Apply by doing:
       cd /usr/src
       patch -p0 < 010_fifofs.patch

And then rebuild your kernel.

Index: sys/miscfs/fifofs/fifo_vnops.c
===================================================================
RCS file: /cvs/src/sys/miscfs/fifofs/fifo_vnops.c,v
retrieving revision 1.19
retrieving revision 1.19.2.1
diff -u -p -r1.19 -r1.19.2.1
--- sys/miscfs/fifofs/fifo_vnops.c      2 Mar 2004 04:42:52 -0000       1.19
+++ sys/miscfs/fifofs/fifo_vnops.c      26 May 2004 20:27:43 -0000      1.19.2.1
@@ -191,18 +191,20 @@ fifo_open(v)
               rso->so_state |= SS_CANTRCVMORE;
       }
       if (ap->a_mode & FREAD) {
-               if (fip->fi_readers++ == 0) {
+               fip->fi_readers++;
+               if (fip->fi_readers == 1) {
                       fip->fi_writesock->so_state &= ~SS_CANTSENDMORE;
                       if (fip->fi_writers > 0)
                               wakeup(&fip->fi_writers);
               }
       }
       if (ap->a_mode & FWRITE) {
+               fip->fi_writers++;
               if ((ap->a_mode & O_NONBLOCK) && fip->fi_readers == 0) {
                       error = ENXIO;
                       goto bad;
               }
-               if (fip->fi_writers++ == 0) {
+               if (fip->fi_writers == 1) {
                       fip->fi_readsock->so_state &= ~SS_CANTRCVMORE;
                       if (fip->fi_readers > 0)
                               wakeup(&fip->fi_readers);

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