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

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Date:	Mon, 8 Aug 2016 11:31:19 -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 08/08/2016 09:20 AM, Oleg Nesterov wrote:
> Do you use external modules during the testing?

Hello Oleg,

No external modules were loaded when I triggered the lockup I mentioned 
in the patch description. Although the SRP test software I referred to 
earlier can be run against the SCST SRP target driver, I'm using the 
in-tree LIO SRP target driver to reproduce this lockup. BTW, I think it 
is unlikely that the target driver framework is involved in the lockup 
since I have observed this lockup before when no SRP target driver was 
loaded on the test system. The same lockup also has already been 
observed with md-raid.

Thanks,

Bart.