[Pkg-xen-devel] Bug#557098: xen-hypervisor-3.2-1-amd64: Using vcpus=2 causes the guest to hang after some time

[Imran Chaudhry]

Package: xen-hypervisor-3.2-1-amd64
Version: 3.2.1-2
Severity: normal

I have a dual-core host. I wanted to give one of my guests use of 2 vcpus and use of both real cpus.

I had the following in my config file for the guest:

vcpus = 2
cpus = 0,1

This appeared to work correctly and I saw a big difference in the load average (the guest is monitored by munin-node).

However after 12 hours or so, the guest simply stopped responding and froze. I saw nothing obvious in the sar system activity report, the xend log, the guest logs, guest syslog etc. It just froze at a localtime between 0647 and 0650 (if thats significant?).

A quick Google found a few reports of the same issue but I did not go into more details. I reverted to the default of vcpu=1 and no trouble has been had.



-- System Information:
Debian Release: 5.0.3
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-2-xen-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB, LC_CTYPE=en_GB (charmap=ISO-8859-1)
Shell: /bin/sh linked to /bin/bash

xen-hypervisor-3.2-1-amd64 depends on no packages.

Versions of packages xen-hypervisor-3.2-1-amd64 recommends:
ii  xen-utils-3.2-1               3.2.1-2    XEN administrative tools

Versions of packages xen-hypervisor-3.2-1-amd64 suggests:
pn  xen-docs-3.2                  <none>     (no description available)

-- no debconf information