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Bug 1617941

Summary:	RT system hang due to wrong of rq's nr_running [rhel-7.5.z]
Product:	Red Hat Enterprise Linux 7	Reporter:	Oneata Mircea Teodor <toneata>
Component:	kernel-rt	Assignee:	Luis Claudio R. Goncalves <lgoncalv>
kernel-rt sub component:	Memory Management	QA Contact:	Jiri Kastner <jkastner>
Status:	CLOSED ERRATA	Docs Contact:	Marie Hornickova <mdolezel>
Severity:	urgent
Priority:	high	CC:	bhu, crwood, dhoward, jiang.biao2, jkastner, kernel-eus-qe, lgoncalv, mkolaja, stalexan, tian.yongjiang
Version:	7.4	Keywords:	ZStream
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	kernel-rt-3.10.0-862.13.1.rt56.816.el7	Doc Type:	Bug Fix
Doc Text:	Previously, preemption was enabled too early after a context switch. If a task was migrated to another CPU after a context switch, a mismatch between CPU and runqueue during load balancing sometimes occurred. Consequently, a runnable task on an idle CPU failed to run, and the operating system became unresponsive. This update disables preemption in the schedule_tail() function. As a result, CPU migration during post-schedule processing no longer occurs, which prevents the above mismatch. The operating system no longer hangs due to this bug.	Story Points:	---
Clone Of:	1608672	Environment:
Last Closed:	2018-09-25 19:10:41 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:	1608672, 1618466
Bug Blocks:

Description Oneata Mircea Teodor 2018-08-16 08:25:39 UTC

This bug has been copied from bug #1608672 and has been proposed to be backported to 7.5 z-stream (EUS).

Comment 8 errata-xmlrpc 2018-09-25 19:10:41 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-2018:2763