Bug 1617941 – RT system hang due to wrong of rq's nr_running [rhel-7.5.z]

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Bug 1617941 - RT system hang due to wrong of rq's nr_running [rhel-7.5.z]

Summary:	RT system hang due to wrong of rq's nr_running [rhel-7.5.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	kernel-rt (Show other bugs)
Sub Component:
Version:	7.4
Hardware:	x86_64 Linux

Priority	high Severity urgent
Target Milestone:	rc
Target Release:	---
Assigned To:	Luis Claudio R. Goncalves
QA Contact:	Jiri Kastner
Docs Contact:	Marie Dolezelova

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	1608672 1618466
Blocks:
	Show dependency tree / graph

Reported:	2018-08-16 04:25 EDT by Oneata Mircea Teodor
Modified:	2018-09-25 15:11 EDT (History)
CC List:	9 users (show)

See Also:
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 15:10:41 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:2763	None	None	None	2018-09-25 15:11 EDT

Groups: None (edit)

Description Oneata Mircea Teodor 2018-08-16 04:25:39 EDT

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 15:10:41 EDT

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

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