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Bug 988562

Summary:

deadlock after adding and deleting entries

Product:

Red Hat Enterprise Linux 6

Reporter:

Nathan Kinder <nkinder>

Component:

389-ds-base

Assignee:

Rich Megginson <rmeggins>

Status:

CLOSED ERRATA

QA Contact:

Sankar Ramalingam <sramling>

Severity:

high

Docs Contact:

Priority:

unspecified

Version:

6.5

CC:

amsharma, jgalipea, mreynolds, nhosoi

Target Milestone:

Target Release:

---

Hardware:

Unspecified

OS:

Unspecified

Whiteboard:

Fixed In Version:

389-ds-base-1.2.11.15-22.el6

Doc Type:

Bug Fix

Doc Text:

Story Points:

---

Clone Of:

988559

Environment:

Last Closed:

2013-11-21 21:11:19 UTC

Type:

---

Regression:

---

Mount Type:

---

Documentation:

---

CRM:

Verified Versions:

Category:

---

oVirt Team:

---

RHEL 7.3 requirements from Atomic Host:

Cloudforms Team:

---

Target Upstream Version:

Embargoed:

Bug Depends On:

988559

Bug Blocks:

Attachments:

Description	Flags
LDIF file that adds and deletes 200 entries	none
LDIF file that adds and deletes 200 entries (2)	none
LDIF file that adds and deletes 200 entries (3)	none
LDIF file that adds and deletes 200 entries (4)	none
LDIF file that adds and deletes 200 entries (5)	none

Description Nathan Kinder 2013-07-25 20:14:13 UTC

+++ This bug was initially created as a clone of Bug #988559 +++

This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/47449

If you have multiple clients, each adding and deleting users the server will deadlock.  I created 5 ldif files.  Each ldif file added and then deleted 200 entries.  Using 5 separate ldapmodify's the server will deadlock within a minute or so.

Appears to be an issue with an entry cache lock not being unlocked:

Thread 29 (Thread 0x7f7d16bfd700 (LWP 8337)):
#3  0x0000003b56223fe9 in PR_Lock () from /lib64/libnspr4.so
#4  0x0000003b5622410b in PR_EnterMonitor () from /lib64/libnspr4.so
#5  0x00007f7d29eb19bb in dblayer_lock_backend (be=0x2094160) at ../ds/ldap/servers/slapd/back-ldbm/dblayer.c:3942
#6  0x00007f7d29eb102f in dblayer_txn_begin (be=0x2094160, parent_txn=0x0, txn=0x7f7d16bfa860) at ../ds/ldap/servers/slapd/back-ldbm/dblayer.c:3664
#7  0x00007f7d29eeb814 in ldbm_back_delete (pb=0x7f7d16bfcaa0) at ../ds/ldap/servers/slapd/back-ldbm/ldbm_delete.c:257
#8  0x00007f7d2dc8def4 in op_shared_delete (pb=0x7f7d16bfcaa0) at ../ds/ldap/servers/slapd/delete.c:364
#9  0x00007f7d2dc8d6dd in do_delete (pb=0x7f7d16bfcaa0) at ../ds/ldap/servers/slapd/delete.c:128
#10 0x000000000041578e in connection_dispatch_operation (conn=0x7f7d2464f730, op=0x231ee80, pb=0x7f7d16bfcaa0) at ../ds/ldap/servers/slapd/connection.c:643
#11 0x0000000000417524 in connection_threadmain () at ../ds/ldap/servers/slapd/connection.c:2482

Thread 27 (Thread 0x7f7d157fb700 (LWP 8339)):
#3  0x0000003b56223fe9 in PR_Lock () from /lib64/libnspr4.so
#4  0x0000003b5622410b in PR_EnterMonitor () from /lib64/libnspr4.so
#5  0x00007f7d29eb19bb in dblayer_lock_backend (be=0x2094160) at ../ds/ldap/servers/slapd/back-ldbm/dblayer.c:3942
#6  0x00007f7d29eb102f in dblayer_txn_begin (be=0x2094160, parent_txn=0x0, txn=0x7f7d157f6790) at ../ds/ldap/servers/slapd/back-ldbm/dblayer.c:3664
#7  0x00007f7d29ede3f1 in ldbm_back_add (pb=0x7f7d157faaa0) at ../ds/ldap/servers/slapd/back-ldbm/ldbm_add.c:261
#8  0x00007f7d2dc7dc4b in op_shared_add (pb=0x7f7d157faaa0) at ../ds/ldap/servers/slapd/add.c:735
#9  0x00007f7d2dc7cb96 in do_add (pb=0x7f7d157faaa0) at ../ds/ldap/servers/slapd/add.c:258
#10 0x000000000041576c in connection_dispatch_operation (conn=0x7f7d2464f878, op=0x22ec000, pb=0x7f7d157faaa0) at ../ds/ldap/servers/slapd/connection.c:638
#11 0x0000000000417524 in connection_threadmain () at ../ds/ldap/servers/slapd/connection.c:2482

Thread 15 (Thread 0x7f7d09bf5700 (LWP 8351)):
#0  0x000000377560e054 in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00000037756093be in _L_lock_995 () from /lib64/libpthread.so.0
#2  0x0000003775609326 in pthread_mutex_lock () from /lib64/libpthread.so.0
#3  0x0000003b56223fe9 in PR_Lock () from /lib64/libnspr4.so
#4  0x0000003b5622410b in PR_EnterMonitor () from /lib64/libnspr4.so
#5  0x00007f7d29eb19bb in dblayer_lock_backend (be=0x2094160) at ../ds/ldap/servers/slapd/back-ldbm/dblayer.c:3942
#6  0x00007f7d29eb102f in dblayer_txn_begin (be=0x2094160, parent_txn=0x0, txn=0x7f7d09bf0790) at ../ds/ldap/servers/slapd/back-ldbm/dblayer.c:3664
#7  0x00007f7d29ede3f1 in ldbm_back_add (pb=0x7f7d09bf4aa0) at ../ds/ldap/servers/slapd/back-ldbm/ldbm_add.c:261
#8  0x00007f7d2dc7dc4b in op_shared_add (pb=0x7f7d09bf4aa0) at ../ds/ldap/servers/slapd/add.c:735
#9  0x00007f7d2dc7cb96 in do_add (pb=0x7f7d09bf4aa0) at ../ds/ldap/servers/slapd/add.c:258
#10 0x000000000041576c in connection_dispatch_operation (conn=0x7f7d2464f4a0, op=0x232c850, pb=0x7f7d09bf4aa0) at ../ds/ldap/servers/slapd/connection.c:638
#11 0x0000000000417524 in connection_threadmain () at ../ds/ldap/servers/slapd/connection.c:2482


---> this thread is causing the deadlock

#3  0x0000003b56223fe9 in PR_Lock () from /lib64/libnspr4.so
#4  0x0000003b5622410b in PR_EnterMonitor () from /lib64/libnspr4.so
#5  0x00007f7d29ea7169 in cache_lock_entry (cache=0x21130b8, e=0x22f67a0) at ../ds/ldap/servers/slapd/back-ldbm/cache.c:1502
#6  0x00007f7d29ebee77 in find_entry_internal_dn (pb=0x7f7d073f0aa0, be=0x2094160, sdn=0x7f7ca400dec0, lock=1, txn=0x7f7d073ee860, flags=0)
    at ../ds/ldap/servers/slapd/back-ldbm/findentry.c:155
#7  0x00007f7d29ebf446 in find_entry_internal (pb=0x7f7d073f0aa0, be=0x2094160, addr=0x22f4b68, lock=1, txn=0x7f7d073ee860, flags=0)
    at ../ds/ldap/servers/slapd/back-ldbm/findentry.c:293
#8  0x00007f7d29ebf530 in find_entry2modify (pb=0x7f7d073f0aa0, be=0x2094160, addr=0x22f4b68, txn=0x7f7d073ee860)
    at ../ds/ldap/servers/slapd/back-ldbm/findentry.c:324
#9  0x00007f7d29eeb8b4 in ldbm_back_delete (pb=0x7f7d073f0aa0) at ../ds/ldap/servers/slapd/back-ldbm/ldbm_delete.c:273
#10 0x00007f7d2dc8def4 in op_shared_delete (pb=0x7f7d073f0aa0) at ../ds/ldap/servers/slapd/delete.c:364
#11 0x00007f7d2dc8d6dd in do_delete (pb=0x7f7d073f0aa0) at ../ds/ldap/servers/slapd/delete.c:128
#12 0x000000000041578e in connection_dispatch_operation (conn=0x7f7d2464f358, op=0x22f4a90, pb=0x7f7d073f0aa0) at ../ds/ldap/servers/slapd/connection.c:643
#13 0x0000000000417524 in connection_threadmain () at ../ds/ldap/servers/slapd/connection.c:2482

Comment 1 mreynolds 2013-07-25 20:20:12 UTC

Created attachment 778502 [details]
LDIF file that adds and deletes 200 entries

Comment 2 mreynolds 2013-07-25 20:20:54 UTC

Created attachment 778503 [details]
LDIF file that adds and deletes 200 entries (2)

Comment 3 mreynolds 2013-07-25 20:21:58 UTC

Created attachment 778504 [details]
LDIF file that adds and deletes 200 entries (3)

Comment 4 mreynolds 2013-07-25 20:22:30 UTC

Created attachment 778505 [details]
LDIF file that adds and deletes 200 entries (4)

Comment 5 mreynolds 2013-07-25 20:23:02 UTC

Created attachment 778506 [details]
LDIF file that adds and deletes 200 entries (5)

Comment 6 mreynolds 2013-07-25 20:27:39 UTC

Steps to reproduce:

[1]  Create an instance of 389 using "dc=example,dc=com" as the suffix.
[2]  Open 5 terminals, and run 5 ldapmodifys using the supplied ldifs at the same time. Example:

    ldapmodify -D "cn=directory manager" -w password -c -f add1.ldif

[3]  Keep running these ldapmodifys until the server hangs.  Usually happens in less than a minute.

Comment 8 Amita Sharma 2013-09-30 13:11:28 UTC

Followed steps in comment#6, Server did not hang so marking bug as VERIFIED.

Comment 9 errata-xmlrpc 2013-11-21 21:11:19 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-2013-1653.html