Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

Bug 795108

Summary: VDSM: Failed remove snapshot VolumeDoesNotExist:
Product: [Retired] oVirt Reporter: Avi Tal <atal>
Component: vdsmAssignee: Eduardo Warszawski <ewarszaw>
Status: CLOSED UPSTREAM QA Contact: yeylon <yeylon>
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abaron, acathrow, amureini, bazulay, danken, iheim, ilvovsky, mikom3, oramraz, srevivo, ykaul
Target Milestone: ---Keywords: TestBlocker
Target Release: 3.3.4   
Hardware: x86_64   
OS: Linux   
Whiteboard: storage
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: 788640 Environment:
Last Closed: 2012-07-19 14:00:49 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: Storage RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 788640, 836562    
Bug Blocks:    

Description Avi Tal 2012-02-19 12:21:28 UTC 
+++ This bug was initially created as a clone of Bug #788640 +++

Created attachment 560317 [details]
vdsm log

Description of problem:
running remove snapshot1 from rest api on a VM that contain 8 disks and 2 snapshots.
the VDSM log show that VolumeDoesNotExist on some of the disks/images.

Steps to Reproduce (via REST API): 
1. create 8 disks (different permutations)
2. create snapshot1
3. create snapshot2
4. restore snapshot2
5. remove snapshot1

--- Additional comment from atal on 2012-02-08 12:08:14 EST ---

=============================================================================
before remove:

    |       |-- images
    |       |   |-- 323cc6d2-9ca7-4c2a-9f15-ce0dceffecfd
    |       |   |   |-- 3551ac7f-b8ae-475d-985f-42fdb8ece9ed
    |       |   |   |-- 3551ac7f-b8ae-475d-985f-42fdb8ece9ed.meta
    |       |   |   |-- a1bcc370-8aff-4505-b0b4-dda07a2a3a87
    |       |   |   `-- a1bcc370-8aff-4505-b0b4-dda07a2a3a87.meta
    |       |   |-- 5654d919-57cc-4191-8c95-cbbdaae86da0
    |       |   |   |-- 73130d19-315f-4b9a-a587-f2ca6bef832d
    |       |   |   |-- 73130d19-315f-4b9a-a587-f2ca6bef832d.meta
    |       |   |   |-- cc6d3169-f6c1-4883-a230-e907d5f529f3
    |       |   |   `-- cc6d3169-f6c1-4883-a230-e907d5f529f3.meta
    |       |   |-- 7256c667-67bd-4f7b-831c-09a34cdb5341
    |       |   |   |-- 63d25749-7028-4310-825c-21ad8550f5a3
    |       |   |   `-- 63d25749-7028-4310-825c-21ad8550f5a3.meta
    |       |   |-- 87b22375-6194-421f-8f29-7e6235b698f6
    |       |   |   |-- 40f0e01b-245f-4392-87df-323196d4ad87
    |       |   |   |-- 40f0e01b-245f-4392-87df-323196d4ad87.meta
    |       |   |   |-- 4b92660f-c57e-4095-8167-bdf7f4187dcb
    |       |   |   `-- 4b92660f-c57e-4095-8167-bdf7f4187dcb.meta
    |       |   |-- 8f539492-68df-4fb3-b670-1d5980d3e2d0
    |       |   |   |-- 0bc19895-2e10-4398-b940-25b2b76bc37f
    |       |   |   |-- 0bc19895-2e10-4398-b940-25b2b76bc37f.meta
    |       |   |   |-- 67f1e1a4-eaec-4f3e-9b16-943cd769e521
    |       |   |   `-- 67f1e1a4-eaec-4f3e-9b16-943cd769e521.meta
    |       |   |-- a2d85350-6bdd-4bd3-84fb-babfa699e9fa
    |       |   |   |-- c364e127-ea2f-4b22-86dd-25279142b037
    |       |   |   |-- c364e127-ea2f-4b22-86dd-25279142b037.meta
    |       |   |   |-- e9cc6664-fa20-4a84-9e10-6fbee025d691
    |       |   |   `-- e9cc6664-fa20-4a84-9e10-6fbee025d691.meta
    |       |   |-- ced369d3-ffc7-40f9-aa07-db6fb330b785
    |       |   |   |-- 14903ddf-2654-4a7c-a632-756b74d50f62
    |       |   |   |-- 14903ddf-2654-4a7c-a632-756b74d50f62.meta
    |       |   |   |-- 8e3778c5-a8f7-4e6b-838f-2ec6bfbb319f
    |       |   |   `-- 8e3778c5-a8f7-4e6b-838f-2ec6bfbb319f.meta
    |       |   |-- e0a55d78-ba97-4412-89e9-65ab4d90657e
    |       |   |   |-- 6531941f-453d-40d3-9ed1-b83416b4a24b
    |       |   |   `-- 6531941f-453d-40d3-9ed1-b83416b4a24b.meta
    |       |   `-- fa390530-536b-4435-906a-4b7fde81be2e
    |       |       |-- b7820e65-ac41-4d89-ac18-7c17edefbd37
    |       |       |-- b7820e65-ac41-4d89-ac18-7c17edefbd37.meta
    |       |       |-- f400ef8c-9f2e-4f6c-aa68-6933c9965e1b
    |       |       `-- f400ef8c-9f2e-4f6c-aa68-6933c9965e1b.meta



=======================================================================================
after remove:
   |       |-- images
    |       |   |-- 323cc6d2-9ca7-4c2a-9f15-ce0dceffecfd
    |       |   |   |-- 3551ac7f-b8ae-475d-985f-42fdb8ece9ed
    |       |   |   `-- 3551ac7f-b8ae-475d-985f-42fdb8ece9ed.meta
    |       |   |-- 5654d919-57cc-4191-8c95-cbbdaae86da0
    |       |   |   |-- 73130d19-315f-4b9a-a587-f2ca6bef832d
    |       |   |   |-- 73130d19-315f-4b9a-a587-f2ca6bef832d.meta
    |       |   |   |-- cc6d3169-f6c1-4883-a230-e907d5f529f3
    |       |   |   `-- cc6d3169-f6c1-4883-a230-e907d5f529f3.meta
    |       |   |-- 7256c667-67bd-4f7b-831c-09a34cdb5341
    |       |   |   |-- 63d25749-7028-4310-825c-21ad8550f5a3
    |       |   |   `-- 63d25749-7028-4310-825c-21ad8550f5a3.meta
    |       |   |-- 87b22375-6194-421f-8f29-7e6235b698f6
    |       |   |   |-- 40f0e01b-245f-4392-87df-323196d4ad87
    |       |   |   `-- 40f0e01b-245f-4392-87df-323196d4ad87.meta
    |       |   |-- 8f539492-68df-4fb3-b670-1d5980d3e2d0
    |       |   |   |-- 0bc19895-2e10-4398-b940-25b2b76bc37f
    |       |   |   `-- 0bc19895-2e10-4398-b940-25b2b76bc37f.meta
    |       |   |-- a2d85350-6bdd-4bd3-84fb-babfa699e9fa
    |       |   |   |-- e9cc6664-fa20-4a84-9e10-6fbee025d691
    |       |   |   `-- e9cc6664-fa20-4a84-9e10-6fbee025d691.meta
    |       |   |-- ced369d3-ffc7-40f9-aa07-db6fb330b785
    |       |   |   |-- 14903ddf-2654-4a7c-a632-756b74d50f62
    |       |   |   |-- 14903ddf-2654-4a7c-a632-756b74d50f62.meta
    |       |   |   |-- 8e3778c5-a8f7-4e6b-838f-2ec6bfbb319f
    |       |   |   `-- 8e3778c5-a8f7-4e6b-838f-2ec6bfbb319f.meta
    |       |   |-- e0a55d78-ba97-4412-89e9-65ab4d90657e
    |       |   |   |-- 6531941f-453d-40d3-9ed1-b83416b4a24b
    |       |   |   `-- 6531941f-453d-40d3-9ed1-b83416b4a24b.meta
    |       |   `-- fa390530-536b-4435-906a-4b7fde81be2e
    |       |       |-- b7820e65-ac41-4d89-ac18-7c17edefbd37
    |       |       |-- b7820e65-ac41-4d89-ac18-7c17edefbd37.meta
    |       |       |-- f400ef8c-9f2e-4f6c-aa68-6933c9965e1b
    |       |       `-- f400ef8c-9f2e-4f6c-aa68-6933c9965e1b.meta

--- Additional comment from atal on 2012-02-08 12:09:33 EST ---

c8195f27-4bf6-44b5-9cda-4083bb1dc6d2::ERROR::2012-02-08 18:41:24,715::image::1107::Storage.Image::(merge) Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/image.py", line 1103, in merge
    chain = self.getSubChain(sdDom, imgUUID, ancestor, successor)
  File "/usr/share/vdsm/storage/image.py", line 848, in getSubChain
    childs = volclass.getAllChildrenList(self.repoPath, sdDom.sdUUID, imgUUID, volUUID)
  File "/usr/share/vdsm/storage/fileVolume.py", line 409, in getAllChildrenList
    if sdDom.produceVolume(imgUUID, volid).getParent() == pvolUUID:
  File "/usr/share/vdsm/storage/fileSD.py", line 160, in produceVolume
    return fileVolume.FileVolume(repoPath, self.sdUUID, imgUUID, volUUID)
  File "/usr/share/vdsm/storage/fileVolume.py", line 64, in __init__
    volume.Volume.__init__(self, repoPath, sdUUID, imgUUID, volUUID)
  File "/usr/share/vdsm/storage/volume.py", line 120, in __init__
    self.validate()
  File "/usr/share/vdsm/storage/volume.py", line 127, in validate
    self.validateVolumePath()
  File "/usr/share/vdsm/storage/fileVolume.py", line 542, in validateVolumePath
    raise se.VolumeDoesNotExist(self.volUUID)
VolumeDoesNotExist: Volume does not exist: ('e9cc6664-fa20-4a84-9e10-6fbee025d691',)






c8195f27-4bf6-44b5-9cda-4083bb1dc6d2::ERROR::2012-02-08 18:41:24,720::task::855::TaskManager.Task::(_setError) Task=`c8195f27-4bf6-44b5-9cda-4083bb1dc6d2`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 863, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/storage/task.py", line 320, in run
    return self.cmd(*self.argslist, **self.argsdict)
  File "/usr/share/vdsm/storage/securable.py", line 80, in wrapper
    return f(*args, **kwargs)
  File "/usr/share/vdsm/storage/sp.py", line 1732, in mergeSnapshots
    image.Image(repoPath).merge(sdUUID, vmUUID, imgUUID, ancestor, successor, postZero)
  File "/usr/share/vdsm/storage/image.py", line 1103, in merge
    chain = self.getSubChain(sdDom, imgUUID, ancestor, successor)
  File "/usr/share/vdsm/storage/image.py", line 848, in getSubChain
    childs = volclass.getAllChildrenList(self.repoPath, sdDom.sdUUID, imgUUID, volUUID)
  File "/usr/share/vdsm/storage/fileVolume.py", line 409, in getAllChildrenList
    if sdDom.produceVolume(imgUUID, volid).getParent() == pvolUUID:
  File "/usr/share/vdsm/storage/fileSD.py", line 160, in produceVolume
    return fileVolume.FileVolume(repoPath, self.sdUUID, imgUUID, volUUID)
  File "/usr/share/vdsm/storage/fileVolume.py", line 64, in __init__
    volume.Volume.__init__(self, repoPath, sdUUID, imgUUID, volUUID)
  File "/usr/share/vdsm/storage/volume.py", line 120, in __init__
    self.validate()
  File "/usr/share/vdsm/storage/volume.py", line 127, in validate
    self.validateVolumePath()
  File "/usr/share/vdsm/storage/fileVolume.py", line 542, in validateVolumePath
    raise se.VolumeDoesNotExist(self.volUUID)
VolumeDoesNotExist: Volume does not exist: ('e9cc6664-fa20-4a84-9e10-6fbee025d691',)

--- Additional comment from atal on 2012-02-08 12:10:45 EST ---

Created attachment 560318 [details]
engine log

--- Additional comment from atal on 2012-02-08 12:11:18 EST ---

vdsm-4.9.3.3-0.fc16.x86_64

--- Additional comment from ilvovsky on 2012-02-09 07:55:35 EST ---

It's a race between merges that we have on NFS setup.
Assume that we run several merges concurrently. 
When one of the merge processes rename merged volume as part of the algorithm, the second merge process can try to create this volumes as part of getAllChildrenList.

--- Additional comment from pm-rhel on 2012-02-12 04:41:40 EST ---

This bugzilla has Keywords: Regression or TestBlocker.

Since no regressions or test blockers are allowed between releases,
it is also being [proposed|marked] as a blocker for this release.

Please resolve ASAP.
Comment 2 Eduardo Warszawski 2012-05-01 11:02:16 UTC 
http://gerrit.ovirt.org/#change,3462
Comment 3 Oded Ramraz 2012-05-01 11:30:12 UTC 
Raising severity of this issue . Merge snapshot failure is not s low severity issue IMO and it leaves the user in a vague situation.