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Re: [Xen-users] domU kernel crash after live migration on Debian 7.5



On Tue, 2015-01-27 at 16:08 +0100, John Naggets wrote:
> Did anyone see this behaviour already? What could be wrong here? Any
> clues would be appreciated and if you need more info simply ask.

Are these HVM or PV guests?

Are your physical machines all the same (e.g. processor)?

Are you doing any cpuid levelling at all?

> [  223.557790] invalid opcode: 0000 [#1] SMP
[...]
> [  223.557825] RIP: e030:[<ffffffff81243dbd>]  [<ffffffff81243dbd>] 
> arch_get_random_long+0x5/0x15

An interesting place to crash, not something I've ever seen before.

> [  223.558066] Code: 43 81 48 89 e9 48 89 df e8 13 e9 e8 ff 83 f8 01
>  19 d2 f7 d2 83 e2 f5 5b 5d 89 d0 41 5c c3 e8 d2 02 dd ff 66 90 c3 ba
> 0a 00 00 00 <48> 0f c7 f0 72 04 ff ca 75 f6 48 89 07 89 d0 c3 41 57

Interestingly "0f c7" (seen after the RIP at <48>) is the "rdrand"
instruction which is a newish instruction (sandybridge onwards). I
wonder if perhaps you've migrated to a machine which doesn't support it
for some reason (older processor, disabled in the bios, something else)?
That would certainly fit the symptoms.

Ian.



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