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I can sometimes reproduce this with ldapsearch. But for whatever reason it's immediately reproducible with web2ldap browsing cn=Monitor.

The configuration is quite small (see slapd.conf attached).

$ strace -p $(cat run/slapd.pid) Process 6275 attached - interrupt to quit futex(0x7f6f246209d0, FUTEX_WAIT, 6276, NULL

Here's what gdb outputs attached to the blocking process.

(gdb) info threads 4 Thread 0x7f6f24620700 (LWP 6276) 0x00007f6f28b41cb3 in epoll_wait () from /lib64/libc.so.6 3 Thread 0x7f6f23e1f700 (LWP 6277) 0x00007f6f29a5f38c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 2 Thread 0x7f6f2361e700 (LWP 6285) 0x00007f6f29a61ea4 in __lll_lock_wait () from /lib64/libpthread.so.0 * 1 Thread 0x7f6f2aed9740 (LWP 6275) 0x00007f6f29a5bcb5 in pthread_join () from /lib64/libpthread.so.0 (gdb) thread apply all bt

Thread 4 (Thread 0x7f6f24620700 (LWP 6276)): #0 0x00007f6f28b41cb3 in epoll_wait () from /lib64/libc.so.6 #1 0x0000000000437751 in slapd_daemon_task (ptr=0x0) at daemon.c:2528 #2 0x00007f6f29a5aa3f in start_thread () from /lib64/libpthread.so.0 #3 0x00007f6f28b4167d in clone () from /lib64/libc.so.6 #4 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f6f23e1f700 (LWP 6277)): #0 0x00007f6f29a5f38c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0 #1 0x00007f6f2aa94f23 in ldap_pvt_thread_cond_wait (cond=0x7cc7c0, mutex=0x7cc798) at thr_posix.c:277 #2 0x00007f6f2aa93999 in ldap_int_thread_pool_wrapper (xpool=0x7cc790) at tpool.c:672 #3 0x00007f6f29a5aa3f in start_thread () from /lib64/libpthread.so.0 #4 0x00007f6f28b4167d in clone () from /lib64/libc.so.6 #5 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f6f2361e700 (LWP 6285)): #0 0x00007f6f29a61ea4 in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f6f29a5d294 in _L_lock_999 () from /lib64/libpthread.so.0 #2 0x00007f6f29a5d0aa in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x00007f6f2aa94f76 in ldap_pvt_thread_mutex_lock (mutex=0x96dcf0) at thr_posix.c:296 #4 0x00007f6f260492bf in monitor_cache_lock (e=0x88e7c8) at cache.c:117 #5 0x00007f6f2604824b in monitor_send_children (op=0x97d320, rs=0x7f6f2361da30, e_nonvolatile=0x88e728, e_ch=0x88f3a8, sub=1) at search.c:102 #6 0x00007f6f260483db in monitor_send_children (op=0x97d320, rs=0x7f6f2361da30, e_nonvolatile=0x88e1d8, e_ch=0x0, sub=1) at search.c:139 #7 0x00007f6f260488eb in monitor_back_search (op=0x97d320, rs=0x7f6f2361da30) at search.c:255 #8 0x000000000043f7fa in fe_op_search (op=0x97d320, rs=0x7f6f2361da30) at search.c:402 #9 0x000000000043f03e in do_search (op=0x97d320, rs=0x7f6f2361da30) at search.c:247 #10 0x000000000043b927 in connection_operation (ctx=0x7f6f2361db60, arg_v=0x97d320) at connection.c:1138 #11 0x000000000043bec5 in connection_read_thread (ctx=0x7f6f2361db60, argv=0xd) at connection.c:1274 #12 0x00007f6f2aa93a40 in ldap_int_thread_pool_wrapper (xpool=0x7cc790) at tpool.c:685 #13 0x00007f6f29a5aa3f in start_thread () from /lib64/libpthread.so.0 #14 0x00007f6f28b4167d in clone () from /lib64/libc.so.6 #15 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f6f2aed9740 (LWP 6275)): #0 0x00007f6f29a5bcb5 in pthread_join () from /lib64/libpthread.so.0 #1 0x00007f6f2aa94e64 in ldap_pvt_thread_join (thread=140115328501504, thread_return=0x0) at thr_posix.c:197 #2 0x00000000004388b9 in slapd_daemon () at daemon.c:2922 #3 0x0000000000416c60 in main (argc=11, argv=0x7fff0ce78fd8) at main.c:983 (gdb)

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# # See slapd.conf(5) for details on configuration options. # This file should NOT be world readable. #

# Schemata aus der OpenLDAP-Distribution include /opt/openldap-RE24/etc/openldap/schema/core.schema include /opt/openldap-RE24/etc/openldap/schema/cosine.schema include /opt/openldap-RE24/etc/openldap/schema/inetorgperson.schema

# Define global ACLs to disable default read access.

pidfile /home/michael/temp/openldap-testbed-its7053/run/slapd.pid argsfile /home/michael/temp/openldap-testbed-its7053/run/slapd.args

modulepath /opt/openldap-RE24/libexec/openldap

################################################################## # Load dynamic backend modules: ################################################################## moduleload back_hdb.la moduleload back_monitor.la

################################################################## # slapd global parameters ##################################################################

#loglevel conns filter stats threads 6 sasl-secprops minssf=0 #sasl-realm STROEDER.COM

################################################################## # Rewrite SASL identity to DIT identity ##################################################################

# EXTERNAL over Unix Domain socket authz-regexp "gidnumber=([0-9]+)\+uidnumber=([0-9]+),cn=peercred,cn=external,cn=auth" "ldap:///ou=schulung,dc=stroeder,dc=local??sub?(&(objectClass=posixAccount)(uidNumber=$2)(gidNumber=$1))"

# All mechs based on userID most times with password authz-regexp "uid=([a-zA-Z0-9]+),cn=(digest-md5|cram-md5|ntlm|plain|login|gssapi),cn=auth" "ldap:///ou=schulung,dc=stroeder,dc=local??sub?(uid=$1)"

################################################################## # Global access control ##################################################################

# Root DSE: allow anyone to read it access to dn.base="" by * read # Subschema (sub)entry DSE: allow anyone to read it access to dn.base="cn=Subschema" by * read

####################################################################### # Datenbank fuer Namensraum ou=schulung,dc=stroeder,dc=local #######################################################################

database hdb

suffix "ou=schulung,dc=stroeder,dc=local" directory /home/michael/temp/openldap-testbed-its7053/data1/bv rootdn "uid=diradm,ou=schulung,dc=stroeder,dc=local" rootpw {SSHA}t2umh2Mbf7NVLBWhJ9DeHXrwmYPt3rSs lastmod on

# Index-Konfiguration index objectClass eq

checkpoint 200 5

# Entries to cache in memory cachesize 1000 # Search results to cache in memory idlcachesize 100

sizelimit -1

# DB_CONFIG parameters dbconfig set_cachesize 0 20000000 1 dbconfig set_lg_regionmax 262144 dbconfig set_lg_bsize 262144 dbconfig set_lg_max 10485760 dbconfig set_tas_spins 0

################################################################################## # Berechtigungen im Namensraum ou=schulung,dc=stroeder,dc=local ##################################################################################

access to attrs=userPassword by group="cn=Admins,ou=Groups,ou=schulung,dc=stroeder,dc=local" =wx by group="cn=Replicas,ou=Groups,ou=schulung,dc=stroeder,dc=local" read by self =wx by * =x

access to dn.subtree="ou=schulung,dc=stroeder,dc=local" by group="cn=Admins,ou=Groups,ou=schulung,dc=stroeder,dc=local" write by group="cn=Replicas,ou=Groups,ou=schulung,dc=stroeder,dc=local" read by * None

####################################################################### # Monitor-Datenbank #######################################################################

database monitor

access to dn.subtree="cn=Monitor" by * read

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