Bug 1859196

Summary:	etcd: Fix deadlock bug in mvcc
Product:	OpenShift Container Platform	Reporter:	Sam Batschelet <sbatsche>
Component:	Etcd	Assignee:	Sam Batschelet <sbatsche>
Status:	CLOSED ERRATA	QA Contact:	ge liu <geliu>
Severity:	high	Docs Contact:
Priority:	high
Version:	4.5	CC:	skolicha
Target Milestone:	---
Target Release:	4.6.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:
Clones:	1859201 (view as bug list)		Environment:
Last Closed:	2020-10-27 16:16:18 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:	1859201

Description Sam Batschelet 2020-07-21 12:21:46 UTC

Description of problem: In the case where a slow or new member receives a snapshot from leader and attempts to applySnapshot meanwhile cluster runs compaction a deadlock can occur.


Version-Release number of selected component (if applicable): etcd 3.x


How reproducible: conditions would need to exist which would be relatively low probability. But the result would be very hard for an already struggling cluster to overcome.


Steps to Reproduce:
1.partition member
2.perform a lot of writes to cluster
3.unpartition member right before compaction

Actual results: cluster can experience deadlock and hang causing possible disruption.


Expected results: cluster remains available 


Additional info:

Comment 5 errata-xmlrpc 2020-10-27 16:16:18 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 (OpenShift Container Platform 4.6 GA Images), 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-2020:4196