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    SubjectRe: [PATCH] NFS regression in 2.6.26?, "task blocked for more than 120 seconds"
    On Mon, Oct 20, 2008 at 4:51 AM, Max Kellermann <mk@cm4all.com> wrote:
    > On 2008/10/17 16:33, Glauber Costa <glommer@redhat.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.
    >

    There's a patch in flight from cyrill that probably fixes your problem:
    http://lkml.org/lkml/2008/9/15/93

    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@hellion.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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    --
    Glauber Costa.
    "Free as in Freedom"
    http://glommer.net

    "The less confident you are, the more serious you have to act."


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