linux-kernel - Re: Lockdep splat in -next

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Message-ID: <20210628160841.GD4459@nvidia.com>
Date:   Mon, 28 Jun 2021 13:08:41 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     liuyixian@...wei.com, liweihang@...wei.com, sfr@...b.auug.org.au,
        linux-kernel@...r.kernel.org, linux-next@...r.kernel.org
Subject: Re: Lockdep splat in -next

On Mon, Jun 28, 2021 at 08:37:46AM -0700, Paul E. McKenney wrote:
> Hello, Yixian Liu,
> 
> The following -next commit results in a lockdep splat:
> 
> 591f762b2750 ("RDMA/hns: Remove the condition of light load for posting DWQE")
> 
> The repeat-by is as follows:
> 
> tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --trust-make --duration 1 --configs TASKS01
> 
> The resulting splat is as shown below.  This appears to have been either
> fixed or obscured by a later commit, but it does affect bisectability.
> Which I found out about the hard way.  ;-)

I'm confused, the hns driver is causing this, and you are able to test
with the hns hardware???

Jason