Re: [Xen-devel] Xen-devel Digest, Vol 130, Issue 521

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

On 2015-12-21 23:58, xen-devel-request@xxxxxxxxxxxxx wrote:
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> Today's Topics:
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>    1. hvc console not working on 4.4.0 guest (M A Young)
>
> I am testing Fedora rawhide in a xen pv guest and I get the error
> [    9.809550] genirq: Flags mismatch irq 8. 00000000 (hvc_console) vs.
> 00000000 (rtc0)
> [    9.809714] hvc_open: request_irq failed with rc -16.
> during the boot and the hvc console doesn't respond when the boot
> finishes. I have noticed this I think since the update through various
> linux 4.4.0 kernels up to the current 4.4.0-0.rc5.git3.1.fc24.x86_64 
> one.
> I do get an hvc console if I use the Fedora 23 kernel 
> 4.2.6-300.fc23.x86_64
> from before the update.
> Is this a known problem? I have attached the boot log up to the above
> error.
>
>         Michael Young
Hi Michael,

Yes it's a known problem, the patch for it was just accepted into the 
tip tree:
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=d8c98a1d1488747625ad6044d423406e17e99b7a

So it will land in 4.4-final, the 2 patches causing this regression were 
unfortunately also already backported
to the stable trees (despite objection), but hopefully the fix wil also 
hit stable in the next round.
--
Sander

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