Re: [Xen-devel] error in xen/arch/x86/mm.c:get_page during migration

[Tim Deegan <tim@xxxxxxx>]

At 14:06 +0000 on 28 Feb (1362060411), Jan Beulich wrote:
> Problem is that the domain reported in the message is DOM_COW
> according to Olaf, yet he's not knowingly using page sharing.

Oh.  In that case, a backtrace (e.g. from WARN()) in the offending call
would be enlightening. 

> But that fact pretty much excluded the grant table or any other of the
> "usual" code paths for me (and I never looked at the sharing code, so
> hoped one of you two would).

I just looked thorough it for unguarded typecount modifications and
didn't find one.  But presumably something else is wrong if we're
trying to unshare a page with no sharing enabled.

Tim.

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