(gdb) bt
#0  0x006a8916 in _int_malloc () from /lib/tls/libc.so.6
#1  0x006aa401 in malloc () from /lib/tls/libc.so.6
#2  0x00484467 in q931_getcall (pri=0x8e2e808, cr=6408) at q931.c:2117
#3  0x0048699f in q931_receive (pri=0x8e2e808, h=0xb7d1dba4, len=69) at q931.c:2994
#4  0x0047edb1 in q921_handle_iframe (pri=0x8e2e808, i=0xb7d1dba0, len=73) at q921.c:491
#5  0x0047f578 in __q921_receive_qualified (pri=0x8e2e808, h=0xb7d1dba0, len=73) at q921.c:720
#6  0x0047fe34 in __q921_receive (pri=0x8e2e808, h=0xb7d1dba0, len=73) at q921.c:926
#7  0x0047fe6d in q921_receive (pri=0x8e2e808, h=0xb7d1dba0, len=75) at q921.c:934
#8  0x0047c7d6 in pri_check_event (pri=0x8e2e808) at pri.c:353
#9  0x004486ad in pri_dchannel (vpri=0x4600b8) at chan_zap.c:8359
#10 0x0080d371 in start_thread () from /lib/tls/libpthread.so.0
#11 0x0070dffe in clone () from /lib/tls/libc.so.6