linux-kernel - Re: [PATCH] sched: Avoid that __wait_on_bit

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Message-ID: <abb46a22-c394-b383-bad1-33502367c1e6@sandisk.com>
Date:	Tue, 16 Aug 2016 09:54:43 -0700
From:	Bart Van Assche <bart.vanassche@...disk.com>
To:	Oleg Nesterov <oleg@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Johannes Weiner" <hannes@...xchg.org>, Neil Brown <neilb@...e.de>,
	Michael Shaver <jmshaver@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: Avoid that __wait_on_bit_lock() hangs

On 08/16/2016 06:06 AM, Oleg Nesterov wrote:
> If only I could reproduce. Or at least understand what are you doing to
> hit this bug ;)

Hello Oleg,

What I'm doing to hit this bug is to run the test script that is 
available at https://github.com/bvanassche/srp-test on a setup that is 
equipped with at least one InfiniBand adapter. I see the following 
possibilities for you to reproduce this:
* Ask a colleague for access to an IB setup.
* Add RoCE support to the srp-test script and run that script against a
   v4.8 kernel + ib_srp-backport + SCST ib_srpt drivers. These last two
   (out-of-tree) drivers namely support SRP over RoCE. The upstream
   drivers not yet. The SRP-over-RoCE functionality will be sent
   upstream as soon as standardization of this protocol by the T10
   committee has finished (this work has already been started and will
   probably be finished later this year).

Please let me know if you need more information.

Bart.