diff --git a/Cargo.toml b/Cargo.toml
index ff7fe5d..23ce984 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "chaindev"
-version = "0.42.1"
+version = "0.42.2"
 edition = "2021"
 authors = ["hui.fan@mail.ru"]
 description = "Powerful development and testing utils for blockchain developers."
diff --git a/src/beacon_based/ddev/mod.rs b/src/beacon_based/ddev/mod.rs
index b3ef61e..2c23734 100644
--- a/src/beacon_based/ddev/mod.rs
+++ b/src/beacon_based/ddev/mod.rs
@@ -160,6 +160,9 @@ where
                 env.show();
             }),
             Op::ShowAll => Env::<C, P, S>::show_all().c(d!()),
+            Op::DebugFailedNodes => Env::<C, P, S>::load_env_by_cfg(self)
+                .c(d!())
+                .and_then(|env| env.debug_failed_nodes().c(d!())),
             Op::List => Env::<C, P, S>::list_all().c(d!()),
             Op::HostPutFile {
                 local_path,
@@ -1047,6 +1050,59 @@ where
         Ok(())
     }
 
+    fn debug_failed_nodes(&self) -> Result<()> {
+        let mut failed_cases = vec![];
+        let mut errlist: Vec<Box<dyn RucError>> = vec![];
+
+        for nodes in self
+            .meta
+            .nodes
+            .values()
+            .chain(self.meta.fuhrers.values())
+            .collect::<Vec<_>>()
+            .chunks(24)
+        {
+            thread::scope(|s| {
+                nodes
+                    .iter()
+                    .map(|n| {
+                        let cmd =
+                            self.node_cmdline_generator.cmd_cnt_running(n, &self.meta);
+                        s.spawn(move || {
+                            let process_cnt = Remote::from(&n.host)
+                                .exec_cmd(&cmd)
+                                .c(d!())?
+                                .trim()
+                                .parse::<u64>()
+                                .c(d!())?;
+                            if 3 > process_cnt {
+                                Ok((n, true)) // failed status
+                            } else {
+                                Ok((n, false)) // well status
+                            }
+                        })
+                    })
+                    .collect::<Vec<_>>()
+                    .into_iter()
+                    .flat_map(|hdr| hdr.join())
+                    .for_each(|ret| match ret {
+                        Ok((n, failed)) => {
+                            if failed {
+                                failed_cases.push((n.id, n.host.host_id()));
+                            }
+                        }
+                        Err(e) => {
+                            errlist.push(e);
+                        }
+                    });
+            })
+        }
+
+        println!("{}", serde_json::to_string_pretty(&failed_cases).c(d!())?);
+
+        check_errlist!(errlist)
+    }
+
     // List the names of all existing ENVs
     fn list_all() -> Result<()> {
         let list = Self::get_env_list().c(d!())?;
@@ -1680,6 +1736,7 @@ where
     StopAll(bool /*force or not*/),
     Show,
     ShowAll,
+    DebugFailedNodes,
     List,
     HostPutFile {
         local_path: String,
diff --git a/src/beacon_based/dev.rs b/src/beacon_based/dev.rs
index 3cec0b8..4859b4d 100644
--- a/src/beacon_based/dev.rs
+++ b/src/beacon_based/dev.rs
@@ -160,6 +160,9 @@ where
                     })
             }
             Op::ShowAll => Env::<Data, Ports, Cmds>::show_all().c(d!()),
+            Op::DebugFailedNodes => Env::<Data, Ports, Cmds>::load_env_by_cfg(self)
+                .c(d!())
+                .and_then(|env| env.debug_failed_nodes().c(d!())),
             Op::List => Env::<Data, Ports, Cmds>::list_all().c(d!()),
             Op::Custom(custom_op) => custom_op.exec(&self.name).c(d!()),
             Op::Nil(_) => unreachable!(),
@@ -595,6 +598,26 @@ where
         Ok(())
     }
 
+    fn debug_failed_nodes(&self) -> Result<()> {
+        let mut failed_cases = vec![];
+
+        for n in self.meta.nodes.values().chain(self.meta.fuhrers.values()) {
+            let cmd = self.node_cmdline_generator.cmd_cnt_running(n, &self.meta);
+            let process_cnt = cmd::exec_output(&cmd)
+                .c(d!(&cmd))?
+                .trim()
+                .parse::<u64>()
+                .c(d!())?;
+            if 3 > process_cnt {
+                failed_cases.push(n.id);
+            }
+        }
+
+        serde_json::to_string_pretty(&failed_cases)
+            .c(d!())
+            .map(|s| println!("{s}"))
+    }
+
     // list the names of all existing ENVs
     fn list_all() -> Result<()> {
         let list = Self::get_env_list().c(d!())?;
@@ -1029,6 +1052,7 @@ where
     StopAll(bool /*force or not*/),
     Show,
     ShowAll,
+    DebugFailedNodes,
     List,
     Custom(Ops),
     Nil(Ports),