Re: (ITS#6362) slapd 2.4.19 Segmentation fault under load

[alexs@ulgsm.ru]

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* mbackes@symas.com <mbackes@symas.com> [2009-11-10 22:55:10 +0000]:

> Hello, Aleksey.
>=20
> > Openldap 2.4.19 installed from freebsd ports. All configs in defauls =
=20
> > Freebsd 7.2 amd64 Slapd built with the "-g" flag and install with =20
> > the make install STRIP=3D""
>=20
> Okay.
>=20
> > Used backends db46-4.6.21.4, db47-4.7.25.4 latest from freebsd ports.
>=20
> >        libdb-4.6.so.0 =3D> /usr/local/lib/libdb-4.6.so.0 (0x800a97000)
>=20
> At the same time?  Your ldd list below shows only berkeley db 4.6.  =20
> These don't mix...
Not same time. I  tried with both backends. Results are same.


>=20
> > In slapd config added using hdb as backend and indexes.  Testing =20
> > database consist of 1000 users accounts with minimum attributes.  On =
=20
> > stress test load slapd Segmentation fault in 10-30 sec.
>=20
> What sort of operations?
Reading (Binds and searches).=20
Test script is loop of id command checking ldap via nss_ldap.


>=20
> > Program received signal SIGSEGV, Segmentation fault.
> > [Switching to Thread 0x803404560 (LWP 100116)]
> > 0x0000000802d5aa4b in hdb_idl_fetch_key (be=3DError accessing memory =
=20
> > address
> > 0x7ffffd9f9f38: Bad       s.
> > ) at idl.c:511
>=20
> Does it always fail at the same location?  How reproducible is this?
Often it is fail in "hdb_idl_fetch_key (be=3DError accessing memory address=
".

100% Reproducible on different hardware. On our normal work, slapd fails
every 2-3 hours, on stress test slapd fail in 10-30 sec.

Problem on freebsd7.x,8 and openldap2.3.43,2.4.18,2.4.19=20
I tryed on debian lenny and openldap2.4.11 and netbsd5.0.1 and
openldap2.4.16 it rock stable.
I think problem some where in freebsd and bdb backends.=20
Because freebsd7.1 openldap2.3.43 with depricated ldbm don`t fail on
reading.=20


Ask if need any information.=20
Also I can give a shell access to testing server.

=20


>=20
> Matthew Backes
> Symas Corporation
> mbackes@symas.com

--=20
Email: alexs@ulgsm.ru
Email/Jabber: alexs@ulgsm.ru

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