yes, I am running JACK.
everything is okay, but when I try to change num of channles from the pd GUI, it segfault then.
[paum@bookes ~]$ gdb --args pdextended -nrt -channels 4
GNU gdb (GDB) 7.5.1
Copyright (C) 2012 Free Software Foundation, Inc.
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Reading symbols from /usr/bin/pdextended...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/pdextended -nrt -channels 4
warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[New Thread 0x7ffff7fba700 (LWP 2249)]
[New Thread 0x7ffff7f39700 (LWP 2250)]
[New Thread 0x7ffff7eb8700 (LWP 2251)]
[New Thread 0x7ffff53d6700 (LWP 2252)]
[Thread 0x7ffff7eb8700 (LWP 2251) exited]
[Thread 0x7ffff7f39700 (LWP 2250) exited]
[Thread 0x7ffff7fba700 (LWP 2249) exited]
[New Thread 0x7ffff7fba700 (LWP 2253)]
[New Thread 0x7ffff7f39700 (LWP 2254)]
[New Thread 0x7ffff7eb8700 (LWP 2255)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7eb8700 (LWP 2255)]
0x00000000004685f5 in ?? ()
(gdb) bt
#0 0x00000000004685f5 in ?? ()
#1 0x00007ffff6f83cac in ?? () from /usr/lib/libjack.so.0
#2 0x00007ffff6f83bb4 in ?? () from /usr/lib/libjack.so.0
#3 0x00007ffff6f81aab in ?? () from /usr/lib/libjack.so.0
#4 0x00007ffff6fa0ebc in ?? () from /usr/lib/libjack.so.0
#5 0x00007ffff78c8dd2 in start_thread () from /usr/lib/libpthread.so.0
#6 0x00007ffff6ca3ced in clone () from /usr/lib/libc.so.6
(gdb)