[Fedora-xen] File operation causes kernel panic

Alex.Upton at instinet.com Alex.Upton at instinet.com
Wed Apr 26 17:25:18 UTC 2006


I recently experienced the same issue and noticed that it was related to
my snmpd flipping out. 

I'm not sure if its just a buggy version of snmpd that ships with FC5 or
if it's an overall issue with SNMPD and virtualized environments.

Disabling snmpd resolved it for me, however I'm hoping this issue is
resolved some day. 

Hope this helps.
-Alex
-----Original Message-----
From: fedora-xen-bounces at redhat.com [mailto:fedora-xen-bounces at redhat.com]
On Behalf Of EJacobsh at connectknowledge.com
Sent: Wednesday, April 26, 2006 1:17 PM
To: fedora-xen at redhat.com
Subject: [Fedora-xen] File operation causes kernel panic

Hello,
I'm having a problem with a Dell server (PowerEdge 2850) and a recently
installed Fedora Core 5 with Xen kernel (2.6.16-1.2096_FC5xen0).  Whenever
I try to copy a larger file (128MB) to the server over the network, the
server crashes (register dump on the console, remote sessions stop
responding).

This happens consistently with Anaconda, Samba and WinSCP3.  It has
happened with yum twice, although it works most of the time.

When I reboot the server with a kernel that does not include Xen
(2.6.16-1.2096_FC5), the copying works.

I need some help figuring out what my next steps should be.  I don't see
anything unusual in the xend.log (see below).  The xend-debug.log is
empty.  Is there some other place I should look?  Are there any other
diagnostic tools to use?

Thanks for you help.

Eric Jacobshagen
CONNECT: The Knowledge Network

xend.log:

[xend] INFO (SrvDaemon:285) Xend Daemon started [xend] INFO
(SrvDaemon:289) Xend changeset: unavailable .
[xend.XendDomainInfo] DEBUG (XendDomainInfo:199)
XendDomainInfo.recreate({'paused': 0, 'cpu_time': 24271818792L, 'ssidref':

0, 'handle': [0, 0, 0, 0, 0, 0, 0, 0, 0, , 0, 0, 0, 0, 0, 0],
'shutdown_reason': 0, 'dying': 0, 'dom': 0, 'mem_kb': 524288, 'maxmem_kb':

-4, 'max_vcpu_id': 1, 'crashed': 0, 'running': 1, 'shutdown': 0,
'online_vcpus': 2, 'blocked': 0})
[xend.XendDomainInfo] INFO (XendDomainInfo:211) Recreating domain 0, UUID
00000000-0000-0000-0000-000000000000.
[xend.XendDomainInfo] WARNING (XendDomainInfo:233) No vm path in store for
existing domain 0 [xend.XendDomainInfo] DEBUG (XendDomainInfo:667) Storing
VM details: 
{'ssidref': '0', 'uuid': '00000000-0000-0000-0000-000000000000',
'on_reboot': 'restart', on_poweroff': 'destroy', 'name': 'Domain-0',
'vcpus': '2', 'vcpu_avail': '3', 'memory': '512', 'on_crash': 'restart',
'maxmem': '512'}
[xend.XendDomainInfo] DEBUG (XendDomainInfo:692) Storing domain details: 
{'cpu/0/availability': 'online', 'memory/target': '524288',
'cpu/1/availability': 'online', 'name': 'Domain-0', 'console/limit': 
'1048576', 'vm': '/vm/00000000-0000-0000-0000-000000000000', 'domid':'0'}
[xend] DEBUG (XendDomain:151) number of vcpus to use is 0 [xend] INFO
(SrvServer:114) unix path=/var/lib/xend/xend-socket

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