possible progress on XO-1 camera issues

[Tomeu Vizoso]

On Sat, Dec 19, 2009 at 07:00, John Gilmore <gnu at toad.com> wrote:
>> #10 0xb67fae59 in gst_xvimagesink_xvimage_put (xvimagesink=0x8364160)
>>     at xvimagesink.c:864
>>         src = {x = 134867456, y = 140758336, w = -1259457208, h = 1}
>>         dst = {x = 137730309, y = 3, w = 0, h = 137691184}
>>         result = {x = 0, y = 0, w = 322, h = 241}
>>         draw_border = 322
>>         __PRETTY_FUNCTION__ = "gst_xvimagesink_xvimage_put"
>>
>> The src.w value is in the same range as the Xlib function addresses;
>> -1259457208 is 0x4B11CAB8 and as can be seen from the call frame #9
>> the XSync function is at 0x4b0eccf7.  The other values seem
>> irrational.  This may be evidence that the stack has been corrupted
>> somewhere else, or the values not initialised.
>
> Just to rule out going too far down a blind alley...
>
> Try adding a printf of these values to the code there, rather than or
> in addition to using GDB.  GDB may not be 100% reliable when accessing
> variables from optimized code.  (I used to maintain GDB, and I worked
> very hard to make it never lie to you, but that precept hasn't always
> been followed in the intervening decade, and optimizations have also
> gotten a lot more complicated.)
>
> Or try compiling that code without -O and see if that changes either
> its behavior, or what the debugger reports.

At this point is when I would run totem in valgrind, I can help
interpreting the output if it's not clear.

# yum install valgrind
$ valgrind totem

Regards,

Tomeu

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