spin lock sched lock held by 0xffffff007b712250 for > 5 seconds

[Willem Jan Withagen]

From: "Scott Long" <scottl at freebsd.org>
> Willem Jan Withagen wrote:
> > After todays kernelbuild the system seem to be a lot better...
> > It can take quite some buildworld abuse, but still:
> > 
> > spin lock sched lock held by 0xffffff007b712250 for > 5 seconds
> > panic: spin lock held too long
> > cpuid = 1;
> > KDB: enter: panic
> > 
> > 
> > 
> > But I'm not shure what I could/should do now, since the KDB introduction.
> > Normally I'd expect to see:
> > db>
> > 
> > But there no way to get any response.
> 
> Is your kernel built with both KDB and DDB?

from /usr/src/amd64conf/OPTERON.amd64

# Debugging for use in -current
options         KDB                     # Enable kernel debugger support.
options         KDB_TRACE
options         DDB                     # Support DDB.
options         GDB                     # Support remote GDB.

--WjW