Bug 1784895

Summary:	RBD block devices remained mapped after concurrent "rbd unmap" failures
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Jason Dillaman <jdillama>
Component:	RBD	Assignee:	Jason Dillaman <jdillama>
Status:	CLOSED ERRATA	QA Contact:	Harish Munjulur <hmunjulu>
Severity:	urgent	Docs Contact:
Priority:	high
Version:	4.0	CC:	ceph-eng-bugs, gpatta, hgurav, hmunjulu, hyelloji, jbrier, knortema, mkasturi, tchandra, tserlin
Target Milestone:	rc
Target Release:	4.1
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ceph-14.2.8-3.el8, ceph-14.2.8-3.el7	Doc Type:	Bug Fix
Doc Text:	.Multiple `rbd unmap` commands can be issued concurrently and the corresponding RBD block devices are unmapped successfully Previously, issuing concurrent `rbd unmap` commands could result in udev-related event race conditions. The commands would sporadically fail, and the corresponding RBD block devices might remain mapped to their node. With this update, the udev-related event race conditions have been fixed, and the commands no longer fail.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-05-19 17:31:24 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:
Bug Depends On:
Bug Blocks:	1783415, 1816167

Description Jason Dillaman 2019-12-18 15:42:37 UTC

Description of problem:
Unmapping 200 images concurrently leaves behind 10-20 mappings. This is simulating an OCS workload mapping/unmapping RBD PVs on a node.

Version-Release number of selected component (if applicable):
14.2.4-69.el8cp

How reproducible:
100%

Steps to Reproduce:
1. Map hundreds of RBD images to a single node (simulate OCS PVs getting mapped to a pod)
2. Unmap the volumes concurrently

Actual results:
Several RBD block devices remained mapped

Expected results:
All RBD block devices are unmapped

Comment 2 Jason Dillaman 2020-01-07 14:02:48 UTC

Moving to 4.0.z1 pending QE ack.

Comment 10 Harish Munjulur 2020-04-17 00:01:56 UTC

Issue not reproducible on ceph 4.1(14.2.8-21.el8)

Comment 11 Harish Munjulur 2020-04-17 00:02:56 UTC

QE: Verified

Comment 15 errata-xmlrpc 2020-05-19 17:31:24 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.

https://access.redhat.com/errata/RHSA-2020:2231