Re: (ITS#3993) slapd is using 99% of the cpu, hanging in sched_yield()

[hyc@symas.com]

In general, bugs reported against old releases will not be investigated. 
2.2.28 is the latest 2.2 release. You should test against that. Make 
sure you have a build with debug enabled and without stripping the 
symbol table. If the problem recurs, attach with gdb and get a stack 
trace of all of the running threads. Without this information, there's 
nothing to go on here.

r@sil.at wrote:
> Full_Name: Raimund Sacherer
> Version: 2.2.23 (Debian: 2.2.23-8)
> OS: Debian GNU/Linux
> URL: ftp://ftp.openldap.org/incoming/
> Submission from: (NULL) (213.235.212.193)
>
>
> Hello,
>
> we are using the slapd version 2.2.23 (-8 Debian) for production use. We are
> currently switching from an older version from bsd to debian, on our test system
> (Linux Kernel: 2.6.8-1-k7) i encounterd the following problem:
>
> i tried to test import ldiff data yesterday evening, it worked, i could connect
> to the server and view/modify the data. 
>
> i went home and today in the morning i tried to ssh on the box, now:
>
> 1. the load of this machine was about 29
> 2. 100% of the cpu was used
> 3. no process claimed using cpu
>
> then i tried to restart the slapd because of changes in the slapd.conf file and
> from i now can not tell if slapd stoped and started again, or if it's hanging
> since the restart command.
>
> strace -p <slapd-process> delivers the following output:
>
> sched_yield()                           = 0
> sched_yield()                           = 0
> sched_yield()                           = 0
> sched_yield()                           = 0
> sched_yield()                           = 0
> sched_yield()                           = 0
> sched_yield()                           = 0
>
>
> i googled a bit about the sched_yield and found that other people also have some
> problems with sched_yield.
>
>
> i am currently trying to use slapd 2.2.26 as it's called the 'stable' version,
> we backport it from debian/testing, but i am not sure if this will solve the
> problem, as i do not know if it's kernel-related or whatever.
>
>
> best regards
>
> raimund
>
>
>   


-- 
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc
  OpenLDAP Core Team            http://www.openldap.org/project/