https://bugs.kde.org/show_bug.cgi?id=359664
Bernhard Übelacker <bernha...@mailbox.org> changed:
What |Removed |Added
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CC| |bernha...@mailbox.org
--- Comment #3 from Bernhard Übelacker <bernha...@mailbox.org> ---
I received a similar crash in Debian Stretch with plasma-workspace and
plasma-workspace-dbgsym in version 4:5.8.6-2.
At the time it crashed I assume just kradio4 tray icon was running
additionally to the default ones. (Saw just later the crash in dmesg.)
# coredumpctl gdb
Core was generated by `/usr/bin/xembedsniproxy'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 SNIProxy::getImageNonComposite (this=this@entry=0x5636e8f4b460) at
./xembed-sni-proxy/sniproxy.cpp:273
273 QImage naiveConversion = QImage(image->data, image->width,
image->height, QImage::Format_ARGB32);
[Current thread is 1 (Thread 0x7f15c8ff25c0 (LWP 1559))]
(gdb) bt
#0 SNIProxy::getImageNonComposite (this=this@entry=0x5636e8f4b460) at
./xembed-sni-proxy/sniproxy.cpp:273
#1 0x00005636e7509507 in SNIProxy::update (this=0x5636e8f4b460) at
./xembed-sni-proxy/sniproxy.cpp:214
#2 0x00005636e7506583 in FdoSelectionManager::nativeEventFilter
(this=0x7fff86289810, eventType=..., message=<optimized out>, result=<optimized
out>) at ./xembed-sni-proxy/fdoselectionmanager.cpp:154
#3 0x00007f15c7b0ab0f in
QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#4 0x00007f15beaa2334 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*)
() from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#5 0x00007f15beaa3015 in QXcbConnection::processXcbEvents() () from
/usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
#6 0x00007f15c7b3a499 in QObject::event(QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#7 0x00007f15c7b0d87a in QCoreApplication::notify(QObject*, QEvent*) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#8 0x00007f15c7b0d9e0 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#9 0x00007f15c7b1016d in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#10 0x00007f15c7b61c43 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#11 0x00007f15c3b757f7 in g_main_context_dispatch () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#12 0x00007f15c3b75a60 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f15c3b75b0c in g_main_context_iteration () from
/lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f15c7b6204f in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x00007f15c7b0b9ca in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#16 0x00007f15c7b1413c in QCoreApplication::exec() () from
/usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#17 0x00005636e7503972 in main (argc=<optimized out>, argv=<optimized out>) at
./xembed-sni-proxy/main.cpp:68
(gdb) list SNIProxy::getImageNonComposite
...
270 xcb_image_t *image = xcb_image_get(c, m_windowId, 0, 0,
geom->width, geom->height, 0xFFFFFFFF, XCB_IMAGE_FORMAT_Z_PIXMAP);
271
272 // Don't hook up cleanup yet, we may use a different QImage after
all
273 QImage naiveConversion = QImage(image->data, image->width,
image->height, QImage::Format_ARGB32);
(gdb) print/x image
$1 = <optimized out>
(gdb) disassemble SNIProxy::getImageNonComposite
...
0x00005636e750922a <+106>: mov %rax,%r12
0x00005636e750922d <+109>: callq 0x5636e7502bf0 <xcb_image_get@plt>
=> 0x00005636e7509232 <+114>: movzwl 0x2(%rax),%ecx
0x00005636e7509236 <+118>: movzwl (%rax),%edx
(gdb) print/x $ecx
$3 = 0xc6f61ffa
(gdb) print/x $rax
$4 = 0x0
As far as I found the callq instruction is supposed to write the
return value into the rax register.
So I assume function xcb_image_get returned a NULL pointer.
Shouldn't there be a "if (image)" before
the QImage construction?
Are some more informations needed from the core dump?
Kind regards,
Bernhard
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