[backport] Clear CUDA error before pointer check (dmlc#11386) (dmlc#11577)

trivialfis · apmorton · web-flow · commit 04988b1a283f · 2025-07-23T19:33:33.000+08:00
Co-authored-by: Austin Morton &lt;apmorton@users.noreply.github.com&gt;
diff --git a/src/data/array_interface.cu b/src/data/array_interface.cu
@@ -38,6 +38,8 @@ bool ArrayInterfaceHandler::IsCudaPtr(void const* ptr) {
   if (!ptr) {
     return false;
   }
+  // clear potentially pre-existing/unrelated error
+  cudaGetLastError();
   cudaPointerAttributes attr;
   auto err = cudaPointerGetAttributes(&attr, ptr);
   // reset error

Original file line number	Diff line number	Diff line change
`@@ -38,6 +38,8 @@ bool ArrayInterfaceHandler::IsCudaPtr(void const* ptr) {`
`38`	`38`	`if (!ptr) {`
`39`	`39`	`return false;`
`40`	`40`	`}`
	`41`	`+ // clear potentially pre-existing/unrelated error`
	`42`	`+ cudaGetLastError();`
`41`	`43`	`cudaPointerAttributes attr;`
`42`	`44`	`auto err = cudaPointerGetAttributes(&attr, ptr);`
`43`	`45`	`// reset error`