Full_Name: zvika ferentz Version: 2.4.31 (deb7u2) OS: Debian Wheezy URL: ftp://ftp.openldap.org/incoming/ Submission from: (NULL) (65.51.117.60)

Greetings,

I've noticed that sometimes the "slapd" fails to stop. I can reproduce the problem only on machines with multiple cores (more than 2) when there are many concurrent connections and the server is under a heavy "stress" .

note that this is a debian wheezy x64 so probably it's not the standard vanilla slapd , however from the logs&source it doesn't look like it's related to the OS.

In the logs i was able to identify the first "shutdown" log: daemon: shutdown requested and initiated However the next expected shutdown logs are missing ("waiting for ... operations/tasks to finish" and "slapd stopped") . Hence i believe that it's related to closing the sockets/listeners (this is my guess based on the source code, however i never debugged/proved it). Please note that i'm using virtual environment so i was able to reproduce it only when i used more than 4 cores.

How to reproduced it: --------------------- - Open two terminals. - On terminal #1 i'm just manually running "slapd restart" commands: # /etc/init.d/slapd status ; /etc/init.d/slapd restart - On terminal #2 i'm running a infinite loops of simple "ldapsearch" (100 concurrent processes running loops of ldapsearch). Terminal #2 is trying to simulate many concurrent read operations. see "more information" later for the exact scripts that i used.

Incorrect behavior: ------------------- The "slapd restart" works a few times, and then the "stop" operation fails. The stop continues to fail even if i stop all "stress" and terminate all ldapsearch/connections (CPU is 99% idle !)

Expected Behavior: ------------------ All slapd stop/restart operations complete successfully

More Information (optional):D%D ---------------------------- On terminal#2 i used a very simple script to generate a "read only" stress: # cat > ldaploop.sh << EOF #!/bin/sh while true ; do ldapsearch -x -Z ; done EOF

# cat > manyloops.sh << "EOF" #!/bin/sh for i in `seq 1 100` ; do ( ./ldaploop.sh &) ; done EOF

As previously mentioned, i ran the "manyloops.sh" to generate 100 running processes where each one simply runs "ldapsearch" (locally).

thanks in advance, Zvika Ferentz