Bug 1496650 – Fix hang after unplugging a device

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Bug 1496650 - Fix hang after unplugging a device

Summary:	Fix hang after unplugging a device

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	xorg-x11-drv-wacom (Show other bugs)
Sub Component:
Version:	7.4
Hardware:	Unspecified Unspecified

Priority	unspecified Severity unspecified
Target Milestone:	rc
Target Release:	---
Assigned To:	Peter Hutterer
QA Contact:	Desktop QE
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Reported:	2017-09-28 00:22 EDT by Peter Hutterer
Modified:	2018-04-10 07:53 EDT (History)
CC List:	2 users (show)

See Also:
Fixed In Version:	xorg-x11-drv-wacom-0.34.2-3.el7
Doc Type:	If docs needed, set a value
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Last Closed:	2018-04-10 07:52:21 EDT
Type:	Bug
Regression:	---
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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHBA-2018:0736	None	None	None	2018-04-10 07:53 EDT

Groups: None (edit)

Description Peter Hutterer 2017-09-28 00:22:53 EDT

Description of problem:
Unplugging a device may cause a hang and a log filling up with "Error reading wacom device : No such device". This is caused by the fd still being read by the input thread in the server even when all we get are ENODEV errors.

Version-Release number of selected component (if applicable):
xorg-x11-drv-wacom-0.34.2

How reproducible:
Plug in a device, use it, unplug. Look for "Error reading wacom device : No such device" in the log. This message should occur once per device, anything more is a bug.

This is a race condition and can be more difficult to trigger on some devices. Once the udev device removal event is received by the server, the device will be removed and the messages will stop.


Additional info:
Upstream bug https://bugzilla.redhat.com/show_bug.cgi?id=1478397

Comment 1 Peter Hutterer 2017-10-05 00:10:08 EDT

xorg-x11-drv-wacom-0.34.2-3.el7 is available in brew

Comment 4 Michael Boisvert 2018-02-07 12:24:21 EST

I was able to reproduce the log fill up using xorg-x11-drv-wacom-0.34.2-2 and verified the log contained only one message per device upon disconnecting a Wacom 22HDT on xorg-x11-drv-wacom-0.34.2-4.

Comment 7 errata-xmlrpc 2018-04-10 07:52:21 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-2018:0736

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