Bug 1800475

Summary:	Symlink to cache pool metadata LV not removed after removing the cache pool
Product:	[Community] LVM and device-mapper	Reporter:	Vojtech Trefny <vtrefny>
Component:	lvm2	Assignee:	Zdenek Kabelac <zkabelac>
lvm2 sub component:	Udev	QA Contact:	cluster-qe <cluster-qe>
Status:	NEW ---	Docs Contact:
Severity:	unspecified
Priority:	high	CC:	agk, heinzm, jbrassow, msnitzer, prajnoha, zkabelac
Version:	unspecified	Flags:	pm-rhel: lvm-technical-solution? pm-rhel: lvm-test-coverage?
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Vojtech Trefny 2020-02-07 08:02:01 UTC

Description of problem:

There is some race condition between LVM and udev that results in the /dev/<vg>/<cachepool>_meta symlink not being removed after removing the cache pool using `lvconvert --uncache`. We see this only occasionally in our CI and only with RHEL/CentOS 8 and Debian 10.


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

  LVM version:     2.03.05(2)-RHEL8 (2019-06-15)
  Library version: 1.02.163-RHEL8 (2019-06-15)
  Driver version:  4.39.0

How reproducible:


Steps to Reproduce:

lvcreate -L512m -n testLV testVG
lvcreate -L512m -n testCache testVG
lvcreate -L8m -n testCache_meta testVG
lvconvert -y --type cache-pool --poolmetadata testCache_meta --cachemode writethrough testVG/testCache
lvconvert -y --type cache --cachepool testVG/testCache testVG/testLV
lvconvert -y -f --uncache testVG/testLV

ls /dev/testVG/testCache*
/dev/testVG/testCache_meta