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Re: Segfault in slapd 2.4.8 - syncrepl and glue (ITS#5430)

Duncan.Gibb@siriusit.co.uk wrote:

DG> Can anyone else reproduce this, or do we need to work on more examples?

After more experimentation, I believe this crash only happens if
replication between servers 1 and 2 (master of the main tree and
subordinate master respectively) has completed before server 3 (consumer
of 1) is started.

We've scripted a test which works for me against 2.4.8 and did work
against CVS HEAD until Howard committed
openldap-src/servers/slapd/syncrepl.c 2008-03-19 23:26:40 +0000.  That
changes the syncrepl<-->glue interaction such that the data from server
2 is never replicated to server 1 (a pre-requisite for this crash).
Maybe our config wrongly depends on the old behaviour.  I'll look at
that tomorrow.

Test rig (3.7K) is at


tar xzf openldap-its5430-scripted-test-2008-03-19.tar.gz
cd openldap-its5430-scripted-test-2008-03-19

Optionally copy CVS openldap-src from before the above commit into the
directory before invoking build.sh.

Probably only works on Linux.  Reproducible with bdb and hdb backends
using BDB 4.4 on Debian Lenny/i386 (bare metal).  Not reproducible with
the ldif backend because replication from 2 to 1 never happens.