Openldap 2.4.40-6.el6_7

RHEL 6.7

mdb backend

ldapmodify is hanging; the hang first evidenced itself in a bulk update. The hang occurs even for a simple update -- with debug set to 1 on the ldapmodify statement (using interactive mode) the block of output listed at below repeats endlessly with no change to the values displayed. The slapd audit log shows no update for the intended record.

The problem started after I added a significant amount of data; not new structural objects (OUs) but many entries under them. Have I reached some sort of threshold?

I have:

- stopped/started slapd;

- run a full slapcat and slapadd to a new database

I am running the monitor database; would there be data of value there about this condition?

mdb_stats output:

sudo mdb_stat -ef /etc/openldap/openldap-data

Environment Info

Map address: (nil)

Map size: 8589934592

Page size: 4096

Max pages: 2097152

Number of pages used: 618975

Last transaction ID: 3647

Max readers: 126

Number of readers used: 0

Freelist Status

Tree depth: 1

Branch pages: 0

Leaf pages: 1

Overflow pages: 11

Entries: 7

Free pages: 5233

Status of Main DB

Tree depth: 1

Branch pages: 0

Leaf pages: 1

Overflow pages: 0

Entries: 16

debug output from ldapmodify:

** ld 0x1ed4e30 Outstanding Requests:

* msgid 2, origid 2, status InProgress

outstanding referrals 0, parent count 0

ld 0x1ed4e30 request count 1 (abandoned 0)

** ld 0x1ed4e30 Response Queue:

Empty

ld 0x1ed4e30 response count 0

ldap_chkResponseList ld 0x1ed4e30 msgid 2 all 1

ldap_chkResponseList returns ld 0x1ed4e30 NULL

ldap_int_select

ldap_result ld 0x1ed4e30 msgid 2

wait4msg ld 0x1ed4e30 msgid 2 (timeout 100000 usec)

wait4msg continue ld 0x1ed4e30 msgid 2 all 1

** ld 0x1ed4e30 Connections:

* host: localhost port: 389 (default)

refcnt: 2 status: Connected

last used: Thu Mar 3 10:04:05 2016

** ld 0x1ed4e30 Outstanding Requests:

* msgid 2, origid 2, status InProgress

outstanding referrals 0, parent count 0

ld 0x1ed4e30 request count 1 (abandoned 0)

** ld 0x1ed4e30 Response Queue:

Empty

ld 0x1ed4e30 response count 0

ldap_chkResponseList ld 0x1ed4e30 msgid 2 all 1

ldap_chkResponseList returns ld 0x1ed4e30 NULL

ldap_int_select

ldap_result ld 0x1ed4e30 msgid 2

wait4msg ld 0x1ed4e30 msgid 2 (timeout 100000 usec)

wait4msg continue ld 0x1ed4e30 msgid 2 all 1

** ld 0x1ed4e30 Connections:

* host: localhost port: 389 (default)

refcnt: 2 status: Connected

last used: Thu Mar 3 10:04:05 2016

...etc