[PD] rvbap crashes

[Mathieu Bouchard]

Le 2011-10-05 à 14:59:00, Iain Mott a écrit :

> I'm having problems already cited elsewhere with rvbap - whereby it
> crashes with a "Signal 6" when adjusting the azimuth and having first
> configured the external with a 2D speaker array (eg. with a message:
> "define_loudspeakers 2 -45 45 0 180").
> I've tried this with pdextended on linux (i'm using ubuntu 11.04) and
> also by compiling the external with this source:
> http://pure-data.svn.sourceforge.net/viewvc/pure-data/trunk/externals/vbap/
> Same thing.
> Does anyone have any suggestions?

When you compile the external from source, you have the possibility to 
enable debug. I edited Makefile (with an uppercase) to change that, but 
debugging info was already enabled (-g). I changed the optimisation flags 
though (-O1 instead of -O6 -fomit-frame-pointer).

btw, the use of those flags is misleading, as -O6 is completely the same 
as -O3, and -fomit-frame-pointer (which hinders debugging) is already 
included in -O2 and -O3 (in -O1 it depends, see manpage).

-funroll-loops, however, has no impact on debuggability...

Then if you run :

   valgrind pd vbap-help.pd

and click around a bit, you get :

==10071== Invalid read of size 4
==10071==    at 0x4F42667: additive_vbap (vbap.c:419)
==10071==    by 0x4F43527: vbap_bang (vbap.c:526)
==10071==    by 0x4F45217: choose_ls_tuplets (define_loudspeakers.c:757)
==10071==    by 0x4F45664: vbap_def_ls (define_loudspeakers.c:62)
==10071==    by 0x80C7498: pd_typedmess (m_class.c:716)
==10071==    by 0x3FFFFFFF: ???
==10071==  Address 0x43886bc is 4 bytes before a block of size 16 alloc'd
==10071==    at 0x4024F12: calloc (vg_replace_malloc.c:467)
==10071==    by 0x80CB2BC: getbytes (m_memory.c:24)
==10071==    by 0x4F45217: choose_ls_tuplets (define_loudspeakers.c:757)
==10071==    by 0x4F45664: vbap_def_ls (define_loudspeakers.c:62)
==10071==    by 0x80C7498: pd_typedmess (m_class.c:716)
==10071==    by 0x3FFFFFFF: ???

which is a lot more informative when it can report function names, rather 
than just the library names...

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| Mathieu BOUCHARD ----- téléphone : +1.514.383.3801 ----- Montréal, QC