diff --git a/libbpf_android/BpfUtils.cpp b/libbpf_android/BpfUtils.cpp
index 9f482d6..f5741bb 100644
--- a/libbpf_android/BpfUtils.cpp
+++ b/libbpf_android/BpfUtils.cpp
@@ -23,6 +23,7 @@
 #include <linux/bpf.h>
 #include <linux/if_ether.h>
 #include <linux/in.h>
+#include <linux/pfkeyv2.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mman.h>
@@ -43,7 +44,9 @@
 using android::netdutils::MemBlock;
 using android::netdutils::Slice;
 
-constexpr size_t LOG_BUF_SIZE = 65536;
+// The buffer size for the buffer that records program loading logs, needs to be large enough for
+// the largest kernel program.
+constexpr size_t LOG_BUF_SIZE = 0x20000;
 
 namespace android {
 namespace bpf {
@@ -212,6 +215,27 @@
     return sock_cookie;
 }
 
+int synchronizeKernelRCU() {
+    // This is a temporary hack for network stats map swap on devices running
+    // 4.9 kernels. The kernel code of socket release on pf_key socket will
+    // explicitly call synchronize_rcu() which is exactly what we need.
+    int pfSocket = socket(AF_KEY, SOCK_RAW | SOCK_CLOEXEC, PF_KEY_V2);
+
+    if (pfSocket < 0) {
+        int ret = -errno;
+        ALOGE("create PF_KEY socket failed: %s", strerror(errno));
+        return ret;
+    }
+
+    // When closing socket, synchronize_rcu() gets called in sock_release().
+    if (close(pfSocket)) {
+        int ret = -errno;
+        ALOGE("failed to close the PF_KEY socket: %s", strerror(errno));
+        return ret;
+    }
+    return 0;
+}
+
 bool hasBpfSupport() {
     struct utsname buf;
     int kernel_version_major;