cvs commit: src/sys/netinet if_ether.c

[Bruce M Simpson]

On Tue, Oct 26, 2004 at 03:31:59AM +0000, Bruce M Simpson wrote:
>   Log:
>   Check that rt_mask(rt) is non-NULL before dereferencing it, in the
>   RTM_ADD case, thus avoiding a panic.

PR:	kern/42030

It isn't immediately clear to me if this is a routing socket API issue
or a client issue.

The panic, at least, is worked around, but the root problem needs to be
fixed -- it is most likely a synchronization problem in zebra whereby it
is attempting to add a route to the kernel FIB which references an
interface which does not yet exist or has gone away.

At least one person who has reported this was running vtund, which plumbs
its own tun instances on demand; the other I think was running userland ppp.

I haven't seen anything similar with XORP yet.

BMS