Re: (ITS#6920) OpenLDAP 2.4.25 / Berkeley DB 4.8.30 Solaris 10 x86 slapd hangs - openldap-bugs

24 May 2011


      At Thu, 28 Apr 2011 18:05:43 GMT,
mslby@deshaw.com wrote:
...
My company uses OpenLDAP 2.4.25 with Berkeley DB 4.8.30 compiled on Solaris
10 x86 using Sun Studio. OpenLDAP is used as the backend for generic naming
services (passwd, group, netgroup etc?) as well as holding mail routing and
some custom data. We have master and slave servers and are using syncrepl
refresh and persist.
Are you using Solaris nss_ldap and ldap_cachemgr(1M) on your
Solaris 10 with OpenLDAP slapd? If so, Solaris libldap.so breaks
your slapd process as the following scenario:
(1) slapd calls some name service functions, e.g. getpwnam(3C).
  (2) Solaris nss_ldap (/usr/lib/nss_ldap.so.1) is loaded.
  (3) Solaris libldap.so (/usr/lib/libldap.so.5) is loaded.
  (4) Solaris libldap.so overrides ldap_*() and ber_*() functions
      in slapd (or OpenLDAP libldap_r.so and liblber.so).
  (5) OpenLDAP calls ldap_*() and ber_*() functions that are
      belong to Solaris libldap.so, not OpenLDAP's one.
See also:
http://www.openldap.org/lists/openldap-technical/200902/msg00000.html
  https://bugzilla.mozilla.org/show_bug.cgi?id=292127
  http://bugzilla.padl.com/show_bug.cgi?id=203
-- 
-- Name: SATOH Fumiyasu (fumiyas @ osstech co jp)
-- Business Home: http://www.OSSTech.co.jp/
-- Personal Home: http://www.SFO.jp/blog/

> Lately we have been experiencing hangs with slapd and I cannot figure out
> what the cause is. Things will be humming along and then slapd will simply
> stop accepting connections and answering any requests for reads/writes. We
> have set the loglevel to 256 and there is nothing in the logs that
> indicates what the issue it. At the time that the process goes catatonic all
> syslogs from slapd stop
> 
> I have not found a way to reproduce this on demand.
> 
> Today we have had three hangs and the truss ouput is exactly the same on
> all process. Once the slapd process gets in this state a simple kill does
> not work. The syslog always says that slapd is waiting for tasks to
> complete but this never happens. I need to kill -9 the pid.
> 
> I am going to include all of the debug info that I have collected and
> hopefully someone will have some idea what is going on. I also have a gcore
> of the process if anyone wants and info from that
> 
> All and any help is greatly appreciated