Loaded symbols for /usr/lib/asterisk/modules/format_ilbc.so
#0  0x00af02e3 in strlen () from /lib/tls/libc.so.6
(gdb) bt
#0  0x00af02e3 in strlen () from /lib/tls/libc.so.6
#1  0x00151a63 in channel_spy (chan=0xb710ea88, spyee=0xa1daa10, volfactor=0xb7274be0, fd=0, 
    flags=0xb7274c44) at app_chanspy.c:256
#2  0x00152550 in common_exec (chan=0xb710ea88, flags=0xb7274c44, volfactor=0, fd=0, 
    mygroup=0x0, spec=0xb7274c00 "SIP/6317", exten=0x0, context=0x0) at app_chanspy.c:532
#3  0x00152bfa in chanspy_exec (chan=0xb710ea88, data=0xb7279030) at app_chanspy.c:627
#4  0x080c91d1 in pbx_extension_helper (c=0xb710ea88, con=Variable "con" is not available.
) at pbx.c:532
#5  0x080ca51f in __ast_pbx_run (c=0xb710ea88) at pbx.c:2288
#6  0x080cc43e in pbx_thread (data=0xb710ea88) at pbx.c:2601
#7  0x080f9495 in dummy_start (data=0x1534d5) at utils.c:545
#8  0x00609371 in start_thread () from /lib/tls/libpthread.so.0
#9  0x00b4effe in clone () from /lib/tls/libc.so.6
(gdb) bt full
#0  0x00af02e3 in strlen () from /lib/tls/libc.so.6
No symbol table info available.
#1  0x00151a63 in channel_spy (chan=0xb710ea88, spyee=0xa1daa10, volfactor=0xb7274be0, fd=0, 
    flags=0xb7274c44) at app_chanspy.c:256
        __old = 0x140 ""
        __len = Variable "__len" is not available.