D20234: Also unset QT_SCALE_FACTOR

Vlad Zagorodniy <[email protected]>
Newsgroups gmane.comp.kde.devel.kwin
Message-ID <[email protected]> 
zzag added a comment.


  Why does KWin hang when that environment variable is set?
  
  Relevant backtrace:
  
    (gdb) bt
    #0  0x00007f525bebc444 in _int_malloc () at /usr/lib/libc.so.6
    #1  0x00007f525bebdada in malloc () at /usr/lib/libc.so.6
    #2  0x00007f525bec149f in strdup () at /usr/lib/libc.so.6
    #3  0x00007f5256363c26 in FcValueSave () at /usr/lib/libfontconfig.so.1
    #4  0x00007f525634fe0c in  () at /usr/lib/libfontconfig.so.1
    #5  0x00007f52563507b2 in  () at /usr/lib/libfontconfig.so.1
    #6  0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #7  0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #8  0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #9  0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #10 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #11 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #12 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #13 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #14 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #15 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #16 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #17 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #18 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #19 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #20 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #21 0x00007f52563507ce in  () at /usr/lib/libfontconfig.so.1
    #22 0x00007f5256350a1f in FcConfigSubstituteWithPat () at /usr/lib/libfontconfig.so.1
    #23 0x00007f5256471eb1 in  () at /usr/lib/libQt5XcbQpa.so.5
    #24 0x00007f525647285b in  () at /usr/lib/libQt5XcbQpa.so.5
    #25 0x00007f525ca5293c in  () at /usr/lib/libQt5Gui.so.5
    #26 0x00007f525ca53332 in QFontDatabase::findFont(QFontDef const&, int) () at /usr/lib/libQt5Gui.so.5
    #27 0x00007f525ca3bf2d in QFontEngineMulti::loadEngine(int) () at /usr/lib/libQt5Gui.so.5
    #28 0x00007f525ca3cb8f in QFontEngineMulti::ensureEngineAt(int) () at /usr/lib/libQt5Gui.so.5
    #29 0x00007f525ca3cd54 in QFontEngineMulti::glyphIndex(unsigned int) const () at /usr/lib/libQt5Gui.so.5
    #30 0x00007f525ca47a9c in QFontMetrics::boundingRect(QChar) const () at /usr/lib/libQt5Gui.so.5
    #31 0x00007f525e739880 in KDecoration2::DecorationSettings::<lambda()>::operator()(void) const (__closure=0x7ffe6f13d6c8)
        at /home/vlad/Workspace/KDE/src/kde/workspace/kdecoration/src/decorationsettings.cpp:34
    #32 0x00007f525e739a85 in KDecoration2::DecorationSettings::DecorationSettings(KDecoration2::DecorationBridge*, QObject*)
        (this=0x558f29c08540, bridge=0x558f29cc6220, parent=0x0) at /home/vlad/Workspace/KDE/src/kde/workspace/kdecoration/src/decorationsettings.cpp:48
    #33 0x00007f525ff93d90 in QSharedPointer<KDecoration2::DecorationSettings>::create<KWin::Decoration::DecorationBridge*>(KWin::Decoration::DecorationBridge*&&)
        (arguments#0=@0x7ffe6f13d778: 0x558f29cc6220) at /usr/include/qt/QtCore/qsharedpointer_impl.h:445
    #34 0x00007f525ff91a3c in KWin::Decoration::DecorationBridge::init() (this=0x558f29cc6220)
        at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/decorations/decorationbridge.cpp:123
    #35 0x00007f525fd99aa6 in KWin::Workspace::Workspace(QString const&) (this=0x558f29c7aea0, sessionKey=...)
        at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/workspace.cpp:185
    #36 0x00007f525fe75ac0 in KWin::Application::createWorkspace() (this=0x7ffe6f13e100) at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/main.cpp:281
    #37 0x00007f52601a470d in KWin::ApplicationX11::<lambda()>::<lambda()>::operator()(void) const (__closure=0x558f29cbc210)
        at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/main_x11.cpp:253
    #38 0x00007f52601a67ee in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KWin::ApplicationX11::performStartup()::<lambda()>::<lambda()> >::call(KWin::ApplicationX11::<lambda()>::<lambda()> &, void **) (f=..., arg=0x7ffe6f13da50) at /usr/include/qt/QtCore/qobjectdefs_impl.h:146
    #39 0x00007f52601a66e0 in QtPrivate::Functor<KWin::ApplicationX11::performStartup()::<lambda()>::<lambda()>, 0>::call<QtPrivate::List<>, void>(KWin::ApplicationX11::<lambda()>::<lambda()> &, void *, void **) (f=..., arg=0x7ffe6f13da50) at /usr/include/qt/QtCore/qobjectdefs_impl.h:256
    #40 0x00007f52601a6556 in QtPrivate::QFunctorSlotObject<KWin::ApplicationX11::performStartup()::<lambda()>::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1, this_=0x558f29cbc200, r=0x7ffe6f13e100, a=0x7ffe6f13da50, ret=0x0)
        at /usr/include/qt/QtCore/qobjectdefs_impl.h:439
    #41 0x00007f525c5cf980 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
    #42 0x00007f525fd7e987 in KWin::Platform::screensQueried() (this=0x558f29bf3a80) at kwin_autogen/EWIEGA46WW/moc_platform.cpp:300
    #43 0x00007f5254b3f61c in KWin::X11StandalonePlatform::init() (this=0x558f29bf3a80)
        at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/plugins/platforms/x11/standalone/x11_platform.cpp:104
    #44 0x00007f52601a495c in KWin::ApplicationX11::<lambda()>::operator()(void) const (__closure=0x558f29bf0b90)
        at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/main_x11.cpp:266
    #45 0x00007f52601a6920 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, KWin::ApplicationX11::performStartup()::<lambda()> >::call(KWin::ApplicationX11::<lambda()> &, void **) (f=..., arg=0x7ffe6f13dcc0) at /usr/include/qt/QtCore/qobjectdefs_impl.h:146
    #46 0x00007f52601a689a in QtPrivate::Functor<KWin::ApplicationX11::performStartup()::<lambda()>, 0>::call<QtPrivate::List<>, void>(KWin::ApplicationX11::<lambda()> &, void *, void **) (f=..., arg=0x7ffe6f13dcc0) at /usr/include/qt/QtCore/qobjectdefs_impl.h:256
    #47 0x00007f52601a678e in QtPrivate::QFunctorSlotObject<KWin::ApplicationX11::performStartup()::<lambda()>, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase *, QObject *, void **, bool *) (which=1, this_=0x558f29bf0b80, r=0x558f29bfbdd0, a=0x7ffe6f13dcc0, ret=0x0) at /usr/include/qt/QtCore/qobjectdefs_impl.h:439
    #48 0x00007f525c5cf980 in QMetaObject::activate(QObject*, int, int, void**) () at /usr/lib/libQt5Core.so.5
    #49 0x00007f525d4a501f in KSelectionOwner::claimedOwnership() (this=0x558f29bfbdd0) at src/KF5WindowSystem_autogen/HBARIMPYTU/moc_kselectionowner.cpp:159
    #50 0x00007f525d4b8345 in KSelectionOwner::Private::claimSucceeded() (this=0x558f29bfbdf0)
        at /home/vlad/Workspace/KDE/src/frameworks/kwindowsystem/src/platforms/xcb/kselectionowner.cpp:207
    #51 0x00007f525d4b8475 in KSelectionOwner::Private::gotTimestamp() (this=0x558f29bfbdf0)
        at /home/vlad/Workspace/KDE/src/frameworks/kwindowsystem/src/platforms/xcb/kselectionowner.cpp:241
    #52 0x00007f525d4b8ab2 in KSelectionOwner::filterEvent(void*) (this=0x558f29bfbdd0, ev_P=0x7f5250001710)
        at /home/vlad/Workspace/KDE/src/frameworks/kwindowsystem/src/platforms/xcb/kselectionowner.cpp:425
    #53 0x00007f525d4b9475 in KSelectionOwner::Private::nativeEventFilter(QByteArray const&, void*, long*)
        (this=0x558f29bfbdf0, eventType=..., message=0x7f5250001710, result=0x7ffe6f13de88)
        at /home/vlad/Workspace/KDE/src/frameworks/kwindowsystem/src/platforms/xcb/kselectionowner.cpp:118
    #54 0x00007f525c5a28bf in QAbstractEventDispatcher::filterNativeEvent(QByteArray const&, void*, long*) () at /usr/lib/libQt5Core.so.5
    #55 0x00007f52563caab2 in QXcbConnection::handleXcbEvent(xcb_generic_event_t*) () at /usr/lib/libQt5XcbQpa.so.5
    #56 0x00007f52563cb84e in QXcbConnection::processXcbEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5XcbQpa.so.5
    #57 0x00007f52563f6d6e in  () at /usr/lib/libQt5XcbQpa.so.5
    #58 0x00007f525c5a3a8c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /usr/lib/libQt5Core.so.5
    #59 0x00007f525c5abde6 in QCoreApplication::exec() () at /usr/lib/libQt5Core.so.5
    #60 0x00007f52601a5f35 in kdemain(int, char**) (argc=2, argv=0x7ffe6f13e2a8) at /home/vlad/Workspace/KDE/src/kde/workspace/kwin/main_x11.cpp:469
    #61 0x0000558f28eb817b in main(int, char**) (argc=2, argv=0x7ffe6f13e2a8) at kwin_x11_dummy.cpp:3
  
  (so for far it looks like an issue in the qpa, I might be completely wrong)

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D20234

To: davidedmundson
Cc: zzag, kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart
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