diff --git a/src/test/obj_sync/TEST0 b/src/test/obj_sync/TEST0
index 824a32eae8f..570b86a6b8f 100755
--- a/src/test/obj_sync/TEST0
+++ b/src/test/obj_sync/TEST0
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: BSD-3-Clause
-# Copyright 2015-2019, Intel Corporation
+# Copyright 2015-2023, Intel Corporation
 
 #
 # src/test/obj_sync/TEST0 -- unit test for PMEM-resident locks
@@ -12,6 +12,9 @@ require_test_type medium
 
 require_fs_type none
 require_build_type debug nondebug
+# XXX disable the test for 'pmemcheck'
+# until https://github.com/pmem/pmdk/issues/5643 is fixed.
+configure_valgrind pmemcheck force-disable
 
 setup
 
diff --git a/src/test/obj_sync/TEST2 b/src/test/obj_sync/TEST2
index cda7a4dc13f..130e6991ab6 100755
--- a/src/test/obj_sync/TEST2
+++ b/src/test/obj_sync/TEST2
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: BSD-3-Clause
-# Copyright 2015-2019, Intel Corporation
+# Copyright 2015-2023, Intel Corporation
 
 #
 # src/test/obj_sync/TEST2 -- unit test for PMEM-resident locks
@@ -12,8 +12,12 @@ require_test_type medium
 
 require_fs_type none
 require_build_type debug nondebug
-require_valgrind 3.10
-configure_valgrind helgrind force-enable
+# XXX disable the test for 'drd' and  'helgrind'
+# until https://github.com/pmem/pmdk/issues/5646 is fixed.
+#require_valgrind 3.10
+#configure_valgrind helgrind force-enable
+configure_valgrind drd force-disable
+configure_valgrind helgrind force-disable
 
 setup
 
diff --git a/src/test/obj_sync/TEST5 b/src/test/obj_sync/TEST5
index fc13b065c16..53a7bbe2fe7 100755
--- a/src/test/obj_sync/TEST5
+++ b/src/test/obj_sync/TEST5
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: BSD-3-Clause
-# Copyright 2015-2019, Intel Corporation
+# Copyright 2015-2023, Intel Corporation
 
 #
 # src/test/obj_sync/TEST5 -- unit test for PMEM-resident locks
@@ -12,8 +12,12 @@ require_test_type medium
 
 require_fs_type none
 require_build_type debug nondebug
-require_valgrind 3.10
-configure_valgrind drd force-enable
+# XXX disable the test for 'drd' and 'helgrind'
+# until https://github.com/pmem/pmdk/issues/5646 is fixed.
+#require_valgrind 3.10
+#configure_valgrind drd force-enable
+configure_valgrind drd force-disable
+configure_valgrind helgrind force-disable
 setup
 
 expect_normal_exit ./obj_sync$EXESUFFIX c 10 5
diff --git a/src/test/obj_sync/TEST6 b/src/test/obj_sync/TEST6
index 8c11d2ad23f..bf720bb57c6 100755
--- a/src/test/obj_sync/TEST6
+++ b/src/test/obj_sync/TEST6
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: BSD-3-Clause
-# Copyright 2015-2019, Intel Corporation
+# Copyright 2015-2023, Intel Corporation
 
 #
 # src/test/obj_sync/TEST6 -- unit test for PMEM-resident locks
@@ -12,8 +12,12 @@ require_test_type medium
 
 require_fs_type none
 require_build_type debug nondebug
-require_valgrind 3.10
-configure_valgrind helgrind force-enable
+# XXX disable the test for 'drd' and 'helgrind'
+# until https://github.com/pmem/pmdk/issues/5646 is fixed.
+#require_valgrind 3.10
+#configure_valgrind helgrind force-enable
+configure_valgrind drd force-disable
+configure_valgrind helgrind force-disable
 setup
 
 expect_normal_exit ./obj_sync$EXESUFFIX c 10 5