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Bug 1070905 - VMs with names longer than 48 characters can be created but not started
Summary: VMs with names longer than 48 characters can be created but not started
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: libvirt
Version: 6.5
Hardware: All
OS: All
high
high
Target Milestone: rc
: ---
Assignee: Jiri Denemark
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 1060557
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-02-27 17:07 UTC by Tom Lavigne
Modified: 2019-04-28 09:42 UTC (History)
22 users (show)

Fixed In Version: libvirt-0.10.2-29.el6_5.5
Doc Type: Bug Fix
Doc Text:
Cause: Sanlock has a 48 characters limit on lock owner name. Consequence: When sanlock locking driver is enabled in libvirt, domains with names longer than the limit could not be started. Fix: Since the owner name is not used by sanlock for anything but a more human friendly debugging output, libvirt truncates long domain names when sending them to sanlock so that they are shorter than 48 characters. Result: Domains with names longer than 48 characters can be successfully started even if sanlock locking driver is enabled.
Clone Of:
Environment:
Last Closed: 2014-03-06 09:33:22 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2014:0256 0 normal SHIPPED_LIVE libvirt bug fix update 2014-03-06 14:32:46 UTC

Description Tom Lavigne 2014-02-27 17:07:07 UTC 
This bug has been copied from bug #1060557 and has been proposed
to be backported to 6.5 z-stream (EUS).
Comment 4 Cui Lei 2014-02-28 07:49:54 UTC 
I can reproduce this issue with:
RHEVM 3.3.1-0.48.el6ev
libvirt-0.10.2-29.el6_5.4.x86_64

Create a vm with name "mhuizer_9123456789212345678931234567894123456789512111" which name length is longer than 48.

start the vm, from the event console, error message will pop up:

"VM mhuizer_9123456789212345678931234567894123456789512111 is down. Exit message: internal error internal error Domain name 'mhuizer_9123456789212345678931234567894123456789512111' exceeded 48 characters."
Comment 6 Cui Lei 2014-03-03 02:29:17 UTC 
Verified the issue with:
libvirt-0.10.2-29.el6_5.5.x86_64
libvirt-debuginfo-0.10.2-29.el6_5.5.x86_64
libvirt-lock-sanlock-0.10.2-29.el6_5.5.x86_64
libvirt-python-0.10.2-29.el6_5.5.x86_64
libvirt-client-0.10.2-29.el6_5.5.x86_64
libvirt-devel-0.10.2-29.el6_5.5.x86_64
RHEVM 3.3.1-0.48.el6ev

Use the same env as comment4,
Scenario A: vm with 54 char name.

1. In rhevm3.3, Start the vm with name "mhuizer_9123456789212345678931234567894123456789512111" (totally 55 char with '\0'), the vm could start successfully.

Console popup "VM mhuizer_9123456789212345678931234567894123456789512111 started on Host lcui-rhel65"

2. In host, # sanlock  status
daemon 450a307d-77a2-49c1-befb-88f422c91e49.lcui-rhel6
...
p 30559 mhuizer_912345678921234567893123456789412345678
...

The owner_name part have been truncated as 48 chars by design.


Scenario B: vm with a normal name shorter than 48
1. In rhevm3.3, Start the vm with name "lcui_rhel_test"
VM start successfully and console popup:	
VM lcui_rhel_test was started by admin@internal (Host: lcui-rhel65).

2. In host, # sanlock  status
...
p 30559 mhuizer_912345678921234567893123456789412345678
p 29995 
p 32720 lcui_rhel_test
...

New VM name displayed with the full name as it is shorter than 48

Scenario C: create a vm with name longer than 48 in KVM.
The vm could start successfully.

As above all, change the status from 'ON_QA' to 'VERIFIED'
Comment 8 errata-xmlrpc 2014-03-06 09:33:22 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.

http://rhn.redhat.com/errata/RHBA-2014-0256.html
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