TCP route caching panic

[Mike Karels]

> On Wed, Oct 19, 2016 at 07:26:44PM -0500, Mike Karels wrote:
> M> > On Wed, Oct 19, 2016 at 02:29:14PM -0700, Gleb Smirnoff wrote:
> M> > T>   Hi!
> M> > T> 
> M> > T>   I got this panic in a bhyve VM, which was just compiling stuff
> M> > T> and had two ssh sessions open. It has static network configuration,
> M> > T> one interfaces, one IP address, IPv4 only and it sees only hardware
> M> > T> address of the host. So it is minimal possible configuration. It
> M> > T> runs with INVARIANTS.
> M> 
> M> > Important note that kernel has FLOWTABLE option. And recently I refined
> M> > the original fix of FLOWTABLE+inpcb_route_cache. This might be related,
> M> > but I don't see how. The inp code explicitly nulls the ro_lle when
> M> > it frees it.
> M> 
> M> Hmm, I run a similar configuration, but may not run as many compiles.
> M> I'm running a recent head GENERIC system, so has INVARIANTS.  I've
> M> tested with FLOWTABLE in the past; I'll try it again now.  
> M> 
> M> But if I understand correctly, you have modifications?  Could we see
> M> them (assuming they are not in the tree, I haven't been watching closely)?

> No, I don't have modifications.

Sorry then, what did you mean by this:

    And recently I refined the original fix of FLOWTABLE+inpcb_route_cache.
    This might be related,

I've run one buildworld in s aimilar environment so far today, using NFS
to the host for the sources.  I'll try another.

	    Mike