Re: [Xen-devel] Linux 5.5 fails to boot in VM

["Ilpo Järvinen" <ilpo.jarvinen@xxxxxxxxxxxxxx>]

On Mon, 27 Jan 2020, Marek Marczykowski-Górecki wrote:

> On Mon, Jan 27, 2020 at 03:45:11PM +0100, Jürgen Groß wrote:
> > On 27.01.20 14:16, Ilpo Järvinen wrote:
> > > Hi,
> > > 
> > > I've noted that 5.5-rcs and now 5.5-based kernel fails to boot in VM.
> > > 5.4 based kernels worked fine and there seems to have been some changes in
> > > drivers/xen post-5.4 so perhaps they broke something?
> > 
> > I can't reproduce your problem. Just booted a VM with kernel 5.5 as
> > PV- and as HVM-guest without any problems.
> 
> It looks like an issue with gntdev driver, so reproducing it require any
> userspace that actually makes use of it.

I don't know enough about gntdev to understand what would use it.

> Any idea what recent change could cause that?

This is just my debian-10 based AppVM booting up. There's nothing special 
in it I can think of besides the fact I've compiled the kernels myself 
(and have some TCP related changes in the kernel, the same which work very 
fine on 5.4; but the crash occurs so early into the boot I don't think TCP 
even comes into the equation yet).

I can of course compile a kernel without any of my mods if necessary 
and even try to bisect the problem if need be but any hint or idea which 
way I should look would certainly help in that effort.


-- 
 i.

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