diff --git a/compiler/dex/quick/arm64/int_arm64.cc b/compiler/dex/quick/arm64/int_arm64.cc
index 418d81e..b8f31a2 100644
--- a/compiler/dex/quick/arm64/int_arm64.cc
+++ b/compiler/dex/quick/arm64/int_arm64.cc
@@ -478,7 +478,6 @@
       } else {
         reconstructed_imm = base + 1;
       }
-      DCHECK_EQ(reconstructed_imm, magic_table[lit].magic64) << " for literal " << lit;
     }
 
     // Load the magic constant in two instructions.
diff --git a/compiler/dex/quick/arm64/utility_arm64.cc b/compiler/dex/quick/arm64/utility_arm64.cc
index 6985b73..3314c12 100644
--- a/compiler/dex/quick/arm64/utility_arm64.cc
+++ b/compiler/dex/quick/arm64/utility_arm64.cc
@@ -345,7 +345,7 @@
   case Instruction::SUB_INT_2ADDR:
     // The code below is consistent with the implementation of OpRegRegImm().
     {
-      int32_t abs_value = std::abs(value);
+      uint32_t abs_value = (value == INT_MIN) ? value : std::abs(value);
       if (abs_value < 0x1000) {
         return true;
       } else if ((abs_value & UINT64_C(0xfff)) == 0 && ((abs_value >> 12) < 0x1000)) {
@@ -805,7 +805,7 @@
 LIR* Arm64Mir2Lir::OpRegRegImm64(OpKind op, RegStorage r_dest, RegStorage r_src1, int64_t value) {
   LIR* res;
   bool neg = (value < 0);
-  int64_t abs_value = (neg) ? -value : value;
+  uint64_t abs_value = (neg & !(value == LLONG_MIN)) ? -value : value;
   A64Opcode opcode = kA64Brk1d;
   A64Opcode alt_opcode = kA64Brk1d;
   bool is_logical = false;
@@ -938,7 +938,7 @@
   A64Opcode neg_opcode = kA64Brk1d;
   bool shift;
   bool neg = (value < 0);
-  uint64_t abs_value = (neg) ? -value : value;
+  uint64_t abs_value = (neg & !(value == LLONG_MIN)) ? -value : value;
 
   if (LIKELY(abs_value < 0x1000)) {
     // abs_value is a 12-bit immediate.
diff --git a/runtime/jni_internal.cc b/runtime/jni_internal.cc
index ad06b85..ba38b65 100644
--- a/runtime/jni_internal.cc
+++ b/runtime/jni_internal.cc
@@ -45,6 +45,7 @@
 #include "mirror/object_array-inl.h"
 #include "mirror/string-inl.h"
 #include "mirror/throwable.h"
+#include "nativebridge/native_bridge.h"
 #include "parsed_options.h"
 #include "reflection.h"
 #include "runtime.h"
diff --git a/runtime/monitor.cc b/runtime/monitor.cc
index 5020ced..8c5b92f 100644
--- a/runtime/monitor.cc
+++ b/runtime/monitor.cc
@@ -36,6 +36,8 @@
 
 namespace art {
 
+static constexpr uint64_t kLongWaitMs = 100;
+
 /*
  * Every Object has a monitor associated with it, but not every Object is actually locked.  Even
  * the ones that are locked do not need a full-fledged monitor until a) there is actual contention
@@ -242,6 +244,7 @@
     mirror::ArtMethod* owners_method = locking_method_;
     uint32_t owners_dex_pc = locking_dex_pc_;
     // Do this before releasing the lock so that we don't get deflated.
+    size_t num_waiters = num_waiters_;
     ++num_waiters_;
     monitor_lock_.Unlock(self);  // Let go of locks in order.
     self->SetMonitorEnterObject(GetObject());
@@ -263,6 +266,12 @@
             const char* owners_filename;
             uint32_t owners_line_number;
             TranslateLocation(owners_method, owners_dex_pc, &owners_filename, &owners_line_number);
+            if (wait_ms > kLongWaitMs && owners_method != nullptr) {
+              LOG(WARNING) << "Long monitor contention event with owner method="
+                  << PrettyMethod(owners_method) << " from " << owners_filename << ":"
+                  << owners_line_number << " waiters=" << num_waiters << " for "
+                  << PrettyDuration(MsToNs(wait_ms));
+            }
             LogContentionEvent(self, wait_ms, sample_percent, owners_filename, owners_line_number);
           }
         }
diff --git a/test/083-compiler-regressions/expected.txt b/test/083-compiler-regressions/expected.txt
index c43d1f7..51bf847 100644
--- a/test/083-compiler-regressions/expected.txt
+++ b/test/083-compiler-regressions/expected.txt
@@ -1,3 +1,4 @@
+b17630605 passes
 b17411468 passes
 b2296099 passes
 b2302318 passes
diff --git a/test/083-compiler-regressions/src/Main.java b/test/083-compiler-regressions/src/Main.java
index 9c772b9..9ad8ea7 100644
--- a/test/083-compiler-regressions/src/Main.java
+++ b/test/083-compiler-regressions/src/Main.java
@@ -30,6 +30,7 @@
     }
 
     public static void main(String args[]) throws Exception {
+        b17630605();
         b17411468();
         b2296099Test();
         b2302318Test();
@@ -63,6 +64,18 @@
         minDoubleWith3ConstsTest();
     }
 
+    public static void b17630605() {
+      // b/17630605 - failure to properly handle min long immediates.
+      long a1 = 40455547223404749L;
+      long a2 = Long.MIN_VALUE;
+      long answer = a1 + a2;
+      if (answer == -9182916489631371059L) {
+          System.out.println("b17630605 passes");
+      } else {
+          System.out.println("b17630605 fails: " + answer);
+      }
+    }
+
     public static void b17411468() {
       // b/17411468 - inline Math.round failure.
       double d1 = 1.0;