LP:680408 - invalid fastbin entry (free) detected in close_thread_tables

The following INSERT + DELETE RQG workload causes the following crash:

2010-11-23T09:07:39 #3 0x000000307b6329c5 in raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64

1. 2010-11-23T09:07:39 #4 0x000000307b6341a5 in abort () at abort.c:92
2. 2010-11-23T09:07:39 #5 0x000000307b66fe2b in __libc_message (do_abort=2, fmt=0x307b743a78 "*** glibc detected *** %s: %s: 0x%s ***\n")
3. 2010-11-23T09:07:39 at ../sysdeps/unix/sysv/linux/libc_fatal.c:186
4. 2010-11-23T09:07:39 #6 0x000000307b675746 in malloc_printerr (action=3, str=0x307b741ba8 "invalid fastbin entry (free)", ptr=<value optimized out>) at malloc.c:6280
5. 2010-11-23T09:07:39 #7 0x000000000064e081 in close_thread_tables (thd=0x2458c60) at sql_base.cc:1350
6. 2010-11-23T09:07:39 #8 0x000000000061537c in dispatch_command (command=<value optimized out>, thd=0x2458c60, packet=0x245a570 "\001", packet_length=335563336)
7. 2010-11-23T09:07:39 at sql_parse.cc:1701
8. 2010-11-23T09:07:39 #9 0x00000000006168f1 in do_command (thd=0x2458c60) at sql_parse.cc:895
9. 2010-11-23T09:07:39 #10 0x000000000060823f in handle_one_connection (arg=0x2458c60) at sql_connect.cc:1138
10. 2010-11-23T09:07:39 #11 0x000000307ba07761 in start_thread (arg=0x7f5d65738710) at pthread_create.c:301
11. 2010-11-23T09:07:39 #12 0x000000307b6e150d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

It is repeatable in about 50% of the test runs within 10 minutes from the start of the test.