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Date:   Wed, 7 Sep 2022 22:58:41 +0800
From:   Ming Lei <ming.lei@redhat.com>
To:     Chaitanya Kulkarni <chaitanyak@nvidia.com>
Cc:     "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
        "linux-raid@vger.kernel.org" <linux-raid@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Dusty Mabe <dusty@dustymabe.com>,
        Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        Xiao Ni <xni@redhat.com>, Song Liu <song@kernel.org>,
        Nigel Croxon <ncroxon@redhat.com>
Subject: Re: regression caused by block: freeze the queue earlier in
 del_gendisk
Message-ID: <YxixoYNB0VTc8Zd+@T590>
References: <017845ae-fbae-70f6-5f9e-29aff2742b8c@dustymabe.com>
 <YxBZ4BBjxvAkvI2A@T590>
 <20220907073324.GB23826@lst.de>
 <YxhYjaA3CrMz5njZ@T590>
 <44ab9f7d-8f00-5f80-210e-f65f02f6fd82@nvidia.com>
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Precedence: bulk

On Wed, Sep 07, 2022 at 02:40:57PM +0000, Chaitanya Kulkarni wrote:
> Hi all,
> 
> On 9/7/22 01:38, Ming Lei wrote:
> > 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
> > 
> 
> It would be really helpful if mdraid experts can write blktests so it
> will get tested in the nightly builds along with other tests with
> different distros.

Can't agree more, and Cc linux-raid and our raid guys.

And looks this one is more related with imsm.


Thanks,
Ming