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[Xen-users] strange error from the kernel

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] strange error from the kernel
From: "Jia Rao" <rickenrao@xxxxxxxxx>
Date: Tue, 19 Aug 2008 17:09:58 -0400
Delivery-date: Tue, 19 Aug 2008 14:10:39 -0700
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Hi All,

Just from yesterday, I sometimes (twice since yesterday) get the following error from the kernel:

kernel : Ooops: 002 [1] SMP
kernel : CR2: 0000000000000170
kernel : Ooops: 002 [2] SMP
kernel : CR2: 0000000000000170
kernel : Ooops: 002 [3] SMP
kernel : CR2: 0000000000000170

FYI:
Box: Dell PowerEdge 1905 dual CPU
Xen: 3.1 from source
OS: CentOS 5.1 2.6.18.X86_64
CPUs: two Xeon E5450

I did not have any problem since yesterday, when I added another DomU. Previously I have two DomUs having no problem. The new domU was installed by copy one of the previous stable domU's disk image. Sure I modified the IP, MAC and other configurations.  The problem came out when there are 3 VMs running(not immediately, but after some arbitrary time).

Any ideas?
Is there a upper limit of the number of VMs on a host if xen is compiled from source? I know that the free XenoServer from Citrix has a limit of 4 VMs per host.

Thanks in advance,
Jia.

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