Index: head/sys/dev/nvdimm/nvdimm_spa.c
===================================================================
--- head/sys/dev/nvdimm/nvdimm_spa.c
+++ head/sys/dev/nvdimm/nvdimm_spa.c
@@ -177,6 +177,7 @@
 	error = 0;
 	if (dev->spa_kva == NULL) {
 		mattr = nvdimm_spa_memattr(dev);
+		bzero(&m, sizeof(m));
 		vm_page_initfake(&m, 0, mattr);
 		ma = &m;
 		while (uio->uio_resid > 0) {
@@ -276,7 +277,7 @@
 
 	mattr = nvdimm_spa_memattr(dev);
 	for (i = 0; i < nitems(ma); i++) {
-		maa[i].flags = 0;
+		bzero(&maa[i], sizeof(maa[i]));
 		vm_page_initfake(&maa[i], dev->spa_phys_base +
 		    trunc_page(bp->bio_offset) + PAGE_SIZE * i, mattr);
 		ma[i] = &maa[i];
Index: head/sys/x86/iommu/busdma_dmar.c
===================================================================
--- head/sys/x86/iommu/busdma_dmar.c
+++ head/sys/x86/iommu/busdma_dmar.c
@@ -689,7 +689,7 @@
 			 */
 			if (fma == NULL) {
 				fma = malloc(sizeof(struct vm_page) * ma_cnt,
-				    M_DEVBUF, mflags);
+				    M_DEVBUF, M_ZERO | mflags);
 				if (fma == NULL) {
 					free(ma, M_DEVBUF);
 					return (ENOMEM);
@@ -743,7 +743,7 @@
 			 */
 			if (fma == NULL) {
 				fma = malloc(sizeof(struct vm_page) * ma_cnt,
-				    M_DEVBUF, mflags);
+				    M_DEVBUF, M_ZERO | mflags);
 				if (fma == NULL) {
 					free(ma, M_DEVBUF);
 					return (ENOMEM);