Re: [Xen-devel] linux-4.7.* under xen-4.6.* gives "unhandled page fault (ec=0000)" at boot. -- Root cause found.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.08.16 at 16:26, <konrad.wilk@xxxxxxxxxx> wrote:
> On Mon, Aug 29, 2016 at 05:04:05AM -0600, Jan Beulich wrote:
>> >>> On 29.08.16 at 01:14, <hakon@xxxxxxxxxxxxxxxxxx> wrote:
>> 
>> First of all - please don't cross post.
>> 
>> > Den 17. aug. 2016 21:56, I wrote (to xen-users, as I am no developer):
>> >> I'm on gentoo, running gentoo-sources kernel for dom0.
>> >>
>> >> I am unable to run gentoo-sources-4.7.{0,1}. I'm running under xen,
>> >> currently at 4.6.3-r1
>> > 
>> > I am now on linux gentoo-sources-4.7.2, and the bug is stil present.
>> > 
>> > I have done some digging on my own, and found that protecting two 
>> > instances 
> 
>> > of " for_each_efi_memory_desc(md) {" with something like "if( 
> efi.memmap.map 
>> > != NULL) {" will allow my dom0 to boot and run.
>> 
>> Which is basically the equivalent of e.g.
>> 
>> http://lkml.iu.edu/hypermail/linux/kernel/1608.2/03448.html 
> 
> It does not look like it was ever applied?

Afaik it's on its (admittedly slow) way to Linus.

Jan


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