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Re: [Xen-devel] irq problem with 3.3-rc3 on guest

On Mon, 13 Feb 2012, Ian Campbell wrote:

On Sun, 2012-02-12 at 21:33 +0000, M A Young wrote:
I get the backtrace below if I try to boot a PV guest running F17 Alpha
TC2 in graphical mode. Is this a known problem?

It came up last year https://lkml.org/lkml/2011/1/6/19 which resulted in
the WARN_ON you saw instead of a kernel crash. I'm not sure if anyone
got to the bottom of the root cause though.

That occasion was a suspend/resume thing so perhaps not really related
but it seems fishily similar.

I've not looked at the code recently but it seems that back then I was
of the opinion that info->update_wanted == 0 must remain true until the
irq etc was all fully setup, that might be relevant now?

Yes, it does sound fishily similar. I didn't mention that it does work if I do a text boot and then switch to a graphical runlevel, so it could be somthing happening in the wrong order, such as the framebuffer starting before the irq is properly set up.

        Michael Young

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