(gdb) bt
#0  0x00bd57a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x00c1a7a5 in raise () from /lib/tls/libc.so.6
#2  0x00c1c209 in abort () from /lib/tls/libc.so.6
#3  0x00c4e71a in __libc_message () from /lib/tls/libc.so.6
#4  0x00c54fbf in _int_free () from /lib/tls/libc.so.6
#5  0x00c5533a in free () from /lib/tls/libc.so.6
#6  0x006029fe in vm_execmain (chan=0xb5655938, data=0x5e3b30) at app_voicemail.c:5573
#7  0x080918dd in pbx_extension_helper (c=0xb5655938, con=Variable "con" is not available.
) at pbx.c:574
#8  0x08091e8c in ast_spawn_extension (c=0x0, context=0x6 "", exten=0x6 "", priority=6, 
    callerid=0x6 "") at pbx.c:2250
#9  0x0084adfb in macro_exec (chan=0xb5655938, data=0x5eb0a0) at app_macro.c:283
#10 0x080918dd in pbx_extension_helper (c=0xb5655938, con=Variable "con" is not available.
) at pbx.c:574
#11 0x08092ba6 in __ast_pbx_run (c=0xb5655938) at pbx.c:2250
#12 0x0809473c in pbx_thread (data=0x0) at pbx.c:2537
#13 0x00dcf371 in start_thread () from /lib/tls/libpthread.so.0
#14 0x00cbaffe in clone () from /lib/tls/libc.so.6
(gdb) bt full
#0  0x00bd57a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
No symbol table info available.
#1  0x00c1a7a5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x00c1c209 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x00c4e71a in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x00c54fbf in _int_free () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x00c5533a in free () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x006029fe in vm_execmain (chan=0xb5655938, data=0x5e3b30) at app_voicemail.c:5573
        uc = Variable "uc" is not available.