Bug#1008862: trace from Unstable
I've attached valgrind output from starting kwin on Unstable, it got this
error just from the initialisation phase.
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==8576== Memcheck, a memory error detector
==8576== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==8576== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==8576== Command: kwin_x11
==8576==
Warning: Setting a new default format with a different version or profile after the global shared context is created may cause issues with context sharing.
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 180, resource id: 23068691, major code: 20 (GetProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 181, resource id: 23068691, major code: 20 (GetProperty), minor code: 0
==8576== Syscall param writev(vector[...]) points to uninitialised byte(s)
==8576== at 0x76274AD: __writev (writev.c:26)
==8576== by 0x76274AD: writev (writev.c:24)
==8576== by 0x5BFCFB8: write_vec (xcb_conn.c:277)
==8576== by 0x5BFCFB8: _xcb_conn_wait (xcb_conn.c:523)
==8576== by 0x5BFD790: _xcb_out_send (xcb_out.c:464)
==8576== by 0x5BFD790: _xcb_out_flush_to (xcb_out.c:488)
==8576== by 0x5BFD790: _xcb_out_flush_to (xcb_out.c:477)
==8576== by 0x5BFEE14: wait_for_reply (xcb_in.c:508)
==8576== by 0x5BFEE90: xcb_wait_for_reply (xcb_in.c:546)
==8576== by 0x5C00382: xcb_get_extension_data (xcb_ext.c:99)
==8576== by 0x4B496AE: KWin::Xcb::Extensions::init() (xcbutils.cpp:402)
==8576== by 0x4B4B426: KWin::Xcb::Extensions::self() (xcbutils.cpp:344)
==8576== by 0x1296386E: void KWin::X11StandalonePlatform::doUpdateOutputs<KWin::Xcb::RandR::ScreenResources>() (x11_platform.cpp:470)
==8576== by 0x1295E5B8: KWin::X11StandalonePlatform::initOutputs() (x11_platform.cpp:448)
==8576== by 0x1295E64A: KWin::X11StandalonePlatform::initialize() (x11_platform.cpp:140)
==8576== by 0x13C9E1: operator() (main_x11.cpp:233)
==8576== by 0x13C9E1: call (qobjectdefs_impl.h:146)
==8576== by 0x13C9E1: call<QtPrivate::List<>, void> (qobjectdefs_impl.h:256)
==8576== by 0x13C9E1: QtPrivate::QFunctorSlotObject<KWin::ApplicationX11::performStartup()::{lambda()#2}, 0, QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (qobjectdefs_impl.h:443)
==8576== Address 0xc1cdd4a is 4,538 bytes inside a block of size 21,168 alloc'd
==8576== at 0x48445EF: calloc (in /usr/libexec/valgrind/vgpreload_memcheck-amd64-linux.so)
==8576== by 0x5BFC980: xcb_connect_to_fd (xcb_conn.c:346)
==8576== by 0x5C0116A: xcb_connect_to_display_with_auth_info (xcb_util.c:532)
==8576== by 0x7F6B031: _XConnectXCB (in /usr/lib/x86_64-linux-gnu/libX11.so.6.4.0)
==8576== by 0x7F5B6F4: XOpenDisplay (in /usr/lib/x86_64-linux-gnu/libX11.so.6.4.0)
==8576== by 0xC8C0FA6: QXcbBasicConnection::QXcbBasicConnection(char const*) (qxcbconnection_basic.cpp:114)
==8576== by 0xC8994A1: QXcbConnection::QXcbConnection(QXcbNativeInterface*, bool, unsigned int, char const*) (qxcbconnection.cpp:91)
==8576== by 0xC89CCF7: QXcbIntegration::QXcbIntegration(QStringList const&, int&, char**) (qxcbintegration.cpp:197)
==8576== by 0x485340E: create (qxcbmain.cpp:56)
==8576== by 0x485340E: QXcbIntegrationPlugin::create(QString const&, QStringList const&, int&, char**) (qxcbmain.cpp:53)
==8576== by 0x5D4F36E: init_platform (qguiapplication.cpp:1223)
==8576== by 0x5D4F36E: QGuiApplicationPrivate::createPlatformIntegration() (qguiapplication.cpp:1481)
==8576== by 0x5D5097F: QGuiApplicationPrivate::createEventDispatcher() (qguiapplication.cpp:1498)
==8576== by 0x65A15F6: QCoreApplicationPrivate::init() (qcoreapplication.cpp:834)
==8576== Uninitialised value was created by a stack allocation
==8576== at 0x6A4652C: KSelectionOwner::Private::gotTimestamp() (kselectionowner.cpp:209)
==8576==
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3115, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3116, resource id: 23068759, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3117, resource id: 23068759, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3118, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3119, resource id: 23068761, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3120, resource id: 23068761, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3121, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3122, resource id: 23068763, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3123, resource id: 23068763, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3124, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3125, resource id: 23068765, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3126, resource id: 23068765, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3127, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3128, resource id: 23068767, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3129, resource id: 23068767, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3130, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3131, resource id: 23068769, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3132, resource id: 23068769, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3133, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3134, resource id: 23068771, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3135, resource id: 23068771, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 2 (BadValue), sequence: 3136, resource id: 0, major code: 53 (CreatePixmap), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3137, resource id: 23068773, major code: 55 (CreateGC), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3138, resource id: 23068773, major code: 72 (PutImage), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 3309, resource id: 23068756, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3310, resource id: 23068756, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 3313, resource id: 23068756, major code: 3 (GetWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable), sequence: 3314, resource id: 23068756, major code: 14 (GetGeometry), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7182, resource id: 104857602, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7185, resource id: 104857602, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7186, resource id: 104857602, major code: 18 (ChangeProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7187, resource id: 104857602, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7188, resource id: 104857602, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7189, resource id: 104857602, major code: 19 (DeleteProperty), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7190, resource id: 104857602, major code: 7 (ReparentWindow), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7191, resource id: 104857602, major code: 6 (ChangeSaveSet), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7192, resource id: 104857602, major code: 2 (ChangeWindowAttributes), minor code: 0
qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence: 7193, resource id: 104857602, major code: 10 (UnmapWindow), minor code: 0
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