Bug 1347697

Summary: lvmetad should either die or disable itself in case of duplicated PVs - but never deadlock waiting on mutex
Product: Red Hat Enterprise Linux 7 Reporter: RamaKasturi <knarra>
Component: lvm2Assignee: David Teigland <teigland>
lvm2 sub component: LVM Metadata / lvmetad QA Contact: Zdenek Kabelac <zkabelac>
Status: CLOSED ERRATA Docs Contact:
Severity: unspecified    
Priority: unspecified CC: agk, cmarthal, heinzm, jbrassow, msnitzer, prajnoha, prockai, rbednar, zkabelac
Version: 7.2   
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: lvm2-2.02.161-2.el7 Doc Type: If docs needed, set a value
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Story Points: ---
Clone Of: Environment:
Last Closed: 2016-11-04 04:21:35 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 RamaKasturi 2016-06-17 12:22:07 UTC 
Description of problem:
lvmetad should either die or disable itself in case of duplicated PVs - but never deadlock waiting on mutex



Version-Release number of selected component (if applicable):
lvm2-2.02.130-5.el7_2.1.x86_64

How reproducible:
Always

Steps to Reproduce:
1. 
2.
3.

Actual results:


Expected results:


Additional info:
https://bugzilla.redhat.com/show_bug.cgi?id=1303940
Comment 2 David Teigland 2016-07-22 21:04:55 UTC 
This was done some time ago already.  lvmetad now disables itself when there are duplicate PVs.  Once the duplicates are resolved, a rescan (pvscan --cache) will reenable lvmetad.
Comment 4 Roman Bednář 2016-09-20 14:31:00 UTC 
Marking verified with latest rpms. 

LVM does not use lvmetad data from now on when duplicate PV is detected until solved.
Then it automatically restores normal operation.


# pvs -o +uuid
  WARNING: Not using lvmetad because duplicate PVs were found.
  WARNING: Use multipath or vgimportclone to resolve duplicate PVs?
  WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad.
  WARNING: PV mGsQGs-y0Xr-xAEB-aKzU-CLKw-fpHy-RN64tu on /dev/sdj was already found on /dev/sdi.
  WARNING: PV mGsQGs-y0Xr-xAEB-aKzU-CLKw-fpHy-RN64tu prefers device /dev/sdi because device was seen first.
  PV         VG            Fmt  Attr PSize   PFree   PV UUID                               
  /dev/sdi   cloneofvg     lvm2 a--  972.00m 972.00m mGsQGs-y0Xr-xAEB-aKzU-CLKw-fpHy-RN64tu
  /dev/vda2  rhel_virt-283 lvm2 a--    7.79g  40.00m RgLVtC-zhsS-aSpi-Qf8F-HcKk-LzhJ-ViCb8D

# systemctl is-active lvm2-lvmetad
active

3.10.0-505.el7.x86_64

lvm2-2.02.165-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
lvm2-libs-2.02.165-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
lvm2-cluster-2.02.165-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
device-mapper-1.02.134-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
device-mapper-libs-1.02.134-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
device-mapper-event-1.02.134-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
device-mapper-event-libs-1.02.134-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
device-mapper-persistent-data-0.6.3-1.el7    BUILT: Fri Jul 22 12:29:13 CEST 2016
cmirror-2.02.165-2.el7    BUILT: Wed Sep 14 16:01:43 CEST 2016
Comment 6 errata-xmlrpc 2016-11-04 04:21:35 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-2016-1445.html