Regression warning about 4.4.17+18 / 4.6.7 / 4.7+ and Xen

Stefan Bader stefan.bader at
Mon Aug 22 13:28:51 UTC 2016

On 22.08.2016 15:18, Tim Gardner wrote:
> On 08/22/2016 04:07 AM, Stefan Bader wrote:
>> There has been a recent (maybe not that recent, it was in 4.7) kernel regression
>> for Xen which made its way back to several stable trees[1]:
>>   xenbus: don't BUG() on user mode induced condition
>> It appears there is a fix on patchworks[2] but as of today was not included, yet
>> in upstream Linux.
>> For Yakkety the regression is part of the 4.6.0-11 unstable package. For Xenial
>> it is part of the pending next SRU cycle (master-next). I did a quick test with
>> the proposed patch on top of 4.6 in yakkety/master-next and it allowed me to
>> starts VMs again. Not sure whether we want to pick that additional patch or back
>> out the stable change introducing the problem. But either way the master-next
>> branches of both Xenial and Yakkety will cause a Xen regression as they are now.
>> The effect is that tools like xenstore-ls or xenstore-write no longer work and
>> it is no longer possible to start any VMs.
>> -Stefan
>> [1]
>> [2]
> Looks like we should apply the one liner patchworks patch.
Sounds sensible, yes. For Xenial there is hope that by next week maybe the fix
went upstream for picking. The warning is also intended as a marker, so we do
not forget to look at this.


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