Bug 62740

Summary:	get_anon_super() can leak unnamed devices
Product:	[Retired] Red Hat Public Beta	Reporter:	Paul Menage <paul.menage>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED RAWHIDE	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	skipjack-beta1
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2002-04-05 03:04:31 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:

Description Paul Menage 2002-04-05 03:04:27 UTC

Description of Problem:

In fs/super.c:get_anon_super(), if the compare() function ever returns success,
the new super block is destroyed, but the newly allocated unnamed device doesn't
get released.

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

2.4.18-0.4, 2.4.18-0.12

Steps to reproduce:

mkdir /tmp/pts
while true; do
  mount -t devpts devpts /tmp/pts
  umount /tmp/pts
done

Soon gives "Mount table full" errors

This seems to be fixed in 2.5.x by a reorganisation of the super-block
allocation code.

Comment 1 Arjan van de Ven 2002-04-05 16:40:15 UTC

fix backported; will appear in rawhide soon.
thanks for reporting this!

Comment 2 Pete Zaitcev 2002-04-09 20:05:24 UTC

HEAD 2.4.18-0.19