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Re: [Xen-devel] Xen BUG at page_alloc.c:1738 (Xen 4.5)

On Wed, 20 May 2015, Major Hayden wrote:

> On 05/20/2015 05:41 AM, Jan Beulich wrote:
> > Considering that no-one else is seeing this - is this perhaps connected
> > to you building Xen with pre-release gcc 5.0.1? This is also because in
> > order for the above to indeed occur, mmio_ro_do_page_fault()'s
> > put_page() would need to drop the last reference of a page, yet
> > page_get_owner_and_reference() doesn't obtain a reference when
> > a page is unallocated (and hence unowned), i.e. normally a page
> > would have a refcount of at least 2 here. Hence this would be
> > possible only due to a race, but the exact same race to be observed
> > on different hardware _and_ under an emulator is extremely unlikely.

You could try with the xen.gz file from 
It is roughly the same version of xen but built against Fedora 21 and gcc 
4.9.2. If that works then it probably is gcc 5.

        Michael Young

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