[UR][L0] Fixed issue where L0 Adapters unused were not calling teardown (#20642)

- L0 Static Loader "requires" teardown to be called before the adapter
library exits otherwise the loader may call into the adapter during
teardown to an invalid address. The "skipping" of L0 adapters failed to
call the L0 teardown api required, which results in sporadic calls to
invalid memory during teardown.
- Added a function such that when an adapter is skipped, then the
adapter calls the Loader teardown given static loader compile.

Signed-off-by: Neil R. Spruit <[email protected]>

Author: nrspruit

unified-runtime/source/adapters/level_zero/adapter.cpp

@@ -288,6 +288,14 @@ static bool isBMGorNewer() {
   return urResult == UR_RESULT_SUCCESS;
 }
 
+static void releaseStaticLoaderResourcesIfNeeded() {
+#ifdef UR_STATIC_LEVEL_ZERO
+  // Given static linking of the L0 Loader, we must release the static loader
+  // resources if the adapter is not used.
+  zelLoaderContextTeardown();
+#endif
+}
+
 // returns a pair indicating whether to use the V1 adapter and a string
 // indicating the reason for the decision.
 static std::pair<bool, std::string> shouldUseV1Adapter() {
@@ -525,12 +533,14 @@ ur_adapter_handle_t_::ur_adapter_handle_t_()
     auto [useV2, reason] = shouldUseV2Adapter();
     if (!useV2) {
       UR_LOG(INFO, "Skipping L0 V2 adapter: {}", reason);
+      releaseStaticLoaderResourcesIfNeeded();
       return;
     }
 #else
     auto [useV1, reason] = shouldUseV1Adapter();
     if (!useV1) {
       UR_LOG(INFO, "Skipping L0 V1 adapter: {}", reason);
+      releaseStaticLoaderResourcesIfNeeded();
       return;
     }
 #endif