Messages in this thread | | | From | Andrew Lutomirski <> | Date | Tue, 9 Nov 2010 12:44:48 -0500 | Subject | Re: HPET (?) related hangs and breakage in 2.6.35,36 |
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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
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