(gdb) bt

#0  0x00007fae11ef70c3 in base_ilist::append (this=0x7fae12dff7e0 <threads>, a=0xb17a50) at /home/raatikka/src/bazaar/shared/maria/5.5/libmysqld/../sql/sql_list.h:685

#1  0x00007fae11ef82eb in I_List<THD>::append (this=0x7fae12dff7e0 <threads>, a=0xb17a50) at /home/raatikka/src/bazaar/shared/maria/5.5/libmysqld/../sql/sql_list.h:761

#2  0x00007fae11ef5432 in create_embedded_thd (client_flag=41477) at /home/raatikka/src/bazaar/shared/maria/5.5/libmysqld/lib_sql.cc:687

#3  0x00007fadfb33c628 in get_or_create_thd_for_parsing (mysql=0xb12d00, query_str=0xb0dd40 "select * from mysql.foo where id=7") at ./query_classifier.cc:194

#4  0x00007fadfb33c47b in skygw_query_classifier_get_type (query=0xb0dd40 "select * from mysql.foo where id=7", client_flags=0) at ./query_classifier.cc:128

#5  0x00007fadfb54262c in routeQuery (instance=0xaf86e0, router_session=0x7fadf0015630, queue=0xb0e670) at readwritesplit.c:501

#6  0x00007fae100e8b4e in gw_read_client_event (dcb=0x7fadf0015b50) at mysql_client.c:745

#7  0x000000000040eb62 in poll_waitevents (arg=0x0) at poll.c:460

#8  0x00000000004076c6 in main (argc=2, argv=0x7fffb5558328) at gateway.c:583

(gdb) p threads

$2 = {<base_ilist> = {first = 0x0, last = {_vptr.ilink = 0x7fae12bf9530 <vtable for ilink+16>, prev = 0x7fadf0016440, next = 0x0}}, <No data fields>}