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Re: XShmQueryExtension, valgrind and a "still reachable" block.

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On Fri, 16 Mar 2012 14:50:22 -0400
Adam Jackson <ajax@xxxxxxxxxx> wrote:

> On 3/16/12 12:19 PM, Antonio Ospite wrote:
> 
> > ==27577== 24 bytes in 1 blocks are still reachable in loss record 1 of 1
> > ==27577==    at 0x402894D: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
> > ==27577==    by 0x4A30AFD: XextCreateExtension (in /usr/lib/x86_64-linux-gnu/libXext.so.6.4.0)
> > ==27577==    by 0x4A305A4: ??? (in /usr/lib/x86_64-linux-gnu/libXext.so.6.4.0)
> > ==27577==    by 0x4A3091C: ??? (in /usr/lib/x86_64-linux-gnu/libXext.so.6.4.0)
> > ==27577==    by 0x4A30D31: XextAddDisplay (in /usr/lib/x86_64-linux-gnu/libXext.so.6.4.0)
> > ==27577==    by 0x4A2B5B8: XShmQueryExtension (in /usr/lib/x86_64-linux-gnu/libXext.so.6.4.0)
> > ==27577==    by 0x4006D5: main (in /home/ao2/WIP/am7xxx-play/tests/XShmQueryExtension_test)
> > ...
> >
> > Maybe this is intended and not an actual bug, but I wanted to ask
> > here for confirmation.
> > So, is this message OK or a symptom of an actual bug?
> 
> It's a bug if you expect your program to survive disconnecting from the 
> X server, but most people don't expect that to be a thing.
>

Right, still inexperienced users could waste a couple of minutes
figuring out the noise in the valgrind output.

> That said, I'm unable to reproduce this on Fedora 16 (libX11 1.4.3 and 
> libXext 1.2.0).  What OS are you seeing this on, and what versions of 
> those packages does it have?

Debian Unstable: libx11-6 1.4.99.1 and libxext6 1.3.0

Thanks,
   Antonio

-- 
Antonio Ospite
http://ao2.it

A: Because it messes up the order in which people normally read text.
   See http://en.wikipedia.org/wiki/Posting_style
Q: Why is top-posting such a bad thing?

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