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Bug 1395298

Summary:	RHEL 7.3: have rbd multipathd checker set lock_on_read rbd map setting
Product:	Red Hat Enterprise Linux 7	Reporter:	Marcel Kolaja <mkolaja>
Component:	device-mapper-multipath	Assignee:	Ben Marzinski <bmarzins>
Status:	CLOSED ERRATA	QA Contact:	Lin Li <lilin>
Severity:	unspecified	Docs Contact:
Priority:	high
Version:	7.3	CC:	agk, bmarzins, ceph-qe-bugs, heinzm, hnallurv, hyelloji, jbrassow, mchristi, mkolaja, msnitzer, mthacker, prajnoha, snagar, yizhan
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	device-mapper-multipath-0.4.9-99.el7_3.1	Doc Type:	Bug Fix
Doc Text:	Cause: When a Ceph rbd image is exported through multiple iSCSI targets, the rbd kernel module will grab the exclusive lock when it receives a write request. Consequence: If a write request is hung in the rbd module, and the iSCSI initiator and multipath layer decide to fail the request to the application, read requests sent after the failure may not reflect the state of the write. Fix: The rbd module will grab the exclusive lock for both reads and writes. This will cause hung writes to be flushed and or failed before executing reads. Result: Read requests sent after failed writes will always return the same data.	Story Points:	---
Clone Of:	1380602	Environment:
Last Closed:	2017-01-17 18:09:28 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:	1380602
Bug Blocks:

Description Marcel Kolaja 2016-11-15 16:11:51 UTC

This bug has been copied from bug #1380602 and has been proposed
to be backported to 7.3 z-stream (EUS).

Comment 3 Ben Marzinski 2016-11-21 21:32:15 UTC

Fix backported.

Comment 9 Hemanth Kumar 2017-01-04 09:28:25 UTC

Verified the fix on following Builds

device-mapper-multipath-0.4.9-99.el7.x86_64
ceph  10.2.3-13.el7cp.x86_64

Comment 12 errata-xmlrpc 2017-01-17 18:09:28 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://rhn.redhat.com/errata/RHBA-2017-0076.html