A slapd hangs up when many entries information were modified on RHEL5

Solution Verified - Updated -


  • slapd hangs after being restarted while an operation modifying many entries is being run. The slapd's core file captured by gcore command says as follows:

    • A worker-thread is waiting for mutex.
    • A thread that locked the mutex is already gone.
  • This happens when:

    • slapd exits without cleaning up the mutex, so the backend DB is in a dirty state.
    • Admin runs slaptest or slapcat.
    • service ldap start
  • This issue does not manifest if slaptest or slapcat is not run.


  • Red Hat Enterprise Linux 5: RHEL5.1 and later
  • Architecture: x86_64
  • Kernel Version: 2.6.18-53.el5
  • Related Package Version: openldap-servers-2.3.43-12.el5_6.7 and later
  • glibc-2.5-18 and later

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