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[Bug 1926265] [NEW] slapd enter in infinite loop on sched_yield syscall

 

Public bug reported:

On a production server, sometimes slapd become unbresponsive, some threads loops in sched_yield syscall and consumme all CPU.
To recover, slapd needs to restart.
No related information is reported in log file.
All same issues in OpenLDAP upstream project are old and fixed.
So maybe this issue affects only Ubuntu package.
It occurs randomly, so I have no steps to reproduce.


OS : Bionic

Openldap version:

libldap-2.4-2:amd64                    2.4.45+dfsg-1ubuntu1.10                         
libldap-common                         2.4.45+dfsg-1ubuntu1.10                         
slapd                                  2.4.45+dfsg-1ubuntu1.10                         

Modules loaded:

olcModuleLoad: {0}back_bdb
olcModuleLoad: {1}syncprov
olcModuleLoad: {2}back_monitor
olcModuleLoad: {3}memberof.la
olcModuleLoad: {4}refint.la
olcModuleLoad: {5}rwm
olcModuleload: {6}back_ldap


Backend is BDB. slapd run in (single) master - (multi) slave mode.

** Affects: openldap (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1926265

Title:
  slapd enter in infinite loop on sched_yield syscall

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