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Re: [Xen-devel] HVM domains crash after upgrade from XEN 4.5.1 to 4.5.2

Am 15.11.15 um 16:12 schrieb Andrew Cooper:
[big snip]
Great - so confirms the issue as a SeaBIOS interaction issue, rather than a hypervisor regression.

As I said before, I am still certain that a guest should not be able to get itself into the crashing state (short of a hardware errata), so I still suspect that there is a latent hypervisor emulation bug which has been tickled by the SeaBIOS update.

Would you please mind running the bad HVMLoader on Xen 4.5.2 with hvm_debug=0xc3f ? I am still hoping that that will shed some light on SeaBIOS actions just leading up to the crash.
Hi Andrew,
Please see the attached two files. One is the dmesg from booting the system. This looks pretty normal in my view. The other is the output of "xl dmesg" which is most likely what you were after. It's probably worth noting that the "traps.c" output between lines 259 and 314 and again between lines 346 and 353 seem to be xen-4.5.2 specific and don't show up under xen-4.5.1, but that may not be of any relevance for the SeaBIOS issue we are experiencing. Though I'd still be interested to know whether that's anything for me to worry about ...

Are you able to experiment with newer versions of Xen?  It would be interesting to see whether the issue is still present in Xen 4.6
Currently xen-4.6 is not stable in gentoo and I try to stick to stable packages as much as possible. But in case the above does not help you any further, I am happy to give this a try as well. Would this just be a straightforward test to see whether it works at all or would you require debug symbols as well?

Many thanks again and best regards Atom2

Attachment: dmesg
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Attachment: xl.dmesg
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