diff --git a/sys/dev/mpt/mpt_cam.c b/sys/dev/mpt/mpt_cam.c
--- a/sys/dev/mpt/mpt_cam.c
+++ b/sys/dev/mpt/mpt_cam.c
@@ -2448,6 +2448,7 @@
 				    "XPT_REL_SIMQ");
 				break;
 			}
+			memset(&crs, 0, sizeof(crs));
 			xpt_setup_ccb(&crs.ccb_h, tmppath, 5);
 			crs.ccb_h.func_code = XPT_REL_SIMQ;
 			crs.ccb_h.flags = CAM_DEV_QFREEZE;
diff --git a/sys/dev/mpt/mpt_raid.c b/sys/dev/mpt/mpt_raid.c
--- a/sys/dev/mpt/mpt_raid.c
+++ b/sys/dev/mpt/mpt_raid.c
@@ -296,6 +296,7 @@
 		goto cleanup;
 	}
 
+	memset(&csa, 0, sizeof(csa));
 	xpt_setup_ccb(&csa.ccb_h, mpt->path, 5);
 	csa.ccb_h.func_code = XPT_SASYNC_CB;
 	csa.event_enable = AC_FOUND_DEVICE;
@@ -336,6 +337,7 @@
 	handler.reply_handler = mpt_raid_reply_handler;
 	mpt_deregister_handler(mpt, MPT_HANDLER_REPLY, handler,
 			       raid_handler_id);
+	memset(&csa, 0, sizeof(csa));
 	xpt_setup_ccb(&csa.ccb_h, mpt->path, /*priority*/5);
 	csa.ccb_h.func_code = XPT_SASYNC_CB;
 	csa.event_enable = 0;
@@ -1071,6 +1073,7 @@
 {
 	struct ccb_relsim crs;
 
+	memset(&crs, 0, sizeof(crs));
 	xpt_setup_ccb(&crs.ccb_h, path, /*priority*/5);
 	crs.ccb_h.func_code = XPT_REL_SIMQ;
 	crs.ccb_h.flags = CAM_DEV_QFREEZE;