Fixed crashes in variable time step integrators

platforms/cuda/src/CudaKernels.cpp

@@ -4329,7 +4329,7 @@ double CudaIntegrateVariableLangevinStepKernel::execute(ContextImpl& context, co
             useDouble ? (void*) &kT : (void*) &kTFloat,
             &cu.getIntegrationUtilities().getStepSize().getDevicePointer(),
             &cu.getVelm().getDevicePointer(), &cu.getForce().getDevicePointer(), &params->getDevicePointer()};
-    int sharedSize = blockSize*(useDouble ? sizeof(double) : sizeof(float));
+    int sharedSize = 2*blockSize*(useDouble ? sizeof(double) : sizeof(float));
     cu.executeKernel(selectSizeKernel, argsSelect, blockSize, blockSize, sharedSize);
 
     // Call the first integration kernel.

platforms/opencl/src/OpenCLKernels.cpp

@@ -4466,7 +4466,8 @@ double OpenCLIntegrateVariableVerletStepKernel::execute(ContextImpl& context, co
         selectSizeKernel.setArg<cl::Buffer>(3, cl.getIntegrationUtilities().getStepSize().getDeviceBuffer());
         selectSizeKernel.setArg<cl::Buffer>(4, cl.getVelm().getDeviceBuffer());
         selectSizeKernel.setArg<cl::Buffer>(5, cl.getForce().getDeviceBuffer());
-        selectSizeKernel.setArg(6, blockSize*sizeof(cl_float), NULL);
+        int elementSize = (useDouble ? sizeof(cl_double) : sizeof(cl_float));
+        selectSizeKernel.setArg(6, blockSize*elementSize, NULL);
     }
 
     // Select the step size to use.
@@ -4572,8 +4573,9 @@ double OpenCLIntegrateVariableLangevinStepKernel::execute(ContextImpl& context,
         selectSizeKernel.setArg<cl::Buffer>(5, cl.getVelm().getDeviceBuffer());
         selectSizeKernel.setArg<cl::Buffer>(6, cl.getForce().getDeviceBuffer());
         selectSizeKernel.setArg<cl::Buffer>(7, params->getDeviceBuffer());
-        selectSizeKernel.setArg(8, params->getSize()*sizeof(cl_float), NULL);
-        selectSizeKernel.setArg(9, blockSize*sizeof(cl_float), NULL);
+	int elementSize = (useDouble ? sizeof(cl_double) : sizeof(cl_float));
+        selectSizeKernel.setArg(8, params->getSize()*elementSize, NULL);
+        selectSizeKernel.setArg(9, blockSize*elementSize, NULL);
     }
 
     // Select the step size to use.