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Bug 1140095 - untimely EINTR in clvmd's main_loop may cause thread list corruption
Summary: untimely EINTR in clvmd's main_loop may cause thread list corruption
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: lvm2
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Petr Rockai
QA Contact: cluster-qe@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-09-10 09:54 UTC by Petr Rockai
Modified: 2021-09-03 12:39 UTC (History)
9 users (show)

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.
Clone Of:
Environment:
Last Closed: 2015-11-19 12:45:38 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:2147 0 normal SHIPPED_LIVE lvm2 bug fix and enhancement update 2015-11-19 11:11:07 UTC

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
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