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

[Major Hayden <major@xxxxxxxx>]

Hello there,

I've been doing some testing of Xen 4.5 on Fedora 22 (due out within a week) 
and I have an error that prevents the server from booting in the very early 
boot process:

> (XEN) Xen call trace:
> (XEN)    [<ffff82d08011d160>] free_domheap_pages+0x240/0x430
> (XEN)    [<ffff82d08018c944>] mmio_ro_do_page_fault+0x114/0x160
> (XEN)    [<ffff82d0801a4c10>] do_page_fault+0x1a0/0x4f0
> (XEN)    [<ffff82d080239768>] handle_exception_saved+0x2e/0x6c
> (XEN) 
> (XEN) 
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Xen BUG at page_alloc.c:1738
> (XEN) ****************************************

The full output is over in a Github Gist[1].

I've tested this on some physical machines (Dell, HP, and SuperMicro servers) 
as well as within a KVM virtual machine but I get the same boot error each 
time.  It occurs with Xen 4.5 and Linux 3.17-4.0.x.  Xen 4.5.1-rc1 fails in the 
same way.  I've opened a Red Hat Bug[2] as well as a Xen bug[3] on it.

The code within free_domheap_pages() hasn't changed much since late 2014 so I'm 
not sure if that's the culprit.  Does anyone have any suggestions on how to 
debug it further?

Thanks in advance!

[1] https://gist.github.com/major/baa0e2eee7de51a2bcd1
[2] https://bugzilla.redhat.com/show_bug.cgi?id=1219197
[3] http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1908

--
Major Hayden

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