openldap-bugs

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(ITS#7718) mdb_cursor_del() segfault on last entry
by matthew.monaco＠colorado.edu 08 Oct '13

08 Oct '13

Full_Name: Matthew Monaco Version: mdb-0.9.8, mdb-d327a36 OS: linux-3.11.4 URL: http://pastie.org/8385142 Submission from: (NULL) (128.138.64.206) I'm getting a segfault with MDB when using mdb_cursor_del() on the last entry in the database. Example on pastie.org [1]. [1] http://pastie.org/8385142

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Re: (ITS#7717) Sudden memory increase leading to Master LDAP crash
by quanah＠zimbra.com 08 Oct '13

08 Oct '13

--On Thursday, October 03, 2013 1:14 PM +0000 marcon.bruno(a)free.fr wrote: > The problem is very easy to replay : one master and one slave are > sufficient. Then run 9 windows with a script adding an entry and > modifying an entry. Please provide full configuration details. --Quanah -- Quanah Gibson-Mount Architect - Server Zimbra Software, LLC -------------------- Zimbra :: the leader in open source messaging and collaboration

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Re: (ITS#7710) contextCSN values not updated by internal non-replicated ops
by ck＠cksoft.de 08 Oct '13

08 Oct '13

Hi Michael, On Sun, 6 Oct 2013, michael(a)stroeder.com wrote: > I've updated the test data with LDIF files and a README describing the LDAP > operations to perform: > > http://www.stroeder.com/temp/openldap-testbed-its7710.tar.bz2 > > I consider this to be a serious issue which could be the cause for other > replication issues including dead-locks we're experiencing. (Maybe there are > similar issues in slapo-refint since dead-locks in our deployment arised when > moving entries into different subtree.) I can confirm that I can see the same bug with your testcase. It seems that restarting the second slapd instance fixes the contextCSN issue just because it scans all it's entries and does the right thing. Even a slapcat of both directories shows the issue. Things that I find disturbing: After applying the group membership the member dn: gets it's memberOf attribute updated accordingly. But the entryCSN stays unchanged. Entry before applying group membership: # michael, users, example.com dn: uid=michael,ou=users,dc=example,dc=com uid: michael objectClass: account objectClass: simpleSecurityObject userPassword:: dGVzdHNlY3JldA== description: test entryCSN: 20131006193757.912740Z#000000#002#000000 Entry after applying group membership is obviously updated but still has the same entryCSN: # michael, users, example.com dn: uid=michael,ou=users,dc=example,dc=com uid: michael objectClass: account objectClass: simpleSecurityObject userPassword:: dGVzdHNlY3JldA== memberOf: cn=admins,ou=groups,dc=example,dc=com memberOf: cn=testgroup1,ou=groups,dc=example,dc=com description: test entryCSN: 20131006193757.912740Z#000000#002#000000 I can also confirm the subsequent contextCSN mismatch. I too consider this a serious issue. If I read Howards reply correctly and from what I see in the source code of the memberOf overlay the strategy here seems to be not to replicate the side effect of adding the memberOf: entry. OpenLDAP relies on the side effect happening on the replicas through the same codepath when the member: attribute in the group gets updated through replication. This sounds very similar to the difference between: 1. statement replication in sql databases ala mysql 2. log based replication ala postgresql OpenLDAP is doing 1. here while 2. would perhaps have been the better option. I understand turning this around is propably too late at this point in time. Looks like we will just have to work out the bugs the hard way. I am using slapo-lastbind and slapo-ppolicy extensively in my current project and will keep my eyes open for similar issues resulting from not replicating the side effects that these overlays produce. Greetings Christian -- Christian Kratzer CK Software GmbH Email: ck(a)cksoft.de Wildberger Weg 24/2 Phone: +49 7032 893 997 - 0 D-71126 Gaeufelden Fax: +49 7032 893 997 - 9 HRB 245288, Amtsgericht Stuttgart Web: http://www.cksoft.de/ Geschaeftsfuehrer: Christian Kratzer

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Re: (ITS#7710) contextCSN values not updated by internal non-replicated ops
by michael＠stroeder.com 07 Oct '13

07 Oct '13

Christian Kratzer wrote: > This sounds very similar to the difference between: > > 1. statement replication in sql databases ala mysql > > 2. log based replication ala postgresql > > OpenLDAP is doing 1. here while 2. would perhaps have been the better option. >From my understanding 2. is OpenLDAP's delta-syncrepl. Ciao, Michael.

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Re: (ITS#7716) slapd crashes after search immediately followed by (abandon+) unbind
by quanah＠zimbra.com 07 Oct '13

07 Oct '13

--On Wednesday, October 02, 2013 12:32 PM +0000 michael.vishchers(a)7p-group.com wrote: > Full_Name: Michael Vishchers > Version: 2.4.23 This release is years old, and has numerous known issues. It sounds like you are using RedHat's package. If you absolutely have to use that package, then you need to report this issue with RedHat. Otherwise, I suggest upgrading to the latest release. If you don't feel comfortable building OpenLDAP yourself, you can easily use the packages from the LTB project: <http://ltb-project.org/wiki/download#openldap> This ITS will be closed. Regards, Quanah -- Quanah Gibson-Mount Architect - Server Zimbra Software, LLC -------------------- Zimbra :: the leader in open source messaging and collaboration

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Re: (ITS#7710) contextCSN values not updated by internal non-replicated ops
by michael＠stroeder.com 06 Oct '13

06 Oct '13

I've updated the test data with LDIF files and a README describing the LDAP operations to perform: http://www.stroeder.com/temp/openldap-testbed-its7710.tar.bz2 I consider this to be a serious issue which could be the cause for other replication issues including dead-locks we're experiencing. (Maybe there are similar issues in slapo-refint since dead-locks in our deployment arised when moving entries into different subtree.) Ciao, Michael. The README copied here for direct access: ---------------------------------------------------------------------------- 0. Start both servers by invoking start-slapd1.sh and start-slapd2.sh ---------------------------------------------------------------------------- 1. Add test entries on first server: $ ldapadd -H ldap://localhost:2071 -D "uid=diradm,dc=example,dc=com" -w testsecret -f 1_ldapadd.ldif adding new entry "dc=example,dc=com" [..] adding new entry "cn=replicas,ou=groups,dc=example,dc=com" You can now see contextCSN value of first server on both servers (as expected): $ for I in 1 2 ; do (echo ldap://localhost:207$I ; ldapsearch -LLL -H ldap://localhost:207$I -D "uid=diradm,dc=example,dc=com" -w testsecret -b "dc=example,dc=com" -s base "(objectClass=*)" contextCSN ) ; done ldap://localhost:2071 dn: dc=example,dc=com contextCSN: 20131006154300.921415Z#000000#001#000000 ldap://localhost:2072 dn: dc=example,dc=com contextCSN: 20131006154300.921415Z#000000#001#000000 ---------------------------------------------------------------------------- 2. Send a simple modification to second server: $ ldapmodify -H ldap://localhost:2072 -D "uid=diradm,dc=example,dc=com" -w testsecret -f 2_ldapmodify.ldif modifying entry "uid=michael,ou=users,dc=example,dc=com" You can now see contextCSN value of second server on both servers (as expected): $ for I in 1 2 ; do (echo ldap://localhost:207$I ; ldapsearch -LLL -H ldap://localhost:207$I -D "uid=diradm,dc=example,dc=com" -w testsecret -b "dc=example,dc=com" -s base "(objectClass=*)" contextCSN ) ; done ldap://localhost:2071 dn: dc=example,dc=com contextCSN: 20131006154300.921415Z#000000#001#000000 contextCSN: 20131006154406.940154Z#000000#002#000000 ldap://localhost:2072 dn: dc=example,dc=com contextCSN: 20131006154300.921415Z#000000#001#000000 contextCSN: 20131006154406.940154Z#000000#002#000000 ---------------------------------------------------------------------------- 3. Modification of group membership on first server: $ ldapmodify -H ldap://localhost:2071 -D "uid=diradm,dc=example,dc=com" -w testsecret -f 3_ldapmodify.ldif modifying entry "cn=testgroup1,ou=groups,dc=example,dc=com" Now the contextCSN values differ: $ for I in 1 2 ; do (echo ldap://localhost:207$I ; ldapsearch -LLL -H ldap://localhost:207$I -D "uid=diradm,dc=example,dc=com" -w testsecret -b "dc=example,dc=com" -s base "(objectClass=*)" contextCSN ) ; done ldap://localhost:2071 dn: dc=example,dc=com contextCSN: 20131006154449.514135Z#000000#001#000000 contextCSN: 20131006154406.940154Z#000000#002#000000 ldap://localhost:2072 dn: dc=example,dc=com contextCSN: 20131006154300.921415Z#000000#001#000000 contextCSN: 20131006154406.940154Z#000000#002#000000

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Re: (ITS#7710) contextCSN values not updated by internal non-replicated ops
by michael＠stroeder.com 04 Oct '13

04 Oct '13

Hmmpf, the attachment did not come through. Download config here: http://www.stroeder.com/temp/openldap-testbed-its7710.tar.bz2

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(ITS#7710) contextCSN values not updated by internal non-replicated ops
by michael＠stroeder.com 04 Oct '13

04 Oct '13

----==62f1203288d98ad3817191f9b713342b Content-Type: text/plain; charset=UTF-8; format=fixed Content-Transfer-Encoding: 8bit See attached a canned MMR config. The behaviour regarding contextCSN is really strange. You have to play around with some more modify requests changing the group membership of e.g. uid=michael,ou=users,dc=example,dc=com If contextCSN values are out-of-sync restarting one slapd brings them up to same values again, but the older(!) ones. 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Re: (ITS#7715) SIGBUS when mdb is configured with writemap
by hyc＠symas.com 04 Oct '13

04 Oct '13

Howard Chu wrote: > Željko Nejašmić wrote: >> On Fri, Oct 4, 2013 at 10:26 AM, <hyc(a)symas.com> wrote: >>> >>> Thanks. So far the output shows nothing out of the ordinary. Can you also >>> provide the output for: >>> ls -l /opt/openldap/var/openldap-data >> >> root@spr101:~ $ ls -ahl /opt/openldap/var/openldap-data >> total 100K >> drwxr-xr-x. 2 openldap openldap 4.0K Oct 4 07:54 . >> drwxr-xr-x. 4 openldap openldap 4.0K May 28 08:49 .. >> -rw-------. 1 openldap openldap 88K Oct 4 07:44 data.mdb >> -rw-------. 1 openldap openldap 8.0K Oct 4 07:54 lock.mdb > > Something is flaky with your installation. As I wrote in my previous email, > LMDB always sets the file size to match your mapsize, to avoid this SIGBUS > issue. Your mapsize is 38654705664 (36GB) but the data.mdb filesize is only > 88K, it should be 36GB. You must have some other process running that is > truncating the file; there is nothing in OpenLDAP's code that would cause this > behavior. I take this back, this is a bug introduced in liblmdb 0.9.8; it is only setting the filesize on a newly created DB. If you had an existing DB and added writemap to your configuration after the fact, the DB size wasn't getting set. The fix is simple, and is now in git branch mdb.master. > >> root@spr101:~ $ ps -efa | grep slapd >> openldap 44012 1 0 07:54 ? 00:00:01 >> /opt/openldap/libexec/slapd -h ldap:/// ldapi:/// -F >> /opt/openldap/etc/openldap/slapd.d -g openldap -u openldap >> >> root@spr101:~ $ mount | grep sdb1 >> /dev/sdb1 on /opt type ext4 (rw,noatime,nobarrier,data=ordered) >> Do note that we did load testing on ext2 and ext4, with both being >> tweaked and not, and as far as I recall, every combination of >> parameters causes the problem; I will try to reproduce it on >> ext{2,3,4} with default mounting parameters. Almost forgot, we did >> tests using tmpfs also, with the same outcome. The whole /opt was used >> as a mount point for the tmpfs. >> >> root@spr101:~ $ fdisk -lu /dev/sdb1 >> Disk /dev/sdb1: 400.0 GB, 400027127808 bytes >> 224 heads, 56 sectors/track, 62284 cylinders, total 781302984 sectors >> Units = sectors of 1 * 512 = 512 bytes >> Sector size (logical/physical): 512 bytes / 512 bytes >> I/O size (minimum/optimal): 512 bytes / 512 bytes >> Disk identifier: 0x00000000 >> >> gparted doesn't seem to be complaining about SSD block alignment: >> root@spr101:~ $ parted /dev/sdb1 align-check opt 1 >> >> Another thing I'll be trying is making a partition with different >> alignment parameters to see if any change occurs; tried using a >> different scheme, but that hasn't produced a a change in behavior. >> >>> >>> Note from the mmap(2) manpage: >>> >>> Use of a mapped region can result in these signals: >>> >>> SIGSEGV >>> Attempted write into a region mapped as read-only. >>> >>> SIGBUS Attempted access to a portion of the buffer that does not >>> correspond to the file (for example, beyond >>> the end of the file, including the case where another process >>> has truncated the file). >>> >>> LMDB always sets the size of the file when using the WRITEMAP option, so the >>> SIGBUS condition should never happen. The pointers in your gdb output are all >>> within the bounds of the map and mapsize you configured. >>> >>> What filesystem type is the data directory stored on? This is looking more >>> like a kernel or filesystem bug than anything else. >>> -- -- 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#7715) SIGBUS when mdb is configured with writemap
by hyc＠symas.com 04 Oct '13

04 Oct '13

Željko Nejašmić wrote: > On Fri, Oct 4, 2013 at 10:26 AM, <hyc(a)symas.com> wrote: >> >> Thanks. So far the output shows nothing out of the ordinary. Can you also >> provide the output for: >> ls -l /opt/openldap/var/openldap-data > > root@spr101:~ $ ls -ahl /opt/openldap/var/openldap-data > total 100K > drwxr-xr-x. 2 openldap openldap 4.0K Oct 4 07:54 . > drwxr-xr-x. 4 openldap openldap 4.0K May 28 08:49 .. > -rw-------. 1 openldap openldap 88K Oct 4 07:44 data.mdb > -rw-------. 1 openldap openldap 8.0K Oct 4 07:54 lock.mdb Something is flaky with your installation. As I wrote in my previous email, LMDB always sets the file size to match your mapsize, to avoid this SIGBUS issue. Your mapsize is 38654705664 (36GB) but the data.mdb filesize is only 88K, it should be 36GB. You must have some other process running that is truncating the file; there is nothing in OpenLDAP's code that would cause this behavior. > root@spr101:~ $ ps -efa | grep slapd > openldap 44012 1 0 07:54 ? 00:00:01 > /opt/openldap/libexec/slapd -h ldap:/// ldapi:/// -F > /opt/openldap/etc/openldap/slapd.d -g openldap -u openldap > > root@spr101:~ $ mount | grep sdb1 > /dev/sdb1 on /opt type ext4 (rw,noatime,nobarrier,data=ordered) > Do note that we did load testing on ext2 and ext4, with both being > tweaked and not, and as far as I recall, every combination of > parameters causes the problem; I will try to reproduce it on > ext{2,3,4} with default mounting parameters. Almost forgot, we did > tests using tmpfs also, with the same outcome. The whole /opt was used > as a mount point for the tmpfs. > > root@spr101:~ $ fdisk -lu /dev/sdb1 > Disk /dev/sdb1: 400.0 GB, 400027127808 bytes > 224 heads, 56 sectors/track, 62284 cylinders, total 781302984 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > gparted doesn't seem to be complaining about SSD block alignment: > root@spr101:~ $ parted /dev/sdb1 align-check opt 1 > > Another thing I'll be trying is making a partition with different > alignment parameters to see if any change occurs; tried using a > different scheme, but that hasn't produced a a change in behavior. > >> >> Note from the mmap(2) manpage: >> >> Use of a mapped region can result in these signals: >> >> SIGSEGV >> Attempted write into a region mapped as read-only. >> >> SIGBUS Attempted access to a portion of the buffer that does not >> correspond to the file (for example, beyond >> the end of the file, including the case where another process >> has truncated the file). >> >> LMDB always sets the size of the file when using the WRITEMAP option, so the >> SIGBUS condition should never happen. The pointers in your gdb output are all >> within the bounds of the map and mapsize you configured. >> >> What filesystem type is the data directory stored on? This is looking more >> like a kernel or filesystem bug than anything else. >> >> -- >> -- Howard Chu >> CTO, Symas Corp. http://www.symas.com >> Director, Highland Sun http://highlandsun.com/hyc/ >> Chief Architect, OpenLDAP http://www.openldap.org/project/ > -- -- 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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