[Bug 68987] intel-virtual-overlay: only background image and mouse cursor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68987

--- Comment #2 from Severin Strobl <fd at severin-strobl.de> ---
Created attachment 85273
  --> https://bugs.freedesktop.org/attachment.cgi?id=85273&action=edit
intel-virtual-output debug output

Right, I recompiled intel-virtual-output with debugging support. It seems some
damaged regions are detected, however to me it seems like the positions are
invalid. Some kind of overflow? Unfortunately the log file grew quite large
rather quickly, nevertheless I attached it.

During testing I encountered a problem with intel-virtual-output itself: Once I
killed the process and tried to start intel-virtual-output again, it fails:

display_open((null))
:0.0: singleton registered? 1
:0.0: pinging singleton
:0.0: send command '4567P'
*** buffer overflow detected ***: intel-virtual-output terminated
======= Backtrace: =========
/lib64/libc.so.6(__fortify_fail+0x37)[0x7fd3457b68c7]
/lib64/libc.so.6(+0xff6c0)[0x7fd3457b46c0]
/lib64/libc.so.6(+0xfea39)[0x7fd3457b3a39]
/lib64/libc.so.6(_IO_default_xsputn+0x85)[0x7fd34572e015]
/lib64/libc.so.6(_IO_vfprintf+0x1ae1)[0x7fd3456fc4c1]
/lib64/libc.so.6(__vsprintf_chk+0x9d)[0x7fd3457b3add]
/lib64/libc.so.6(__sprintf_chk+0x83)[0x7fd3457b3a23]
intel-virtual-output[0x406ab3]
intel-virtual-output[0x4031ee]
/lib64/libc.so.6(__libc_start_main+0xfd)[0x7fd3456d74bd]
intel-virtual-output[0x405ce9]

Not sure whether restarting intel-virtual-output should work at all. In this
case I could try to recompile it with debugging symbols.

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