My bad..
You're right, in my test, the second write() is performed on stdout cause my 
ldapsearch command is wrong. I missed  the '-H' arg to properly set the LDAP 
URI (but you too :-p ).
Consequently, the connection was in LDAP not LDAPS, and "ldaps://..." was the 
requested attributs :-s

So since I learnt to make a good ldapsearch and opened my eyes to read gdb 
output, I can fully reproducible the issue .
Thanks.

I'll test the patched version on my test machine.

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Touch seeded packages, which is subscribed to openldap in Ubuntu.
https://bugs.launchpad.net/bugs/1926265

Title:
  slapd enter in infinite loop on sched_yield syscall

Status in openldap package in Ubuntu:
  Confirmed

Bug description:
  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.

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