Description of problem:
[dmalcolm@cassandra ~]$ gdb sqlite3 
GNU gdb Red Hat Linux (6.5-16.el5rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db
library "/lib/libthread_db.so.1".

(gdb) run
Starting program: /usr/bin/sqlite3 
[Thread debugging using libthread_db enabled]
[New Thread -1208596800 (LWP 18243)]
SQLite version 3.3.6
Enter ".help" for instructions
sqlite> create table foo ( bar varchar(40) );
sqlite> select * from foo;
sqlite> explain select * from foo;

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208596800 (LWP 18243)]
0x42807353 in strlen () from /lib/libc.so.6
(gdb) bt
#0  0x42807353 in strlen () from /lib/libc.so.6
#1  0x42a917e7 in sqlite3VdbeList (p=0x85e5c38) at ./src/vdbeaux.c:659
#2  0x42a8ed9f in sqlite3_step (pStmt=0x85e5c38) at ./src/vdbeapi.c:219
#3  0x42a97655 in sqlite3_exec (db=0x85e2058, zSql=0x85e5f90 "explain select *
from foo;", 
    xCallback=0x8049fc0 <callback>, pArg=0xbfca962c, pzErrMsg=0xbfca95d8) at
./src/legacy.c:78
#4  0x0804cae1 in process_input (p=0xbfca962c, in=0x0) at ./src/shell.c:1495
#5  0x0804d32d in main (argc=1, argv=0xbfcaabe4) at ./src/shell.c:1786
#6  0x427b0dec in __libc_start_main () from /lib/libc.so.6
#7  0x08049171 in _start ()
(gdb) up
#1  0x42a917e7 in sqlite3VdbeList (p=0x85e5c38) at ./src/vdbeaux.c:659
659         pMem->n = strlen(pMem->z);
(gdb) p *pMem
$1 = {i = 0, r = 0, z = 0x8000 <Address 0x8000 out of bounds>, n = 0, flags = 162, 
  type = 0 '\0', enc = 0 '\0', xDel = 0, zShort = '\0' <repeats 31 times>}


Version-Release number of selected component (if applicable):
sqlite-3.3.6-2

How reproducible:
100%