diff --git a/compiler-rt/lib/asan/asan_interface.inc b/compiler-rt/lib/asan/asan_interface.inc
index 997d5c126c718..9480104398276 100644
--- a/compiler-rt/lib/asan/asan_interface.inc
+++ b/compiler-rt/lib/asan/asan_interface.inc
@@ -14,7 +14,6 @@ INTERFACE_FUNCTION(__asan_alloca_poison)
 INTERFACE_FUNCTION(__asan_allocas_unpoison)
 INTERFACE_FUNCTION(__asan_before_dynamic_init)
 INTERFACE_FUNCTION(__asan_describe_address)
-INTERFACE_FUNCTION(__asan_detect_use_after_return_always)
 INTERFACE_FUNCTION(__asan_exp_load1)
 INTERFACE_FUNCTION(__asan_exp_load2)
 INTERFACE_FUNCTION(__asan_exp_load4)
diff --git a/compiler-rt/lib/asan/asan_rtl.cpp b/compiler-rt/lib/asan/asan_rtl.cpp
index 2d869554b41b0..e715d7742289c 100644
--- a/compiler-rt/lib/asan/asan_rtl.cpp
+++ b/compiler-rt/lib/asan/asan_rtl.cpp
@@ -23,12 +23,11 @@
 #include "asan_stats.h"
 #include "asan_suppressions.h"
 #include "asan_thread.h"
-#include "lsan/lsan_common.h"
 #include "sanitizer_common/sanitizer_atomic.h"
 #include "sanitizer_common/sanitizer_flags.h"
-#include "sanitizer_common/sanitizer_internal_defs.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_symbolizer.h"
+#include "lsan/lsan_common.h"
 #include "ubsan/ubsan_init.h"
 #include "ubsan/ubsan_platform.h"
 
@@ -36,17 +35,6 @@ uptr __asan_shadow_memory_dynamic_address;  // Global interface symbol.
 int __asan_option_detect_stack_use_after_return;  // Global interface symbol.
 uptr *__asan_test_only_reported_buggy_pointer;  // Used only for testing asan.
 
-#if !SANITIZER_WINDOWS
-// Instrumented code can set this value in terms of -asan_use_after_return
-//  * __asan_detect_use_after_return_always is undefined: all instrumented
-//    modules either compiled with asan_use_after_return 1 (runtime) or 0
-//    (never)
-//  * __asan_detect_use_after_return_always is defined: at least one of modules
-//    compiled with asan_use_after_return 2 (always)
-extern "C" SANITIZER_WEAK_ATTRIBUTE const int
-    __asan_detect_use_after_return_always;
-#endif  // !SANITIZER_WINDOWS
-
 namespace __asan {
 
 uptr AsanMappingProfile[kAsanMappingProfileSize];
@@ -398,17 +386,6 @@ static bool UNUSED __local_asan_dyninit = [] {
 }();
 #endif
 
-static void InitAsanOptionDetectStackUseAfterReturn() {
-  __asan_option_detect_stack_use_after_return =
-      flags()->detect_stack_use_after_return;
-#if !SANITIZER_WINDOWS
-  if (&__asan_detect_use_after_return_always) {
-    CHECK_EQ(1, __asan_detect_use_after_return_always);
-    __asan_option_detect_stack_use_after_return = 1;
-  }
-#endif  // !SANITIZER_WINDOWS
-}
-
 static void AsanInitInternal() {
   if (LIKELY(asan_inited)) return;
   SanitizerToolName = "AddressSanitizer";
@@ -450,7 +427,8 @@ static void AsanInitInternal() {
 
   __sanitizer_set_report_path(common_flags()->log_path);
 
-  InitAsanOptionDetectStackUseAfterReturn();
+  __asan_option_detect_stack_use_after_return =
+      flags()->detect_stack_use_after_return;
 
   __sanitizer::InitializePlatformEarly();
 
diff --git a/compiler-rt/lib/asan/weak_symbols.txt b/compiler-rt/lib/asan/weak_symbols.txt
index 8d66f114aaa6e..fe680f8a9a4f6 100644
--- a/compiler-rt/lib/asan/weak_symbols.txt
+++ b/compiler-rt/lib/asan/weak_symbols.txt
@@ -1,6 +1,5 @@
 ___asan_default_options
 ___asan_default_suppressions
-___asan_detect_use_after_return_always
 ___asan_on_error
 ___asan_set_shadow_00
 ___asan_set_shadow_f1
diff --git a/compiler-rt/test/asan/TestCases/Linux/uar_signals.cpp b/compiler-rt/test/asan/TestCases/Linux/uar_signals.cpp
index 71671e66b577a..f96a2fecb367e 100644
--- a/compiler-rt/test/asan/TestCases/Linux/uar_signals.cpp
+++ b/compiler-rt/test/asan/TestCases/Linux/uar_signals.cpp
@@ -1,8 +1,6 @@
 // This test checks that the implementation of use-after-return
 // is async-signal-safe.
 // RUN: %clangxx_asan -std=c++11 -O1 %s -o %t -pthread && %run %t
-// RUN: %clangxx_asan -std=c++11 -O1 %s -o %t -pthread -mllvm -asan-use-after-return=never && %run %t
-// RUN: %clangxx_asan -std=c++11 -O1 %s -o %t -pthread -mllvm -asan-use-after-return=always && %run %t
 // REQUIRES: stable-runtime
 #include <signal.h>
 #include <stdlib.h>
diff --git a/compiler-rt/test/asan/TestCases/Posix/stack-use-after-return.cpp b/compiler-rt/test/asan/TestCases/Posix/stack-use-after-return.cpp
index 1deee8f1cd397..bb7f84309384b 100644
--- a/compiler-rt/test/asan/TestCases/Posix/stack-use-after-return.cpp
+++ b/compiler-rt/test/asan/TestCases/Posix/stack-use-after-return.cpp
@@ -3,32 +3,16 @@
 // RUN: %clangxx_asan  -O2 %s -pthread -o %t && %env_asan_opts=detect_stack_use_after_return=1 not %run %t 2>&1 | FileCheck %s
 // RUN: %clangxx_asan  -O3 %s -pthread -o %t && %env_asan_opts=detect_stack_use_after_return=1 not %run %t 2>&1 | FileCheck %s
 // RUN: %env_asan_opts=detect_stack_use_after_return=0 %run %t
-// RUN: %clangxx_asan  -O0 %s -pthread -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan  -O1 %s -pthread -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan  -O2 %s -pthread -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan  -O3 %s -pthread -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan  -O3 %s -pthread -o %t -mllvm -asan-use-after-return=never && %run %t
 // Regression test for a CHECK failure with small stack size and large frame.
 // RUN: %clangxx_asan  -O3 %s -pthread -o %t -DkSize=10000 -DUseThread -DkStackSize=131072 && %env_asan_opts=detect_stack_use_after_return=1 not %run %t 2>&1 | FileCheck --check-prefix=THREAD %s
-// RUN: %clangxx_asan  -O3 %s -pthread -o %t -DkSize=10000 -DUseThread -DkStackSize=131072 -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck --check-prefix=THREAD %s
 //
-// Test that we can find UAR in a thread other than main (UAR mode: runtime):
+// Test that we can find UAR in a thread other than main:
 // RUN: %clangxx_asan  -DUseThread -O2 %s -pthread -o %t && %env_asan_opts=detect_stack_use_after_return=1 not %run %t 2>&1 | FileCheck --check-prefix=THREAD %s
 //
 // Test the max_uar_stack_size_log/min_uar_stack_size_log flag.
-// (uses the previous)
 //
 // RUN: %env_asan_opts=detect_stack_use_after_return=1:max_uar_stack_size_log=20:verbosity=1 not %run %t 2>&1 | FileCheck --check-prefix=CHECK-20 %s
 // RUN: %env_asan_opts=detect_stack_use_after_return=1:min_uar_stack_size_log=24:max_uar_stack_size_log=24:verbosity=1 not %run %t 2>&1 | FileCheck --check-prefix=CHECK-24 %s
-//
-// Test that we can find UAR in a thread other than main (UAR mode: always):
-// RUN: %clangxx_asan  -DUseThread -O2 %s -pthread -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck --check-prefix=THREAD %s
-//
-// Test the max_uar_stack_size_log/min_uar_stack_size_log flag.
-// (uses the previous)
-//
-// RUN: %env_asan_opts=max_uar_stack_size_log=20:verbosity=1 not %run %t 2>&1 | FileCheck --check-prefix=CHECK-20 %s
-// RUN: %env_asan_opts=min_uar_stack_size_log=24:max_uar_stack_size_log=24:verbosity=1 not %run %t 2>&1 | FileCheck --check-prefix=CHECK-24 %s
 
 // This test runs out of stack on AArch64.
 // UNSUPPORTED: aarch64
@@ -105,7 +89,7 @@ int main(int argc, char **argv) {
       fprintf(stderr, "pthread_attr_setstacksize returned %d\n", ret);
       abort();
     }
-
+    
     size_t stacksize_check;
     ret = pthread_attr_getstacksize(&attr, &stacksize_check);
     if (ret != 0) {
@@ -116,7 +100,7 @@ int main(int argc, char **argv) {
     if (stacksize_check != desired_stack_size) {
       fprintf(stderr, "Unable to set stack size to %d, the stack size is %d.\n",
               (int)desired_stack_size, (int)stacksize_check);
-      abort();
+      abort(); 
     }
   }
   pthread_t t;
diff --git a/compiler-rt/test/asan/TestCases/heavy_uar_test.cpp b/compiler-rt/test/asan/TestCases/heavy_uar_test.cpp
index 3a615fea476de..a203174e0ae07 100644
--- a/compiler-rt/test/asan/TestCases/heavy_uar_test.cpp
+++ b/compiler-rt/test/asan/TestCases/heavy_uar_test.cpp
@@ -1,7 +1,5 @@
 // RUN: %clangxx_asan -O0 %s -o %t && %env_asan_opts=detect_stack_use_after_return=1 not %run %t 2>&1 | FileCheck %s
 // RUN: %clangxx_asan -O2 %s -o %t && %env_asan_opts=detect_stack_use_after_return=1 not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan -O0 %s -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck %s
-// RUN: %clangxx_asan -O2 %s -o %t -mllvm -asan-use-after-return=always && not %run %t 2>&1 | FileCheck %s
 // XFAIL: windows-msvc
 
 // FIXME: Fix this test under GCC.
diff --git a/compiler-rt/test/asan/TestCases/pass-struct-byval-uar.cpp b/compiler-rt/test/asan/TestCases/pass-struct-byval-uar.cpp
index 650a5de89bead..aa6fa579e183c 100644
--- a/compiler-rt/test/asan/TestCases/pass-struct-byval-uar.cpp
+++ b/compiler-rt/test/asan/TestCases/pass-struct-byval-uar.cpp
@@ -4,10 +4,6 @@
 // RUN:     FileCheck --check-prefix=CHECK-NO-UAR %s
 // RUN: not %env_asan_opts=detect_stack_use_after_return=1 %run %t 2>&1 | \
 // RUN:     FileCheck --check-prefix=CHECK-UAR %s
-// RUN: %clangxx_asan -O0 %s -o %t -mllvm -asan-use-after-return=never && \
-// RUN:     %run %t 2>&1 | FileCheck --check-prefix=CHECK-NO-UAR %s
-// RUN: %clangxx_asan -O0 %s -o %t -mllvm -asan-use-after-return=always && \
-// RUN:     not %run %t 2>&1 | FileCheck --check-prefix=CHECK-UAR %s
 //
 // On several architectures, the IR does not use byval arguments for foo() and
 // instead creates a copy in main() and gives foo() a pointer to the copy.  In
diff --git a/compiler-rt/test/asan/TestCases/scariness_score_test.cpp b/compiler-rt/test/asan/TestCases/scariness_score_test.cpp
index 2c6ae85fc27e1..b60122541cc3c 100644
--- a/compiler-rt/test/asan/TestCases/scariness_score_test.cpp
+++ b/compiler-rt/test/asan/TestCases/scariness_score_test.cpp
@@ -1,6 +1,5 @@
 // Test how we produce the scariness score.
 
-// UAR Mode: runtime
 // RUN: %clangxx_asan -O0 %s -o %t
 // On OSX and Windows, alloc_dealloc_mismatch=1 isn't 100% reliable, so it's
 // off by default. It's safe for these tests, though, so we turn it on.
@@ -34,41 +33,6 @@
 // RUN: not %run %t 25 2>&1 | FileCheck %s --check-prefix=CHECK25
 // RUN: not %run %t 26 2>&1 | FileCheck %s --check-prefix=CHECK26
 // RUN: not %run %t 27 2>&1 | FileCheck %s --check-prefix=CHECK27
-//
-// UAR Mode: always
-// RUN: %clangxx_asan -O0 %s -o %t -mllvm -asan-use-after-return=always
-// On OSX and Windows, alloc_dealloc_mismatch=1 isn't 100% reliable, so it's
-// off by default. It's safe for these tests, though, so we turn it on.
-// RUN: export %env_asan_opts=handle_abort=1:print_scariness=1:alloc_dealloc_mismatch=1
-// Make sure the stack is limited (may not be the default under GNU make)
-// RUN: ulimit -s 4096
-// RUN: not %run %t  1 2>&1 | FileCheck %s --check-prefix=CHECK1
-// RUN: not %run %t  2 2>&1 | FileCheck %s --check-prefix=CHECK2
-// RUN: not %run %t  3 2>&1 | FileCheck %s --check-prefix=CHECK3
-// RUN: not %run %t  4 2>&1 | FileCheck %s --check-prefix=CHECK4
-// RUN: not %run %t  5 2>&1 | FileCheck %s --check-prefix=CHECK5
-// RUN: not %run %t  6 2>&1 | FileCheck %s --check-prefix=CHECK6
-// RUN: not %run %t  7 2>&1 | FileCheck %s --check-prefix=CHECK7
-// RUN: not %run %t  8 2>&1 | FileCheck %s --check-prefix=CHECK8
-// RUN: not %run %t  9 2>&1 | FileCheck %s --check-prefix=CHECK9
-// RUN: not %run %t 10 2>&1 | FileCheck %s --check-prefix=CHECK10
-// RUN: not %run %t 11 2>&1 | FileCheck %s --check-prefix=CHECK11
-// RUN: not %run %t 12 2>&1 | FileCheck %s --check-prefix=CHECK12
-// RUN: not %run %t 13 2>&1 | FileCheck %s --check-prefix=CHECK13
-// RUN: not %run %t 14 2>&1 | FileCheck %s --check-prefix=CHECK14
-// RUN: not %run %t 15 2>&1 | FileCheck %s --check-prefix=CHECK15
-// RUN: not %run %t 16 2>&1 | FileCheck %s --check-prefix=CHECK16
-// RUN: not %run %t 17 2>&1 | FileCheck %s --check-prefix=CHECK17
-// RUN: not %run %t 18 2>&1 | FileCheck %s --check-prefix=CHECK18
-// RUN: not %run %t 19 2>&1 | FileCheck %s --check-prefix=CHECK19
-// RUN: not %run %t 20 2>&1 | FileCheck %s --check-prefix=CHECK20
-// RUN: not %run %t 21 2>&1 | FileCheck %s --check-prefix=CHECK21
-// RUN: not %run %t 22 2>&1 | FileCheck %s --check-prefix=CHECK22
-// RUN: not %run %t 23 2>&1 | FileCheck %s --check-prefix=CHECK23
-// RUN: not %run %t 24 2>&1 | FileCheck %s --check-prefix=CHECK24
-// RUN: not %run %t 25 2>&1 | FileCheck %s --check-prefix=CHECK25
-// RUN: not %run %t 26 2>&1 | FileCheck %s --check-prefix=CHECK26
-// RUN: not %run %t 27 2>&1 | FileCheck %s --check-prefix=CHECK27
 // Parts of the test are too platform-specific:
 // REQUIRES: x86_64-target-arch
 // REQUIRES: shell
diff --git a/compiler-rt/test/asan/TestCases/uar_and_exceptions.cpp b/compiler-rt/test/asan/TestCases/uar_and_exceptions.cpp
index b3a8fb476d3d4..2357ae803ac26 100644
--- a/compiler-rt/test/asan/TestCases/uar_and_exceptions.cpp
+++ b/compiler-rt/test/asan/TestCases/uar_and_exceptions.cpp
@@ -1,8 +1,6 @@
 // Test that use-after-return works with exceptions.
 // RUN: %clangxx_asan -O0 %s -o %t
 // RUN: %env_asan_opts=detect_stack_use_after_return=1 %run %t
-// RUN: %clangxx_asan -O0 %s -o %t -mllvm -asan-use-after-return=always
-// RUN: %run %t
 
 #include <stdio.h>
 
diff --git a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
index c64539a8fb983..82e8fb4489201 100644
--- a/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp
@@ -2645,18 +2645,6 @@ bool ModuleAddressSanitizer::instrumentModule(Module &M) {
       appendToGlobalDtors(M, AsanDtorFunction, Priority);
   }
 
-#if !SANITIZER_WINDOWS
-  assert(ClUseAfterReturn != AsanDetectStackUseAfterReturnMode::Invalid);
-  if (ClUseAfterReturn == AsanDetectStackUseAfterReturnMode::Always) {
-    Type *IntTy = Type::getInt32Ty(*C);
-    M.getOrInsertGlobal("__asan_detect_use_after_return_always", IntTy, [&] {
-      return new GlobalVariable(
-          M, IntTy, /*isConstant=*/true, GlobalValue::WeakODRLinkage,
-          ConstantInt::get(IntTy, 1), "__asan_detect_use_after_return_always");
-    });
-  }
-#endif // !SANITIZER_WINDOWS
-
   return true;
 }
 
diff --git a/llvm/test/Instrumentation/AddressSanitizer/fake-stack.ll b/llvm/test/Instrumentation/AddressSanitizer/fake-stack.ll
index d50743b5c2fa3..9a17a542f7176 100644
--- a/llvm/test/Instrumentation/AddressSanitizer/fake-stack.ll
+++ b/llvm/test/Instrumentation/AddressSanitizer/fake-stack.ll
@@ -1,13 +1,10 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt < %s -passes='asan-pipeline' -asan-use-after-return=0 -S | FileCheck %s --check-prefixes=CHECK,NEVER --implicit-check-not=__asan_detect_use_after_return_always
-; RUN: opt < %s -passes='asan-pipeline' -asan-use-after-return=1 -S | FileCheck %s --check-prefixes=CHECK,RUNTIME --implicit-check-not=__asan_detect_use_after_return_always
+; RUN: opt < %s -passes='asan-pipeline' -asan-use-after-return=0 -S | FileCheck %s --check-prefixes=CHECK,NEVER
+; RUN: opt < %s -passes='asan-pipeline' -asan-use-after-return=1 -S | FileCheck %s --check-prefixes=CHECK,RUNTIME
 ; RUN: opt < %s -passes='asan-pipeline' -asan-use-after-return=2 -S | FileCheck %s --check-prefixes=CHECK,ALWAYS
 target datalayout = "e-i64:64-f80:128-s:64-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
-; ALWAYS-LABEL: @__asan_detect_use_after_return_always =
-; ALWAYS-SAME: weak_odr constant i32 1
-
 declare void @Foo(i8*)
 
 define void @Empty() uwtable sanitize_address {