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Bug 885078 - sssd_nss crashes during enumeration if the enumeration is taking too long
Summary: sssd_nss crashes during enumeration if the enumeration is taking too long
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: sssd
Version: 6.4
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Jakub Hrozek
QA Contact: Kaushik Banerjee
URL:
Whiteboard:
Depends On:
Blocks: 895654
TreeView+ depends on / blocked
 
Reported: 2012-12-07 13:05 UTC by Kaushik Banerjee
Modified: 2020-05-02 17:10 UTC (History)
6 users (show)

Fixed In Version: sssd-1.9.2-55.el6
Doc Type: Bug Fix
Doc Text:
No documentation needed.
Clone Of:
Environment:
Last Closed: 2013-02-21 09:42:24 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
Backtrace of sssd_nss crash (5.86 KB, text/plain)
2012-12-07 13:05 UTC, Kaushik Banerjee 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Github SSSD sssd issues 2744 0 None None None 2020-05-02 17:09:46 UTC
Github SSSD sssd issues 2759 0 None None None 2020-05-02 17:10:42 UTC
Red Hat Product Errata RHSA-2013:0508 0 normal SHIPPED_LIVE Low: sssd security, bug fix and enhancement update 2013-02-20 21:30:10 UTC

Description Kaushik Banerjee 2012-12-07 13:05:18 UTC 
Created attachment 659350 [details]
Backtrace of sssd_nss crash

Description of problem:
sssd_nss crashes during enumeration and with ldap_default_bind_dn in sssd.conf

Version-Release number of selected component (if applicable):
1.9.2-34

How reproducible:
Almost always. The crash is in middle of enumerating 30k users on the ldap server.

Steps to Reproduce:
1. Setup sssd with the following in domain section:
[domain/LDAP]
enumerate = True
debug_level = 0xFFF0
cache_credentials = True
ldap_search_base = dc=example,dc=org
id_provider = ldap
auth_provider = ldap
chpass_provider = ldap
ldap_uri = ldap://ldapserver.example.org
ldap_default_bind_dn = cn=Manager,dc=example,dc=org
ldap_default_authtok = password

2. Observe the domain log. Wait for enumeration to complete.
  
Actual results:
Enumeration goes on forever. And sssd_nss crashes after sometime. See attachment for backtrace.

sssd_be cpu usage is about 98%
21727 root      20   0  383m 167m 3572 R 98.1 16.9   1:09.61 sssd_be 

Expected results:
Enumeration should complete and sssd_nss should not crash.

Additional info:
Comment 2 Jakub Hrozek 2012-12-07 15:59:38 UTC 
Upstream ticket:
https://fedorahosted.org/sssd/ticket/1702
Comment 4 Jakub Hrozek 2012-12-15 18:00:33 UTC 
Kaushik can you try and reproduce the issue again? I can't see the crash with git head.
Comment 6 Kaushik Banerjee 2012-12-17 11:39:53 UTC 
Using the builds from the previous comment, I haven't seen nss crash.

However I still do see the following issues:
1. Enumeration go on forever using bind-credentials. Whereas with anonymous bind(without ldap_default_bind_dn), enumeration of 30k users got over in less than 2mins.

2. Enumerating 30k users using non-anonymous bind makes sssd_be hog the cpu(98%) forever.
Comment 7 Jakub Hrozek 2012-12-17 16:21:35 UTC 
(In reply to comment #6)
> Using the builds from the previous comment, I haven't seen nss crash.
> 
> However I still do see the following issues:
> 1. Enumeration go on forever using bind-credentials. Whereas with anonymous
> bind(without ldap_default_bind_dn), enumeration of 30k users got over in
> less than 2mins.
> 
> 2. Enumerating 30k users using non-anonymous bind makes sssd_be hog the
> cpu(98%) forever.

OK, these two are bad as well. Can you please file a separate bug and also check out if the same happened with 6.3 packages? To check out whether it is a regression or not, which would help us evaluate the priority.
Comment 8 Jakub Hrozek 2012-12-18 17:59:04 UTC 
Upstream ticket:
https://fedorahosted.org/sssd/ticket/1717
Comment 9 Kaushik Banerjee 2012-12-19 11:39:55 UTC 
There was a paging configuration issue on my ldap server that made me see different issues for anonymous and non-anonymous binds as discussed in comment 6.

I either case, sssd_be hogs the cpu for a very long time. I have opened bug 888739 in that regards.
Comment 12 Kaushik Banerjee 2013-01-16 08:25:58 UTC 
Verified in version sssd-1.9.2-72

Verified manually. Crash is no longer seen.
Comment 13 errata-xmlrpc 2013-02-21 09:42:24 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2013-0508.html
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