diff --git a/linker/dlfcn.cpp b/linker/dlfcn.cpp
index 228e30a..ec6850a 100644
--- a/linker/dlfcn.cpp
+++ b/linker/dlfcn.cpp
@@ -279,10 +279,12 @@
 }
 
 android_namespace_t* __loader_android_get_exported_namespace(const char* name) {
+  ScopedPthreadMutexLocker locker(&g_dl_mutex);
   return get_exported_namespace(name);
 }
 
 void __loader_cfi_fail(uint64_t CallSiteTypeId, void* Ptr, void *DiagData, void *CallerPc) {
+  ScopedPthreadMutexLocker locker(&g_dl_mutex);
   CFIShadowWriter::CfiFail(CallSiteTypeId, Ptr, DiagData, CallerPc);
 }