charon% diff -u machdep.c.DIST machdep.c 
--- machdep.c.DIST      Fri Oct 14 10:11:44 1994
+++ machdep.c   Fri Nov 25 00:31:14 1994
@@ -783,7 +783,7 @@
        dumplo &= ~(ctod(1)-1);
 
        /* If it does not fit, truncate it by moving dumplo. */
-       if (dumplo < ctod(1)) {
+       if (dumplo < (long)(ctod(1))) {
                dumplo = ctod(1);
                dumpsize = dtoc(nblks - dumplo);
        }

Comparison always fails.  Surfaces as "savecore: read: invalid argument" on
machines with small primary swap.

Is there a way to dump in your second swap space (/dev/sd1b)?

Ken