diff --git a/module/os/freebsd/spl/spl_kstat.c b/module/os/freebsd/spl/spl_kstat.c
index 655fe5a626..f215751420 100644
--- a/module/os/freebsd/spl/spl_kstat.c
+++ b/module/os/freebsd/spl/spl_kstat.c
@@ -349,50 +349,50 @@ kstat_install_named(kstat_t *ksp)
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_S32 | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl, "I", namelast);
+			    CTLTYPE_S32 | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl, "I", namelast);
 			break;
 		case KSTAT_DATA_UINT32:
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_U32 | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl, "IU", namelast);
+			    CTLTYPE_U32 | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl, "IU", namelast);
 			break;
 		case KSTAT_DATA_INT64:
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_S64 | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl, "Q", namelast);
+			    CTLTYPE_S64 | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl, "Q", namelast);
 			break;
 		case KSTAT_DATA_UINT64:
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_U64 | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl, "QU", namelast);
+			    CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl, "QU", namelast);
 			break;
 		case KSTAT_DATA_LONG:
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_LONG | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl, "L", namelast);
+			    CTLTYPE_LONG | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl, "L", namelast);
 			break;
 		case KSTAT_DATA_ULONG:
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_ULONG | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl, "LU", namelast);
+			    CTLTYPE_ULONG | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl, "LU", namelast);
 			break;
 		case KSTAT_DATA_STRING:
 			SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, namelast,
-			    CTLTYPE_STRING | CTLFLAG_RD, ksp, i,
-			    kstat_sysctl_string, "A", namelast);
+			    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, i, kstat_sysctl_string, "A", namelast);
 			break;
 		default:
 			panic("unsupported type: %d", typelast);
@@ -417,14 +417,14 @@ kstat_install(kstat_t *ksp)
 			root = SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, ksp->ks_name,
-			    CTLTYPE_STRING | CTLFLAG_RD, ksp, 0,
-			    kstat_sysctl_raw, "A", ksp->ks_name);
+			    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, 0, kstat_sysctl_raw, "A", ksp->ks_name);
 		} else {
 			root = SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 			    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 			    OID_AUTO, ksp->ks_name,
-			    CTLTYPE_OPAQUE | CTLFLAG_RD, ksp, 0,
-			    kstat_sysctl_raw, "", ksp->ks_name);
+			    CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE,
+			    ksp, 0, kstat_sysctl_raw, "", ksp->ks_name);
 		}
 		VERIFY(root != NULL);
 		break;
@@ -432,8 +432,8 @@ kstat_install(kstat_t *ksp)
 		root = SYSCTL_ADD_PROC(&ksp->ks_sysctl_ctx,
 		    SYSCTL_CHILDREN(ksp->ks_sysctl_root),
 		    OID_AUTO, ksp->ks_name,
-		    CTLTYPE_STRING | CTLFLAG_RD, ksp, 0,
-		    kstat_sysctl_io, "A", ksp->ks_name);
+		    CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE,
+		    ksp, 0, kstat_sysctl_io, "A", ksp->ks_name);
 		break;
 	case KSTAT_TYPE_TIMER:
 	case KSTAT_TYPE_INTR:
diff --git a/module/os/freebsd/zfs/sysctl_os.c b/module/os/freebsd/zfs/sysctl_os.c
index b3cb7e7e43..c9b350a540 100644
--- a/module/os/freebsd/zfs/sysctl_os.c
+++ b/module/os/freebsd/zfs/sysctl_os.c
@@ -243,8 +243,9 @@ sysctl_vfs_zfs_arc_no_grow_shift(SYSCTL_HANDLER_ARGS)
 	return (0);
 }
 
-SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_no_grow_shift, CTLTYPE_U32 | CTLFLAG_RWTUN,
-    0, sizeof (uint32_t), sysctl_vfs_zfs_arc_no_grow_shift, "U",
+SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_no_grow_shift,
+    CTLTYPE_U32 | CTLFLAG_RWTUN | CTLFLAG_MPSAFE, 0, sizeof (uint32_t),
+    sysctl_vfs_zfs_arc_no_grow_shift, "U",
     "log2(fraction of ARC which must be free to allow growing)");
 
 int
@@ -275,10 +276,12 @@ param_set_arc_int(SYSCTL_HANDLER_ARGS)
 	return (0);
 }
 
-SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_min, CTLTYPE_ULONG | CTLFLAG_RWTUN,
+SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_min,
+    CTLTYPE_ULONG | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
     &zfs_arc_min, sizeof (zfs_arc_min), param_set_arc_long, "LU",
     "min arc size (LEGACY)");
-SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_max, CTLTYPE_ULONG | CTLFLAG_RWTUN,
+SYSCTL_PROC(_vfs_zfs, OID_AUTO, arc_max,
+    CTLTYPE_ULONG | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
     &zfs_arc_max, sizeof (zfs_arc_max), param_set_arc_long, "LU",
     "max arc size (LEGACY)");
 
@@ -558,11 +561,13 @@ param_set_max_auto_ashift(SYSCTL_HANDLER_ARGS)
 	return (0);
 }
 
-SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift, CTLTYPE_U64 | CTLFLAG_RWTUN,
+SYSCTL_PROC(_vfs_zfs, OID_AUTO, min_auto_ashift,
+    CTLTYPE_U64 | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
     &zfs_vdev_min_auto_ashift, sizeof (zfs_vdev_min_auto_ashift),
     param_set_min_auto_ashift, "QU",
     "Min ashift used when creating new top-level vdev. (LEGACY)");
-SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift, CTLTYPE_U64 | CTLFLAG_RWTUN,
+SYSCTL_PROC(_vfs_zfs, OID_AUTO, max_auto_ashift,
+    CTLTYPE_U64 | CTLFLAG_RWTUN | CTLFLAG_MPSAFE,
     &zfs_vdev_max_auto_ashift, sizeof (zfs_vdev_max_auto_ashift),
     param_set_max_auto_ashift, "QU",
     "Max ashift used when optimizing for logical -> physical sector size on "