(gdb) bt
#0  0x004ce402 in __kernel_vsyscall ()
#1  0x007017d5 in raise () from /lib/tls/libc.so.6
#2  0x00703149 in abort () from /lib/tls/libc.so.6
#3  0x0073540a in __libc_message () from /lib/tls/libc.so.6
#4  0x0073c51c in _int_malloc () from /lib/tls/libc.so.6
#5  0x0073dcf6 in calloc () from /lib/tls/libc.so.6
#6  0x080591ed in ast_frdup (f=0x1) at frame.c:377
#7  0x08061e49 in queue_frame_to_spies (chan=0x94624e0, f=0x93eda60, dir=SPY_WRITE) at channel.c:1205
#8  0x080652ce in ast_write (chan=0x94624e0, fr=0x93eda60) at channel.c:2277
#9  0x08068b77 in ast_channel_bridge (c0=0x94624e0, c1=0x94802c8, config=0xb781c700, fo=0xb781bba8,
    rc=0xb781bbac) at channel.c:3362
#10 0x00f46d15 in ast_bridge_call (chan=0x94624e0, peer=0x94802c8, config=0xb781c700)
    at res_features.c:1329
#11 0x004bbe22 in dial_exec_full (chan=0x94624e0, data=Variable "data" is not available.
) at app_dial.c:1607
#12 0x004be7bd in dial_exec (chan=0x0, data=0x6) at app_dial.c:1649
#13 0x080910cd in pbx_extension_helper (c=0x94624e0, con=Variable "con" is not available.
) at pbx.c:553
#14 0x08092396 in __ast_pbx_run (c=0x94624e0) at pbx.c:2230
#15 0x080932f0 in ast_pbx_run (c=0x94624e0) at pbx.c:2556
#16 0x08093cf5 in ast_pbx_outgoing_exten (type=0x945deec "AGENT", format=64, data=0x945dfec,
    timeout=45000, context=0x945e3ec "auto_dial", exten=0x945e2ec "01324840909", priority=1,
    reason=0xb7823438, sync=2, cid_num=0x945e4f0 "01324840909", cid_name=0x945e5f0 "->Martin Feeney",
    vars=0x940e568, account=0x945e6f0 "", channel=0x0) at pbx.c:5024
#17 0x00adf208 in attempt_thread (data=0x945ddd8) at pbx_spool.c:266
#18 0x009e2341 in start_thread () from /lib/tls/libpthread.so.0
#19 0x007a16fe in clone () from /lib/tls/libc.so.6

(gdb) bt full
#0  0x004ce402 in __kernel_vsyscall ()
No symbol table info available.
#1  0x007017d5 in raise () from /lib/tls/libc.so.6
No symbol table info available.
#2  0x00703149 in abort () from /lib/tls/libc.so.6
No symbol table info available.
#3  0x0073540a in __libc_message () from /lib/tls/libc.so.6
No symbol table info available.
#4  0x0073c51c in _int_malloc () from /lib/tls/libc.so.6
No symbol table info available.
#5  0x0073dcf6 in calloc () from /lib/tls/libc.so.6
No symbol table info available.
#6  0x080591ed in ast_frdup (f=0x1) at frame.c:377
        len = 8392692
        srclen = 8398880
        buf = Variable "buf" is not available.
(gdb)