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(ITS#4138) assertion error in slapd_set_read

Full_Name: Andreas Hasenack
Version: 2.3.11
OS: linux
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

I have a 2.3.11 that is crashing during the night. To try to reproduce it, I ran
some thousand queries (with START_TLS [-ZZ]) while the server was running with
-d -1.
After about 16k queries and a 950Mb log file, I got this assertion error:

slapd: daemon.c:524: slapd_set_read: Assertion `((slap_daemon.sd_index[s]) !=
-1)' failed

A little bit before this I have some TLS errors:
tls_read: want=5 error=Resource temporarily unavailable

(could be relevant or not).

The server hardware is a Xeon 3.2GHz (HT) with 1.5Gb of RAM and U320 SCSI disks
in mirror raid (IBM xseries 336). I'm running an SMP kernel 2.6.12-12mdksmp
(stock from Mandriva 2006).