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Re: slapd hangs up and uses 100% CPU (v2.1.12 release)
For those of you interested, this issue is fixed in CVS. Check out
http://www.OpenLDAP.org/its/index.cgi?findid=2195
Thanks to Jonghyuk Choi!
-Igor
On Wed, 5 Feb 2003, Igor Brezac wrote:
> On Wed, 5 Feb 2003, Kirill Ponazdyr wrote:
>
> > Greetings,
> >
> > When i truss (Solarisīs strace) the hanging process I see a loop made of:
> >
> > /4: yield() = 0
> >
> > lines.
> >
> > I have tried to recompile bdb in its newest version, compile with -O
> > instead -O3 as I usually do, no change at all.
> >
> > I also tried to change file descriptor soft limit to 1024, systemwide. No
> > change again.
> >
> > Now I gaved up and went to ldbm on the base of gdbm, it works flawlessly.
> > It really seems to be a "exclusive" bdb backend problem.
> >
>
> I can reproduce this on Solaris 9.
> Check out http://www.OpenLDAP.org/its/index.cgi?findid=2195
>
> Do you use 'group' in your acls?
>
> -Igor
>
> > Regards
> >
> > Kirill
> >
> > > I have the same pb, but cannot reproduct it as I want ...
> > > However I noticed that when I stoped playing with bdb tunning it worked
> > > better ... By playing with bdb, i mean using the cachesize and
> > > checkpoint directives in slapd.conf, if you put silly values, as I might
> > > have done, this will maybe trash slapd ... ? Since I put reseaonable
> > > values, now it seems to work fine .
> > >
> > > my slapd.conf
> > >
> > > #cachesize 6000
> > > checkpoint 100000 360
> > > #dbnosync
> > >
> > > and DB_Config file for my database
> > >
> > > $ cat /var/lib/ldap/int/DB_CONFIG
> > > #set the logfile size to 100MB.
> > > #set_lg_max 104857600
> > > #set the in-memory log buffer size
> > > set_lg_bsize 204800
> > > #temporary while we're slapadding the database
> > > set_flags DB_TXN_NOSYNC
> > > #set the (per db?) cachesize to 0GB + X bytes, split into N pieces of
> > > memory set_cachesize 0 5120000 2
> > >
> > >
> > > Although I still don't know which ones are used, slapd.conf directives
> > > or DB_CONFIG ones ??
> > >
> > > when slapd takes 100% , could you make a strace -p pid (pid=pid of
> > > slapd at 100%) to check what is is actually doing. For me it was looping
> > > on something, can't remember what, but it's somewhere in the list .
> > >
> > > Let us know if you find an explanation.
> > >
> > > Thanks.
> > >
> > > Kirill Ponazdyr wrote:
> > >> Greetings,
> > >>
> > >> We have a problem with slapd hanging up and using 100% CPU time on our
> > >> machine when we try to do operations on a tree, it happens in random
> > >> places but we could find one where it happens every time, when we try
> > >> to delete a certain object in the tree. We can repro the problem as
> > >> many times as we wish. Unfortunately the slapd has to be killed by
> > >> kill -9 and this corrupts our databases, so we have to reload a
> > >> directory (PITA).
> > >>
> > >> Thus two questions: Why is this stuff happening ? and is there a way
> > >> to run a consistency check on BDB databases, thus not requiering the
> > >> full reload ?
> > >>
> > >> Here are release infos, configs and debug output:
> > >>
> > >> Releases:
> > >> -----------------------------------------
> > >> Openldap v2.1.12 release
> > >> Bdb libraries 4.1.24
> > >> Solaris 9 Sparc with latest patch cluster
> > >>
> > >> HW:
> > >> -----------------------------------------
> > >> Sun Netra T1125 with 1 Gig RAM.
> > >>
> > >>
> > >> DB_CONFIG
> > >> -------------------------------
> > >> set_lg_bsize 2097152
> > >> set_cachesize 0 209715200 2
> > >>
> > >>
> > >> slapd.conf:
> > >> --------------------------------------------------------------
> > >> include /etc/openldap/schema/core.schema
> > >> include /etc/openldap/schema/cosine.schema
> > >> include /etc/openldap/schema/nis.schema
> > >> include /etc/openldap/schema/qmail.schema
> > >> include /etc/openldap/schema/inetorgperson.schema
> > >> include /etc/openldap/schema/qmailControl.schema
> > >> pidfile /var/run/slapd.pid
> > >> argsfile /var/run/slapd.args
> > >> disallow bind_anon
> > >> allow bind_v2
> > >>
> > >> database bdb
> > >> suffix "o=Codeangels, c=CH"
> > >> directory /export/ldap-databases/codeangels
> > >> rootdn ** censored **
> > >> rootpw ** censored **
> > >> index cn,sn,uid pres,eq,approx,sub
> > >> index objectClass eq
> > >> ... snip ....
> > >>
> > >> Debug:
> > >> ---------------- snip -------------------
> > >> => access_allowed: write access granted by write(=wrscx)
> > >> ====> bdb_unlocked_cache_return_entry_r( 526 ): returned (0)
> > >> bdb_dn2entry_rw("cn=managers,ou=codeangels.com,ou=mail,ou=itaccounts,o=codeangels,c=ch")
> > >> => bdb_dn2id_matched(
> > >> "cn=managers,ou=codeangels.com,ou=mail,ou=itaccounts,o=codeangels,c=ch"
> > >> ) ====>
> > >> bdb_cache_find_entry_dn2id("cn=managers,ou=codeangels.com,ou=mail,ou=itaccounts,o=codeangels,c=ch"):
> > >> 542 (1 tries)
> > >> bdb_cache_entry_db_lock: entry
> > >> cn=managers,ou=codeangels.com,ou=mail,ou=itaccounts,o=codeangels,c=ch,
> > >> rw 1, rc -30995 ====> bdb_cache_find_entry_id( 542 ): 542 (busy) 2
> > >> locker = -2147483031
> > >> bdb_cache_entry_db_lock: entry
> > >> cn=managers,ou=codeangels.com,ou=mail,ou=itaccounts,o=codeangels,c=ch,
> > >> rw 1, rc -30995 ====> bdb_cache_find_entry_id( 542 ): 542 (busy) 2
> > >> locker = -2147483031
> > >> bdb_cache_entry_db_lock: entry
> > >> cn=managers,ou=codeangels.com,ou=mail,ou=itaccounts,o=codeangels,c=ch,
> > >> rw 1, rc -30995 ====> bdb_cache_find_entry_id( 542 ): 542 (busy) 2
> > >> locker = -2147483031
> > >> .... repeat above 2 lines until killed ....
> > >> ---------------- snip -------------------
> > >>
> > >> ---
> > >> Kirill Ponazdyr
> > >> Technical Director
> > >> Codeangels Solutions
> > >> Tel: +41 (0)43 844 90 10
> > >> Fax: +41 (0)43 844 90 12
> > >>
> > >>
> >
> >
> >
> >
>
>
--
Igor