branch-4.0: [fix](ut) Fix SegmentCorruptionTest ASAN heap-buffer-overflow #58456 (#58498)

Cherry-picked from #58456

Co-authored-by: zzzxl <[email protected]>

Author: github-actions[bot]

be/test/olap/rowset/segment_v2/segment_corruption_test.cpp

@@ -83,8 +83,12 @@ class SegmentCorruptionTest : public testing::Test {
         // background threads from accessing SyncPoint during/after destruction
         SyncPoint::get_instance()->disable_processing();
 
-        if (ExecEnv::GetInstance()->file_cache_factory() != nullptr) {
-            io::FileCacheFactory::instance()->clear_file_caches(true);
+        auto* factory = io::FileCacheFactory::instance();
+        if (factory != nullptr) {
+            factory->clear_file_caches(true);
+
+            factory->_caches.clear();
+            factory->_path_to_cache.clear();
         }
 
         // Give background threads time to stop after cache destruction
@@ -132,8 +136,12 @@ class SegmentCorruptionTest : public testing::Test {
         // background threads from accessing SyncPoint during/after destruction
         SyncPoint::get_instance()->disable_processing();
 
-        if (ExecEnv::GetInstance()->file_cache_factory() != nullptr) {
-            io::FileCacheFactory::instance()->clear_file_caches(true);
+        auto* factory = io::FileCacheFactory::instance();
+        if (factory != nullptr) {
+            factory->clear_file_caches(true);
+
+            factory->_caches.clear();
+            factory->_path_to_cache.clear();
         }
 
         // Give background threads time to stop after cache destruction