diff --git a/rusty/benchmark-demo/Cargo.toml b/rusty/benchmark-demo/Cargo.toml
index f29945b..6fdb9ea 100644
--- a/rusty/benchmark-demo/Cargo.toml
+++ b/rusty/benchmark-demo/Cargo.toml
@@ -15,3 +15,7 @@ pprof = { version = "0.11.1", features = ["flamegraph", "criterion"] }
 [[bench]]
 name = "bench0"
 harness = false
+
+[[bench]]
+name = "bench-fault"
+harness = false
diff --git a/rusty/benchmark-demo/benches/bench-fault.rs b/rusty/benchmark-demo/benches/bench-fault.rs
new file mode 100644
index 0000000..4ba9ec8
--- /dev/null
+++ b/rusty/benchmark-demo/benches/bench-fault.rs
@@ -0,0 +1,21 @@
+use criterion::{black_box, criterion_group, criterion_main, BenchmarkId, Criterion};
+use pprof::criterion::{Output, PProfProfiler};
+
+fn format_macro(v: i32) -> String {
+    format!("{}", v)
+}
+
+fn bench_format_macro(c: &mut Criterion) {
+    let a = 1;
+    c.bench_function("bench_format_macro", |b| {
+        b.iter(|| format_macro(black_box(a.clone())))
+    });
+}
+
+criterion_group! {
+    name = bench_fault;
+    config = Criterion::default().with_profiler(PProfProfiler::new(100, Output::Flamegraph(None)));
+    targets = bench_format_macro,
+}
+
+criterion_main!(bench_fault);