Re: [Xen-devel] Xen 4.11.1 panic

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.12.18 at 12:55, <bouyer@xxxxxxxxxxxxxxx> wrote:
> On Wed, Dec 19, 2018 at 04:05:57AM -0700, Jan Beulich wrote:
>> In any event, both Andrew and I must have overlooked the one
>> crucial place due to which the assertion is indeed wrong from
>> put_page_from_l2e():
>> 
>>         int rc = _put_page_type(pg, false, mfn_to_page(_mfn(pfn)));
>> 
>> Not allowing for preemption there is fine if the L2E is pointing to
>> an L1 table, but is now wrong if the L2E points to another L2,
>> which surely is the case when you see the assertion trigger.
> 
> Should we just change false to true here, or should the cases above be 
> handled differently ?

Switching from false to true here is just the initial part of the
necessary change - if you did just this, you'd end up hitting
the ASSERT() right after the line above. There's quite a bit
more to it, and it needs to be done pretty carefully.

Jan



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