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Bug 1526929

Summary:	checkpoint thread hangs [rhel-7.4.z]
Product:	Red Hat Enterprise Linux 7	Reporter:	Oneata Mircea Teodor <toneata>
Component:	libdb	Assignee:	Petr Kubat <pkubat>
Status:	CLOSED ERRATA	QA Contact:	Vaclav Danek <vdanek>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	7.2	CC:	adam, afarley, aheverle, a.v.miroshnichenko, chhudson, databases-maint, ekeck, fkrska, glamb, gparente, hhorak, jprokes, lkrispen, mmuzila, msauton, mskalick, nathan.t.mcgarvey, pkubat, spurrier, tbordaz, tmihinto, tscherf, vdanek, vonsch, wibrown
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libdb-5.3.21-21.el7_4	Doc Type:	Bug Fix
Doc Text:	Previously, the libdb database did not lock its internal buffers in the correct order when it accessed pages located in an off-page duplicate (OPD) tree while processing operations on a cursor. A writer process accessed first the primary tree and then the OPD tree while a reader process did the same in the reverse order. When a writer process accessed a page from the primary tree while a reader process accessed a page from the OPD tree, the processes were unable to access the page from the other tree because the pages were simultaneously locked by the other process. This consequently caused a deadlock in libdb because neither of the processes released their locks. With this update, the btree version of the "cursor->get" method has been modified to lock the tree's pages in the same order as the writing methods, that is, the primary tree first and the OPD tree second. As a result, deadlocks in libdb no longer occur in the described scenario.	Story Points:	---
Clone Of:	1349779	Environment:
Last Closed:	2018-01-25 12:21:55 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:	1349779
Bug Blocks:

Description Oneata Mircea Teodor 2017-12-18 08:19:05 UTC

This bug has been copied from bug #1349779 and has been proposed to be backported to 7.4 z-stream (EUS).

Comment 12 errata-xmlrpc 2018-01-25 12:21:55 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.

https://access.redhat.com/errata/RHBA-2018:0162