linux-kernel - Re: [bug report from blktests nvme/032] WARNING: possible circular locking dependency detected

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Message-ID: <YrqbNfF9uYMSwZ4V@infradead.org>
Date:   Mon, 27 Jun 2022 23:09:57 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "yangx.jy@...itsu.com" <yangx.jy@...itsu.com>,
        Tejun Heo <tj@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Subject: Re: [bug report from blktests nvme/032] WARNING: possible circular
 locking dependency detected

On Tue, Jun 28, 2022 at 08:07:52AM +0200, Greg Kroah-Hartman wrote:
> On Tue, Jun 28, 2022 at 04:03:55AM +0000, yangx.jy@...itsu.com wrote:
> > Hi everyone,
> > 
> > Running blktests nvme/032 on kernel v5.19-rc2+ which enables 
> > CONFIG_LOCKDEP and CONFIG_PROVE_LOCKING triggered the below WARNING.
> 
> What was happening when this trace was created?  It looks like you were
> manually removing a PCI device from the system through sysfs?  Why would
> blktests do that?

To test how the block layer copes with the fact that the underlying
device goes away.