(gdb) bt
#0  0x00007f2bd06f31b0 in strlen () from /lib/libc.so.6
#1  0x0000000000467e1e in ast_frdup (f=0x7f2bd10cdbfe) at frame.c:500
#2  0x000000000043ef9b in __ast_queue_frame (chan=0x1144650, fin=0x7f2bb56425c0, head=0, after=0x0) at channel.c:921
#3  0x000000000043f456 in ast_queue_frame (chan=0x1144650, fin=0x7f2bb56425c0) at channel.c:991
#4  0x00007f2bc5248d66 in local_queue_frame (p=0x11438b0, isoutbound=0, f=0x7f2bb56425c0, us=0x1143cc0, us_locked=1) at chan_local.c:211
#5  0x00007f2bc52492d7 in local_write (ast=0x1143cc0, f=0x7f2bb56425c0) at chan_local.c:330
#6  0x0000000000445e16 in ast_write (chan=0x1143cc0, fr=0x7f2bb56425c0) at channel.c:3004
#7  0x00007f2bbeff5a37 in mp3_exec (chan=0x1143cc0, data=0x7f2bb56449c0) at app_mp3.c:209
#8  0x0000000000483248 in pbx_exec (c=0x1143cc0, app=0x10db510, data=0x7f2bb56449c0) at pbx.c:537
#9  0x000000000048687c in pbx_extension_helper (c=0x1143cc0, con=0x0, context=0x1143f10 "default", exten=0x1143f60 "999", priority=1, label=0x0, callerid=0x11342f0 "999", action=E_SPAWN) at pbx.c:1864
#10 0x0000000000487a4c in ast_spawn_extension (c=0x1143cc0, context=0x1143f10 "default", exten=0x1143f60 "999", priority=1, callerid=0x11342f0 "999") at pbx.c:2314
#11 0x0000000000487ed1 in __ast_pbx_run (c=0x1143cc0) at pbx.c:2404
#12 0x0000000000488ef7 in pbx_thread (data=0x1143cc0) at pbx.c:2630
#13 0x00000000004ca9dc in dummy_start (data=0x1133d80) at utils.c:856
#14 0x00007f2bd10cbfd7 in start_thread () from /lib/libpthread.so.0
#15 0x00007f2bd07471fd in clone () from /lib/libc.so.6
#16 0x0000000000000000 in ?? ()
(gdb)