linux-kernel - Re: Lockdep splat in -next

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Message-ID: <20210628221550.GJ4397@paulmck-ThinkPad-P17-Gen-1>
Date:   Mon, 28 Jun 2021 15:15:50 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Jason Gunthorpe <jgg@...dia.com>
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 01:08:41PM -0300, Jason Gunthorpe wrote:
> 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???

Apparently I am as well, apologies for the noise.  I incorrectly assumed
that v5.13-rc1 was clean, but this deadlock really is present in v5.13-rc.

And here I thought I was handling the heat relatively well...

							Thanx, Paul