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Re: [Xen-users] dev/xen/evtchn disappears, HVM fails, xen 4.0.1-1 Debian

To: "Fajar A. Nugraha" <list@xxxxxxxxx>
Subject: Re: [Xen-users] dev/xen/evtchn disappears, HVM fails, xen 4.0.1-1 Debian Squeeze
From: Erik Hjelmås <erik.hjelmas@xxxxxxxxx>
Date: Wed, 22 Sep 2010 05:41:01 +0200
Cc: Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
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2010/9/20 Fajar A. Nugraha <list@xxxxxxxxx>
2010/9/20 Erik Hjelmås <erik.hjelmas@xxxxxxxxx>:
> Thanks for the reply Fajar,
>> > debian packages, everything installed using aptitude) was working fine
>> > for
>> > PV and HVM guest until an aptitude upgrade on Monday,
>> Was it also 4.0.1, or 4.0.0 (before aptitude upgrade)?
> it was also 4.0.1 but a release candidate (RC6):

In that case, the easy way is to downgrade using the working package :)
I'd start with downgrading the kernel first, then if doesn't work,
start with other packages. Or compile yourself from source.

I had only attempted downgrading xen last week, yesterday I started downgrading DomO kernels from

and downgrading to 2.6.32-20 did not help, 2.6.32-19 did not help, but finally with 2.6.32-18 from july the problem disappeared.

I think this is very strange, but I have to keep the server running this way until Monday, then I will try to recreate the error and potentially file a bug report at Debian.

btw with this kernel, there's no gntdev in /dev/xen :

erikh@zimbu:~$ ls -l /dev/xen/
total 0
crw------- 1 root root 10, 57 Sep 21 05:44 evtchn


I have a xen 4.0.1 environment, which (for most part) works as
expected, and not having your problems. So I'd suggest you also ask
Debian guys.


> zimbu:/var/cache/apt/archives# ls -ltr *xen-hypervisor*
> -rw-r--r-- 1 root root 687128 Aug 17 23:32
> xen-hypervisor-4.0-amd64_4.0.1~rc6-1_amd64.deb
> -rw-r--r-- 1 root root 687022 Sep  3 18:32
> xen-hypervisor-4.0-amd64_4.0.1-1_amd64.deb
> zimbu:/var/cache/apt/archives#
>> > zimbu:/home/erikh# dpkg -l | grep xen
>> > libxenstore3.0                      4.0.1-1
>> > linux-image-2.6.32-5-xen-amd64      2.6.32-21
>> > xen-hypervisor-4.0-amd64            4.0.1-1
>> > xen-linux-system-2.6.32-5-xen-amd64 2.6.32-21
>> > xen-qemu-dm-4.0                     4.0.1-1
>> > xen-tools                           4.2~rc1-1
>> > xen-utils-4.0                       4.0.1-1
>> > xen-utils-common                    4.0.0-1
>> > xenstore-utils                      4.0.1-1
>> AFAIK you usually need a matching version of hypervisor and tools.
>> Your tools version says 4.2~rc1-1, while hypervisor is 4.0.1-1. That
>> might be the cause.
> yes, I was thinking this as well, but I dont think it applies to the
> xen-tools (only to xen, xenstore, and corresponding utils packages) and it
> doesnt look like there has been a 4.0.1 version of xen-tools either
> http://packages.debian.org/changelogs/pool/main/x/xen-tools/xen-tools_4.2~rc1-1/changelog
> /Erik

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