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Bug 1196528 - Libvirtd crashes when a storage file backed by gluster protocol lacking path
Summary: Libvirtd crashes when a storage file backed by gluster protocol lacking path
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.1
Hardware: x86_64
OS: Linux
high
high
Target Milestone: rc
: ---
Assignee: Peter Krempa
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1198720
TreeView+ depends on / blocked
 
Reported: 2015-02-26 07:49 UTC by Yang Yang
Modified: 2015-11-19 06:17 UTC (History)
6 users (show)

Fixed In Version: libvirt-1.2.13-1.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1198720 (view as bug list)
Environment:
Last Closed: 2015-11-19 06:17:58 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:2202 0 normal SHIPPED_LIVE libvirt bug fix and enhancement update 2015-11-19 08:17:58 UTC

Description Yang Yang 2015-02-26 07:49:38 UTC 
Description of problem:
Libvirtd crashes when a storage file backed by gluster://$IP lacking path

Version-Release number of selected component (if applicable):
qemu-img-rhev-2.1.2-23.el7_1.1.x86_64
kernel-3.10.0-229.el7.x86_64
libvirt-1.2.8-16.el7_1.1.x86_64

How reproducible:
100%

Steps to Reproduce:
1. create a qcow2 file
# qemu-img create -f qcow2 /var/lib/libvirt/images/gluster.img 100M
Formatting '/var/lib/libvirt/images/gluster.img', fmt=qcow2 size=104857600 encryption=off cluster_size=65536 lazy_refcounts=off 

2. rewrite the qcow2 file to use gluster protocol lacking path as backend 
# qemu-img rebase -u -f qcow2 -F raw -b gluster://10.66.4.164 /var/lib/libvirt/images/gluster.img 

3.# qemu-img info /var/lib/libvirt/images/gluster.img
image: /var/lib/libvirt/images/gluster.img
file format: qcow2
virtual size: 100M (104857600 bytes)
disk size: 196K
cluster_size: 65536
backing file: gluster://10.66.4.164
backing file format: raw
Format specific information:
    compat: 1.1
    lazy refcounts: false

4. refresh default pool
# virsh pool-refresh default
error: Failed to refresh pool default
error: End of file while reading data: Input/output error
error: Failed to reconnect to the hypervisor

Actual results:
Libvirtd crashes

Expected results:


Additional info:
Comment 1 Peter Krempa 2015-02-26 12:27:54 UTC 
Fixed upstream:

Author: Peter Krempa <pkrempa>
Date:   Thu Feb 26 10:28:21 2015 +0100

    util: storagefile: Don't crash on gluster URIs without path
    
    Similar to commit fdb80ed4f6563928b9942a0d1450e0c725aa6c06 libvirtd
    would crash if a gluster URI without path would be used in the backing
    chain of a volume. The crash happens in the gluster specific part of the
    parser that extracts the gluster volume name from the path.
    
    Fix the crash by checking that the PATH is NULL.
Comment 3 Yang Yang 2015-03-31 09:25:16 UTC 
Verify it using libvirt-1.2.13-1.el7.x86_64

Steps:
1. create a qcow2 file
# qemu-img create -f qcow2 /var/lib/libvirt/images/gluster.img 100M
Formatting '/var/lib/libvirt/images/gluster.img', fmt=qcow2 size=104857600 encryption=off cluster_size=65536 lazy_refcounts=off 

2. rewrite the qcow2 file to use gluster protocol lacking path as backend 
# qemu-img rebase -u -f qcow2 -F raw -b gluster://10.66.4.164 /var/lib/libvirt/images/gluster.img 

3.# qemu-img info /var/lib/libvirt/images/gluster.img
image: /var/lib/libvirt/images/gluster.img
file format: qcow2
virtual size: 100M (104857600 bytes)
disk size: 196K
cluster_size: 65536
backing file: gluster://10.66.4.164
backing file format: raw
Format specific information:
    compat: 1.1
    lazy refcounts: false

4. # ps -ef |grep libvirt
root      1067     1  0 17:04 ?        00:00:00 /usr/sbin/libvirtd

5. # virsh pool-refresh default
error: Failed to refresh pool default
error: unsupported configuration: missing volume name and path for gluster volume

6. # ps -ef |grep libvirt
root      1067     1  0 17:04 ?        00:00:00 /usr/sbin/libvirtd

Libvirt does not crash again.
Comment 5 Yang Yang 2015-05-14 09:48:41 UTC 
Set it to verified status according to comment #3
Comment 7 errata-xmlrpc 2015-11-19 06:17:58 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-2015-2202.html
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