Hi there,
On Sat, 19 Dec 2009 12:06:41 +0000, Tomeu Vizoso <to...@sugarlabs.org>
wrote:
> On Sat, Dec 19, 2009 at 07:00, John Gilmore <g...@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
I hope it helps,
http://oficina.paraguayeduca.org/~crodas/valgrind-debug.txt
cheers,
>
> Regards,
>
> Tomeu
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