Index: lib/asan/asan_rtl.cc
===================================================================
--- lib/asan/asan_rtl.cc
+++ lib/asan/asan_rtl.cc
@@ -377,6 +377,8 @@
   // initialization steps look at flags().
   InitializeFlags();
 
+  CheckVMASize();
+
   AsanCheckIncompatibleRT();
   AsanCheckDynamicRTPrereqs();
 
@@ -585,7 +587,6 @@
 // Initialize as requested from instrumented application code.
 // We use this call as a trigger to wake up ASan from deactivated state.
 void __asan_init() {
-  CheckVMASize();
   AsanActivate();
   AsanInitInternal();
 }
Index: lib/dfsan/dfsan.cc
===================================================================
--- lib/dfsan/dfsan.cc
+++ lib/dfsan/dfsan.cc
@@ -399,6 +399,8 @@
 }
 
 static void dfsan_init(int argc, char **argv, char **envp) {
+  InitializeFlags();
+
   CheckVMASize();
 
   MmapFixedNoReserve(kShadowAddr, kUnusedAddr - kShadowAddr);
@@ -412,7 +414,6 @@
   if (!(init_addr >= kUnusedAddr && init_addr < kAppAddr))
     MmapNoAccess(kUnusedAddr, kAppAddr - kUnusedAddr);
 
-  InitializeFlags();
   InitializeInterceptors();
 
   // Register the fini callback to run when the program terminates successfully
Index: lib/msan/msan.cc
===================================================================
--- lib/msan/msan.cc
+++ lib/msan/msan.cc
@@ -375,12 +375,13 @@
   msan_init_is_running = 1;
   SanitizerToolName = "MemorySanitizer";
 
-  CheckVMASize();
-
   InitTlsSize();
 
   CacheBinaryName();
   InitializeFlags();
+
+  CheckVMASize();
+
   __sanitizer_set_report_path(common_flags()->log_path);
 
   InitializeInterceptors();
Index: lib/tsan/rtl/tsan_rtl.cc
===================================================================
--- lib/tsan/rtl/tsan_rtl.cc
+++ lib/tsan/rtl/tsan_rtl.cc
@@ -312,9 +312,6 @@
   if (is_initialized)
     return;
   is_initialized = true;
-
-  CheckVMASize();
-
   // We are not ready to handle interceptors yet.
   ScopedIgnoreInterceptors ignore;
   SanitizerToolName = "ThreadSanitizer";
@@ -325,6 +322,7 @@
   const char *options = GetEnv(kTsanOptionsEnv);
   CacheBinaryName();
   InitializeFlags(&ctx->flags, options);
+  CheckVMASize();
 #ifndef SANITIZER_GO
   InitializeAllocator();
 #endif