rhythmbox dumped core mid-song, the UI was hidden at the time.

Core was generated by `rhythmbox'.
Program terminated with signal 11, Segmentation fault.
#0  evaluate_conjunctive_subquery (dbtree=0xa6a020, query=0x10fc1b0, 
    base=<value optimized out>, max=2, entry=0xd283c0) at rhythmdb-tree.c:1361
1361            for (current = words; *current != NULL; current++) {
(gdb) info locals
relative_time = 13790416
current_time = {tv_sec = 16, tv_usec = 255271699347}
db = <value optimized out>
i = 0
__PRETTY_FUNCTION__ = "evaluate_conjunctive_subquery"
(gdb) where
#0  evaluate_conjunctive_subquery (dbtree=0xa6a020, query=0x10fc1b0, 
    base=<value optimized out>, max=2, entry=0xd283c0) at rhythmdb-tree.c:1361
#1  0x0000000000496d22 in do_conjunction (entry=0xd283c0, 
    unused=<value optimized out>, data=0xd26cd0) at rhythmdb-tree.c:1515
#2  0x0000003b6f62054e in IA__g_hash_table_foreach (hash_table=0xcd7b00, 
    func=0x496cf0 <do_conjunction>, user_data=0xd26cd0) at ghash.c:662
#3  0x0000003b6f62054e in IA__g_hash_table_foreach (hash_table=0xcd7ac0, 
    func=0x495f40 <conjunctive_query_songs>, user_data=0xd26cd0) at ghash.c:662
#4  0x0000003b6f62054e in IA__g_hash_table_foreach (hash_table=0xcd7a80, 
    func=0x495f60 <conjunctive_query_albums>, user_data=0xd26cd0) at ghash.c:662
#5  0x0000003b6f62054e in IA__g_hash_table_foreach (hash_table=0xa48540, 
    func=0x496060 <conjunctive_query_artists>, user_data=0xd26cd0) at ghash.c:662
#6  0x0000000000496401 in rhythmdb_tree_do_full_query (adb=<value optimized out>, 
    query=<value optimized out>, results=<value optimized out>, cancel=0x10fbb70)
    at rhythmdb-tree.c:1706
#7  0x0000000000487b31 in rhythmdb_query_internal (data=0x10fbb50) at
rhythmdb.c:2928
#8  0x0000000000487d5d in query_thread_main (data=0x10fbb50) at rhythmdb.c:2951
#9  0x0000003b6f648f24 in g_thread_create_proxy (data=0x112e850) at gthread.c:553
#10 0x000000332ae06305 in start_thread () from /lib64/libpthread.so.0
#11 0x000000332a2cd62d in clone () from /lib64/libc.so.6
#12 0x0000000000000000 in ?? ()
(gdb) 

all other threads than this one are blocked in poll/pthread_cond_wait; can
attach full backtrace if necessary.