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    SubjectRe: HPET (?) related hangs and breakage in 2.6.35,36
    On Tue, Nov 9, 2010 at 10:38 AM, Borislav Petkov <bp@amd64.org> wrote:
    > On Tue, Nov 09, 2010 at 04:20:56PM +0100, Clemens Ladisch wrote:
    >> Andrew Lutomirski wrote:
    >> > After several minutes of uptime, my system freezes in a strange way.
    >> > All of userspace and some kernel services freeze hard (no mouse, no
    >> > typing, etc.)  Caps-lock works intermittently, as does (I think)
    >> > pinging.  The only debug output I've been able to get is this (typed
    >> > from a blurry photo because netconsole dies along with everything
    >> > else):
    >> >
    >> > [ 5478.244722] Clocksource tsc unstable (delta = 101399051316 ns)
    >> > [ 5478.367958] Switching to clocksource hpet
    >> > [ 5543.729698] BUG: soft lockup - CPU #1 stuck for 61s! [migration/1:6]
    >>
    >> Looks like this one:
    >> http://lkml.org/lkml/2010/10/26/126
    >
    > I don't think so: the one at the URL above is 37-rc1 specific (issue
    > came in during the merge window) while Andrew's problem can be
    > reproduced with 35 and 36, reportedly.
    >
    > Anyway, adding more people to Cc.

    I may have just reproduced after a couple of days of uptime it in
    2.6.36 with hpet=disable (in any case, the system hung and netconsole
    didn't work).

    I'm currently testing the hpet_min_tick stuff, backported to 2.6.36,
    with hpet on. Haven't had a problem yet, but I'll see what happens
    after a few hours. So far, it said:

    ACPI: HPET id: 0x8086a301 base: 0xfed00000 min tick: 128

    Is there any way that a tsc delta of >100 seconds occurring awhile
    after bootup on Nehalem with a single socket can real (as opposed to a
    bug making the kernel think that there was a delta when there really
    wasn't)?

    --Andy

    >
    > --
    > Regards/Gruss,
    > Boris.
    >
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    >
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