diff --git a/qa/suites/fs/verify/validater/valgrind.yaml b/qa/suites/fs/verify/validater/valgrind.yaml
index b3e2339821b..ae2eced9aa0 100644
--- a/qa/suites/fs/verify/validater/valgrind.yaml
+++ b/qa/suites/fs/verify/validater/valgrind.yaml
@@ -1,3 +1,5 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
 
 # Valgrind makes everything slow, so ignore slow requests
 overrides:
diff --git a/qa/suites/rados/singleton-nomsgr/all/valgrind-leaks.yaml b/qa/suites/rados/singleton-nomsgr/all/valgrind-leaks.yaml
index fde0dbbe05b..e5d5702a32b 100644
--- a/qa/suites/rados/singleton-nomsgr/all/valgrind-leaks.yaml
+++ b/qa/suites/rados/singleton-nomsgr/all/valgrind-leaks.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 overrides:
   install:
     ceph:
diff --git a/qa/suites/rados/verify/validater/valgrind.yaml b/qa/suites/rados/verify/validater/valgrind.yaml
index dc63731b1d2..73f1e2e831d 100644
--- a/qa/suites/rados/verify/validater/valgrind.yaml
+++ b/qa/suites/rados/verify/validater/valgrind.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 overrides:
   install:
     ceph:
diff --git a/qa/suites/rbd/valgrind/validator/memcheck.yaml b/qa/suites/rbd/valgrind/validator/memcheck.yaml
index b8d328e8c08..c660dce623d 100644
--- a/qa/suites/rbd/valgrind/validator/memcheck.yaml
+++ b/qa/suites/rbd/valgrind/validator/memcheck.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 overrides:
   install:
     ceph:
diff --git a/qa/suites/rgw/multisite/tasks/test_multi.yaml b/qa/suites/rgw/multisite/tasks/test_multi.yaml
index 508c06a5270..a8f897873de 100644
--- a/qa/suites/rgw/multisite/tasks/test_multi.yaml
+++ b/qa/suites/rgw/multisite/tasks/test_multi.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 tasks:
 - install:
 - ceph: {cluster: c1}
diff --git a/qa/suites/rgw/multisite/valgrind.yaml b/qa/suites/rgw/multisite/valgrind.yaml
index 0b28c183065..76fe61e81ea 100644
--- a/qa/suites/rgw/multisite/valgrind.yaml
+++ b/qa/suites/rgw/multisite/valgrind.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 overrides:
   install:
     ceph:
diff --git a/qa/suites/rgw/verify/tasks/rgw_s3tests.yaml b/qa/suites/rgw/verify/tasks/rgw_s3tests.yaml
index 851b67be6c6..bed9f0e1900 100644
--- a/qa/suites/rgw/verify/tasks/rgw_s3tests.yaml
+++ b/qa/suites/rgw/verify/tasks/rgw_s3tests.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 tasks:
 - install:
     flavor: notcmalloc
diff --git a/qa/suites/rgw/verify/tasks/rgw_swift.yaml b/qa/suites/rgw/verify/tasks/rgw_swift.yaml
index 792fb848a9e..9b3aa6febdc 100644
--- a/qa/suites/rgw/verify/tasks/rgw_swift.yaml
+++ b/qa/suites/rgw/verify/tasks/rgw_swift.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 tasks:
 - install:
     flavor: notcmalloc
diff --git a/qa/suites/rgw/verify/validater/valgrind.yaml b/qa/suites/rgw/verify/validater/valgrind.yaml
index dc63731b1d2..73f1e2e831d 100644
--- a/qa/suites/rgw/verify/validater/valgrind.yaml
+++ b/qa/suites/rgw/verify/validater/valgrind.yaml
@@ -1,3 +1,6 @@
+# see http://tracker.ceph.com/issues/20360 and http://tracker.ceph.com/issues/18126
+os_type: centos
+
 overrides:
   install:
     ceph: