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Bug 1086907

Summary:	Performing deletes during tombstone purging results in operation errors
Product:	Red Hat Enterprise Linux 6	Reporter:	Noriko Hosoi <nhosoi>
Component:	389-ds-base	Assignee:	Noriko Hosoi <nhosoi>
Status:	CLOSED ERRATA	QA Contact:	Sankar Ramalingam <sramling>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.6	CC:	jgalipea, mreynolds, nkinder, rmeggins, vashirov
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	389-ds-base-1.2.11.15-34.el6	Doc Type:	Bug Fix
Doc Text:	Cause: Deleting entries while tombstone purging is occurring Consequence: Some delete operations will fail with an error 1. Fix: The error 1 was triggered because the parent entry was replaced in the entry cache. The fix retries to obtain the parent entry until it succeeds or times out. Result: Delete operations succeed as expected	Story Points:	---
Clone Of:
Clones:	1086908 (view as bug list)		Environment:
Last Closed:	2014-10-14 07:54:53 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Noriko Hosoi 2014-04-11 19:32:34 UTC

Description of problem:
There is a race condition when looking up the parent of a deleted entry, where the cached entry is replaced by tombstone purging(updating the parents tombstonenumsubordinate attribute). The cached entry gets removed just after retrieving the entry from the cache, but before it can be locked (cache_lock_entry). This results in an operations error when trying to lock the entry that was just retrieved from the cache.

Comment 1 mreynolds 2014-04-21 15:30:00 UTC

Upstream ticket

https://fedorahosted.org/389/ticket/47771

Comment 2 mreynolds 2014-04-21 17:30:17 UTC

Verification steps:

[1]  Create one instance, but enable/setup replication(no agreement needed)
[2]  Set the tombstone purging interval to 20 seconds

  example: 

dn: cn=replica,cn=dc\3Dexample\2Cdc\3Dcom,cn=mapping tree,cn=config
changetype: modify
replace: nsDS5ReplicaTombstonePurgeInterval
nsDS5ReplicaTombstonePurgeInterval: 20

[3]  Import or add 500 entries
[4]  Delete those 500 entries
[5]  All the delete operations should pass, and not report an error 1(operations error), or any error for that fact.

Comment 4 Viktor Ashirov 2014-08-06 13:25:26 UTC

1. Create one instance, but enable/setup replication (no agreement needed)
2. Set the tombstone purging interval to 20 seconds

$ ldapmodify -D "cn=Directory Manager" -w Secret123  -H ldap://localhost:1389 << EOF
> dn: cn=changelog5,cn=config
> changetype: add
> objectclass: top
> objectclass: extensibleObject
> cn: changelog5
> nsslapd-changelogdir: /var/lib/dirsrv/slapd-rhel6ds/changelogdb
> nsslapd-changelogmaxage: 10d
> EOF
adding new entry "cn=changelog5,cn=config"

$ ldapmodify -D "cn=Directory Manager" -w Secret123  -H ldap://localhost:1389 << EOF
> dn: cn=replica,cn=dc\=example\,dc\=com,cn=mapping tree,cn=config
> changetype: add
> objectclass: top
> objectclass: nsds5replica
> objectclass: extensibleObject
> cn: replica
> nsds5replicaroot: dc=example,dc=com
> nsds5replicaid: 7
> nsds5replicatype: 3
> nsds5flags: 1
> nsds5ReplicaPurgeDelay: 604800
> nsds5ReplicaBindDN: cn=replication manager,cn=config
> nsDS5ReplicaTombstonePurgeInterval: 20
> EOF
adding new entry "cn=replica,cn=dc\=example\,dc\=com,cn=mapping tree,cn=config"

3. Import or add 500 entries
$ ldclt -h localhost -p 1389 -D "cn=Directory Manager" -w Secret123 -f cn=MrXXXXX -b "ou=people,dc=example,dc=com" -e add,person,incr,noloop,commoncounter -r0 -R499 -n 1 -v
ldclt version 4.23
/usr/bin/ldclt-bin -h localhost -p 1389 -D "cn=Directory Manager" -w Secret123 -f cn=MrXXXXX -b ou=people,dc=example,dc=com -e add,person,incr,noloop,commoncounter -r0 -R499 -n 1 -v
Process ID         = 24242
Host to connect    = localhost
Port number        = 1389
Bind DN            = cn=Directory Manager
Passwd             = Secret123
Referral           = on
Base DN            = ou=people,dc=example,dc=com
Filter             = "cn=MrXXXXX"
Max times inactive = 3
Max allowed errors = 1000
Number of samples  = -1
Number of threads  = 1
Total op. req.     = -1
Running mode       = 0x0e040201
Running mode       = verbose incremental commoncounter noloop add class=person
LDAP oper. timeout = 30 sec
Sampling interval  = 10 sec
Values range       = [0 , 499]
Filter's head      = "cn=Mr"
Filter's tail      = ""
ldclt[24242]: Starting at Wed Aug  6 15:18:09 2014

ldclt[24242]: T000: Hit top incrementeal value
ldclt[24242]: T000: thread is dead.
ldclt[24242]: Average rate:  500.00/thr  (  50.00/sec), total:    500
ldclt[24242]: Average rate:    0.00/thr  (   0.00/sec), total:      0
ldclt[24242]: All threads are dead - exit.
ldclt[24242]: Global average rate:  500.00/thr  ( 25.00/sec), total:    500
ldclt[24242]: Global number times "no activity" reports: never
ldclt[24242]: Global number of dead threads: 1
ldclt[24242]: Global no error occurs during this session.
ldclt[24242]: Ending at Wed Aug  6 15:18:29 2014
ldclt[24242]: Exit status 0 - No problem during execution.


4. Delete those 500 entries
$ ldclt -h localhost -p 1389 -D "cn=Directory Manager" -w Secret123 -f cn=MrXXXXX -b "ou=people,dc=example,dc=com" -e delete,person,incr,noloop,commoncounter -r0 -R499 -n 1 -v
ldclt version 4.23
/usr/bin/ldclt-bin -h localhost -p 1389 -D "cn=Directory Manager" -w Secret123 -f cn=MrXXXXX -b ou=people,dc=example,dc=com -e delete,person,incr,noloop,commoncounter -r0 -R499 -n 1 -v
Process ID         = 24250
Host to connect    = localhost
Port number        = 1389
Bind DN            = cn=Directory Manager
Passwd             = Secret123
Referral           = on
Base DN            = ou=people,dc=example,dc=com
Filter             = "cn=MrXXXXX"
Max times inactive = 3
Max allowed errors = 1000
Number of samples  = -1
Number of threads  = 1
Total op. req.     = -1
Running mode       = 0x0b040201
Running mode       = verbose incremental commoncounter noloop delete class=person
LDAP oper. timeout = 30 sec
Sampling interval  = 10 sec
Values range       = [0 , 499]
Filter's head      = "cn=Mr"
Filter's tail      = ""
ldclt[24250]: Starting at Wed Aug  6 15:18:47 2014

ldclt[24250]: T000: Hit top incrementeal value
ldclt[24250]: T000: thread is dead.
ldclt[24250]: Average rate:  500.00/thr  (  50.00/sec), total:    500
ldclt[24250]: Average rate:    0.00/thr  (   0.00/sec), total:      0
ldclt[24250]: All threads are dead - exit.
ldclt[24250]: Global average rate:  500.00/thr  ( 25.00/sec), total:    500
ldclt[24250]: Global number times "no activity" reports: never
ldclt[24250]: Global number of dead threads: 1
ldclt[24250]: Global no error occurs during this session.
ldclt[24250]: Ending at Wed Aug  6 15:19:07 2014
ldclt[24250]: Exit status 0 - No problem during execution.

No errors were returned, hence marking as VERIFIED.

Comment 5 errata-xmlrpc 2014-10-14 07:54:53 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/RHBA-2014-1385.html