Bug 407373

Summary:	kwin crashes on active window screenshot (X11)
Product:	[Plasma] kwin	Reporter:	Mikel Pérez <io>
Component:	general	Assignee:	Vlad Zahorodnii <vlad.zahorodnii>
Status:	RESOLVED DUPLICATE
Severity:	crash	CC:	me, nate
Priority:	NOR
Version First Reported In:	5.15.4
Target Milestone:	---
Platform:	Fedora RPMs
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Mikel Pérez 2019-05-10 01:40:28 UTC

SUMMARY
when I take a screenshot of the active window (with the shortcut), kwin crashes. also, the screenshot comes out as if it were a screenshot of the whole screen.


STEPS TO REPRODUCE
1. take a screenshot of a window
2. crash

OBSERVED RESULT
crash, I have to re-run it

EXPECTED RESULT
no crash and proper screenshot

SOFTWARE/OS VERSIONS
Fedora 30
KDE Plasma Version: 5.15.4
KDE Frameworks Version: 5.57.0
Qt Version: 5.12.1

Comment 1 Mikel Pérez 2019-05-10 02:00:57 UTC

it takes a proper window-shot and doesn't crash with GTK apps tho (!!)

Comment 2 Vlad Zahorodnii 2019-05-10 07:21:40 UTC

Hmm, I thought it was fixed. Will look into it.

Comment 3 Vlad Zahorodnii 2019-05-16 10:55:07 UTC

Backtrace of the crash:

(lldb) bt
* thread #1, name = 'kwin_x11', stop reason = signal SIGABRT
  * frame #0: 0x00007fcff0b1d82f libc.so.6`__GI_raise + 271
    frame #1: 0x00007fcff0b08672 libc.so.6`__GI_abort + 293
    frame #2: 0x00007fcff10408b2 libQt5Core.so.5`::qt_message_fatal((null)=<unavailable>, context=<unavailable>, message=<unavailable>) at qlogging.cpp:1904:15
    frame #3: 0x00007fcff10414fd libQt5Core.so.5`QMessageLogger::fatal(this=<unavailable>, msg=<unavailable>) const at qlogging.cpp:888:21
    frame #4: 0x00007fcff1039ca6 libQt5Core.so.5`qt_assert(assertion=<unavailable>, file=<unavailable>, line=<unavailable>) at qglobal.cpp:3254:46
    frame #5: 0x00007fcfdbf1ba8c KWinSceneOpenGL.so`KWin::DecorationShadowTextureCache::~DecorationShadowTextureCache(this=0x00007fcfdbf41e60) at scene_opengl.cpp:2035:5
    frame #6: 0x00007fcff0b1ff2c libc.so.6`__run_exit_handlers + 316
    frame #7: 0x00007fcff0b2005e libc.so.6`__GI_exit + 30
    frame #8: 0x00007fcfeaf55550 libQt5XcbQpa.so.5`QXcbConnection::processXcbEvents(this=0x00005555d4b8dcd0, flags=(i = 36)) at qxcbconnection.cpp:1003:13
    frame #9: 0x00007fcfeaf878e0 libQt5XcbQpa.so.5`QXcbUnixEventDispatcher::processEvents(this=0x00005555d4be6ee0, flags=(i = 36)) at qxcbeventdispatcher.cpp:61:35
    frame #10: 0x00007fcff121dea5 libQt5Core.so.5`QEventLoop::processEvents(this=<unavailable>, flags=<unavailable>) at qeventloop.cpp:138:64
    frame #11: 0x00007fcff121e2fd libQt5Core.so.5`QEventLoop::exec(this=0x00007ffe4e928790, flags=(i = 0)) at qeventloop.cpp:225:22
    frame #12: 0x00007fcff12285fa libQt5Core.so.5`QCoreApplication::exec() at qcoreapplication.cpp:1368:36
    frame #13: 0x00007fcff160cc02 libQt5Gui.so.5`QGuiApplication::exec() at qguiapplication.cpp:1788:34
    frame #14: 0x00007fcff1c4ffb9 libQt5Widgets.so.5`QApplication::exec() at qapplication.cpp:2896:33
    frame #15: 0x00007fcff521ff51 libkdeinit5_kwin_x11.so`::kdemain(argc=2, argv=0x00007ffe4e928a28) at main_x11.cpp:470:18
    frame #16: 0x00005555d347b17b kwin_x11`main(argc=2, argv=0x00007ffe4e928a28) at kwin_x11_dummy.cpp:3:50
    frame #17: 0x00007fcff0b09ce3 libc.so.6`__libc_start_main + 243
    frame #18: 0x00005555d347b06e kwin_x11`_start + 46

Comment 4 Vlad Zahorodnii 2019-05-16 11:02:44 UTC

I think that screenshots we're sending using x pixmaps are just too big.

Comment 5 Vlad Zahorodnii 2019-05-16 11:03:13 UTC

@Mikel Do you have a 4K screen?

Comment 6 Vlad Zahorodnii 2019-05-16 11:14:09 UTC

Hmm, I think the only way to fix this is to send screenshots over pipe.

Comment 7 Vlad Zahorodnii 2019-05-16 12:05:03 UTC


*** This bug has been marked as a duplicate of bug 388182 ***