Bug 1028119 – dbus timeout

Bug 1028119 - dbus timeout

Summary:	dbus timeout

Status:	CLOSED CURRENTRELEASE

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	tuned (Show other bugs)
Sub Component:
Version:	7.0
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Jaroslav Škarvada
QA Contact:	Branislav Blaškovič
Docs Contact:

URL:
Whiteboard:
Keywords:	Patch

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2013-11-07 12:22 EST by Jaroslav Škarvada
Modified:	2014-06-18 03:34 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:	tuned-2.3.0-2.el7
Doc Type:	Bug Fix
Doc Text:	Cause: There was an hidden race condition in the Tuned code since the beginning of the Tuned v2 development. Consequence: If the switch profile command was sent to the Tuned daemon quickly more times (e.g. twice) and the previous switch profile command wasn't yet finished, the race condition may occur and the deadlock may trigger. In the deadlocked state the Tuned daemon stopped responding to further commands and had to be killed by the operator. Fix: The Tuned code was modified for the deadlock not to occur any more. Result: Multiple quick requests can be processed now and the Tuned daemon still responds.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2014-06-13 07:00:37 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Proposed fix (664 bytes, patch) 2013-11-07 17:34 EST, Jaroslav Škarvada	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Jaroslav Škarvada 2013-11-07 12:22:37 EST

Description of problem:
tuned-adm can timeout and tuned dies.

Version-Release number of selected component (if applicable):
tuned-2.3.0

How reproducible:
Sometimes

Steps to Reproduce:
1. Run the reproducer

Actual results:
dbus timeout

Expected results:
No timeout

Additional info:
Older tuned seems also affected.

Reproducer:

PROFILES=(balanced latency-performance powersave throughput-performance virtual-guest virtual-host)

for (( i=0; i < 100; i++ ))
do
  p=${PROFILES[$(( RANDOM % ${#PROFILES[@]} ))]}
  echo "iter: $i, profile: $p"
  tuned-adm profile $p
done

Comment 1 Jaroslav Škarvada 2013-11-07 12:24:51 EST

The source of this problem is currently unclear to me. I am working on it

Comment 2 Jaroslav Škarvada 2013-11-07 16:34:23 EST

I got it, there is race condition in the start/stop code. The race is there since the beginning of the tuned-2 development.

Comment 3 Jaroslav Škarvada 2013-11-07 16:36:53 EST

Simple reproducer:
tuned-adm profile balanced && tuned-adm profile balanced

Comment 4 Jaroslav Škarvada 2013-11-07 17:34:17 EST

Created attachment 821328 [details]
Proposed fix

Comment 7 Branislav Blaškovič 2013-11-19 05:25:14 EST

I cannot reproduce this with tuned-2.3.0-3.el7.noarch either.
Marking as VERIFIED.

Comment 8 Ludek Smid 2014-06-13 07:00:37 EDT

This request was resolved in Red Hat Enterprise Linux 7.0.

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