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

[M A Young <m.a.young@xxxxxxxxxxxx>]

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 
https://copr-be.cloud.fedoraproject.org/results/myoung/xentest/fedora-21-x86_64/xen-4.5.1-0.rc1.fc21/xen-hypervisor-4.5.1-0.rc1.fc21.x86_64.rpm
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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel