Index: lib/asan/asan_rtl.cc
===================================================================
--- lib/asan/asan_rtl.cc
+++ lib/asan/asan_rtl.cc
@@ -383,12 +383,14 @@
           kHighShadowBeg > kMidMemEnd);
 }
 
+#if !defined(__thumb__)
 static bool UNUSED __local_asan_dyninit = [] {
   MaybeStartBackgroudThread();
   SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
 
   return false;
 }();
+#endif
 
 static void AsanInitInternal() {
   if (LIKELY(asan_inited)) return;
@@ -464,6 +466,11 @@
   allocator_options.SetFrom(flags(), common_flags());
   InitializeAllocator(allocator_options);
 
+#if defined(__thumb__)
+  MaybeStartBackgroudThread();
+  SetSoftRssLimitExceededCallback(AsanSoftRssLimitExceededCallback);
+#endif
+
   // On Linux AsanThread::ThreadStart() calls malloc() that's why asan_inited
   // should be set to 1 prior to initializing the threads.
   asan_inited = 1;
Index: test/asan/TestCases/Linux/quarantine_size_mb.cc
===================================================================
--- test/asan/TestCases/Linux/quarantine_size_mb.cc
+++ test/asan/TestCases/Linux/quarantine_size_mb.cc
@@ -7,7 +7,7 @@
 // RUN: %env_asan_opts=hard_rss_limit_mb=20                         not  %run %t          2>&1 | FileCheck %s  --check-prefix=RSS_LIMIT
 
 // https://github.com/google/sanitizers/issues/981
-// UNSUPPORTED: android-26, arm
+// UNSUPPORTED: android-26
 
 #include <string.h>
 char *g;
Index: test/sanitizer_common/TestCases/hard_rss_limit_mb_test.cc
===================================================================
--- test/sanitizer_common/TestCases/hard_rss_limit_mb_test.cc
+++ test/sanitizer_common/TestCases/hard_rss_limit_mb_test.cc
@@ -16,7 +16,7 @@
 // XFAIL: msan
 // XFAIL: ubsan
 
-// UNSUPPORTED: freebsd, solaris, darwin, arm
+// UNSUPPORTED: freebsd, solaris, darwin
 
 #include <string.h>
 #include <stdio.h>