From mboxrd@z Thu Jan  1 00:00:00 1970
From: Muriel <mucawhite@gmail.com>
Subject: VM hangs after live migration
Date: Wed, 12 Jan 2011 10:41:44 +0100
Message-ID: <4D2D7758.8050203@gmail.com>
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Hi all,
i'm not sure that this is the right place to write but i hope you can 
help me.
I have many vm on Xenserver 5.5 and starting with kernel 2.6.32.15 i had 
many problems with the live migration:
- with 2.6.32.16 and higher the vm hang after migration (no console output)
- 2.6.32.26 and higher have this kernel bug:
kernel BUG at /build/buildd/linux-2.6.32/arch/x86/xen/spinlock.c:343!
invalid opcode: 0000 [#1] SMP

After some research on the mailing list i tried to apply this patch:
http://xen.1045712.n5.nabble.com/PATCH-xen-events-do-not-unmask-polled-ipis-on-restore-td3241695.html
to the kernel 2.6.32.27 and now:
- when i try to migrate the vm from a member of the pool to another 
everything works fine;
- when i try to migrate the vm from a member of the pool to the master 
the vm hangs (exactly as the 2.6.32.16).

Any suggestions?

Muriel