linux-kernel - Re: 4.2-rc5 rcu stalls.

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Message-ID: <20150805144635.GA5049@codemonkey.org.uk>
Date:	Wed, 5 Aug 2015 10:46:35 -0400
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>, paulmck@...ux.vnet.ibm.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Josh Triplett <josh@...htriplett.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: 4.2-rc5 rcu stalls.

On Wed, Aug 05, 2015 at 04:38:14PM +0200, Frederic Weisbecker wrote:
 
 > >  > Also did you just launch trinity? no specific options?
 > >  
 > > basically
 > > 
 > > while [ 1 ];
 > > do
 > >   trinity -N 1000000 -q -l off -C256 -a64 -x fsync -x fdatasync -x syncfs -x sync -P INET --enable-fds=sockets
 > >   sudo ipcrm -a
 > > done
 > > 
 > > (The ipcrm thing is needed for long runs or eventually you oom, because trinity lacks the cleanup smarts)
 > 
 > Ok, can I run that safely on my testbox without it eating some of my files or should
 > I use some special purposed guest?

I wouldn't run it on anything with data I cared about (even nfs mounts)
While there are some safeguards, there might be some cases I've not thought about.

	Dave


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