Index: sys/kern/vfs_bio.c
===================================================================
--- sys/kern/vfs_bio.c
+++ sys/kern/vfs_bio.c
@@ -4423,7 +4423,10 @@
 	CTR3(KTR_BUF, "bufdone(%p) vp %p flags %X", bp, bp->b_vp, bp->b_flags);
 	dropobj = NULL;
 
-	KASSERT(!(bp->b_flags & B_DONE), ("biodone: bp %p already done", bp));
+	KASSERT((bp->b_flags & B_DONE) == 0,
+	    ("biodone: bp %p already done", bp));
+	KASSERT((bp->b_flags & B_BARRIER) == 0,
+	    ("biodone: bp %p leaks B_BARRIER", bp));
 
 	runningbufwakeup(bp);
 	if (bp->b_iocmd == BIO_WRITE)
Index: sys/ufs/ffs/ffs_vfsops.c
===================================================================
--- sys/ufs/ffs/ffs_vfsops.c
+++ sys/ufs/ffs/ffs_vfsops.c
@@ -2582,6 +2582,7 @@
 					    error != EOPNOTSUPP) {
 						bp->b_error = error;
 						bp->b_ioflags |= BIO_ERROR;
+						bp->b_flags &= ~B_BARRIER;
 						bufdone(bp);
 						return;
 					}
@@ -2594,6 +2595,7 @@
 				if (error != 0 && error != EOPNOTSUPP) {
 					bp->b_error = error;
 					bp->b_ioflags |= BIO_ERROR;
+					bp->b_flags &= ~B_BARRIER;
 					bufdone(bp);
 					return;
 				}