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Re: (ITS#7710) contextCSN values not updated by internal non-replicated ops
by michael＠stroeder.com 01 Oct '13

01 Oct '13

hyc(a)symas.com wrote: >> Configuration: >> - MMR with 3 nodes and normal syncrepl. >> - slapo-memberof used to populate/update attribute 'memberOf' in user entries. >> >> If a group entry is modified and slapo-memberof updates the attribute 'memberOf' >> in the member's entry the contextCSN value of the server where the LDAP request >> was sent to is not updated on the other MMR replicas. > > I don't understand this sentence, can you rephrase? I looked into this a bit more: We have three MMR nodes, let's simply enumerate them as 1, 2 and 3. When modifying a group entry on 1 'memberOf' gets *locally* updated and the contextCSN value for server 1 gets also updated. So far so good. Now the group modification are pulled by 2 and 3 and slapo-memberof installed there *locally* updates attr memberOf and the *local* contextCSN value for 2 and 3 are updated with new timestamp. But the updated contextCSN values of 2 and 3 never get replicated to the other instances! So my monitoring check shows a long-lasting replication gap. After next server restart all contextCSN values get updated. > Also see ITS#6915. Sorry, glancing over ITS#6915 I don't understand what it means in this context. Ciao, Michael.

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Re: (ITS#7713) Segmentation fault if the pagesize of the Operating system is not equal to 4096.
by hyc＠symas.com 01 Oct '13

01 Oct '13

sumantk2(a)linux.vnet.ibm.com wrote: > Full_Name: sumanth k > Version: 2.4.35 to any recent version with mdb support > OS: Linux - ppc64 > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (122.248.161.59) > > > The pagesize of Linux for x86 and s390x architecture is 4096. Whereas in Powerpc > <ppc64> , the pagesize is by default 65536. So when the pagesize is not equal to > 4096, the segmentation fault occurs. So tried to compile the powerpc64 kernel > with page size of 4096 and the problem disappears and runs smoothly. But by > default the powerpc64 architecture runs with 65536 pagesize . So there is some > problem in mdb_env_open2() function in mdb.c when the pagesize is not equal to > 4096. Thanks for the report. I believe you should be able to instead change the definition of MDB_PAGESIZE to 65536, instead of forcing your machine to use 4096 byte pages. There are other problems though; we use an unsigned short for page offsets. I'm not sure the assert that you tripped will succeed in this case. > > These are my observations : > > > Compiled the source with -O0 optimization . > /home/openldap-2.4.36/tests/../servers/slapd/slapd -s0 -f > /home/openldap-2.4.36/tests/testrun/slapd.1.conf -h ldap://localhost:9011/ -d > 0x4105 > > ./scripts/test000-rootdse: line 31: 19059 Aborted (core dumped) > $SLAPD -f $CONF1 -h $URI1 -d $LVL $TIMING > $LOG1 2>&1 > > Core file : > bash-4.2# cat .gdbinit > b mdb_db_open > b mdb_env_open > b mdb_env_open2 > b mdb_txn_begin > b mdb_txn_renew0 > b mdb_dbi_open > b mdb_cursor_init > b mdb_cursor_set > b mdb_page_search > b mdb_page_get > b mdb_page_search_root > r -s0 -f /home/openldap-2.4.36/tests/testrun/slapd.1.conf -h > ldap://localhost:9011/ -d 0x4105 > > > # Core was generated by `/home/openldap-2.4.36/tests/../servers/slapd/slapd -s0 > -f /home/openldap-2.4.36'. > Program terminated with signal 6, Aborted. > #0 0x00001fffff7adb70 in .raise () from /lib64/libc.so.6 > Missing separate debuginfos, use: debuginfo-install > cyrus-sasl-lib-2.1.26-8.mcp8_0.2.ppc64 cyrus-sasl-md5-2.1.26-8.mcp8_0.2.ppc64 > glibc-2.17-4.mcp8_0.6.ppc64 keyutils-libs-1.5.5-4.mcp8_0.2.ppc64 > krb5-libs-1.11.3-1.mcp8_0.2.ppc64 libcom_err-1.42.7-2.mcp8_0.1.ppc64 > libdb-5.3.21-8.mcp8_0.4.ppc64 libselinux-2.1.13-15.mcp8_0.3.ppc64 > nss-softokn-freebl-3.14.3-1.mcp8_0.2.ppc64 openssl-libs-1.0.1e-4.mcp8_0.1.ppc64 > pcre-8.32-7.mcp8_0.2.ppc64 zlib-1.2.7-10.mcp8_0.1.ppc64 > (gdb) where > #0 0x00001fffff7adb70 in .raise () from /lib64/libc.so.6 > #1 0x00001fffff7afb64 in .abort () from /lib64/libc.so.6 > #2 0x00001fffff7a455c in .__assert_fail_base () from /lib64/libc.so.6 > #3 0x00001fffff7a464c in .__assert_fail () from /lib64/libc.so.6 > #4 0x00000000101498cc in mdb_node_add (mc=0x3fffe89a7d40, indx=0, > key=0x3fffe89a7d20, data=0x3fffe89a7d30, pgno=0, flags=2) at > ./../../../libraries/liblmdb/mdb.c:6160 > #5 0x000000001014882c in mdb_cursor_put (mc=0x3fffe89a7d40, key=0x3fffe89a7d20, > data=0x3fffe89a7d30, flags=2) at ./../../../libraries/liblmdb/mdb.c:5877 > #6 0x00000000101516a8 in mdb_dbi_open (txn=0x1000f675980, name=0x1027b9c8 > "ad2i", flags=262152, dbi=0x1fffff0800a0) at > ./../../../libraries/liblmdb/mdb.c:7902 > #7 0x0000000010139cd4 in mdb_db_open (be=0x1000f4f83a0, cr=0x3fffe89a81c0) at > init.c:207 > #8 0x0000000010050e34 in backend_startup_one (be=0x1000f4f83a0, > cr=0x3fffe89a81c0) at backend.c:224 > #9 0x0000000010051588 in backend_startup (be=0x1000f4f83a0) at backend.c:325 > #10 0x0000000010089a7c in slap_startup (be=0x0) at init.c:219 > #11 0x000000001000a9c8 in main (argc=8, argv=0x3fffe89a8958) at main.c:991 > > > > Here is the error message : > > #/home/openldap-2.4.36/tests/../servers/slapd/slapd -s0 -f > /home/openldap-2.4.36/tests/testrun/slapd.1.conf -h ldap://localhost:9011/ -d > 0x4105 > (...some messages...) > 524a2fe1 mdb_db_open: database "o=OpenLDAP Project,l=Internet": > dbenv_open(/home/openldap-2.4.36/tests/testrun/db.1.a). > slapd: ./../../../libraries/liblmdb/mdb.c:6160: mdb_node_add: Assertion > `mp->mp_pb.pb.pb_upper >= mp->mp_pb.pb.pb_lower' failed. < === fails in assert() > ; > Aborted (core dumped) > > > > Some of my observation : > > in this file libraries/liblmdb/mdb.c > in X86 : rc = mdb_cursor_set(&mc, &key, &data, MDB_SET, &exact); the value of > rc = MD_SUCCESS, but for ppc64 it is MDB_NOTFOUND. This is due to the fact that > md_root != 2 > > The value of md_root=2 for env->me_metas[1]->mm_dbs in X86 , but some huge value > in ppc64. The value of md_pad = 4096 in x86 and 65536 in ppc64 . > > in x86: > > Breakpoint 2, mdb_txn_begin (env=0x9c5050, parent=0x0, flags=0, > ret=0x7fffffffdf98) at ./../../../libraries/liblmdb/mdb.c:2219 > 2219 int rc, size, tsize = sizeof(MDB_txn); > (gdb) p env->me_metas[1]->mm_dbs > $1 = {{md_pad = 4096, md_flags = 8, md_depth = 0, md_branch_pages = 0, > md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = > 18446744073709551615}, {md_pad = 0, md_flags = 0, > md_depth = 1, md_branch_pages = 0, md_leaf_pages = 1, md_overflow_pages = 0, > md_entries = 4, md_root = 2}} > (gdb) p env->me_metas[0]->mm_dbs > $2 = {{md_pad = 4096, md_flags = 8, md_depth = 0, md_branch_pages = 0, > md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = > 18446744073709551615}, {md_pad = 0, md_flags = 0, > md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, > md_entries = 0, md_root = 18446744073709551615}} > > > in ppc64: > > Breakpoint 2, mdb_txn_begin (env=0x10493ef0, parent=0x0, flags=0, > ret=0x3fffffffe590) at ./../../../libraries/liblmdb/mdb.c:2219 > 2219 int rc, size, tsize = sizeof(MDB_txn); > (gdb) p env->me_metas[0]->mm_dbs > $1 = {{md_pad = 65536, md_flags = 8, md_depth = 0, md_branch_pages = 0, > md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = > 18446744073709551615}, {md_pad = 0, md_flags = 0, > md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, > md_entries = 0, md_root = 18446744073709551615}} > (gdb) p env->me_metas[1]->mm_dbs > $2 = {{md_pad = 65536, md_flags = 8, md_depth = 0, md_branch_pages = 0, > md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = > 18446744073709551615}, {md_pad = 0, md_flags = 0, > md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, > md_entries = 0, md_root = 18446744073709551615}} > > > > > # From further investigation , the value of env->me_metas[1] is initialized in > mdb_env_open2() at : > > p = (MDB_page *)env->me_map; > env->me_metas[0] = METADATA(p); > env->me_metas[1] = (MDB_meta *)((char *)env->me_metas[0] + meta.mm_psize); > > Here the meta.mm_psize in ppc64 is 65536 , hence there is some problem.. If the > value of meta.mm_psize is 4096 , then everything works fine. > > > As i dont have deep knowledge in openldap ,some help is needed. > > Thank you, > Sumanth K > > -- -- 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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(ITS#7713) Segmentation fault if the pagesize of the Operating system is not equal to 4096.
by sumantk2＠linux.vnet.ibm.com 30 Sep '13

30 Sep '13

Full_Name: sumanth k Version: 2.4.35 to any recent version with mdb support OS: Linux - ppc64 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (122.248.161.59) The pagesize of Linux for x86 and s390x architecture is 4096. Whereas in Powerpc <ppc64> , the pagesize is by default 65536. So when the pagesize is not equal to 4096, the segmentation fault occurs. So tried to compile the powerpc64 kernel with page size of 4096 and the problem disappears and runs smoothly. But by default the powerpc64 architecture runs with 65536 pagesize . So there is some problem in mdb_env_open2() function in mdb.c when the pagesize is not equal to 4096. These are my observations : Compiled the source with -O0 optimization . /home/openldap-2.4.36/tests/../servers/slapd/slapd -s0 -f /home/openldap-2.4.36/tests/testrun/slapd.1.conf -h ldap://localhost:9011/ -d 0x4105 ./scripts/test000-rootdse: line 31: 19059 Aborted (core dumped) $SLAPD -f $CONF1 -h $URI1 -d $LVL $TIMING > $LOG1 2>&1 Core file : bash-4.2# cat .gdbinit b mdb_db_open b mdb_env_open b mdb_env_open2 b mdb_txn_begin b mdb_txn_renew0 b mdb_dbi_open b mdb_cursor_init b mdb_cursor_set b mdb_page_search b mdb_page_get b mdb_page_search_root r -s0 -f /home/openldap-2.4.36/tests/testrun/slapd.1.conf -h ldap://localhost:9011/ -d 0x4105 # Core was generated by `/home/openldap-2.4.36/tests/../servers/slapd/slapd -s0 -f /home/openldap-2.4.36'. Program terminated with signal 6, Aborted. #0 0x00001fffff7adb70 in .raise () from /lib64/libc.so.6 Missing separate debuginfos, use: debuginfo-install cyrus-sasl-lib-2.1.26-8.mcp8_0.2.ppc64 cyrus-sasl-md5-2.1.26-8.mcp8_0.2.ppc64 glibc-2.17-4.mcp8_0.6.ppc64 keyutils-libs-1.5.5-4.mcp8_0.2.ppc64 krb5-libs-1.11.3-1.mcp8_0.2.ppc64 libcom_err-1.42.7-2.mcp8_0.1.ppc64 libdb-5.3.21-8.mcp8_0.4.ppc64 libselinux-2.1.13-15.mcp8_0.3.ppc64 nss-softokn-freebl-3.14.3-1.mcp8_0.2.ppc64 openssl-libs-1.0.1e-4.mcp8_0.1.ppc64 pcre-8.32-7.mcp8_0.2.ppc64 zlib-1.2.7-10.mcp8_0.1.ppc64 (gdb) where #0 0x00001fffff7adb70 in .raise () from /lib64/libc.so.6 #1 0x00001fffff7afb64 in .abort () from /lib64/libc.so.6 #2 0x00001fffff7a455c in .__assert_fail_base () from /lib64/libc.so.6 #3 0x00001fffff7a464c in .__assert_fail () from /lib64/libc.so.6 #4 0x00000000101498cc in mdb_node_add (mc=0x3fffe89a7d40, indx=0, key=0x3fffe89a7d20, data=0x3fffe89a7d30, pgno=0, flags=2) at ./../../../libraries/liblmdb/mdb.c:6160 #5 0x000000001014882c in mdb_cursor_put (mc=0x3fffe89a7d40, key=0x3fffe89a7d20, data=0x3fffe89a7d30, flags=2) at ./../../../libraries/liblmdb/mdb.c:5877 #6 0x00000000101516a8 in mdb_dbi_open (txn=0x1000f675980, name=0x1027b9c8 "ad2i", flags=262152, dbi=0x1fffff0800a0) at ./../../../libraries/liblmdb/mdb.c:7902 #7 0x0000000010139cd4 in mdb_db_open (be=0x1000f4f83a0, cr=0x3fffe89a81c0) at init.c:207 #8 0x0000000010050e34 in backend_startup_one (be=0x1000f4f83a0, cr=0x3fffe89a81c0) at backend.c:224 #9 0x0000000010051588 in backend_startup (be=0x1000f4f83a0) at backend.c:325 #10 0x0000000010089a7c in slap_startup (be=0x0) at init.c:219 #11 0x000000001000a9c8 in main (argc=8, argv=0x3fffe89a8958) at main.c:991 Here is the error message : #/home/openldap-2.4.36/tests/../servers/slapd/slapd -s0 -f /home/openldap-2.4.36/tests/testrun/slapd.1.conf -h ldap://localhost:9011/ -d 0x4105 (...some messages...) 524a2fe1 mdb_db_open: database "o=OpenLDAP Project,l=Internet": dbenv_open(/home/openldap-2.4.36/tests/testrun/db.1.a). slapd: ./../../../libraries/liblmdb/mdb.c:6160: mdb_node_add: Assertion `mp->mp_pb.pb.pb_upper >= mp->mp_pb.pb.pb_lower' failed. < === fails in assert() ; Aborted (core dumped) Some of my observation : in this file libraries/liblmdb/mdb.c in X86 : rc = mdb_cursor_set(&mc, &key, &data, MDB_SET, &exact); the value of rc = MD_SUCCESS, but for ppc64 it is MDB_NOTFOUND. This is due to the fact that md_root != 2 The value of md_root=2 for env->me_metas[1]->mm_dbs in X86 , but some huge value in ppc64. The value of md_pad = 4096 in x86 and 65536 in ppc64 . in x86: Breakpoint 2, mdb_txn_begin (env=0x9c5050, parent=0x0, flags=0, ret=0x7fffffffdf98) at ./../../../libraries/liblmdb/mdb.c:2219 2219 int rc, size, tsize = sizeof(MDB_txn); (gdb) p env->me_metas[1]->mm_dbs $1 = {{md_pad = 4096, md_flags = 8, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}, {md_pad = 0, md_flags = 0, md_depth = 1, md_branch_pages = 0, md_leaf_pages = 1, md_overflow_pages = 0, md_entries = 4, md_root = 2}} (gdb) p env->me_metas[0]->mm_dbs $2 = {{md_pad = 4096, md_flags = 8, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}, {md_pad = 0, md_flags = 0, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}} in ppc64: Breakpoint 2, mdb_txn_begin (env=0x10493ef0, parent=0x0, flags=0, ret=0x3fffffffe590) at ./../../../libraries/liblmdb/mdb.c:2219 2219 int rc, size, tsize = sizeof(MDB_txn); (gdb) p env->me_metas[0]->mm_dbs $1 = {{md_pad = 65536, md_flags = 8, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}, {md_pad = 0, md_flags = 0, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}} (gdb) p env->me_metas[1]->mm_dbs $2 = {{md_pad = 65536, md_flags = 8, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}, {md_pad = 0, md_flags = 0, md_depth = 0, md_branch_pages = 0, md_leaf_pages = 0, md_overflow_pages = 0, md_entries = 0, md_root = 18446744073709551615}} # From further investigation , the value of env->me_metas[1] is initialized in mdb_env_open2() at : p = (MDB_page *)env->me_map; env->me_metas[0] = METADATA(p); env->me_metas[1] = (MDB_meta *)((char *)env->me_metas[0] + meta.mm_psize); Here the meta.mm_psize in ppc64 is 65536 , hence there is some problem.. If the value of meta.mm_psize is 4096 , then everything works fine. As i dont have deep knowledge in openldap ,some help is needed. Thank you, Sumanth K

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Re: (ITS#7710) contextCSN values not updated by internal non-replicated ops
by hyc＠symas.com 30 Sep '13

30 Sep '13

michael(a)stroeder.com wrote: > Full_Name: > Version: 2.4.36 > OS: > URL: > Submission from: (NULL) (2001:8d8:1fe:7:d6be:d9ff:fe09:1b7c) > > > Configuration: > - MMR with 3 nodes and normal syncrepl. > - slapo-memberof used to populate/update attribute 'memberOf' in user entries. > > If a group entry is modified and slapo-memberof updates the attribute 'memberOf' > in the member's entry the contextCSN value of the server where the LDAP request > was sent to is not updated on the other MMR replicas. I don't understand this sentence, can you rephrase? Also see ITS#6915. > > All changes are correctly done though. > > After restart contextCSN values are all the same on all MMR replicas. > > -- -- 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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(ITS#7712) Lock ordering problem in libldap/abandon.c
by ebackes＠symas.com 30 Sep '13

30 Sep '13

Full_Name: Emily Backes Version: RE24/HEAD OS: any URL: Submission from: (NULL) (98.155.30.248) libldap has a lock ordering problem in do_abandon in libldap/abandon.c; do_abandon always runs in locked req_mutex context, but one of the cases acquires conn_mutex for the ldap_free_connection() call. The function is always called with that mutex held, but has several non-local exits and other difficulties with refactoring the problem away, so the clearest solutions seems to be dropping and retrieving the req_mutex while messing with the conn_mutex. Patch incoming.

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Re: (ITS#7711) Cannot include the radius.schema
by quanah＠zimbra.com 27 Sep '13

27 Sep '13

--On Friday, September 27, 2013 8:02 AM +0000 psam1219(a)hotmail.com wrote: > Full_Name: Don > Version: slapd 2.4.23 > OS: RHEL 6.3 x64 > URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (58.213.47.66) The ITS system is for reporting bugs. It is not for asking questions about how to use the software. Usage questions should be asked via the openldap-technical(a)openldap.org mailing list. This ITS will be closed. --Quanah -- Quanah Gibson-Mount Lead Engineer Zimbra Software, LLC -------------------- Zimbra :: the leader in open source messaging and collaboration

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(ITS#7711) Cannot include the radius.schema
by psam1219＠hotmail.com 27 Sep '13

27 Sep '13

Full_Name: Don Version: slapd 2.4.23 OS: RHEL 6.3 x64 URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (58.213.47.66) There is a slapd server ,and there is a freeradius server . I was following these steps . A.Copy example schema file (openldap.schema)from freeradius server. scp RADIUSSERVER:/usr/share/doc/freeradius-2.1.12/examples/openldap.schema ./freeradius.schema B.Include the file to slapd.conf . include /etc/openldap/schema/freeradius.schema C.restart slapd server service slapd restart D.When I tried to add the ldif file to create entries , this error come out . [root@RAC1 test]# ldapadd -f test.ldif -x -D "cn=Manager,dc=txldomain,dc=com" -w taxili888 adding new entry "cn=students,ou=profiles,ou=radius,dc=txldomain,dc=com" ldap_add: Invalid syntax (21) additional info: objectclass: value #0 invalid per syntax E.Then I checked the ObjectClasses from a Web UI £šphpLDAPadmin£©, I cann't see radiusprofile on the list table . I think the problem is failure of adding radius's scheme ,but I don't know why and how to solve this . Thank you for your time to check this issue .

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(ITS#7710) contextCSN values not updated by internal non-replicated ops
by michael＠stroeder.com 26 Sep '13

26 Sep '13

Full_Name: Version: 2.4.36 OS: URL: Submission from: (NULL) (2001:8d8:1fe:7:d6be:d9ff:fe09:1b7c) Configuration: - MMR with 3 nodes and normal syncrepl. - slapo-memberof used to populate/update attribute 'memberOf' in user entries. If a group entry is modified and slapo-memberof updates the attribute 'memberOf' in the member's entry the contextCSN value of the server where the LDAP request was sent to is not updated on the other MMR replicas. All changes are correctly done though. After restart contextCSN values are all the same on all MMR replicas.

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Re: (ITS#7709) mdb back-end segfaults sporadically with paged searches
by quanah＠zimbra.com 24 Sep '13

24 Sep '13

--On Tuesday, September 24, 2013 8:25 PM +0000 openldap(a)semyon.org wrote: > Full_Name: Semyon Chaichenets > Version: 2.4.36 > OS: Linux 3.2.0-51-generic #77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 > x86_64 x86_64 x86_64 GNU/Linux URL: ftp://ftp.openldap.org/incoming/ > Submission from: (NULL) (129.128.11.113) Please stop repeatedly creating new ITSes for your issue. This is the 3rd one you've created. Thanks. --Quanah -- Quanah Gibson-Mount Lead Engineer Zimbra Software, LLC -------------------- Zimbra :: the leader in open source messaging and collaboration

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(ITS#7709) mdb back-end segfaults sporadically with paged searches
by openldap＠semyon.org 24 Sep '13

24 Sep '13

Full_Name: Semyon Chaichenets Version: 2.4.36 OS: Linux 3.2.0-51-generic #77-Ubuntu SMP Wed Jul 24 20:18:19 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (129.128.11.113) We have an issue whereby a paged-search operation causes slapd to segfault. At this point, I can only reproduce the issue on our production data - for which I cannot share coredumps. I am working on isolating the issue but would appreciate any help from openLDAP developers. The issue is triggered by the following search: ldapsearch -H ldap://ldaphost -b 'ou=people,dc=our,dc=org' -x -E pr=126/noprompt '(uid=m*)' We have ~59k entries starting matching uid=m*; the issue occurs unpredictably in the sense that it may or may not happen for filters matching other sets, but it can be reproduced reliably for any given filter/page size combination. On our setup, I could reproduce it for page-sizes 81,84,87,96,112,114,116,126. The issue is specific to back-mdb; backtrace points to dn2id.c: #0 0x00007f6d6a5ea6a1 in mdb_idscopes (op=0x7f695c110df0, isc=0x7f69692ca670) at ../../../../../servers/slapd/back-mdb/dn2id.c:738 #1 0x00007f6d6a5e399b in mdb_search (op=0x7f695c110df0, rs=0x7f69692dba00) at ../../../../../servers/slapd/back-mdb/search.c:747 [..] I would greatly appreciate any help you could give me with this problem. Best, Semyon

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