Bug 365211

Summary: Crash at attempt to assign short-cut to Default activity
Product: [Plasma] plasmashell Reporter: Oleh <ozabolotnyy>
Component: generalAssignee: David Edmundson <kde>
Status: RESOLVED FIXED    
Severity: crash CC: bshah, ozabolotnyy, plasma-bugs-null
Priority: NOR Keywords: drkonqi
Version First Reported In: 5.5.5   
Target Milestone: 1.0   
Platform: Ubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:
Attachments: reprosteps

Description Oleh 2016-07-07 20:02:59 UTC 
Application: plasmashell (5.5.5)

Qt Version: 5.5.1
Operating System: Linux 4.4.0-28-generic x86_64
Distribution: Ubuntu 16.04 LTS

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

- Custom settings of the application:

SETUP
1. login
2. click on the square pictogram in the left corner 
the "Show desctop; Add widget;  Activities ..." menu appears
3. click Activities / Edit the default activity/ switch to Others tab

STEPS
4. click the "record shortcat"
5. press win+tab keys

CURRENT RESULT
Plasma Crashes at attempt to assign the shortcat

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma (plasmashell), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fe21a47d8c0 (LWP 2635))]

Thread 10 (Thread 0x7fe13f7ff700 (LWP 2680)):
#0  0x00007fe214b82e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fe21191839c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe217b1b3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe2143656fa in start_thread (arg=0x7fe13f7ff700) at pthread_create.c:333
#9  0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 9 (Thread 0x7fe14506c700 (LWP 2679)):
#0  0x00007fe214b7e9cd in read () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fe21195b740 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe211917e84 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe211918340 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe217b1b3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe2143656fa in start_thread (arg=0x7fe14506c700) at pthread_create.c:333
#11 0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 8 (Thread 0x7fe153cbf700 (LWP 2645)):
#0  0x00007fe21195cac9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fe211917939 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe2119182cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe15619e7d7 in KCupsConnection::run() () from /usr/lib/x86_64-linux-gnu/libkcupslib.so
#8  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9  0x00007fe2143656fa in start_thread (arg=0x7fe153cbf700) at pthread_create.c:333
#10 0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 7 (Thread 0x7fe1e96b3700 (LWP 2644)):
#0  0x00007fe214b82e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fe21191839c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe2184a1ed6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe2143656fa in start_thread (arg=0x7fe1e96b3700) at pthread_create.c:333
#9  0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 6 (Thread 0x7fe1ebfff700 (LWP 2643)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fe219ec0bd4 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#2  0x00007fe219ec0c19 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Script.so.5
#3  0x00007fe2143656fa in start_thread (arg=0x7fe1ebfff700) at pthread_create.c:333
#4  0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 5 (Thread 0x7fe1f19f0700 (LWP 2642)):
#0  0x00007fe21195cac9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fe2119182a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe217b1b3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe2143656fa in start_thread (arg=0x7fe1f19f0700) at pthread_create.c:333
#9  0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 4 (Thread 0x7fe1f378e700 (LWP 2641)):
#0  0x00007fe214b82e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fe21191839c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe217b1b3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe2143656fa in start_thread (arg=0x7fe1f378e700) at pthread_create.c:333
#9  0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 3 (Thread 0x7fe1fedbf700 (LWP 2639)):
#0  0x00007fe215277837 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#1  0x00007fe2154aeffa in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#2  0x00007fe21191792d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fe2119182cb in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fe2154afa9b in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#6  0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7  0x00007fe2152738a4 in QThread::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8  0x00007fe217b1b3c5 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe2143656fa in start_thread (arg=0x7fe1fedbf700) at pthread_create.c:333
#11 0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7fe205647700 (LWP 2637)):
#0  0x00007fe214b82e8d in poll () at ../sysdeps/unix/syscall-template.S:84
#1  0x00007fe218c47c62 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007fe218c498d7 in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007fe207795629 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#4  0x00007fe21527884e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fe2143656fa in start_thread (arg=0x7fe205647700) at pthread_create.c:333
#6  0x00007fe214b8eb5d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7fe21a47d8c0 (LWP 2635)):
[KCrash Handler]
#6  0x00007fe217aa5870 in QQmlBoundSignalExpression::function() const () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#7  0x00007fe217aa5920 in QQmlBoundSignalExpression::sourceLocation() const () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007fe217a85788 in QQmlData::destroyed(QObject*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#9  0x00007fe21548fba4 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007fe21854f7f6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#12 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#15 0x00007fe21854ff36 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#16 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#18 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#19 0x00007fe21854ff36 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#20 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#21 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#22 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#23 0x00007fe21854ff36 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#24 0x00007fe217b5b1bb in QQmlDelegateModel::~QQmlDelegateModel() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#25 0x00007fe217b5b319 in QQmlDelegateModel::~QQmlDelegateModel() () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#26 0x00007fe2185c6856 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#27 0x00007fe2185c6869 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#28 0x00007fe21548fde8 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#30 0x00007fe218550a96 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#31 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#32 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#34 0x00007fe21854f39e in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#35 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#37 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#38 0x00007fe21854f666 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#39 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#41 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#42 0x00007fe21854f7f6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#43 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#44 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#45 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#46 0x00007fe21854ff36 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#47 0x00007fe21548652b in QObjectPrivate::deleteChildren() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#48 0x00007fe21548fda0 in QObject::~QObject() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#49 0x00007fe21853578d in QQuickItem::~QQuickItem() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#50 0x00007fe21854f7f6 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#51 0x00007fe215488ec0 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#52 0x00007fe21853370b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#53 0x00007fe215f5c05c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#54 0x00007fe215f61516 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#55 0x00007fe21545962b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#56 0x00007fe21545ba26 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#57 0x00007fe2154af673 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#58 0x00007fe2119181a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#59 0x00007fe211918400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#60 0x00007fe2119184ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#61 0x00007fe2154afa7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#62 0x00007fe215456dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#63 0x00007fe216156c7d in QDialog::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#64 0x00007fe144399b43 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/activities/settings/libkactivitiessettingsplugin.so
#65 0x00007fe217ad9319 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#66 0x00007fe217a5e67c in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#67 0x00007fe217a5febc in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#68 0x00007fe217a606cd in QV4::QObjectMethod::callInternal(QV4::CallData*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#69 0x00007fe217a770c3 in QV4::Runtime::callProperty(QV4::ExecutionEngine*, int, QV4::CallData*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#70 0x00007fe152e96968 in ?? ()
#71 0x0000000000000000 in ?? ()

Possible duplicates by query: bug 364186, bug 362173, bug 362145, bug 361469, bug 361401.

Reported using DrKonqi
Comment 1 David Edmundson 2016-07-07 21:59:04 UTC 
Can you confirm you can reproduce the crash every time by following those steps?
Comment 2 David Edmundson 2016-07-07 23:09:17 UTC 
#63 0x00007fe216156c7d in QDialog::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5 #64 0x00007fe144399b43 in ?? () from /usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/activities/settings/libkactivitiessettingsplugin.so

Didn't see that part. 

I fixed this ages ago.
Comment 3 Oleh 2016-07-12 04:41:46 UTC 
(In reply to David Edmundson from comment #1)
> Can you confirm you can reproduce the crash every time by following those
> steps?

Yes I can
Tried the repro-steps Igave in the bug description - it reproduces crash 100%
(see snapshots for details)
Comment 4 Oleh 2016-07-12 04:44:20 UTC 
Created attachment 100028 [details]
reprosteps

I updated my system but the bug still reproduces