diff --git a/libprocessgroup/task_profiles.cpp b/libprocessgroup/task_profiles.cpp
index 40d8d90..edc316a 100644
--- a/libprocessgroup/task_profiles.cpp
+++ b/libprocessgroup/task_profiles.cpp
@@ -150,6 +150,7 @@
 }
 
 void SetCgroupAction::EnableResourceCaching() {
+    std::lock_guard<std::mutex> lock(fd_mutex_);
     if (fd_ != FDS_NOT_CACHED) {
         return;
     }
@@ -191,6 +192,7 @@
 }
 
 bool SetCgroupAction::ExecuteForProcess(uid_t uid, pid_t pid) const {
+    std::lock_guard<std::mutex> lock(fd_mutex_);
     if (IsFdValid()) {
         // fd is cached, reuse it
         if (!AddTidToCgroup(pid, fd_)) {
@@ -221,6 +223,7 @@
 }
 
 bool SetCgroupAction::ExecuteForTask(int tid) const {
+    std::lock_guard<std::mutex> lock(fd_mutex_);
     if (IsFdValid()) {
         // fd is cached, reuse it
         if (!AddTidToCgroup(tid, fd_)) {
diff --git a/libprocessgroup/task_profiles.h b/libprocessgroup/task_profiles.h
index 445647d..77bac2d 100644
--- a/libprocessgroup/task_profiles.h
+++ b/libprocessgroup/task_profiles.h
@@ -19,6 +19,7 @@
 #include <sys/cdefs.h>
 #include <sys/types.h>
 #include <map>
+#include <mutex>
 #include <string>
 #include <vector>
 
@@ -127,6 +128,7 @@
     CgroupController controller_;
     std::string path_;
     android::base::unique_fd fd_;
+    mutable std::mutex fd_mutex_;
 
     static bool IsAppDependentPath(const std::string& path);
     static bool AddTidToCgroup(int tid, int fd);