RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
Bug 1334237 - Dump a guest with long domain name by watchdog failed
Summary: Dump a guest with long domain name by watchdog failed
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.3
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: ---
Assignee: Martin Kletzander
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-05-09 09:05 UTC by Fangge Jin
Modified: 2016-11-03 18:45 UTC (History)
4 users (show)

Fixed In Version: libvirt-2.0.0-1.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-11-03 18:45:04 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2577 0 normal SHIPPED_LIVE Moderate: libvirt security, bug fix, and enhancement update 2016-11-03 12:07:06 UTC

Description Fangge Jin 2016-05-09 09:05:14 UTC 
Description of problem:
Prepare a guest with long name(248-character), try to get guest dump file by watchdog, but no dump file is generated due to file name too long:
2016-05-05 15:20:37.466+0000: 3440: error : qemuOpenFileAs:3076 : Failed to create file '/var/lib/libvirt/qemu/dump/1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111-1462461637': File name too long
2016-05-05 15:20:37.466+0000: 3440: error : processWatchdogEvent:3946 : operation failed: Dump failed

Version-Release number of selected component (if applicable):
libvirt-1.3.4-1.el7

How reproducible:
100%

Steps:
1.Prepare a guest with 248-character in domain name and with watchdog device:
virsh # dumpxml 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
...
    <watchdog model='i6300esb' action='dump'>
      <alias name='watchdog0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/>
    </watchdog>
...

2.In guest:
#echo 1>/dev/watchdog

Wait 30s, check dump file
# ll /var/lib/libvirt/qemu/dump/
(no dump file is generated)

3.There is error log in libvirtd.log:
2016-05-05 15:20:37.466+0000: 3440: error : qemuOpenFileAs:3076 : Failed to create file '/var/lib/libvirt/qemu/dump/1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111-1462461637': File name too long
2016-05-05 15:20:37.466+0000: 3440: error : processWatchdogEvent:3946 : operation failed: Dump failed

Actual results:
Dump guest by watchdog failed when domain has a long name

Expected results:
Dump guest by watchdog successfully.

Additional info:
Comment 2 Martin Kletzander 2016-06-13 14:35:42 UTC 
Patch posted upstream:

https://www.redhat.com/archives/libvir-list/2016-June/msg00776.html
Comment 3 Martin Kletzander 2016-06-16 14:43:29 UTC 
Fixed upstream with v1.3.5-278-gab74f60a3668:
commit ab74f60a3668c401ff812ff0beb38f34bf4dcc6b
Author: Martin Kletzander <mkletzan>
Date:   Mon Jun 13 16:28:06 2016 +0200

    qemu: Shorten domain name for watchdog coredump
Comment 5 yafu 2016-07-26 02:39:24 UTC 
Reproduced with libvirt-1.3.4-1.el7.
Steps are as comment0.

Verify pass with libvirt-2.0.0-3.el7.x86_64.
Test steps:
1.Prepare a guest with 248-character in domain name and with watchdog device:
virsh # dumpxml 1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
...
    <watchdog model='i6300esb' action='dump'>
      <alias name='watchdog0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x0c' function='0x0'/>
    </watchdog>
...

2.In guest:
#echo 1>/dev/watchdog

3.Wait 30s, check dump file, could see dump file create correctly:
#ll /var/lib/libvirt/qemu/dump/
-rw-------. 1 root root 1822568040 Jul 26 09:59 6-11111111111111111111-2016-07-26-09:59:37
Comment 7 errata-xmlrpc 2016-11-03 18:45:04 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/RHSA-2016-2577.html
Note You need to log in before you can comment on or make changes to this bug.