Simon Gornall <[email protected]> writes:
> I'm trying to run my application under valgrind, and it's failing
> when I initialise the OpenGL context... I get the debug log:
To clarify -- are you saying that it can initialize the context fine
when run standalone, and only fails through valgrind?
(I'm going to assume `yes'... sorry.)
> ==50304== ... (snipped)
> ==50304== Process terminating with default action of signal 11 (SIGSEGV)
> ==50304== Access not within mapped region at address 0x187E7108
> ==50304== at 0x1466316: memcpy (mc_replace_strmem.c:482)
> ==50304== by 0x16050DFA: gldGetTextureLevel (in /System/Library/
> Extensions/GeForce8xxxGLDriver.bundle/Contents/MacOS/
> GeForce8xxxGLDriver)
[snip]
> I've been playing with suppressions because the above are OS-internal
> issues, and eventually (after failing to stop the SIGSEGV being sent),
> my 'valgrind' file looks like:
>
> -----8<-----8<----- Snip here -----8<-----8<-----
> {
> GL context creation
> Memcheck:Addr16
> fun:memcpy
> ...
> fun:CGLCreateContext
> }
[snip]
> I started off with more-specific suppressions, but even with the
> above, the application is aborted every time I run.
This sentence implies you are slightly confused about the semantics of
a suppression file. These files are merely to suppress *reporting* of
errors; the existance or not of any given suppression should not change
the behavior of a program. It will certainly change what valgrind
prints out, but not what's going on under the hood.
Since you're using nvidia's driver, I'd ask you to re-run using the
command line option `--smc-check=all'. I am not as familiar with
nvidia's Mac driver, but on Linux the driver utilizes self modifying
code, which causes me to see a lot of errors similar to the one you
describe above. Note that even with SMC checking, I still see a lot of
nvidia-based errors, so don't expect this will be a 100% solution.
If that fails, I suggest linking your program against Mesa, probably
mangled Mesa for logistical reasons. That will valgrind much more
`nicely'. This:
http://visitusers.org/index.php?title=Mangled_Mesa
might help you, if you need to go that route.
Cheers,
-tom
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