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Bug 1140095

Summary:	untimely EINTR in clvmd's main_loop may cause thread list corruption
Product:	Red Hat Enterprise Linux 7	Reporter:	Petr Rockai <prockai>
Component:	lvm2	Assignee:	Petr Rockai <prockai>
lvm2 sub component:	Clustering / clvmd	QA Contact:	cluster-qe <cluster-qe>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	unspecified
Priority:	unspecified	CC:	agk, cmarthal, heinzm, jbrassow, msnitzer, nperic, prajnoha, prockai, zkabelac
Version:	7.0
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	lvm2-2.02.125-1.el7	Doc Type:	Bug Fix
Doc Text:	Untimely EINTR signal received in clvmd's may have caused internal list corruption and application misbehaving. Clvms has corrected its reaction on interrupt.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-11-19 12:45:38 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Petr Rockai 2014-09-10 09:54:22 UTC

In the clvmd main_loop, we iterate through the list of client fd's, using thisfd/lastfd as iteration variables. Specifically, lastfd is used when unlinking dead clients from the list (removeme is set, line 886 lastfd->next = thisfd->next). However, if EINTR or EAGAIN come in at the right moment (in a thread immediately preceding a dead thread), lastfd fails to be updated, as the loop is short-circuited by the continue on line 903. This causes the EINTR'd thread to be lost from the list.

Comment 2 Petr Rockai 2014-09-10 10:21:35 UTC

The QA on this bug would entail sanity-only checking, as it would be extraordinarily hard to create circumstances for this to happen.

Comment 3 Nenad Peric 2014-10-10 09:30:17 UTC

Acking as SanityOnly as proposed in comment #2

Comment 4 Petr Rockai 2015-02-18 11:49:05 UTC

Fix checked in upstream as 373f8556847a8fdbed3cedd687691d716dca4c5a.

Comment 7 Corey Marthaler 2015-10-19 23:15:07 UTC

Marking verified (SanityOnly) based on comment #2. Basic clvm regression tests pass in the latest rpms.

3.10.0-325.el7.x86_64

lvm2-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
lvm2-libs-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
lvm2-cluster-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-libs-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-event-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-event-libs-1.02.107-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
device-mapper-persistent-data-0.5.5-1.el7    BUILT: Thu Aug 13 09:58:10 CDT 2015
cmirror-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015
sanlock-3.2.4-1.el7    BUILT: Fri Jun 19 12:48:49 CDT 2015
sanlock-lib-3.2.4-1.el7    BUILT: Fri Jun 19 12:48:49 CDT 2015
lvm2-lockd-2.02.130-5.el7    BUILT: Wed Oct 14 08:27:29 CDT 2015

Comment 8 errata-xmlrpc 2015-11-19 12:45:38 UTC

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://rhn.redhat.com/errata/RHBA-2015-2147.html