(gdb) bt
#0  0x006287a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0x0066d7a5 in raise () from /lib/tls/libc.so.6
#2  0x0066f209 in abort () from /lib/tls/libc.so.6
#3  0x006a171a in __libc_message () from /lib/tls/libc.so.6
#4  0x006a81c0 in _int_free () from /lib/tls/libc.so.6
#5  0x006a833a in free () from /lib/tls/libc.so.6
#6  0x080c0024 in __ast_free_region (ptr=0x933fa94, file=0x5c0a13 "app_macro.c", lineno=301, func=0x5c1095 "macro_exec") at astmm.c:172
#7  0x080c0320 in __ast_free (ptr=0x933fa94, file=0x5c0a13 "app_macro.c", lineno=301, func=0x5c1095 "macro_exec") at astmm.c:198
#8  0x005c0141 in macro_exec (chan=0xb7919ee4, data=0xb77e9750) at app_macro.c:301
#9  0x08084953 in pbx_exec (c=0xb7919ee4, app=0x931c684, data=0xb77e9750, newstack=1) at pbx.c:574
#10 0x08087dce in pbx_extension_helper (c=0xb7919ee4, con=0x0, context=0xb791a034 "macro-record-enable", exten=0xb791a128 "s", priority=7,
    label=0x0, callerid=0x9302c54 "466", action=1) at pbx.c:1717
#11 0x080890f4 in ast_spawn_extension (c=0xb7919ee4, context=0xb791a034 "macro-record-enable", exten=0xb791a128 "s", priority=7,
    callerid=0x9302c54 "466") at pbx.c:2250
#12 0x005bfb9b in macro_exec (chan=0xb7919ee4, data=0xb77f0070) at app_macro.c:228
#13 0x08084953 in pbx_exec (c=0xb7919ee4, app=0x931c684, data=0xb77f0070, newstack=1) at pbx.c:574
#14 0x08087dce in pbx_extension_helper (c=0xb7919ee4, con=0x0, context=0xb791a034 "macro-record-enable", exten=0xb791a128 "s", priority=1,
    label=0x0, callerid=0x9302c54 "466", action=1) at pbx.c:1717
#15 0x080890f4 in ast_spawn_extension (c=0xb7919ee4, context=0xb791a034 "macro-record-enable", exten=0xb791a128 "s", priority=1,
    callerid=0x9302c54 "466") at pbx.c:2250
#16 0x080895a5 in __ast_pbx_run (c=0xb7919ee4) at pbx.c:2316
#17 0x0808a2f1 in pbx_thread (data=0xb7919ee4) at pbx.c:2537
#18 0x0080d371 in start_thread () from /lib/tls/libpthread.so.0
#19 0x0070dffe in clone () from /lib/tls/libc.so.6