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(ITS#4180) slapd (back-sql) hangs/segfaults on SASL bind

Full_Name: Nels Lindquist
Version: 2.3.11
OS: Linux (CentOS 3.6)
Submission from: (NULL) (

CentOS 3.6 (RHEL rebuild)
OpenLDAP 2.3.11 (built from source)
Cyrus SASL 2.1.20
PostgreSQL 8.1.0
unixODBC 2.2.8

Using back-sql with PostgreSQL, slapd hangs indefinitely (when running in the
background) or segfaults (when run with -d 1) whenever a SASLv2 bind is
attempted.  Simple bind works fine.

Here are the last few lines from the slapd debug output:

<==slap_sasl2dn: Converted SASL name to cn=nels lindquist,o=maei,c=ca
slap_sasl_getdn: dn:id converted to cn=nels lindquist,o=maei,c=ca
SASL Canonicalize [conn=7]: slapAuthcDN="cn=nels lindquist,o=maei,c=ca"
SASL Canonicalize [conn=7]: authzid="nels"
SASL proxy authorize [conn=7]: authcid="nels" authzid="nels"

I also managed to get a backtrace from gdb:

[Switching to Thread -1228420176 (LWP 17259)]
0x0018977b in strlen () from /lib/tls/libc.so.6
(gdb) bt
#0  0x0018977b in strlen () from /lib/tls/libc.so.6
#1  0x00157611 in vfprintf () from /lib/tls/libc.so.6
#2  0x00178d14 in vsnprintf () from /lib/tls/libc.so.6
#3  0x080f4e58 in lutil_debug (debug=7, level=1191210597, 
fmt=0x810ce5c "==>slap_sasl_authorized: can %s become %s?\n") at     
#4  0x0808fb77 in slap_sasl_authorized (op=0x9777138,     
authcDN=0xb6c7c678, authzDN=0xb6c7c670) at saslauthz.c:2074  
#5  0x08093889 in slap_sasl_authorize (sconn=0x9776370,     
context=0xb7580a18, requested_user=0x9776c80 "nels", rlen=4, 
auth_identity=0x9776d81 "nels", alen=4, def_realm=0x0, urlen=0, 
props=0x97775f8) at sasl.c:697  
#6  0x00b7283e in sasl_server_new () from /usr/lib/libsasl2.so.2
#7  0x00b72e3f in sasl_server_step () from /usr/lib/libsasl2.so.2
#8  0x0809450b in slap_sasl_bind (op=0x0, rs=0x9776370) at 
#9  0x08072718 in fe_op_bind (op=0x9777138, rs=0xb6c7c870) at 
#10 0x08071d99 in do_bind (op=0x9777138, rs=0xb6c7c870) at bind.c:200
#11 0x0805bd4c in connection_operation (ctx=0xb6c7c8f0, 
arg_v=0x9777138) at connection.c:1061  
#12 0x080d71a2 in ldap_int_thread_pool_wrapper (xpool=0x97246b0) at 
#13 0x00960dd8 in start_thread () from /lib/tls/libpthread.so.0
#14 0x001edd2a in clone () from /lib/tls/libc.so.6