linux-kernel - Re: BUG: 'list_empty(&vgdev->free

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Date:   Tue, 15 Nov 2016 10:05:03 +0100
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org
Subject: Re: BUG: 'list_empty(&vgdev->free_vbufs)' is true!

On Di, 2016-11-15 at 09:55 +0100, Jiri Slaby wrote:
> On 11/15/2016, 09:46 AM, Gerd Hoffmann wrote:
> > On Fr, 2016-11-11 at 17:28 +0100, Jiri Slaby wrote:
> >> On 11/09/2016, 09:01 AM, Gerd Hoffmann wrote:
> >>> On Di, 2016-11-08 at 22:37 +0200, Michael S. Tsirkin wrote:
> >>>> On Mon, Nov 07, 2016 at 09:43:24AM +0100, Jiri Slaby wrote:
> >>>>> Hi,
> >>>>>
> >>>>> I can relatively easily reproduce this bug:
> >>>
> >>> How?
> >>
> >> Run dmesg -w in the qemu window (virtio_gpu) to see a lot of output.
> > 
> > fbcon?  Or xorg/wayland with terminal app?
> 
> Ah, just console, so fbcon. No X server running.

Hmm, /me looks puzzled.  fbcon doesn't do cursor updates, so the cursor
queue can hardly be full and there should be enough buffers even without
allocating 16 extra bufs.  I'll go try reproduce and analyze that one.
The +16 patch submitted nevertheless as temporary stopgap.

cheers,
  Gerd