linux-kernel - Re: [PATCH] llist: Fix missing lockless

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Message-ID: <20150210093042.GA21696@omega>
Date:	Tue, 10 Feb 2015 22:30:42 +1300
From:	Michael Cree <mcree@...on.net.nz>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-alpha@...r.kernel.org,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Matt Turner <mattst88@...il.com>,
	Huang Ying <ying.huang@...el.com>,
	linux-kernel@...r.kernel.org,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Pranith Kumar <bobby.prani@...il.com>, stable@...r.kernel.org
Subject: Re: [PATCH] llist: Fix missing lockless_dereference()

On Sun, Feb 08, 2015 at 04:25:46AM +0000, Mathieu Desnoyers wrote:
> > From: "Michael Cree" <mcree@...on.net.nz>
> > The Alpha kernel is behaving pretty well provided one builds a machine
> > specific kernel and UP.  When running an SMP kernel some packages
> > (most notably the java runtime, but there are a few others) occasionally
> > lock up in a pthread call --- could be a problem in libc rather then the
> > kernel.
> 
> Are those lockups always occasional, or you have ways to reproduce them
> frequently with stress-tests ?

They are occasional but a build of openjdk-7 bootstrapping from itself
is very likely to end up with a locked up javac process.  I've just set
such a build going with the openjdk-7 build-dependencies and some extra
debug packages installed in the build chroot to see if I can get a
useful backtrace.  Will be tomorrow morning when I look as I am now
heading off for the night.

Cheers
Michael.
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