Re: regression caused by block: freeze the queue earlier in del_gendisk

[Ming Lei]

On Wed, Sep 07, 2022 at 09:33:24AM +0200, Christoph Hellwig wrote:
> On Thu, Sep 01, 2022 at 03:06:08PM +0800, Ming Lei wrote:
> > It is a bit hard to associate the above commit with reported issue.
> 
> So the messages clearly are about something trying to open a device
> that went away at the block layer, but somehow does not get removed
> in time by udev (which seems to be a userspace bug in CoreOS).  But
> even with that we really should not hang.

The new device should be allocated from md_probe() via blk_request_module(),
and the underlying devices are virtio-blk from the fedora BZ2121791.

[1] https://bugzilla.redhat.com/show_bug.cgi?id=2121791

Thanks,
Ming