try not using svm on intel

Author: majosm

arraycontext/impl/pytato/__init__.py

@@ -379,8 +379,20 @@ def __init__(
         self.using_svm = None
 
         if allocator is None:
+            import pyopencl as cl
             from pyopencl.characterize import has_coarse_grain_buffer_svm
             has_svm = has_coarse_grain_buffer_svm(queue.device)
+
+            dev = queue.device
+            if (has_svm
+                    and dev.type & cl.device_type.CPU
+                    and "intel" in dev.platform.name.lower()):
+                # The Intel CPU OpenCL runtime advertises coarse-grain buffer
+                # SVM, but its clEnqueueSVMFree corrupts the host heap ("double
+                # free or corruption"), aborting the process. Fall back to
+                # buffer allocation there.
+                has_svm = False
+
             if has_svm:
                 self.using_svm = True