Jan Kundrát has uploaded a new change for review.
https://gerrit.vesnicky.cesnet.cz/r/415
Change subject: Fix segfault in KWin when all screens disappear
......................................................................
Fix segfault in KWin when all screens disappear
This is due to changes in Qt 5.5; they now attempt to gracefully handle
a situation where all screens disappear, e.g., when user disables all
outputs via xrandr. Without this patch (and with [1] and [2] in place),
here's how KWin ended up:
#0 xcb_send_request (c=0x0, flags=flags@entry=0,
vector=vector@entry=0x7ffce7a537d0, req=req@entry=0x7f3d1c55bb60 <xcb_req>)
at
/var/tmp/portage/x11-libs/libxcb-1.11-r1/work/libxcb-1.11/src/xcb_out.c:187
#1 0x00007f3d1c54f29f in xcb_list_properties_unchecked (c=<optimized out>,
window=<optimized out>) at xproto.c:2650
#2 0x00007f3d1a18285d in Plasma::EffectWatcher::isEffectActive
(this=this@entry=0x7f3d1f1be290)
at
/var/tmp/portage/kde-frameworks/plasma-5.7.0/work/plasma-framework-5.7.0/src/plasma/private/effectwatcher.cpp:91
#3 0x00007f3d1a1829a9 in isEffectActive (this=0x7f3d1f1be290) at
/var/tmp/portage/kde-frameworks/plasma-5.7.0/work/plasma-framework-5.7.0/src/plasma/private/effectwatcher.cpp:79
#4 Plasma::EffectWatcher::nativeEventFilter (this=0x7f3d1f1be290,
eventType=..., message=0x7f3d04005160, result=<optimized out>)
at
/var/tmp/portage/kde-frameworks/plasma-5.7.0/work/plasma-framework-5.7.0/src/plasma/private/effectwatcher.cpp:76
#5 0x00007f3d1ca3aa8a in QAbstractEventDispatcher::filterNativeEvent
(this=<optimized out>, eventType=..., message=message@entry=0x7f3d04005160,
result=result@entry=0x7ffce7a538e8)
at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qabstracteventdispatcher.cpp:460
#6 0x00007f3d0c6d6951 in QXcbConnection::handleXcbEvent
(this=this@entry=0x7f3d1f13c5a0, event=event@entry=0x7f3d04005160)
at
/var/tmp/portage/dev-qt/qtgui-5.5.9999/work/qtgui-5.5.9999/src/plugins/platforms/xcb/qxcbconnection.cpp:971
#7 0x00007f3d0c6d89b3 in QXcbConnection::processXcbEvents
(this=0x7f3d1f13c5a0) at
/var/tmp/portage/dev-qt/qtgui-5.5.9999/work/qtgui-5.5.9999/src/plugins/platforms/xcb/qxcbconnection.cpp:1376
#8 0x00007f3d1ca77c86 in QObject::event (this=0x7f3d1f13c5a0, e=<optimized
out>) at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qobject.cpp:1246
#9 0x00007f3d1d391ddc in QApplicationPrivate::notify_helper
(this=this@entry=0x7f3d1f135000, receiver=receiver@entry=0x7f3d1f13c5a0,
e=e@entry=0x7f3d040051d0)
at
/var/tmp/portage/dev-qt/qtwidgets-5.5.9999/work/qtwidgets-5.5.9999/src/widgets/kernel/qapplication.cpp:3716
#10 0x00007f3d1d3977ba in QApplication::notify (this=0x7ffce7a540b0,
receiver=0x7f3d1f13c5a0, e=0x7f3d040051d0)
at
/var/tmp/portage/dev-qt/qtwidgets-5.5.9999/work/qtwidgets-5.5.9999/src/widgets/kernel/qapplication.cpp:3499
#11 0x00007f3d1ca3e9cd in QCoreApplication::notifyInternal
(this=0x7ffce7a540b0, receiver=0x7f3d1f13c5a0, event=event@entry=0x7f3d040051d0)
at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qcoreapplication.cpp:963
#12 0x00007f3d1ca4142b in sendEvent (event=0x7f3d040051d0, receiver=<optimized
out>) at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qcoreapplication.h:228
#13 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0,
event_type=event_type@entry=0, data=0x7f3d1f126340)
at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qcoreapplication.cpp:1580
#14 0x00007f3d1caa343a in QEventDispatcherUNIX::processEvents
(this=0x7f3d1f15ea90, flags=flags@entry=...)
at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qeventdispatcher_unix.cpp:579
#15 0x00007f3d0c7160a0 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...)
at
/var/tmp/portage/dev-qt/qtgui-5.5.9999/work/qtgui-5.5.9999/src/platformsupport/eventdispatchers/qunixeventdispatcher.cpp:62
#16 0x00007f3d1ca3be4b in QEventLoop::exec (this=this@entry=0x7ffce7a53fa0,
flags=..., flags@entry=...)
at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qeventloop.cpp:204
#17 0x00007f3d1ca4521e in QCoreApplication::exec () at
/var/tmp/portage/dev-qt/qtcore-5.5.9999/work/qtcore-5.5.9999/src/corelib/kernel/qcoreapplication.cpp:1216
#18 0x00007f3d1cd90a0a in QGuiApplication::exec () at
/var/tmp/portage/dev-qt/qtgui-5.5.9999/work/qtgui-5.5.9999/src/gui/kernel/qguiapplication.cpp:1522
#19 0x00007f3d1d38db8b in QApplication::exec () at
/var/tmp/portage/dev-qt/qtwidgets-5.5.9999/work/qtwidgets-5.5.9999/src/widgets/kernel/qapplication.cpp:2976
#20 0x00007f3d1e5c4bcf in kdemain (argc=2, argv=0x7ffce7a54208) at
/var/tmp/portage/kde-plasma/kwin-5.2.9999/work/kwin-5.2.9999/main_x11.cpp:294
#21 0x00007f3d1e23f9f5 in __libc_start_main (main=0x7f3d1e9eb9a0 <main(int,
char**)>, argc=2, argv=0x7ffce7a54208, init=<optimized out>, fini=<optimized
out>, rtld_fini=<optimized out>,
stack_end=0x7ffce7a541f8) at libc-start.c:292
#22 0x00007f3d1e9eba09 in _start ()
[1] https://codereview.qt-project.org/108329/
[2] https://git.reviewboard.kde.org/r/122908/
Change-Id: Id7fcb1c2138d604b2e6291dda4db9855548de2ec
---
M src/plasma/private/effectwatcher.cpp
1 file changed, 3 insertions(+), 0 deletions(-)
git pull ssh://gerrit.vesnicky.cesnet.cz:29418/plasma-framework
refs/changes/15/415/1
diff --git a/src/plasma/private/effectwatcher.cpp
b/src/plasma/private/effectwatcher.cpp
index 25b48e2..179e626 100644
--- a/src/plasma/private/effectwatcher.cpp
+++ b/src/plasma/private/effectwatcher.cpp
@@ -88,6 +88,9 @@
return false;
}
xcb_connection_t *c = QX11Info::connection();
+ if (!c) {
+ return false;
+ }
xcb_list_properties_cookie_t propsCookie =
xcb_list_properties_unchecked(c, QX11Info::appRootWindow());
QScopedPointer<xcb_list_properties_reply_t, QScopedPointerPodDeleter>
props(xcb_list_properties_reply(c, propsCookie, nullptr));
if (props.isNull()) {
--
To view, visit https://gerrit.vesnicky.cesnet.cz/r/415
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Gerrit-MessageType: newchange
Gerrit-Change-Id: Id7fcb1c2138d604b2e6291dda4db9855548de2ec
Gerrit-PatchSet: 1
Gerrit-Project: plasma-framework
Gerrit-Branch: master
Gerrit-Owner: Jan Kundrát <j...@kde.org>
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