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Bug 1186989

Summary:	RHEV: Cannot start VMs that have more than 98 snapshots.
Product:	Red Hat Enterprise Linux 7	Reporter:	Shaolong Hu <shu>
Component:	qemu-kvm-rhev	Assignee:	Jeff Cody <jcody>
Status:	CLOSED DUPLICATE	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.2	CC:	amureini, dyuan, hhuang, juzhang, michen, mzhan, nsoffer, shyu, tnisan, virt-maint, xuzhang
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	1117170	Environment:
Last Closed:	2016-03-23 19:26:51 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:

Comment 1 Shaolong Hu 2015-01-29 05:21:58 UTC

Here is the key information:

Test on qemu-kvm-rhev-2.1.2-23.el7.x86_64:

with script https://bugzilla.redhat.com/attachment.cgi?id=867573:

with default script:

# ./test.sh 
Formatting 'base.qcow2', fmt=qcow2 size=1073741824 encryption=off cluster_size=65536 lazy_refcounts=off 
Performing live snapshot test
-----------------------------
Waiting to connect to qmp socket...
./test.sh: connect: Connection refused
./test.sh: line 44: /dev/tcp/localhost/44444: Connection refused
connected!
snapshot-0: success!
snapshot-1: success!
snapshot-2: success!
snapshot-3: success!
snapshot-4: success!
...
snapshot-77: success!
snapshot-78: success!
snapshot-79: success!

Performing qemu-img snapshot test
---------------------------------
snapshot-0: success!
snapshot-1: success!
snapshot-2: success!
snapshot-3: success!
...
snapshot-78: success!
snapshot-79: success!

Killing qemu process (28807)....
done, left directory this-is-a-test-dir-for-snapshots-28803 intact


in script, modify MAX_SNAPSHOTS from 80 to 99, test failed when creating qimg-snapshot-98.qcow2 with qemu-img, try to test manually:

1. qimg-snapshot-97.qcow2 is good:

[root@localhost this-is-a-test-dir-for-snapshots-28270]# qemu-img create -f qcow2 qimg-snapshot-97.qcow2 -b ../this-is-a-test-dir-for-snapshots-28270/qimg-snapshot-96.qcow2
Formatting 'qimg-snapshot-97.qcow2', fmt=qcow2 size=1073741824 backing_file='../this-is-a-test-dir-for-snapshots-28270/qimg-snapshot-96.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off 

2. qimg-snapshot-98.qcow2 report error(just one error, but very long):

[root@localhost this-is-a-test-dir-for-snapshots-28270]# qemu-img create -f qcow2 qimg-snapshot-98.qcow2 -b ../this-is-a-test-dir-for-snapshots-28270/qimg-snapshot-97.qcow2

qemu-img: qimg-snapshot-98.qcow2: Could not open '../this-is-a-test-dir-for-snapshots-28270/qimg-snapshot-97.qcow2': Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open backing file: Could not open '../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir-for-snapshots-28270/../this-is-a-test-dir': No such file or directory: No such file or directory

Comment 2 Shaolong Hu 2015-01-29 05:23:47 UTC

As Jeff's comment:
https://bugzilla.redhat.com/show_bug.cgi?id=1117170#c9

File this bug for future fix

Comment 7 Jeff Cody 2016-03-23 19:09:27 UTC

I ran the test script on the upstream code (qemu master), and we still have the same issue.

Comment 8 Jeff Cody 2016-03-23 19:26:51 UTC


*** This bug has been marked as a duplicate of bug 1082630 ***