Florian Beier wrote:
Am Donnerstag, 18. Mai 2006 08:17 schrieben Sie:
good old printk may help you to track a trace of where it's going.
-Amit
Watchdog doesn't work - indeed :(.
Given this is an x86 box, I suspect a configuration problem around the NMI
rather than a double fault (which, I think, will force a reboot rather than a
hang). It is also possible that the system is not as frozen as you are
reporting...
Try this:
Before the failure, break in with a ^C and do a "bt". This should back trace
to prior to the interrupt. If, instead, it back traces to the scheduler you
are running a system with interrupt task handlers. There should be a way to
configure KGDB to do direct interrupts for the ^C. I know I did this for one
of the "rt" system configurations. Given this works (i.e. it bts into an
interrupt) see below...
Make sure that you have the NMI watchdog properly configured. The easy way
to do this is with an SMP box where you can use the APIC set up with the PIT
interrupts. If it is not an SMP box, if you have a local APIC you can still
use the APIC thing. Otherwise, you need a box with performance registers
that can trigger NMI interrupts. Please see ../arch/ie86/kernel/nmi.c for
details on this. First test along this line is to grep .config for NMI to
see what actually is configured.
How can I make shure, that the printks are all written from the buffer to
screen before the system freezes? Or is it possible to write any output
directly to the serial interface?
I think that an untagged printk forces output prior to returning. Others may
know more on this, but I am sure that, if the untagged printk does not wait,
there is a tag (or a method) that will wait.
George
--
Florian
--
George Anzinger [EMAIL PROTECTED]
HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/
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