Index: lib/Target/AMDGPU/AMDGPUSubtarget.cpp
===================================================================
--- lib/Target/AMDGPU/AMDGPUSubtarget.cpp
+++ lib/Target/AMDGPU/AMDGPUSubtarget.cpp
@@ -260,9 +260,7 @@
   Policy.OnlyTopDown = false;
   Policy.OnlyBottomUp = false;
 
-  // Enabling ShouldTrackLaneMasks crashes the SI Machine Scheduler.
-  if (!enableSIScheduler())
-    Policy.ShouldTrackLaneMasks = true;
+  Policy.ShouldTrackLaneMasks = true;
 }
 
 bool SISubtarget::isVGPRSpillingEnabled(const Function& F) const {
Index: lib/Target/AMDGPU/SIMachineScheduler.h
===================================================================
--- lib/Target/AMDGPU/SIMachineScheduler.h
+++ lib/Target/AMDGPU/SIMachineScheduler.h
@@ -440,7 +440,7 @@
 
   // To init Block's RPTracker.
   void initRPTracker(RegPressureTracker &RPTracker) {
-    RPTracker.init(&MF, RegClassInfo, LIS, BB, RegionBegin, false, false);
+    RPTracker.init(&MF, RegClassInfo, LIS, BB, RegionBegin, true, false);
   }
 
   MachineBasicBlock *getBB() { return BB; }