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(ITS#5161) delta-syncrepl mutex lockup

Full_Name: Quanah Gibson-Mount
Version: 2.3.37
OS: Linux 2.6
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

Several customers have found delta-syncrepl will lock up after a time.  Today it
occurred again, and this time some logging data was able to be gathered.  The
last operation logged was a MOD op.  This matches past lockups, which were also
either MOD or ADD operations.

The following files will be uploaded to the ftp site, where # will be the
assigned ITS number.


which is the db_stat information for the accesslog DB


which is the db_stat information for the main DB


which is the pstack information for the slapd process

Unfortunately no GDB info was retrieved this time, and reportedly gcore hung.

The most interesting part is I see no WRITE locks held in either DB, and all the
client threads are hung in a mutex.