Bug 1567744 – Hang or NULL pointer dereference if reading sysfs during VDO start/stop. [rhel-7.5.z]

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Bug 1567744 - Hang or NULL pointer dereference if reading sysfs during VDO start/stop. [rhel-7.5.z]

Summary:	Hang or NULL pointer dereference if reading sysfs during VDO start/stop. [rhe...

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	kmod-kvdo (Show other bugs)
Sub Component:
Version:	7.5
Hardware:	Unspecified Unspecified

Priority	high Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Thomas Jaskiewicz
QA Contact:	Jakub Krysl
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	1559692
Blocks:
	Show dependency tree / graph

Reported:	2018-04-16 03:03 EDT by Oneata Mircea Teodor
Modified:	2018-05-14 12:13 EDT (History)
CC List:	6 users (show)

See Also:
Fixed In Version:	6.1.0.164
Doc Type:	If docs needed, set a value
Doc Text:	When a process was reading Virtual Data Optimizer (VDO) sysfs entries while a VDO volume was starting up or shutting down, the process and the VDO task sometimes became unresponsive or terminated unexpectedly. With this update, the sysfs entries are created and released at the correct time. As a result, the described problem no longer occurs
Story Points:	---
Clone Of:	1559692
Environment:
Last Closed:	2018-05-14 12:13:32 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2018:1407	None	None	None	2018-05-14 12:13 EDT

Groups: None (edit)

Description Oneata Mircea Teodor 2018-04-16 03:03:27 EDT

This bug has been copied from bug #1559692 and has been proposed to be backported to 7.5 z-stream (EUS).

Comment 3 Jakub Krysl 2018-05-03 11:35:29 EDT

Using the reproducer I was not able to get vdo to hang or get any calltrace. Reading from /sys correctly produces either value ('0') or error ('cat: /sys/kvdo/vdo0/statistics/data_blocks_used: No such file or directory'). The start/stop cycle keeps going.
No regressions found as regression testing passed.

Comment 6 errata-xmlrpc 2018-05-14 12:13:32 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/RHBA-2018:1407

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