conditional enter to DDB on busy buffers

Richard Nyberg rnyberg at
Fri Jul 16 06:41:49 PDT 2004

At Fri, 16 Jul 2004 08:41:08 +0000,
David Rhodus wrote:
> Richard Nyberg wrote:
> > Since I don't have a serial console I don't want my computer
> > to risk entering the debugger at reboot if it cannot sync its buffers.
> > The patch at the URL below checks the "debugger_on_panic" sysctl to
> > conditionalize use of the debugger.
> > 
> >
> > 
> > Happy hacking!
> >         -Richard
> > 
> Is this a problem you are currently seeing ? If so can you get a dump of 
>   the system so we can look at that situation and diagnose the problem.
Yes I see it on my SMP machine, I've already uploaded a dump to leaf.

> If you don't want to deal with any debugging you should remove 'options 
> DDB' from your kernel config file. This is a problem that pops up from 
> time to time on sudo random hardware. Normally there are several reports 
> that will fly by the list before anyone will break to a debugger to give 
> us a traceback.
It's not that I don't want to deal with debugging, it's just that I want
to be able to reboot a computer remotely. The way I accomplished that
may be wrong, but I still think there should be a safe way to it.


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