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

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Message-ID: <20220705004809.6guf43xwjpq33smo@shindev>
Date:   Tue, 5 Jul 2022 00:48:10 +0000
From:   Shinichiro Kawasaki <shinichiro.kawasaki@....com>
To:     "hch@...radead.org" <hch@...radead.org>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "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 Jun 27, 2022 / 23:18, Christoph Hellwig wrote:
> On Tue, Jun 28, 2022 at 08:12:51AM +0200, Greg Kroah-Hartman wrote:
> > Ah, so it's a fake PCI device, or is it a real one?
> 
> Whatever the blktests configuration points to.  But even if it is
> "fake" that fake would come from the hypervisor.

FYI, the WARN was observed with real PCI NVMe device also. I observed the WARN
with v5.19-rc1 and still observe with v5.19-rc5. I'm not sure which version
introduced the WARN.

I once reported this failure, and shared with linux-pci list.

https://lore.kernel.org/linux-block/20220614010907.bvbrgbz7nnvpnw5w@shindev/

-- 
Shin'ichiro Kawasaki