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Bug 1453194 - Guest with 247-characters name-length failed to start
Summary: Guest with 247-characters name-length failed to start
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.4
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Martin Kletzander
QA Contact: Fangge Jin
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-05-22 11:22 UTC by Fangge Jin
Modified: 2018-04-10 10:46 UTC (History)
8 users (show)

Fixed In Version: libvirt-3.7.0-1.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-04-10 10:44:33 UTC
Target Upstream Version:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2018:0704 0 None None None 2018-04-10 10:46:10 UTC

Description Fangge Jin 2017-05-22 11:22:46 UTC 
Description of problem:
Guest with 248-characters name-length failed to start

Version-Release number of selected component:
libvirt-3.2.0-5.virtcov.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.Prepare a guest with 248-characters name-length:
# virsh list --all
 Id    Name                           State
----------------------------------------------------
 -     1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 shut off

2. Start guest:
# virsh start 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
error: Failed to start domain 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
error: internal error: Process exited prior to exec: libvirt: QEMU Driver error : Failed to create /var/run/libvirt/qemu/1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111.hugepages: File name too long

3.An empty dir $guest.dev is left in /var/lib/libvirt/qemu/
# ls /var/run/libvirt/qemu/
1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111.dev

Actual results:
Guest failed to start

Expected results:
Guest can start successfully.

Additional info:
Same guest can start successfully on RHEL7.3
Comment 3 Martin Kletzander 2017-08-23 11:56:26 UTC 
Patch proposed upstream:

https://www.redhat.com/archives/libvir-list/2017-August/msg00635.html
Comment 4 Martin Kletzander 2017-08-29 09:27:53 UTC 
Fixed upstream with v3.6.0-230-gf5ef291bdb2c:
commit f5ef291bdb2c7616f342efc20e2322e48c038eca
Author: Martin Kletzander <mkletzan>
Date:   Wed Aug 23 10:39:57 2017 +0200

    qemu: Use short domain name in qemuDomainGetPreservedMountPath
Comment 6 Fangge Jin 2017-10-24 03:08:03 UTC 
Verify with libvirt-3.8.0-1.virtcov.el7.x86_64, guest starts successfully with the long name
Comment 10 errata-xmlrpc 2018-04-10 10:44:33 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/RHEA-2018:0704
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