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Re: ddb(4) and LOCKDEBUG incompatibility
On Sat, May 31, 2008 at 10:20:47AM -0700, Matt Thomas wrote:
> On May 30, 2008, at 3:42 AM, Andrew Doran wrote:
> >On Thu, May 29, 2008 at 11:23:42PM -0500, David Young wrote:
> >>I hit the magic keys on a NetBSD router to break into ddb, and I got
> >>the LOCKDEBUG panic and page fault loop (see below). I'm
> >>wondering if
> >>there is a prayer of using ddb and LOCKDEBUG together, since it
> >>can be
> >>awfully useful.
> >>It seems that we can sometimes punt on synchronization when ddb is
> >>since that implies that the other CPUs on the system are suspended.
> >There's no way we can resolve page faults from interrupt context,
> >so I have
> >changed x86 to not call uvm_fault() if an interrupt is active. I
> >think that
> >should fix it.
> That than changing all the ports (powerpc has done that check since
> now that we have cpu_intr_p(), make uvm_fault check it.
Good idea, I'll look into doing that in the next few days.
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