detect fragmentation when fuzzing

evanrichter · evanrichter · commit 68bc1af94f8e · 2022-11-08T21:20:46.000-06:00
diff --git a/fuzz/fuzz_targets/chaos.rs b/fuzz/fuzz_targets/chaos.rs
@@ -117,4 +117,8 @@ fn fuzz(size: u16, actions: Vec<Action>) {
             heap.deallocate(ptr, layout);
         }
     }
+
+    // make sure we can allocate the full heap (no fragmentation)
+    let full = Layout::from_size_align(heap.size(), 1).unwrap();
+    assert!(heap.allocate_first_fit(full).is_ok());
 }

Original file line number	Diff line number	Diff line change
`@@ -117,4 +117,8 @@ fn fuzz(size: u16, actions: Vec<Action>) {`
`117`	`117`	`heap.deallocate(ptr, layout);`
`118`	`118`	`}`
`119`	`119`	`}`
	`120`	`+`
	`121`	`+ // make sure we can allocate the full heap (no fragmentation)`
	`122`	`+ let full = Layout::from_size_align(heap.size(), 1).unwrap();`
	`123`	`+ assert!(heap.allocate_first_fit(full).is_ok());`
`120`	`124`	`}`