diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
index 4e0832475c3..b5466fb2cd5 100644
--- a/sys/kern/vfs_bio.c
+++ b/sys/kern/vfs_bio.c
@@ -3985,9 +3985,11 @@ getblkx(struct vnode *vp, daddr_t blkno, daddr_t dblkno, int size, int slpflag,
 	    ("GB_KVAALLOC only makes sense with GB_UNMAPPED"));
 	if (vp->v_type != VCHR)
 		ASSERT_VOP_LOCKED(vp, "getblk");
-	if (size > maxbcachebuf)
-		panic("getblk: size(%d) > maxbcachebuf(%d)\n", size,
+	if (size > maxbcachebuf) {
+		printf("getblkx: size(%d) > maxbcachebuf(%d)\n", size,
 		    maxbcachebuf);
+		return (EIO);
+	}
 	if (!unmapped_buf_allowed)
 		flags &= ~(GB_UNMAPPED | GB_KVAALLOC);
 
@@ -4161,6 +4163,12 @@ newbuf_unlocked:
 		vmio = vp->v_object != NULL;
 		if (vmio) {
 			maxsize = size + (offset & PAGE_MASK);
+			if (maxsize > maxbcachebuf) {
+				printf(
+			    "getblkx: maxsize(%d) > maxbcachebuf(%d)\n",
+				    maxsize, maxbcachebuf);
+				return (EIO);
+			}
 		} else {
 			maxsize = size;
 			/* Do not allow non-VMIO notmapped buffers. */