stable/11 debugging kernel unable to produce crashdump

[Mark Johnston]

On Sat, Jan 14, 2017 at 06:40:02PM +0700, Eugene Grosbein wrote:
> 
> > I suspect that this is because we only stop the scheduler upon a panic
> > if SMP is configured. Can you retest with the patch below applied?
> > 
> > Index: sys/kern/kern_shutdown.c
> > ===================================================================
> > --- sys/kern/kern_shutdown.c	(revision 312082)
> > +++ sys/kern/kern_shutdown.c	(working copy)
> > @@ -713,6 +713,7 @@
> >  		CPU_CLR(PCPU_GET(cpuid), &other_cpus);
> >  		stop_cpus_hard(other_cpus);
> >  	}
> > +#endif
> >  
> >  	/*
> >  	 * Ensure that the scheduler is stopped while panicking, even if panic
> > @@ -719,7 +720,6 @@
> >  	 * has been entered from kdb.
> >  	 */
> >  	td->td_stopsched = 1;
> > -#endif
> >  
> >  	bootopt = RB_AUTOBOOT;
> >  	newpanic = 0;
> > 
> > 
> 
> Indeed, my router is uniprocessor system and your patch really solves the problem.
> Now kernel generates crashdump just fine in case of panic. Please commit the fix, thanks!

Thanks, committed as r312199.