linux-kernel - Re: [PATCH 00/10] Misc block layer patches for bcachefs

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Date:   Sun, 20 May 2018 23:10:54 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "kent.overstreet@...il.com" <kent.overstreet@...il.com>
CC:     "mingo@...nel.org" <mingo@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>
Subject: Re: [PATCH 00/10] Misc block layer patches for bcachefs

On Sun, 2018-05-20 at 19:00 -0400, Kent Overstreet wrote:
> On Sun, May 20, 2018 at 10:35:29PM +0000, Bart Van Assche wrote:
> > On Sun, 2018-05-20 at 18:31 -0400, Kent Overstreet wrote:
> > > On Sun, May 20, 2018 at 10:19:13PM +0000, Bart Van Assche wrote:
> > > > On Sun, 2018-05-20 at 18:17 -0400, Kent Overstreet wrote:
> > > > > On Fri, May 18, 2018 at 03:12:27PM +0000, Bart Van Assche wrote:
> > > > > > On Fri, 2018-05-18 at 05:06 -0400, Kent Overstreet wrote:
> > > > > > > On Thu, May 17, 2018 at 08:54:57PM +0000, Bart Van Assche wrote:
> > > > > > > > With Jens' latest for-next branch I hit the kernel warning shown below. Can
> > > > > > > > you have a look?
> > > > > > > 
> > > > > > > Any hints on how to reproduce it?
> > > > > > 
> > > > > > Sure. This is how I triggered it:
> > > > > > * Clone https://github.com/bvanassche/srp-test.
> > > > > > * Follow the instructions in README.md.
> > > > > > * Run srp-test/run_tests -c -r 10
> > > > > 
> > > > > Can you bisect it? I don't have infiniband hardware handy...
> > > > 
> > > > Hello Kent,
> > > > 
> > > > Have you noticed that the test I described uses the rdma_rxe driver and hence that
> > > > no InfiniBand hardware is needed to run that test?
> > > 
> > > No, I'm not terribly familiar with infiniband stuff....
> > > 
> > > Do you have some sort of self contained test/qemu recipe? I would really rather
> > > not have to figure out how to configure multipath, and infiniband, and I'm not
> > > even sure what else is needed based on that readme...
> > 
> > Please have another look at the srp-test README. The instructions in that document
> > are easy to follow. No multipath nor any InfiniBand knowledge is required. The test
> > even can be run in a virtual machine in case you would be worried about potential
> > impact of the test on the rest of the system.
> 
> Your readme refers to kernel config options that don't even exist in the current
> kernel

That's probably a misunderstanding of your side. From a quick look it seems like all
config symbols mentioned in the srp-test README.md exist in kernel v4.17-rc6. The
following command does not report any non-existing Kconfig symbols:

$ cd linux-kernel
$ sed -n 's/^\* CONFIG_//p' ~/software/infiniband/srp-test/README.md |
  while read f; do { git grep -lw "$f" | grep -q Kconfig; } || echo $f; done

Bart.