Conditional jump or move depends on uninitialised value(s) at GraphicsDisplayX11.cpp:1677

[Marco Biscaro]

Relevant valgrind log:

==30807== Conditional jump or move depends on uninitialised value(s)
==30807== at 0x16DAF827: nux::GraphicsDisplay::ProcessXEvent(_XEvent, bool) (GraphicsDisplayX11.cpp:1677)
==30807== by 0x16DAFC2B: nux::GraphicsDisplay::ProcessForeignX11Event(_XEvent*, nux::Event*) (GraphicsDisplayX11.cpp:1352)
==30807== by 0x186C9DBB: nux::WindowThread::ProcessForeignEvent(_XEvent*, void*) (WindowThread.cpp:1270)
==30807== by 0x1811818F: unity::UnityScreen::handleEvent(_XEvent*) (unityshell.cpp:1179)
==30807== by 0x457BE7: CompScreen::handleEvent(_XEvent*) (in /usr/bin/compiz)
==30807== by 0x431969: PrivateScreen::processEvents() (in /usr/bin/compiz)
==30807== by 0x45EAC0: CompEventSource::callback() (in /usr/bin/compiz)
==30807== by 0x623A9DE: Glib::Source::dispatch_vfunc(_GSource*, int (*)(void*), void*) (in /usr/lib/libglibmm-2.4.so.1.3.0)
==30807== by 0x66A6A5C: g_main_context_dispatch (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3000.0)
==30807== by 0x66A7257: ??? (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3000.0)
==30807== by 0x66A7791: g_main_loop_run (in /lib/x86_64-linux-gnu/libglib-2.0.so.0.3000.0)
==30807== by 0x42E855: CompScreen::eventLoop() (in /usr/bin/compiz)

Running nux revision 538.

[Bilal Akhtar (bilalakhtar)]

These mostly seem X-related (and possibly driver-related as well). Which GPU are you using?

[Marco Biscaro (marcobiscaro2112)]

From lspci -vv

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller])
        Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Device 2013
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 43
        Region 0: Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f080 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee0500c Data: 4171
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915
        Kernel modules: i915

[Sven Baars (sbte)]

This is probably because m_WMDeleteWindow is used uninitialized. I'm not sure what it should be set to by default though.

[Omer Akram (om26er)]

Marco, Thanks for the report. Is that still an issue in Ubuntu 12.04 ?

[Daniel van Vugt (vanvugt)]

I think the details in this bug are out of date. The line of code moved, but was fixed as bug 983321.