Re: [2.6.15-rc7-rt1] check_monotonic_clock: monotonic inconsistency detected!

[Mike Galbraith]

At 10:49 AM 12/31/2005 -0500, Steven Rostedt wrote:
> On Sat, 2005-12-31 at 16:00 +0100, Mike Galbraith wrote:
> > Greetings,
> >
> > After running just fine for most of the day, my PIII/500 coughed up
> > attached fur-ball as I tried to start my ancient (au) sound
> > server.  Subsequent repeated starting and stopping of same did not 
> induce a
> > repeat (but then all zillion sound modules were loaded).  If any other 
> info
> > is needed, just holler.
>
> [inlining the attachment]
>
> check_monotonic_clock: monotonic inconsistency detected!
>         from     191c7872fef6 (27610070580982) to     191c7872dd13 
> (27610070572307).
> softirq-hrtimer/8[CPU#0]: BUG in check_monotonic_clock at 
> kernel/time/timeofday.c:160
>  [<c0104063>] dump_stack+0x23/0x30 (20)
>  [<c011db1a>] __WARN_ON+0x6a/0xa0 (44)
>  [<c013c8d2>] check_monotonic_clock+0xe2/0x100 (52)
>  [<c013cd85>] get_monotonic_clock+0xe5/0x120 (80)
>  [<c0135b16>] hrtimer_forward+0x36/0xf0 (80)
>  [<c0120cbb>] it_real_fn+0x6b/0x80 (28)
>  [<c0136345>] run_hrtimer_softirq+0x65/0x150 (52)
>  [<c0122826>] ksoftirqd+0x116/0x1c0 (60)
>  [<c01325b9>] kthread+0xa9/0xf0 (52)
>  [<c0101245>] kernel_thread_helper+0x5/0x10 (671293468)
> ------------------------------
> | showing all locks held by: |  (softirq-hrtimer/8 [d7fcabb0,  98]):
> ------------------------------
>
> [end inline]
>
> This looks like it probably has nothing to do with your module.  The
> monotonic clock went backwards.  Also, it will only print once per boot,
> even if the event happens again.
>
> Is your system SMP?

No.

>  Could you also send your config.

Attached.  (this is winbloze eudora, no inlining possible)

>   And John will
> probably want to see your dmesg output.

I'll send that off-line upon request.  FWIW, it's not the original boot 
dmesg output however, but one a freshly booted system...

As luck would have it, just as I was collecting the data, there was a major 
explosion.  Box was slogging through glibc make check, and when it hit the 
mutex tests in nptl, KaBOOM.  Ding-dong-dead box... [reboot] oh my, seems 
repeatable.  Guess I'll see if I can find my serial console cable instead 
of typing make install as originally planned :)

        -Mike

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