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Bug#252289: general: system clock goes chaoticly causing system breakdown

On Thu, 17 Jun 2004, Henrique de Moraes Holschuh wrote:
On Thu, 17 Jun 2004, Antos Andras wrote:
I observed that in the timer line of /proc/interrupts, while normally the
number increases by cc. 99.8-101.6 in a sec, when the timer "is stuck" it
_does not increase at all_ shown by a command

# while true; do grep timer /proc/interrupts; done

But if I press a key while the command above is running, then the number
increases by 2!

Some more observation: while in /proc/interrupts the counter in line
  0:     687579    IO-APIC-edge  timer
is stuck, the counter in line
LOC:     778507
is increasing at cc. 100HZ. The counter in line
  1:      36989    IO-APIC-edge  keyboard
is also increases by 2 as I press a key.

Whatever is triggering it might be something you run, or the fact that you used the keyboard, or anything like that. But it is definatley not something fiddling with the clock "normally". It could be a software iteration (probably something dealing with interrupts and the APIC), or a hardware issue.

I agree. My feeling is that it is sometimes triggered simply by keyboard or mouse use.

It only happens when you log using the console, right?  ssh logins never
cause the problem?

Yes, console or xdm. I haven't experienced the problem during ssh logins.

remove the keyboard (and if you use it, the mouse), and attach an USB keyboard (and USB mouse). If your keyboard is an USB one, switch keyboards and USB port *group*. Does that fix the problem?

I have been using a PS2 mouse and (I think) a PS2 keyboard (it's an IBM NetVista machine with its original mouse & keyboard). I'll try to get USB ones.

Disable ACPI, APM and IOAPIC.  Does that fix the problem?  If so, please
narrow down what subsystem is causing the problem.

On Thu, 17 Jun 2004, Andrew Suffield wrote:
That's probably a misconfigured APIC. Kernel/hardware bug. Don't use
the APIC, or find a fix for your motherboard.

Do you mean to recompile a kernel with some options disabled ? If yes, which of the following options should I disable:



(Btw, CONFIG_ACPI has been already disabled in my custom kernel which also showed the problem.)

Thanks for your help.

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