linux-kernel - Re: [PATCH] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"

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Date:	Mon, 20 Oct 2008 08:51:49 +0200
From:	Max Kellermann <mk@...all.com>
To:	Glauber Costa <glommer@...hat.com>
Cc:	linux-kernel@...r.kernel.org, ijc@...lion.org.uk,
	Grant Coady <grant_lkml@...o.com.au>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tom Tucker <tom@...ngridcomputing.com>
Subject: Re: [PATCH] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"

On 2008/10/17 16:33, Glauber Costa <glommer@...hat.com> wrote:
> That's probably something related to apic congestion.
> Does the problem go away if the only thing you change is this:
> 
> 
> > @@ -891,11 +897,6 @@ do_rest:
> >  		store_NMI_vector(&nmi_high, &nmi_low);
> >  
> >  		smpboot_setup_warm_reset_vector(start_ip);
> > -		/*
> > -		 * Be paranoid about clearing APIC errors.
> > -	 	*/
> > -		apic_write(APIC_ESR, 0);
> > -		apic_read(APIC_ESR);
> >  	}
> 
> 
> Please let me know.

Hello Glauber,

I have rebooted the server with 2.6.27.1 + this patchlet an hour ago.
No problems since.

Hardware: Compaq P4 Xeon server, Broadcom CMIC-WS / CIOB-X2 board.
Tell me if you need more detailed information.


On 2008/10/20 08:27, Ian Campbell <ijc@...lion.org.uk> wrote:
> The issue I see still occurs well before those changesets. I have
> seen it with v2.6.25 but v2.6.24 survived for 7 days without issue
> (my threshold for a good kernel is 7 days, hence bisecting is a bit
> slow...).

Hello Ian,

it seems we're hunting down different bugs after all.  Too bad, I
hoped I could have solved your problem, too.  Our machine has been
running well over the weekend with the patch I posted; with faulty
kernels, the problem would occur after a few minutes.

Max
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