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Re: [Xen-devel] some recent xen kernel bugs in Fedora

On Mon, Oct 01, 2012 at 10:35:57PM +0100, M A Young wrote:
> There have been a few xen kernel bug reported recently in Fedora.
> In https://bugzilla.redhat.com/show_bug.cgi?id=861977 someone is
> getting the error  WARNING: at arch/x86/xen/setup.c:88
> xen_memory_setup with the kernel 3.5.4-2.fc17.x86_64 (which is
> roughly 3.5.4 plus patches from the 3.5.5 patch queue including the
> backports of
> xen/boot: Disable NUMA for PV guests 8d54db795dfb1049d45dc34f0dddbc5347ec5642
> xen/boot: Disable BIOS SMP MP table search 
> bd49940a35ec7d488ae63bd625639893b3385b97
> xen/m2p: do not reuse kmap_op->dev_bus_addr 
> 2fc136eecd0c647a6b13fcd00d0c41a1a28f35a5
> plus xen-pciback-restore-pci-config-space-after-FLR.patch

Oh, so that WARN was suppose to catch rather weird cases - and it did!
FYI, It was added by
xen/setup: Fix one-off error when adding for-balloon PFNs to the P2M.

Let me help figure out what the issue is.
> In https://bugzilla.redhat.com/show_bug.cgi?id=858893 there is a
> NULL pointer dereference at xennet_poll+0x94e/0xf10 in
> 3.6.0-0.rc2.git2.1.fc18.x86_64

That should be fixed with 3.6.0-rc5.
> There is also https://bugzilla.redhat.com/show_bug.cgi?id=859466
> where xen 4.2 does not boot on MacBook with a 3.5 kernel unless
> xsave=off which seems to relate to
> https://lists.fedoraproject.org/pipermail/xen/2012-August/005879.html

There was another discussion and the Fedora kernel engineers mentioned
they removed the patch that broke this. Here is the thread:


>       Michael Young

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