diff --git "a/ntoskrnl/mm/section.c" "b/ntoskrnl/mm/section.c"
index 6e5d85013e4..f0e58f48df3 100644
--- "a/ntoskrnl/mm/section.c"
+++ "b/ntoskrnl/mm/section.c"
@@ -4331,8 +4331,11 @@ MmCanFileBeTruncated(
     }
 
     MmLockSectionSegment(Segment);
-    if ((Segment->SectionCount == 0) ||
-        ((Segment->SectionCount == 1) && (SectionObjectPointer->SharedCacheMap != NULL)))
+    /* Below two lines are from 15-1792-gc0bf352 which was BAD. See CORE-19789
+     * It was supposedly to "Fix regression of MmCanFileBeTruncated". */
+//    if ((Segment->SectionCount == 0) ||
+//        ((Segment->SectionCount == 1) && (SectionObjectPointer->SharedCacheMap != NULL)))
+    if ((Segment->SectionCount == 1) && (SectionObjectPointer->SharedCacheMap != NULL))
     {
         /* If the cache is the only one holding a reference to the segment, then it's fine to resize */
         Ret = TRUE;