[Xen-devel] Re: Linux-XenU kernel panic in allocs after live migration

[Teemu Koponen <tkoponen@xxxxxx>]

On May 10, 2005, at 0:04, Teemu Koponen wrote:

> While testing the live migration I run into a Linux-xenU kernel panic 
> that is basically a show stopper. So far I have tested both with 2.0.5 
> and testing that is a few days old. It seems that (all?) kernel allocs 
> after live migration fail as  e.g. ping started before migration still 
> runs stable after migration, but on the other hand starting a new 
> instance of ping results in a panic. Process crash stack traces, the 
> kernel throws to the console, seem always to end a kernel alloc, 
> version or another. Regular save and restore for xenU work fine.
> My setup is a vanilla "xen-make-world" with the exception that I 
> enabled devfs support for the xenU. Moreover, compressed ram disk 
> support is compiled in, but the panics occur with cramfs ramdisks and 
> regular ext2fs ramdisks. My xenU mounts its root over NFS.
> Is this a SUE, a feature, or a bug? :-)
I wonder how sensitive Linux kernel is to underlying CPU changes, even 
though it is compiled to support only of a certain type CPU? In this 
specific case I'm trying to migrate between Athlon XP and Pentium-M 
domain-0 hosts, with a Linux domain-U kernel that is compiled to 
support Pentium-MMX class processor. Is this really a dead-end 
(translation: SUE) or should it work as I initially assumed?
Teemu

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