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	diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2
	--- a/lib/libc/sys/kqueue.2
	+++ b/lib/libc/sys/kqueue.2
	@@ -390,8 +390,8 @@
	will contain the maximum value that can be added to the counter
	without blocking.
	.Pp
	-For BPF devices, the filter always indicates that it is possible to
	-write and
	+For BPF devices, when the descriptor is attached to an interface the filter
	+always indicates that it is possible to write and
	.Va data
	will contain the MTU size of the underlying interface.
	.It Dv EVFILT_EMPTY
	diff --git a/sys/net/bpf.c b/sys/net/bpf.c
	--- a/sys/net/bpf.c
	+++ b/sys/net/bpf.c
	@@ -763,6 +763,10 @@
	CK_LIST_INSERT_HEAD(&bp->bif_dlist, d, bd_next);

	reset_d(d);
	+
	+ /* Trigger EVFILT_WRITE events. */
	+ bpf_wakeup(d);
	+
	BPFD_UNLOCK(d);
	bpf_bpfd_cnt++;

	@@ -2229,11 +2233,16 @@
	filt_bpfwrite(struct knote *kn, long hint)
	{
	struct bpf_d d = (struct bpf_d )kn->kn_hook;
	- BPFD_LOCK_ASSERT(d);

	- kn->kn_data = d->bd_bif->bif_ifp->if_mtu;
	+ BPFD_LOCK_ASSERT(d);

	- return (1);
	+ if (d->bd_bif == NULL) {
	+ kn->kn_data = 0;
	+ return (0);
	+ } else {
	+ kn->kn_data = d->bd_bif->bif_ifp->if_mtu;
	+ return (1);
	+ }
	}

	#define BPF_TSTAMP_NONE 0