This is interesting. There were some problems in fftlib.c that caused
crashes on 64 bit platforms, reported almost a year ago, but those were
believed to be fixed for a long time. Could you also compile with
noDebug=0 customCCFLAGS="-O0" ? The line numbers do not seem to agree
with the sources exactly, and gdb is often not reliable when run on
optimized code.
By the way, did you ever have success using vco2 with a 64 bit build
on x86_64 ? If yes, it is somewhat odd that it no longer works now.

On Saturday 08 April 2006 04:53, Iain Duncan wrote:

> Thanks Steven and Istvan. Here are the results, with csound built for
> noDebug=0
> 
> ...
> 
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 16384 (LWP 22046)]
> 0x0000000000440ed5 in ibfstages (ioptr=0x7055c0, M=9, Utbl=0x800000002,
> Ustride=16, NDiffU=64, StageCnt=16) at OOps/fftlib.c:1829
> 1829    OOps/fftlib.c: No such file or directory.
>         in OOps/fftlib.c
> (gdb) bt
> #0  0x0000000000440ed5 in ibfstages (ioptr=0x7055c0, M=9,
> Utbl=0x800000002, Ustride=16, NDiffU=64, StageCnt=16)
>     at OOps/fftlib.c:1829
> #1  0x0000000000441c5a in ifftrecurs (ioptr=0x6fd590, M=9,
> Utbl=0x7055c0, Ustride=0, NDiffU=12, StageCnt=1024)
>     at OOps/fftlib.c:2127
> #2  0x000000000044482e in csoundInverseRealFFT (csound=0x5b10a0,
> buf=0x6fd590, FFTsize=3) at OOps/fftlib.c:3104
> #3  0x00002aaaabbd3c87 in vco2_tables_create (csound=0x5b10a0,
> waveform=101, base_ftable=32767, tp=0x82000023d0)
>     at Opcodes/oscbnk.c:1520
> #4  0x00002aaaabbd46f4 in vco2set (csound=0x5b10a0, p=0x61ad20) at
> Opcodes/oscbnk.c:1917
> #5  0x0000000000416c09 in insert (csound=0x5b10a0, insno=5991240,
> newevtp=<incomplete type>) at Engine/insert.c:189
> #6  0x000000000041a28a in process_score_event (p=0x5b10a0,
> evt=<incomplete type>, rtEvt=0) at Engine/musmon.c:634
> #7  0x000000000041a85d in sensevents (csound=0x41) at Engine/musmon.c:790
> #8  0x000000000040452d in csoundPerform (csound=0x5b6c50) at
> Top/csound.c:1130
> #9  0x0000000000403e8d in main (argc=0, argv=0x200000000) at
> frontends/csound/csound_main.c:109
> (gdb)


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