Re: [ecasound] Bug report: strange crash

On Tue, Mar 13, 2012 at 12:50:15AM -0400, S. Massy wrote:
> Hello,
>
> A feature recently introduced in nama (single effect bypass) has brought
> up some strange behaviour in ecasound. When the effect being bypassed is
> removed, or around that event, ecasound segfaults. Here is the
> information I have collected thus far.
With Joel Roth's help, I got nama to create a similar set-up but with
rtnull instead of jack IO in order to get some noise out of the way.
Attached, you will find a full log (-ddd) of what led up to the crash.
Here is the backtrace:

#0 SAMPLE_BUFFER::multiply_by (this=0x730034322074, factor=1)
    at samplebuffer.cpp:358
#1 0x00000000004ba106 in CHAIN::process (this=0x7c9fb0) at eca-chain.cpp:748
#2 0x00000000005562ec in ECA_ENGINE::process_chains (this=0x7e5ee0)
    at eca-engine.cpp:1647
#3 0x000000000055cf8e in ECA_ENGINE::engine_iteration (this=0x7e5ee0)
    at eca-engine.cpp:654
#4 0x000000000055e7fd in ECA_ENGINE_DEFAULT_DRIVER::exec (this=0x113b920,
    engine=<value optimized out>, csetup=<value optimized out>)
    at eca-engine.cpp:114
#5 0x000000000055d4b0 in ECA_ENGINE::exec (this=0x7e5ee0,
    batch_mode=<value optimized out>) at eca-engine.cpp:289
#6 0x00000000004d2218 in ECA_CONTROL::run_engine (this=0x7d4be0)
    at eca-control-base.cpp:364
#7 0x00000000004d2328 in ECA_CONTROL::start_normal_thread (
    ptr=<value optimized out>) at eca-control-base.cpp:68
#8 0x00007ffff5f6d8ca in start_thread () from /lib/libpthread.so.0
#9 0x00007ffff552886d in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Line 358 of samplebuffer.cpp is:
358 for(channel_size_t n = 0; n < channel_count_rep; n++) {

Incidentally, even with debug enabled, some values seem to get optimised
out, such as the final value of n in the line above.

Hope this is of some further help.

Cheers,
S.M.

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