linux-kernel - Re: Random guest crashes since 5c34d002dcc7 ("virtio_pci: use shared interrupts for virtqueues")

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Date:   Mon, 3 Apr 2017 21:11:16 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Mike Galbraith <efault@....de>
Cc:     Christoph Hellwig <hch@....de>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        virtio-dev@...ts.oasis-open.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        rjones@...hat.com
Subject: Re: Random guest crashes since 5c34d002dcc7 ("virtio_pci: use shared
 interrupts for virtqueues")

On Mon, Apr 03, 2017 at 07:56:32PM +0200, Mike Galbraith wrote:
> On Mon, 2017-04-03 at 16:18 +0200, Christoph Hellwig wrote:
> > Mike,
> > 
> > can you try the patch below?
> 
> No more spinning kworker woes, but I still have a warning on hibernate,
> threadirqs invariant.  I'm also seeing intermittent post hibernate hang
> funnies in virgin source +- this patch, and without threadirqs.
> 
> [  110.223953] WARNING: CPU: 5 PID: 452 at drivers/pci/msi.c:1261 pci_irq_vector+0xb1/0xe0
> 
> 	-Mike

I just sent a patch fixing that.
However I think we want to print a message when MSI fails to work so we
know guest is falling back on legacy interrupts.

-- 
MST