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Re: Kernel panic on 'floppy' module load, Xen HVM, since 4.19.143


  • To: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Jürgen Groß <jgross@xxxxxxxx>
  • From: Denis Efremov <efremov@xxxxxxxxx>
  • Date: Tue, 29 Sep 2020 15:27:43 +0300
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  • Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Roman Shaposhnik <roman@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
  • Delivery-date: Tue, 29 Sep 2020 12:27:50 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

Hi,

On 9/28/20 12:36 PM, Marek Marczykowski-Górecki wrote:
> On Mon, Sep 28, 2020 at 07:02:19AM +0200, Jürgen Groß wrote:
>> On 27.09.20 13:14, Marek Marczykowski-Górecki wrote:
>>> Hi all,
>>>
>>> I get kernel panic on 'floppy' module load. If I blacklist the module,
>>> then everything works.
>>> The issue happens in Xen HVM, other virtualization modes (PV, PVH) works
>>> fine. PV dom0 works too. I haven't tried bare metal, but I assume it
>>> works fine too.
>>
>> Could you please try bare metal?
> 
> I don't have any hw with floppy controller at hand...
> Booting on what I have, it works, loading floppy just says -ENODEV.

I saw that the issue was bisected [1] to commit
c330fb1ddc0a ("XEN uses irqdesc::irq_data_common::handler_data to store a
per interrupt XEN data pointer which contains XEN specific information.")

I have hardware, but I've never worked with Xen. It will take me some time
to set it up and reproduce the problem. I think I will do it in a week.

[1] https://github.com/QubesOS/qubes-issues/issues/6074#issuecomment-699636351


Thanks,
Denis



 


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