[RHEL5.6] automount crash in glibc 'free' called from Quest shared library, indicating "double free"

We having issue with autofs, It stops mounting the nfs mount under /home.  This is the 5th occurrence in a row of dumping the automount core.

#0  0x00002b4c81dd0265 in raise (sig=) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1  0x00002b4c81dd1d10 in abort () at abort.c:88
#2  0x00002b4c81e0a99b in __libc_message (do_abort=2, fmt=0x2b4c81ec2ae8 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:170
#3  0x00002b4c81e1245f in malloc_printerr (av=0x2aaab4000020, p=0x2aaab40260e0, have_lock=0) at malloc.c:6205
#4  _int_free (av=0x2aaab4000020, p=0x2aaab40260e0, have_lock=0) at malloc.c:4738
#5  0x00002b4c81e128bb in __libc_free (mem=) at malloc.c:3670
#6  0x00002aaaabe985f1 in ?? ()
#7  0x00002aaab40286c0 in ?? ()
#8  0x00002b4c9fc8c4f0 in ?? ()
#9  0x00000000abed3c90 in ?? ()
#10 0x0000001500000000 in ?? ()
#11 0x00002b4c9fc8c4f0 in ?? ()
#12 0x0000000000000000 in ?? ()
(gdb) frame 4
#4  _int_free (av=0x2aaab4000020, p=0x2aaab40260e0, have_lock=0) at malloc.c:4738
4738           malloc_printerr (check_action, errstr, chunk2mem(p));
(gdb) p errstr
$7 = 0x2b4c81ec2b90 "double free or corruption (fasttop)"
(gdb) info sharedlibrary 
warning: Can't read pathname for load map: Input/output error.
From                To                  Syms Read   Shared Object Library
0x00002b4c80fa21f0  0x00002b4c80fad258  Yes (*)     /lib64/libpthread.so.0
0x00002b4c811b8e10  0x00002b4c811b9a08  Yes (*)     /lib64/libdl.so.2
0x00002b4c813e7210  0x00002b4c814b7408  Yes (*)     /usr/lib64/libxml2.so.2
0x00002b4c816fbfd0  0x00002b4c81706ac8  Yes (*)     /usr/lib64/libz.so.1
0x00002b4c81911e60  0x00002b4c81951e38  Yes (*)     /lib64/libm.so.6
0x00002b4c81b92e50  0x00002b4c81b9c018  Yes (*)     /lib64/libgcc_s.so.1
0x00002b4c81dbd780  0x00002b4c81eaa798  Yes (*)     /lib64/libc.so.6
0x00002b4e29780a70  0x00002b4e297967ce  Yes (*)     /lib64/ld-linux-x86-64.so.2
0x00002aaaaaab01d0  0x00002aaaaaabbbb8  Yes (*)     /usr/lib64/autofs/lookup_file.so
0x00002aaaaacef0a0  0x00002aaaaacfb6a8  Yes (*)     /lib64/libnsl.so.1
0x00002aaaaaf09d20  0x00002aaaaaf1b118  Yes (*)     /usr/lib64/autofs/parse_sun.so
0x00002aaaab138780  0x00002aaaab13d2c8  Yes (*)     /usr/lib64/autofs/mount_nfs.so
0x00002aaaab3400b0  0x00002aaaab341058  Yes (*)     /usr/lib64/autofs/mount_bind.so
0x00002aaaab547f40  0x00002aaaab553b78  Yes (*)     /usr/lib64/autofs/lookup_hosts.so
0x00002aaaab7721c0  0x00002aaaab77d178  Yes (*)     /usr/lib64/autofs/lookup_yp.so
0x00002aaaab997fe0  0x00002aaaab99e268  Yes (*)     /lib64/libnss_files.so.2
                                        No          /lib64/libnss_vas3.so.2
                                        No          /opt/quest/lib64/libvas.so.4
0x00002aaaac0412a0  0x00002aaaac04c2d8  Yes (*)     /lib64/libresolv.so.2
0x00002aaaac2539f0  0x00002aaaac259918  Yes (*)     /lib64/libcrypt.so.1
0x00002aaaac48bfe0  0x00002aaaac48e828  Yes (*)     /lib64/libnss_dns.so.2
(*): Shared library is missing debugging information.