Hi,
unfortunately i was not able to reproduce the exact problem with the segfault, but, after a few updates, we still have the problem that with replication enabled the slapd freezes during a write operation.
SETUP DESCRIPTION:
Openldap Version 2.4.36 Back-MDB (we have issues for quite a while, even when we where running on bdb)
All write and read requests are directed to the active node, so the passive node is replicating.
So, if I did not understand something wrong I have two threads: The main thread, and the one which is doing the replication.
Netstat of TCP Replication connections, the second is initiated by the passive system polling from the active
tcp 0 53 10.169.127.13:389 10.169.126.13:43340 ESTABLISHED tcp 1905336 0 10.169.127.13:52384 10.169.126.13:389 ESTABLISHED
top -H of the LDAP Processes:
7767 ldap 20 0 84.4g 7.1g 6.9g S 1 10.1 1:02.13 slapd 7768 ldap 20 0 84.4g 7.1g 6.9g S 0 10.1 7:54.44 slapd 8023 ldap 20 0 84.4g 7.1g 6.9g S 0 10.1 0:32.31 slapd 7766 ldap 20 0 84.4g 7.1g 6.9g S 0 10.1 0:00.00 slapd 7769 ldap 20 0 84.4g 7.1g 6.9g S 0 10.1 0:32.81 slapd 7770 ldap 20 0 84.4g 7.1g 6.9g S 0 10.1 7:44.94 slapd 8024 ldap 20 0 84.4g 7.1g 6.9g t 0 10.1 0:32.53 slapd
PASTEBIN:
I Pastebinned all the backtraces to:
I hope this helps to track back the problem.
Kind regards - Mit freundlichen Grüßen
i.A. Hans Freitag » Linux Administrator
ENTIRETEC AG . Pforzheimer Strasse 33 . 01189 Dresden . Germany T: +49.351.41355.0 . M: . F: +49.351.41355.99 E: hans.freitag@entiretec.com
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-----Ursprüngliche Nachricht----- Von: openldap-bugs-bounces@OpenLDAP.org [mailto:openldap-bugs- bounces@OpenLDAP.org] Im Auftrag von quanah@zimbra.com Gesendet: Montag, 5. August 2013 05:15 An: openldap-its@openldap.org Betreff: Re: (ITS#7655) segfault during initial mirror of multimaster delta replication
--On Sunday, August 04, 2013 4:27 PM +0000 hans.freitag@entiretec.com wrote:
Full_Name: Hans Freitag Version: 2.4.35 and 33 OS: SLES 11SP2 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (193.200.138.3)
I have a Multimaster Delta replication setup here with bdb on a 18 GB Database.
After a crash due to a full disk I made a new database on one node
ans
started over.
The empty node started to replicate, from the full one but after a
while
(approx. 2GB) it crashed with a segfault:
Aug 4 11:45:32 mhr-dd-lda-01 kernel: [52189.476209] slapd[10158]: segfault at 20 ip 00007ff97ebfabc0 sp 00007ff6e57e6b38 error 4 in libc-2.11.1.so[7ff97eb79000+155000]
So i thought, maybe it is not e good Idea to put in a package for SP2
in a
machine running SP1 so my first attempt to solve was an upgrade.
After the
upgrade I got this:
Aug 4 12:46:29 mhr-dd-lda-01 kernel: [ 1414.757587] slapd[3704]: segfault at 20 ip 00007fc82eee6182 sp 00007fc592e0acf0 error 4 in slapd[7fc82ee7a000+1e6000]
So I created a brandnew openldap RPM 2.4.35 rpm to try out if the
problem
is maybe related to the 2.4.33 version I am running. But fail:
Aug 4 13:47:19 mhr-dd-lda-01 kernel: [ 5063.074410] slapd[8749]: segfault at 20 ip 00007fcbc1b537dc sp 00007fc92624fb88 error 4 in slapd[7fcbc1ac8000+1ea000]
At the moment I deactivated the accesslogging on the node which seems
to
work. I will know for sure in a few hours. ;-) I can try to reproduce that on a backup node next week. Whenn all the main nodes are up and running again. :)
I would suggest you build with debugging symbols, enable core files, and provide a backtrace of the problem. What you have provided does not give any useful information for debugging purposes. You also fail to state the backend you are using (back-bdb or back-hdb).
For information on how to provide a backtrace:
http://www.openldap.org/faq/data/cache/59.html
Regards, Quanah
--
Quanah Gibson-Mount Lead Engineer Zimbra, Inc
Zimbra :: the leader in open source messaging and collaboration
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hans.freitag＠entiretec.com