp:178
#7  0x00007fd391a52bc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fd38e5676db in start_thread (arg=0x7fd382215700) at pthread_create.c:463
#9  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fd383d69700 (LWP 21370)):
#0  0x00007fd391345bf9 in __GI___poll (fds=0x7fd383d68c38, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fd396963747 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fd39696536a in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fd384cba32a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fd391a52bc2 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fd38e5676db in start_thread (arg=0x7fd383d69700) at pthread_create.c:463
#6  0x00007fd39135288f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fd397f10880 (LWP 21353)):
[KCrash Handler]
#6  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#7  0x00007fd391271801 in __GI_abort () at abort.c:79
#8  0x00007fd38cb05204 in _dbus_abort () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#9  0x00007fd38cafba90 in _dbus_warn_check_failed () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#10 0x00007fd38caeb929 in dbus_message_new_method_call () from /lib/x86_64-linux-gnu/libdbus-1.so.3
#11 0x00007fd392d45f15 in q_dbus_message_new_method_call (method=<optimized out>, interface=<optimized out>, path=<optimized out>, bus_name=<optimized out>) at qdbus_symbols_p.h:379
#12 QDBusMessagePrivate::toDBusMessage (message=..., capabilities=..., error=error@entry=0x7fff74ca2a60) at qdbusmessage.cpp:139
#13 0x00007fd392d4105e in QDBusConnectionPrivate::sendWithReplyAsync (this=this@entry=0x55fd90a99f10, message=..., receiver=receiver@entry=0x0, returnMethod=returnMethod@entry=0x0, errorMethod=errorMethod@entry=0x0, timeout=timeout@entry=-1) at qdbusintegrator.cpp:2128
#14 0x00007fd392d4201c in QDBusConnectionPrivate::sendWithReply (this=this@entry=0x55fd90a99f10, message=..., sendMode=sendMode@entry=1, timeout=timeout@entry=-1) at qdbusintegrator.cpp:2032
#15 0x00007fd392d427ed in QDBusConnectionPrivate::findMetaObject (this=0x55fd90a99f10, service=..., path=..., interface=..., error=...) at qdbusintegrator.cpp:2532
#16 0x00007fd392d4dd4d in QDBusInterfacePrivate::QDBusInterfacePrivate (this=0x55fd93b8e2a0, serv=..., p=..., iface=..., con=...) at qdbusinterface.cpp:156
#17 0x00007fd392d4dec5 in QDBusInterface::QDBusInterface (this=0x7fff74ca2e10, service=..., path=..., interface=..., connection=..., parent=0x0) at qdbusinterface.cpp:218
#18 0x00007fd396eca297 in LightDMDBus::LightDMDBus (this=0x7fff74ca2e10) at ./libkworkspace/kdisplaymanager.cpp:279
#19 0x00007fd396ec189a in KDisplayManager::KDisplayManager (this=0x7fff74ca2ee0) at ./libkworkspace/kdisplaymanager.cpp:313
#20 0x00007fd34c1dd330 in SystemEntry::init (this=0x55fd93b8d8f0) at ./applets/kicker/plugin/systementry.cpp:93
#21 0x00007fd34c1de644 in SystemModel::init (this=this@entry=0x55fd93b8d6f0) at ./applets/kicker/plugin/systemmodel.cpp:58
#22 0x00007fd34c1de81c in SystemModel::SystemModel (this=0x55fd93b8d6f0, parent=<optimized out>) at ./applets/kicker/plugin/systemmodel.cpp:32
#23 0x00007fd34c1c4710 in QQmlPrivate::QQmlElement<SystemModel>::QQmlElement (this=0x55fd93b8d6f0) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:98
#24 QQmlPrivate::createInto<SystemModel> (memory=0x55fd93b8d6f0) at /usr/include/x86_64-linux-gnu/qt5/QtQml/qqmlprivate.h:119
#25 0x00007fd3957c7c42 in QQmlType::create (this=this@entry=0x7fff74ca30e0, out=out@entry=0x7fff74ca30d8, memory=memory@entry=0x7fff74ca30e8, additionalMemory=additionalMemory@entry=144) at qml/qqmlmetatype.cpp:1049
#26 0x00007fd39582fe28 in QQmlObjectCreator::createInstance (this=this@entry=0x55fd9396e140, index=1, parent=0x55fd93b76630, isContextObject=isContextObject@entry=false) at qml/qqmlobjectcreator.cpp:1163
#27 0x00007fd39582e740 in QQmlObjectCreator::setPropertyBinding (this=this@entry=0x55fd9396e140, bindingProperty=0x7fd37061e328, binding=binding@entry=0x7fd36010d574) at qml/qqmlobjectcreator.cpp:825
#28 0x00007fd39582ee6b in QQmlObjectCreator::setupBindings (this=this@entry=0x55fd9396e140, applyDeferredBindings=applyDeferredBindings@entry=false) at qml/qqmlobjectcreator.cpp:777
#29 0x00007fd39582fa4b in QQmlObjectCreator::populateInstance (this=this@entry=0x55fd9396e140, index=-1, index@entry=0, instance=0x0, bindingTarget=0x0, valueTypeProperty=valueTypeProperty@entry=0x0) at qml/qqmlobjectcreator.cpp:1461
#30 0x00007fd3958304af in QQmlObjectCreator::createInstance (this=this@entry=0x55fd9396e140, index=index@entry=0, parent=parent@entry=0x0, isContextObject=isContextObject@entry=true) at qml/qqmlobjectcreator.cpp:1299
#31 0x00007fd395830c4c in QQmlObjectCreator::create (this=0x55fd9396e140, subComponentIndex=<optimized out>, parent=parent@entry=0x0, interrupt=interrupt@entry=0x7fff74ca3870) at qml/qqmlobjectcreator.cpp:203
#32 0x00007fd3957b2668 in QQmlIncubatorPrivate::incubate (this=0x55fd93b7bd60, i=...) at qml/qqmlincubator.cpp:299
#33 0x00007fd3957b2f8c in QQmlEnginePrivate::incubate (this=this@entry=0x55fd90993400, i=..., forContext=forContext@entry=0x55fd93b7bca0) at qml/qqmlincubator.cpp:89
#34 0x00007fd3957af88c in QQmlComponent::create (this=<optimized out>, incubator=..., context=<optimized out>, forContext=forContext@entry=0x0) at qml/qqmlcomponent.cpp:1058
#35 0x00007fd395e7ce54 in QQuickLoaderPrivate::_q_sourceLoaded (this=this@entry=0x55fd92b9f5d0) at items/qquickloader.cpp:739
#36 0x00007fd395e7cfe0 in QQuickLoaderPrivate::load (this=0x55fd92b9f5d0) at items/qquickloader.cpp:614
#37 0x00007fd395e7e07f in QQuickLoader::setSource (url=..., this=0x55fd92b9f510) at items/qquickloader.cpp:408
#38 QQuickLoader::qt_static_metacall (_o=_o@entry=0x55fd92b9f510, _c=_c@entry=QMetaObject::WriteProperty, _id=_id@entry=1, _a=_a@entry=0x7fff74ca3b10) at .moc/moc_qquickloader_p.cpp:258
#39 0x00007fd395e7e1e3 in QQuickLoader::qt_metacall (this=0x55fd92b9f510, _c=QMetaObject::WriteProperty, _id=1, _a=0x7fff74ca3b10) at .moc/moc_qquickloader_p.cpp:314
#40 0x00007fd39579499e in QQmlVMEMetaObject::metaCall (this=0x55fd92b9f7b0, o=<optimized out>, c=QMetaObject::WriteProperty, _id=45, a=0x7fff74ca3b10) at qml/qqmlvmemetaobject.cpp:981
#41 0x00007fd3957abb32 in QQmlPropertyData::writeProperty (this=this@entry=0x7fd37007e108, target=target@entry=0x55fd92b9f510, value=value@entry=0x7fff74ca3b90, flags=...) at ../../include/QtQml/5.12.0/QtQml/private/../../../../../src/qml/qml/qqmlpropertycache_p.h:350
#42 0x00007fd3957a9650 in QQmlPropertyPrivate::write (object=object@entry=0x55fd92b9f510, property=..., value=..., context=<optimized out>, flags=..., flags@entry=...) at qml/qqmlproperty.cpp:1289
#43 0x00007fd3956f3e43 in QV4::QObjectWrapper::setProperty (engine=engine@entry=0x55fd90a91fe0, object=object@entry=0x55fd92b9f510, property=0x7fd37007e108, value=...) at jsruntime/qv4qobjectwrapper.cpp:565
#44 0x00007fd3956f4d6e in QV4::QObjectWrapper::setQmlProperty (engine=0x55fd90a91fe0, qmlContext=<optimized out>, object=0x55fd92b9f510, name=<optimized out>, revisionMode=QV4::QObjectWrapper::IgnoreRevision, value=...) at jsruntime/qv4qobjectwrapper.cpp:435
#45 0x00007fd3956f4f09 in QV4::QObjectWrapper::virtualPut (m=0x7fd37b3c05a0, id=..., value=..., receiver=0x7fd37b3c05a0) at jsruntime/qv4qobjectwrapper.cpp:721
#46 0x00007fd395771bf1 in QV4::Object::put (receiver=<optimized out>, v=..., name=0x7fd37b3c0598, this=0x7fd37b3c05a0) at jsruntime/qv4object_p.h:318
#47 QV4::Runtime::method_storeProperty (engine=0x55fd90a91fe0, object=..., nameIndex=<optimized out>, value=...) at jsruntime/qv4runtime.cpp:611
#48 0x00007fd34c09f92a in ?? ()
#49 0x0000000000000000 in ?? ()

Possible duplicates by query: bug 316358, bug 309485, bug 307445, bug 300246.

Reported using DrKonqi
Comment 1 jacky lau 2019-03-22 11:21:09 UTC 
I'm not using LightDM, I'm using sddm 0.17.0
Comment 2 jacky lau 2019-03-26 03:13:42 UTC 
After reading and tracing the code of plasmashell and sddm, I found this problem is cause by sddm failed to register "/org/freedesktop/DisplayManager/Seat-1" to dbus by using QDBusConnection::registerObject().
I change my seat name from seat-1 to seat_1, plasmashell wouldn't crash any more.
This is sddm's bug.