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Segmentation fault in OpenLDAP 2.1.25

Hello.  I hope you are all doing well.

When I query an 'ldap' backend that aliases to a BDB backend on the same server (running OpenLDAP 2.1.25, the stable release), slapd exits with a segmentation fault. The ldapsearch query sees

ldapsearch -b 'o=WFU,c=US' -x
ldap_result: Can't contact LDAP server (81)

and the slapd process dies. slapd says it segfaults when you run it in the foreground. The last few lines are

--last part of 'slapd -d -1'--
read1msg: V2 referral chased, mark request completed, id = 2
new result: res_errno: 32, res_error: <>, res_matched: <>
read1msg: 0 new referrals
read1msg: mark request completed, id = 2
request 2 done
res_errno: 32, res_error: <>, res_matched: <>
ldap_free_request (origid 2, msgid 2)
ldap_free_connection: refcnt 1
ber_scanf fmt ({iaa) ber:
ber_dump: buf=0x08207820 ptr=0x08207823 end=0x0820782c len=9
0000: 65 07 0a 01 20 04 00 04 00 e... ....

ber_scanf fmt (}) ber:
ber_dump: buf=0x08207820 ptr=0x0820782c end=0x0820782c len=0

daemon: select: listen=6 active_threads=1 tvp=NULL
--end 'slapd -d -1'--

My amateur take on the log is that the failure is somewhere between the query resolution on the BDB backend and the translation back through the ldap backend.

slapd.conf's configuration for o=WFU,c=US looks like

# the 'fake' database, for legacy clients
database        ldap
suffix          "o=WFU,c=US"
uri             ldap://localhost
suffixmassage   o=WFU,c=US      ou=Users,dc=wfu,dc=edu

I have put extensive information up at http://www.wfu.edu/~borwicjh/examples/openldap-2.1.25-segfault/ , including my slapd.conf , the output of 'slapd -d -1', and the relevant local4.* information from syslog.

The twist is, I installed OpenLDAP 2.1.25 from an RPM I created for internal use. The spec file for that RPM is available on the above-mentioned website, too. I'm building the RPM on the same OS I'm deploying it on: Red Hat Enterprise 3.0. (I'm creating an RPM for 2.1.25 so I don't have to use Red Hat's OpenLDAP 2.0 RPM.)

Relevant information from the spec file:

%configure \
	--enable-ldap \
	--libexecdir=%{_sbindir} \

(All that's being turned on is the ldap backend.)

Does anyone know what's going on?

John Borwick, Systems Infrastructure
Wake Forest University

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