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

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Date:	Fri, 22 May 2009 13:59:13 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Max Kellermann <mk@...all.com>
CC:	Glauber Costa <glommer@...hat.com>, 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>,
	Cyrill Gorcunov <gorcunov@...il.com>
Subject: Re: [PATCH] NFS regression in 2.6.26?, "task blocked for more than
 120 seconds"

Max Kellermann wrote:
> 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.
> 

I was just pointed to this thread in the archives, and I'm really
wondering what was going on here.  In particular, if this machine still
is around, I would appreciate a dump of /proc/cpuinfo as well as
dmidecode from this machine.

Thanks,

	-hpa
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