Re: [PATCH] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"
From: Glauber Costa
Date: Mon Oct 20 2008 - 09:16:20 EST
On Mon, Oct 20, 2008 at 4:51 AM, Max Kellermann <mk@xxxxxxxxxx> wrote:
> On 2008/10/17 16:33, Glauber Costa <glommer@xxxxxxxxxx> 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 126.96.36.199 + 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.
There's a patch in flight from cyrill that probably fixes your problem:
The checks are obviously there for a reason, and we can't just wipe
them out unconditionally ;-) So can you check please that you are also
covered by the case provided?
> On 2008/10/20 08:27, Ian Campbell <ijc@xxxxxxxxxxxxxx> 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
> 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.
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