SW_WDOG problem
Scott Long
scottl at freebsd.org
Tue Jul 13 13:01:33 PDT 2004
Gerrit Nagelhout wrote:
> Hi,
>
> Were are trying out the new software watchdog on current (from a couple of
> weeks ago) and are running into a panic within a panic. What happens is
> when the software watchdog tries to panic the system (with interrupts
> disabled),
> it manages to write out the core file, but then panics again in
> pmap_invalidate_range
> because interrupts are enabled.
> Any ideas on how to work around this?
> Thanks,
>
> Gerrit
>
>
This is from a well known class of problems. There has been talk about
disabling the shutdown fsync in the panic case. It's both unsafe
(why try to continue to do I/O when you've paniced because the
system has gone into an unreliable state) and hard to do correctly
without running into these kinds of problems.
Scott
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