linux-kernel - Re: [ANNOUNCE] 3.14-rt1

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Message-ID: <1397918766.5436.16.camel@marge.simpson.net>
Date:	Sat, 19 Apr 2014 16:46:06 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:	linux-rt-users <linux-rt-users@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org,
	John Kacur <jkacur@...hat.com>
Subject: Re: [ANNOUNCE] 3.14-rt1

Hi Sebastian,

On Fri, 2014-04-11 at 20:57 +0200, Sebastian Andrzej Siewior wrote: 
> Dear RT folks!
> 
> I'm pleased to announce the v3.14-rt1 patch set.

This hunk in hotplug-light-get-online-cpus.patch looks like a bug.

@@ -333,7 +449,7 @@ static int __ref _cpu_down(unsigned int
                /* CPU didn't die: tell everyone.  Can't complain. */
                smpboot_unpark_threads(cpu);
                cpu_notify_nofail(CPU_DOWN_FAILED | mod, hcpu);
-               goto out_release;
+               goto out_cancel;
        }
        BUG_ON(cpu_online(cpu));


> x86-64 crashed after I started hackbench. I figured out that the crash
> does not happen with lazy-preempt disabled. Therefore the last but one
> patch in the queue disables lazy preempt on x86-64. With this change the
> test box survived ~2h without a crash. I look at this later but it looks
> good now.

Ah, I had trouble there a while back too.  I'll try to scrape up cycles
for a round 2, see who begs for mercy this time, it or me again.

-Mike

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