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Bug 1557206 - [Regression] Cannot delete VM's snapshot [rhel-7.5.z]
Summary: [Regression] Cannot delete VM's snapshot [rhel-7.5.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm-ma
Version: 7.5
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Fam Zheng
QA Contact: yilzhang
Jiri Herrmann
URL:
Whiteboard:
Depends On: 1554650
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-03-16 07:58 UTC by Oneata Mircea Teodor
Modified: 2018-05-15 15:28 UTC (History)
28 users (show)

Fixed In Version: qemu-kvm-ma-2.10.0-21.el7_5.2
Doc Type: Bug Fix
Doc Text:
Under certain circumstances, snapshots of guests created in Red Hat Enterprise Linux (RHEL) could not be deleted due to an error in the snapshot locking mechanism. This update fixes RHEL snapshot locking, and the affected snapshots can now be removed as expected.
Clone Of: 1554650
Environment:
Last Closed: 2018-05-09 15:07:32 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:1368 0 None None None 2018-05-09 15:07:43 UTC

Description Oneata Mircea Teodor 2018-03-16 07:58:46 UTC 
This bug has been copied from bug #1554650 and has been proposed to be backported to 7.5 z-stream (EUS).
Comment 3 Miroslav Rezanina 2018-04-13 09:30:27 UTC 
Fix included in qemu-kvm-ma-2.10.0-21.el7_5.2
Comment 5 yilzhang 2018-04-18 09:26:47 UTC 
This bug can be reproduced with qemu-img-ma-2.10.0-20.el7
Reproduce Steps:
1. Create a qcow2 image - base.qcow2
   # qemu-img create -f qcow2 base.qcow2 22G 

2. Create a child of the base image:
   # qemu-img create -f qcow2 -b base.qcow2 child1.img 22G 

3. Run a qemu process that uses child1 image

4. Create another child of the base image:
   # qemu-img create -f qcow2 -b base.qcow2 child2.img 22G 

5. Create a child of child2 image:
   # qemu-img create -f qcow2 -b child2.img child2_2.img 22G 

6. Commit child2_2 into child2
   # qemu-img commit -p -t none -b child2.img child2_2.img
    (0.00/100%)
qemu-img: Failed to get "write" lock
Is another process using the image?

Actual Results: Step #6 fails


####
And this bug is verified against qemu-kvm-ma-2.10.0-21.el7_5.2
Host kernel: 3.10.0-862.el7.ppc64le (Power8)

Verify Steps: the same as Reproduce Steps
Actual Results: Step #6 succeeds, output is like following:
# qemu-img commit -p -t none -b child2.img child2_2.img
    (100.00/100%)
Image committed.


Besides, I also ran the following two tests to verify this bug:
1. All the cases in https://bugzilla.redhat.com/show_bug.cgi?id=1554946#c8 , and all passed
2. qemu-img related cases from polarion, NO failed cases found


Based on this, set this bug as verified.
Comment 10 errata-xmlrpc 2018-05-09 15:07:32 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://access.redhat.com/errata/RHBA-2018:1368
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