possible progress on XO-1 camera issues

[Tomeu Vizoso]

Hmm, it's a bit hard to read with so many details, can you run it
again without -v --leak-check=full --show-reachable=yes ? Those are
useful when looking for memory leaks.

I would expect that valgrind would complain when the uninitialized
values get read.

Thanks,

Tomeu

On Mon, Dec 21, 2009 at 20:13, crodas <crodas at paraguayeduca.org> wrote:
> Hi there,
> On Sat, 19 Dec 2009 12:06:41 +0000, Tomeu Vizoso <tomeu at sugarlabs.org>
> wrote:
>> 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
> I hope it helps,
>
> http://oficina.paraguayeduca.org/~crodas/valgrind-debug.txt
>
> cheers,
>
>>
>> Regards,
>>
>> Tomeu
>



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