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Re: (ITS#7378) Slapd hangs on bdb write lock
by hyc＠symas.com 03 Sep '12

03 Sep '12

nikolai(a)net24.co.nz wrote: > Full_Name: Nikolai Schupbach > Version: 2.4.31 > OS: FreeBSD > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (202.78.158.60) > > > We are experiencing frequent hangs in slapd. Once hung we can continue to > connect, but all searches will just hang indefinitely until we kill -9 the slapd > process and restart it. The directory is used for mail routing and we have been > migrating to it from an existing directory server over the last 3 weeks - we > have noted the busier the directory becomes the more often it hangs (now once > every 2 days). > > We have one master and 10 syncrepl read only replicas - the master is used > mainly for writes and has not hung yet, but most of the replicas have hung at > least once. The replicas receive anywhere between 50 to 300 searches/sec, while > the master would only get 1/sec. There are 45k entries in the directory. > > We are running: > > FreeBSD 8.3/9.0 x64 > OpenLDAP 2.4.31 > Berkeley DB 4.6.21 > > The old directory we are migrating from has the same load and is also running > OpenLDAP, but has been rock solid for 5 years. It is running Berkeley DB 4.3.29 > and OpenLDAP 2.3.27. > > We have managed to collect db_stat lock information, which indicates the same > issue each time - a write lock on dn2id.bdb. It's more than that. Your db_stat shows that a single thread has 3 active transactions. This should never happen: 8000a85e dd= 0 locks held 2 write locks 0 pid/thread 88000/34386526336 8000a85e READ 1 HELD 0xb19a8 len: 9 data: 40xa800000000000000 8000a85e READ 1 HELD 0xb26c8 len: 9 data: 60xa800000000000000 8000a85f dd= 0 locks held 8 write locks 4 pid/thread 88000/34386526336 8000a85f READ 1 WAIT dn2id.bdb page 559 8000a85f READ 1 HELD dn2id.bdb page 768 8000a85f WRITE 2 HELD dn2id.bdb page 1362 8000a85f READ 2 HELD dn2id.bdb page 1362 8000a85f WRITE 2 HELD dn2id.bdb page 1353 8000a85f READ 2 HELD dn2id.bdb page 1353 8000a85f WRITE 2 HELD dn2id.bdb page 933 8000a85f READ 1 HELD dn2id.bdb page 933 8000a85f WRITE 4 HELD dn2id.bdb page 219 80001047 dd=28 locks held 1 write locks 1 pid/thread 88000/34386526336 80001047 WRITE 1 HELD dn2id.bdb page 559 I would first recommend changing from BDB 4.6.21 to some other version. There are no code paths in back-bdb where we would ever return without either committing or aborting the current transactions, so this appears to be a BDB bug, not an OpenLDAP bug. > We have also collected the backtrace for all the threads which I have uploaded > to: > > ftp://ftp.openldap.org/incoming/nikolai-gdb-120902.txt > > The full db_stat output is located at: > > ftp://ftp.openldap.org/incoming/nikolai-dbstat-120902.txt -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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RE: (ITS#7364) mdb: clean up POSIX semaphores on environment close.
by cyrille.maucci＠hp.com 03 Sep '12

03 Sep '12

-----Original Message----- From: openldap-bugs-bounces(a)OpenLDAP.org [mailto:openldap-bugs-bounces@OpenLDAP.org] On Behalf Of hyc(a)symas.com >> Another possibility is to just use SysV semaphores instead of POSIX semaphores. >> Then you can use the ipcs(1) command to manually cleanup. BerkeleyDB uses >> SysV shared memory when you specify a shared memory environment and it >> appears that SysV semaphore support is actually more widespread than POSIX semaphores. Just to mention that at least on HPUX, Posix semaphores are more efficient than SysV ones. ++Cyrille

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Re: (ITS#7364) mdb: clean up POSIX semaphores on environment close.
by hyc＠symas.com 03 Sep '12

03 Sep '12

h.b.furuseth(a)usit.uio.no wrote: > Reopening this. > > > This is worse with a database with is intended to be used by > different users (A and B): This is pretty much never a use case we would worry about. In most applications, a single userID creates and operates on the DB. > A opens the DB and creates the semaphores with e.g. mode 0660. > B opens it, A closes, B closes - and fails sem_unlink() which > only A and root can do. > > Next, B (or C) fails mdb_env_open() because sem_unlink() fails > again. > > The work-around I can think of is a "multi-uid" mode which instead > resets the semaphore with sem_post() if sem_getvalue() returns 0. > I don't know how ugly that is considered to be. Could ask > comp.programming.unix, or check what Berkeley DB does. That would be OK in general. It still leaves the question of how to remove the semaphore if the DB is being destroyed. But it's probably not worth the trouble to worry about this so much. Those OSes should just get their act together and support the POSIX process-shared mutexes. > This mode > should use mode 0666 for the semaphores (temporarily setting umask > 0, yuck), Definitely not. The caller specifies a mode; if they want 0666 they should configure it as such. > or it should not sem_unlink() since next user may create > the semaphores with a group which gives the wrong users access. Same as today where running slapadd with the wrong uid causes trouble for the following slapd. The answer is obvious: use the right uid when accessing the DB. > Other matters with the current implementation - I'll patch these: > > mdb_env_excl_lock() need not retry getting a non-exclusive lock when > closing. mdb_env_close() can pass *excl = -1 to tell it not to. > > mdb_env_setup_locks() can sem_unlink both semaphores before doing > anything else, so that reopening a database as root will clean up. > Drop the error checks of sem_unlink (so both get called), instead > use O_EXCL in sem_open(,O_CREAT,,). Unless I'm missing something, > the error checks just work like an emulation of O_EXCL anyway. The sem_unlink() and sem_open() sequence isn't ideal, certainly. I would prefer to just use the existing semaphore. Another possibility is to just use SysV semaphores instead of POSIX semaphores. Then you can use the ipcs(1) command to manually cleanup. BerkeleyDB uses SysV shared memory when you specify a shared memory environment and it appears that SysV semaphore support is actually more widespread than POSIX semaphores. -- -- Howard Chu CTO, Symas Corp. http://www.symas.com Director, Highland Sun http://highlandsun.com/hyc/ Chief Architect, OpenLDAP http://www.openldap.org/project/

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Re: (ITS#7378) Slapd hangs on bdb write lock
by michael＠stroeder.com 02 Sep '12

02 Sep '12

This is a cryptographically signed message in MIME format. --------------ms080100030105010600070605 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable A couple of days ago I had a hang with OpenLDAP 2.4.32 / back-hdb running= on Debian Squeeze, self-compiled against BDB 4.8.30. It seemed Database was locked as restarting slapd of even rebooting OS did not help. Unfortunate= ly I had to bring up the system as fast as possible and could not examine the = problem. The system has only 200 entries and not much load yet. I had renamed entr= ies with web2ldap when all 4 masters (4-way MMR) locked up one after the othe= r. 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Re: (ITS#7378) Slapd hangs on bdb write lock
by nikolai＠net24.co.nz 02 Sep '12

02 Sep '12

I haven't yet - I wanted to collect information before making any changes. I did look at that fix and wasn't confident it would solve our problem. You're right though - I need to test it to rule it out. I will upgrade all the servers to 2.4.32 and report back. On 2/09/2012, at 7:07 AM, Quanah Gibson-Mount wrote: > --On Saturday, September 01, 2012 1:46 PM +0000 nikolai(a)net24.co.nz wrote: > >> Full_Name: Nikolai Schupbach >> Version: 2.4.31 >> OS: FreeBSD >> URL: ftp://ftp.openldap.org/incoming/ >> Submission from: (NULL) (202.78.158.60) > > Have you confirmed this isn't the same thing ITS#7222, fixed in OpenLDAP 2.4.32? > > --Quanah > > > > -- > > Quanah Gibson-Mount > Sr. Member of Technical Staff > Zimbra, Inc > A Division of VMware, Inc. > -------------------- > Zimbra :: the leader in open source messaging and collaboration

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Re: (ITS#7378) Slapd hangs on bdb write lock
by quanah＠zimbra.com 01 Sep '12

01 Sep '12

--On Saturday, September 01, 2012 1:46 PM +0000 nikolai(a)net24.co.nz wrote: > Full_Name: Nikolai Schupbach > Version: 2.4.31 > OS: FreeBSD > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (202.78.158.60) Have you confirmed this isn't the same thing ITS#7222, fixed in OpenLDAP 2.4.32? --Quanah -- Quanah Gibson-Mount Sr. Member of Technical Staff Zimbra, Inc A Division of VMware, Inc. -------------------- Zimbra :: the leader in open source messaging and collaboration

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(ITS#7378) Slapd hangs on bdb write lock
by nikolai＠net24.co.nz 01 Sep '12

01 Sep '12

Full_Name: Nikolai Schupbach Version: 2.4.31 OS: FreeBSD URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (202.78.158.60) We are experiencing frequent hangs in slapd. Once hung we can continue to connect, but all searches will just hang indefinitely until we kill -9 the slapd process and restart it. The directory is used for mail routing and we have been migrating to it from an existing directory server over the last 3 weeks - we have noted the busier the directory becomes the more often it hangs (now once every 2 days). We have one master and 10 syncrepl read only replicas - the master is used mainly for writes and has not hung yet, but most of the replicas have hung at least once. The replicas receive anywhere between 50 to 300 searches/sec, while the master would only get 1/sec. There are 45k entries in the directory. We are running: FreeBSD 8.3/9.0 x64 OpenLDAP 2.4.31 Berkeley DB 4.6.21 The old directory we are migrating from has the same load and is also running OpenLDAP, but has been rock solid for 5 years. It is running Berkeley DB 4.3.29 and OpenLDAP 2.3.27. We have managed to collect db_stat lock information, which indicates the same issue each time - a write lock on dn2id.bdb. Locks grouped by object: Locker Mode Count Status ----------------- Object --------------- 8000a85e READ 1 HELD 0xb26c8 len: 9 data: 60xa800000000000000 8a READ 1 HELD id2entry.bdb handle 0 8c READ 1 HELD dn2id.bdb handle 0 96 READ 1 HELD objectClass.bdb handle 0 93 READ 1 HELD entryCSN.bdb handle 0 90 READ 1 HELD entryUUID.bdb handle 0 8000a85f WRITE 4 HELD dn2id.bdb page 219 80000782 READ 1 HELD dn2id.bdb page 768 80000a45 READ 1 HELD dn2id.bdb page 768 80000b9e READ 1 HELD dn2id.bdb page 768 800006a0 READ 1 HELD dn2id.bdb page 768 80000771 READ 1 HELD dn2id.bdb page 768 80000534 READ 1 HELD dn2id.bdb page 768 80000a44 READ 1 HELD dn2id.bdb page 768 80000641 READ 1 HELD dn2id.bdb page 768 80001049 READ 1 HELD dn2id.bdb page 768 8000104a READ 1 HELD dn2id.bdb page 768 80001048 READ 1 HELD dn2id.bdb page 768 80000783 READ 1 HELD dn2id.bdb page 768 80000535 READ 1 HELD dn2id.bdb page 768 8000066e READ 1 HELD dn2id.bdb page 768 80000697 READ 1 HELD dn2id.bdb page 768 8000a85f READ 1 HELD dn2id.bdb page 768 8000a85e READ 1 HELD 0xb19a8 len: 9 data: 40xa800000000000000 8000a85f READ 1 HELD dn2id.bdb page 933 8000a85f WRITE 2 HELD dn2id.bdb page 933 80001047 WRITE 1 HELD dn2id.bdb page 559 80000782 READ 1 WAIT dn2id.bdb page 559 80000a45 READ 1 WAIT dn2id.bdb page 559 80000b9e READ 1 WAIT dn2id.bdb page 559 800006a0 READ 1 WAIT dn2id.bdb page 559 80000771 READ 1 WAIT dn2id.bdb page 559 80000534 READ 1 WAIT dn2id.bdb page 559 80000a44 READ 1 WAIT dn2id.bdb page 559 80000641 READ 1 WAIT dn2id.bdb page 559 80001049 READ 1 WAIT dn2id.bdb page 559 8000104a READ 1 WAIT dn2id.bdb page 559 80001048 READ 1 WAIT dn2id.bdb page 559 80000783 READ 1 WAIT dn2id.bdb page 559 80000535 READ 1 WAIT dn2id.bdb page 559 8000066e READ 1 WAIT dn2id.bdb page 559 80000697 READ 1 WAIT dn2id.bdb page 559 8000a85f READ 1 WAIT dn2id.bdb page 559 8000a85f READ 2 HELD dn2id.bdb page 1362 8000a85f WRITE 2 HELD dn2id.bdb page 1362 8000a85f READ 2 HELD dn2id.bdb page 1353 8000a85f WRITE 2 HELD dn2id.bdb page 1353 b6 READ 1 HELD uid.bdb handle 0 a5 READ 1 HELD mail.bdb handle 0 af READ 1 HELD mailLocalAddress.bdb handle 0 9b READ 1 HELD miLoginid.bdb handle 0 aa READ 1 HELD mailHost.bdb handle 0 bb READ 1 HELD miDomainName.bdb handle 0 c0 READ 1 HELD mpMailHost.bdb handle 0 a0 READ 1 HELD mpMailUserType.bdb handle 0 We have also collected the backtrace for all the threads which I have uploaded to: ftp://ftp.openldap.org/incoming/nikolai-gdb-120902.txt The full db_stat output is located at: ftp://ftp.openldap.org/incoming/nikolai-dbstat-120902.txt Our DB_CONFIG: # One 512MB cache set_cachesize 0 536870912 1 # Transaction Log settings set_lg_regionmax 1048576 set_lg_max 10485760 set_lg_bsize 2097152 set_flags DB_LOG_AUTOREMOVE # Increase lock maximums set_lk_max_locks 2000 set_lk_max_lockers 2000 set_lk_max_objects 2000 Our slapd.conf on our replicas: # Load the following schema files include /usr/local/etc/openldap/schema/core.schema include /usr/local/etc/openldap/schema/cosine.schema include /usr/local/etc/openldap/schema/nis.schema include /usr/local/etc/openldap/schema/inetorgperson.schema include /usr/local/etc/openldap/schema/misc.schema include /usr/local/etc/openldap/schema/mirapoint.schema include /usr/local/etc/openldap/schema/smp.schema # Runtime settings for slapd pidfile /var/run/openldap/slapd.pid argsfile /var/run/openldap/slapd.args loglevel none # TLS security options for slapd. TLSCipherSuite HIGH TLSCACertificateFile /usr/local/etc/openldap/tls/ca-cert.pem TLSCertificateFile /usr/local/etc/openldap/tls/server-cert.pem TLSCertificateKeyFile /usr/local/etc/openldap/tls/server-key.pem # This option configures one or more hashes to be used in generation # of user passwords stored in the userPassword attribute during # processing of LDAP Password Modify Extended Operations (RFC 3062). password-hash {SSHA} # Load dynamic backend modules: modulepath /usr/local/libexec/openldap moduleload back_bdb moduleload back_monitor # Do not limit size or time of requests. sizelimit unlimited timelimit unlimited # Require authentication prior to directory operations require authc ############################################################################### # BDB Database Definitions # # The following configuration directives relate to bdb database definitions ############################################################################### # The remaining configuration directives relate to bdb database definitions database bdb suffix "o=top" rootdn "cn=root,o=top" # Cleartext passwords, especially for the rootdn, should # be avoid. See slappasswd(8) and slapd.conf(5) for details. rootpw {SSHA}********** # The database directory must exist prior to running slapd and # should only be accessible by the slapd and slap tools. directory /var/db/openldap-data # Indices to maintain index cn eq,sub,pres index entryUUID eq index entryCSN eq index mail eq,sub,pres index mailHost eq index mailLocalAddress eq,sub,pres index miDomainName eq,sub index miLoginId eq,pres index mpMailHost eq index mpMailUserType eq index mpSystemRole eq index objectClass eq,pres index uid eq,pres # Specify the number of entries which should be held in memory cachesize 200000 # Set transactional checkpoint checkpoint 512 60 ############################################################################### # LDAP Sync Replication # # A unique replica id number is required for each replication client ############################################################################### # LDAP sync replication settings syncrepl rid=36 provider=ldaps://ldapmaster/ type=refreshAndPersist retry=30,+ searchbase="o=top" filter="(objectClass=*)" scope=sub attrs="*" sizelimit=unlimited timelimit=unlimited schemachecking=off bindmethod=simple binddn="cn=replica,ou=users,ou=directory,o=top" credentials=********** # Where to refer ldap updates to updateref ldaps://ldapmaster/ ############################################################################### # LDAP Statistics # # The OpenLDAP server can be configured to provide real time performance # statistics through the monitor branch. ############################################################################### # Enable the statistics monitoring database database monitor # Allow access to monitoring user only access to dn.subtree="cn=monitor" by dn.exact="cn=monitor,ou=users,ou=directory,o=top" read by * none Sincerely, Nikolai Schupbach

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Re: (ITS#7364) mdb: clean up POSIX semaphores on environment close.
by h.b.furuseth＠usit.uio.no 01 Sep '12

01 Sep '12

Reopening this. This is worse with a database with is intended to be used by different users (A and B): A opens the DB and creates the semaphores with e.g. mode 0660. B opens it, A closes, B closes - and fails sem_unlink() which only A and root can do. Next, B (or C) fails mdb_env_open() because sem_unlink() fails again. The work-around I can think of is a "multi-uid" mode which instead resets the semaphore with sem_post() if sem_getvalue() returns 0. I don't know how ugly that is considered to be. Could ask comp.programming.unix, or check what Berkeley DB does. This mode should use mode 0666 for the semaphores (temporarily setting umask 0, yuck), or it should not sem_unlink() since next user may create the semaphores with a group which gives the wrong users access. Or root may give it root-only access, as in the original report. If not unlinking, we need a special "remove database + semaphores" API call. Or use some other sync primitive, like file locks. The Linux manual says these work over NFS though, which sounds like they must be rather slow. flock() does not, but this time mdb would need to seek first. I don't know which sync variants BSD offers. Other matters with the current implementation - I'll patch these: mdb_env_excl_lock() need not retry getting a non-exclusive lock when closing. mdb_env_close() can pass *excl = -1 to tell it not to. mdb_env_setup_locks() can sem_unlink both semaphores before doing anything else, so that reopening a database as root will clean up. Drop the error checks of sem_unlink (so both get called), instead use O_EXCL in sem_open(,O_CREAT,,). Unless I'm missing something, the error checks just work like an emulation of O_EXCL anyway.

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Re: (ITS#7363) libmdb should use POSIX semaphores on non-apple BSD systems too.
by h.b.furuseth＠usit.uio.no 01 Sep '12

01 Sep '12

Chris Mikkelson writes: > The *BSD systems define PTHREAD_PROCESS_SHARED but do > not implement sharable pthread mutexes. The flag name > is part of the API, but implementation of the behavior > it requests is optional. Yes, sorry about that. How about something like a "__BSD" preprocessor symbol to replace "BSD"? There surely is one. It'll start with an underscore followed by either another underscore or an uppercase letter. -- Hallvard

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Re: (ITS#7377) Poor libmdb error handling
by Hallvard B Furuseth 01 Sep '12

01 Sep '12

Howard Chu wrote: >h.b.furuseth(a)usit.uio.no wrote: >> Maybe add a flag to request error paranoia, like setting >> PTHREAD_MUTEX_ERRORCHECK. Trying to catch if a current mdb >> process has lost is locks. (The fcntl F_SETLK is lost if the >> process closes another file descriptor to the same file, >> e.g. after some other module in the process opened and closed the >> mdb lock file.) Catching a change to the pid from getpid(). > > That's really not interesting to me. No other module has any business > opening and reading our lock file. I skipped a step there. The other module could also be using mdb. "other module" = "a program component which the module using this MDB_env does not know about". They may even be linking different libmdb.so's, so the 'libmdb's can't notify each other via static vars. There are a few other use cases like a monolith program which also can backup a directory - which the user could point at the mdb dir. Anyway, a CAVEATS section in the doc is the obvious fix. > We haven't bothered with this for alock either, and > it hasn't been a problem. Note that this ITS is about libmdb, not back-mdb. >> The fork() restriction needs to be documented, as does "don't open >> or close the same database twice in the same process". > > Go ahead. Hmm. I suggested a too pessimistic caveats section once, I can dig that up and try again.

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