(gdb) bt
#0  0x420748e0 in _int_free () from /lib/tls/libc.so.6
#1  0x42073908 in free () from /lib/tls/libc.so.6
#2  0x408ad5f4 in create_addr (r=0x422c76e8, opeer=0x102add78 <Address 0x102add78 out of bounds>) at chan_sip.c:1035
#3  0x408afb5d in sip_send_mwi_to_peer (peer=0x8156e98) at chan_sip.c:7604
#4  0x408aa1b2 in do_monitor (data=0x0) at chan_sip.c:7643
#5  0x4002b484 in start_thread () from /lib/tls/libpthread.so.0
(gdb)