We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
[BUG]: colossalai run failed with unknown reason
### 🐛 Describe the bug

Some users have reported that they encounter launch failure when using `colossalai run`, but there is no error message to tell exactly what went wrong. A sample output is given below.

```text
Error: failed to run torchrun --nproc_per_node=4 --nnodes=1 --node_rank=0 --rdzv_backend=c10d --rdzv_endpoint=127.0.0.1:29500 --rdzv_id=colossalai-default-job train.py --config config.py -s on 127.0.0.1
```

### Environment

_No response_

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `colossalai/cli/launcher/multinode_runner.py`
Content:
```
1 import fabric
2 from .hostinfo import HostInfo, HostInfoList
3 from multiprocessing import Pipe, Process
4 from multiprocessing import connection as mp_connection
5 import click
6 
7 
8 def run_on_host(hostinfo: HostInfo, workdir: str, recv_conn: mp_connection.Connection,
9                 send_conn: mp_connection.Connection, env: dict) -> None:
10     """
11     Use fabric connection to execute command on local or remote hosts.
12 
13     Args:
14         hostinfo (HostInfo): host information
15         workdir (str): the directory to execute the command
16         recv_conn (multiprocessing.connection.Connection): receive messages from the master sender
17         send_conn (multiprocessing.connection.Connection): send messages to the master receiver
18         env (dict): a dictionary for environment variables
19     """
20 
21     fab_conn = fabric.Connection(hostinfo.hostname, port=hostinfo.port)
22     finish = False
23     env_msg = ' '.join([f'{k}=\"{v}\"' for k, v in env.items()])
24 
25     # keep listening until exit
26     while not finish:
27         # receive cmd
28         cmds = recv_conn.recv()
29 
30         if cmds == 'exit':
31             # exit from the loop
32             finish = True
33             break
34         else:
35             # execute the commands
36             try:
37                 # cd to execute directory
38                 with fab_conn.cd(workdir):
39                     # propagate the runtime environment
40                     with fab_conn.prefix(f"export {env_msg}"):
41                         if hostinfo.is_local_host:
42                             # execute on the local machine
43                             fab_conn.local(cmds, hide=False)
44                         else:
45                             # execute on the remote machine
46                             fab_conn.run(cmds, hide=False)
47                     send_conn.send('success')
48             except:
49                 click.echo(f"Error: failed to run {cmds} on {hostinfo.hostname}")
50                 send_conn.send('failure')
51 
52     # shutdown
53     send_conn.send("finish")
54     fab_conn.close()
55 
56 
57 class MultiNodeRunner:
58     """
59     A runner to execute commands on an array of machines. This runner
60     is inspired by Nezha (https://github.com/zhuzilin/NeZha).
61     """
62 
63     def __init__(self):
64         self.processes = {}
65         self.master_send_conns = {}
66         self.master_recv_conns = {}
67 
68     def connect(self, host_info_list: HostInfoList, workdir: str, env: dict) -> None:
69         """
70         Establish connections to a list of hosts
71 
72         Args:
73             host_info_list (HostInfoList): a list of HostInfo objects
74             workdir (str): the directory where command is executed
75             env (dict): environment variables to propagate to hosts
76         """
77         for hostinfo in host_info_list:
78             master_send_conn, worker_recv_conn = Pipe()
79             master_recv_conn, worker_send_conn = Pipe()
80             p = Process(target=run_on_host, args=(hostinfo, workdir, worker_recv_conn, worker_send_conn, env))
81             p.start()
82             self.processes[hostinfo.hostname] = p
83             self.master_recv_conns[hostinfo.hostname] = master_recv_conn
84             self.master_send_conns[hostinfo.hostname] = master_send_conn
85 
86     def send(self, hostinfo: HostInfo, cmd: str) -> None:
87         """
88         Send a command to a local/remote host.
89 
90         Args:
91             hostinfo (HostInfo): host information
92             cmd (str): the command to execute
93         """
94 
95         assert hostinfo.hostname in self.master_send_conns, \
96             f'{hostinfo} is not found in the current connections'
97         conn = self.master_send_conns[hostinfo.hostname]
98         conn.send(cmd)
99 
100     def stop_all(self) -> None:
101         """
102         Stop connections to all hosts.
103         """
104 
105         for hostname, conn in self.master_send_conns.items():
106             conn.send('exit')
107 
108     def recv_from_all(self) -> dict:
109         """
110         Receive messages from all hosts
111 
112         Returns:
113             msg_from_node (dict): a dictionry which contains messages from each node
114         """
115 
116         msg_from_node = dict()
117         for hostname, conn in self.master_recv_conns.items():
118             msg_from_node[hostname] = conn.recv()
119         return msg_from_node
120
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/colossalai/cli/launcher/multinode_runner.py b/colossalai/cli/launcher/multinode_runner.py
--- a/colossalai/cli/launcher/multinode_runner.py
+++ b/colossalai/cli/launcher/multinode_runner.py
@@ -1,8 +1,10 @@
-import fabric
-from .hostinfo import HostInfo, HostInfoList
 from multiprocessing import Pipe, Process
 from multiprocessing import connection as mp_connection
+
 import click
+import fabric
+
+from .hostinfo import HostInfo, HostInfoList
 
 
 def run_on_host(hostinfo: HostInfo, workdir: str, recv_conn: mp_connection.Connection,
@@ -45,8 +47,10 @@
                             # execute on the remote machine
                             fab_conn.run(cmds, hide=False)
                     send_conn.send('success')
-            except:
-                click.echo(f"Error: failed to run {cmds} on {hostinfo.hostname}")
+            except Exception as e:
+                click.echo(
+                    f"Error: failed to run {cmds} on {hostinfo.hostname}, is localhost: {hostinfo.is_local_host}, exception: {e}"
+                )
                 send_conn.send('failure')
 
     # shutdown

{"golden_diff": "diff --git a/colossalai/cli/launcher/multinode_runner.py b/colossalai/cli/launcher/multinode_runner.py\n--- a/colossalai/cli/launcher/multinode_runner.py\n+++ b/colossalai/cli/launcher/multinode_runner.py\n@@ -1,8 +1,10 @@\n-import fabric\n-from .hostinfo import HostInfo, HostInfoList\n from multiprocessing import Pipe, Process\n from multiprocessing import connection as mp_connection\n+\n import click\n+import fabric\n+\n+from .hostinfo import HostInfo, HostInfoList\n \n \n def run_on_host(hostinfo: HostInfo, workdir: str, recv_conn: mp_connection.Connection,\n@@ -45,8 +47,10 @@\n                             # execute on the remote machine\n                             fab_conn.run(cmds, hide=False)\n                     send_conn.send('success')\n-            except:\n-                click.echo(f\"Error: failed to run {cmds} on {hostinfo.hostname}\")\n+            except Exception as e:\n+                click.echo(\n+                    f\"Error: failed to run {cmds} on {hostinfo.hostname}, is localhost: {hostinfo.is_local_host}, exception: {e}\"\n+                )\n                 send_conn.send('failure')\n \n     # shutdown\n", "issue": "[BUG]: colossalai run failed with unknown reason\n### \ud83d\udc1b Describe the bug\n\nSome users have reported that they encounter launch failure when using `colossalai run`, but there is no error message to tell exactly what went wrong. A sample output is given below.\r\n\r\n```text\r\nError: failed to run torchrun --nproc_per_node=4 --nnodes=1 --node_rank=0 --rdzv_backend=c10d --rdzv_endpoint=127.0.0.1:29500 --rdzv_id=colossalai-default-job train.py --config config.py -s on 127.0.0.1\r\n```\n\n### Environment\n\n_No response_\n", "before_files": [{"content": "import fabric\nfrom .hostinfo import HostInfo, HostInfoList\nfrom multiprocessing import Pipe, Process\nfrom multiprocessing import connection as mp_connection\nimport click\n\n\ndef run_on_host(hostinfo: HostInfo, workdir: str, recv_conn: mp_connection.Connection,\n                send_conn: mp_connection.Connection, env: dict) -> None:\n    \"\"\"\n    Use fabric connection to execute command on local or remote hosts.\n\n    Args:\n        hostinfo (HostInfo): host information\n        workdir (str): the directory to execute the command\n        recv_conn (multiprocessing.connection.Connection): receive messages from the master sender\n        send_conn (multiprocessing.connection.Connection): send messages to the master receiver\n        env (dict): a dictionary for environment variables\n    \"\"\"\n\n    fab_conn = fabric.Connection(hostinfo.hostname, port=hostinfo.port)\n    finish = False\n    env_msg = ' '.join([f'{k}=\\\"{v}\\\"' for k, v in env.items()])\n\n    # keep listening until exit\n    while not finish:\n        # receive cmd\n        cmds = recv_conn.recv()\n\n        if cmds == 'exit':\n            # exit from the loop\n            finish = True\n            break\n        else:\n            # execute the commands\n            try:\n                # cd to execute directory\n                with fab_conn.cd(workdir):\n                    # propagate the runtime environment\n                    with fab_conn.prefix(f\"export {env_msg}\"):\n                        if hostinfo.is_local_host:\n                            # execute on the local machine\n                            fab_conn.local(cmds, hide=False)\n                        else:\n                            # execute on the remote machine\n                            fab_conn.run(cmds, hide=False)\n                    send_conn.send('success')\n            except:\n                click.echo(f\"Error: failed to run {cmds} on {hostinfo.hostname}\")\n                send_conn.send('failure')\n\n    # shutdown\n    send_conn.send(\"finish\")\n    fab_conn.close()\n\n\nclass MultiNodeRunner:\n    \"\"\"\n    A runner to execute commands on an array of machines. This runner\n    is inspired by Nezha (https://github.com/zhuzilin/NeZha).\n    \"\"\"\n\n    def __init__(self):\n        self.processes = {}\n        self.master_send_conns = {}\n        self.master_recv_conns = {}\n\n    def connect(self, host_info_list: HostInfoList, workdir: str, env: dict) -> None:\n        \"\"\"\n        Establish connections to a list of hosts\n\n        Args:\n            host_info_list (HostInfoList): a list of HostInfo objects\n            workdir (str): the directory where command is executed\n            env (dict): environment variables to propagate to hosts\n        \"\"\"\n        for hostinfo in host_info_list:\n            master_send_conn, worker_recv_conn = Pipe()\n            master_recv_conn, worker_send_conn = Pipe()\n            p = Process(target=run_on_host, args=(hostinfo, workdir, worker_recv_conn, worker_send_conn, env))\n            p.start()\n            self.processes[hostinfo.hostname] = p\n            self.master_recv_conns[hostinfo.hostname] = master_recv_conn\n            self.master_send_conns[hostinfo.hostname] = master_send_conn\n\n    def send(self, hostinfo: HostInfo, cmd: str) -> None:\n        \"\"\"\n        Send a command to a local/remote host.\n\n        Args:\n            hostinfo (HostInfo): host information\n            cmd (str): the command to execute\n        \"\"\"\n\n        assert hostinfo.hostname in self.master_send_conns, \\\n            f'{hostinfo} is not found in the current connections'\n        conn = self.master_send_conns[hostinfo.hostname]\n        conn.send(cmd)\n\n    def stop_all(self) -> None:\n        \"\"\"\n        Stop connections to all hosts.\n        \"\"\"\n\n        for hostname, conn in self.master_send_conns.items():\n            conn.send('exit')\n\n    def recv_from_all(self) -> dict:\n        \"\"\"\n        Receive messages from all hosts\n\n        Returns:\n            msg_from_node (dict): a dictionry which contains messages from each node\n        \"\"\"\n\n        msg_from_node = dict()\n        for hostname, conn in self.master_recv_conns.items():\n            msg_from_node[hostname] = conn.recv()\n        return msg_from_node\n", "path": "colossalai/cli/launcher/multinode_runner.py"}], "after_files": [{"content": "from multiprocessing import Pipe, Process\nfrom multiprocessing import connection as mp_connection\n\nimport click\nimport fabric\n\nfrom .hostinfo import HostInfo, HostInfoList\n\n\ndef run_on_host(hostinfo: HostInfo, workdir: str, recv_conn: mp_connection.Connection,\n                send_conn: mp_connection.Connection, env: dict) -> None:\n    \"\"\"\n    Use fabric connection to execute command on local or remote hosts.\n\n    Args:\n        hostinfo (HostInfo): host information\n        workdir (str): the directory to execute the command\n        recv_conn (multiprocessing.connection.Connection): receive messages from the master sender\n        send_conn (multiprocessing.connection.Connection): send messages to the master receiver\n        env (dict): a dictionary for environment variables\n    \"\"\"\n\n    fab_conn = fabric.Connection(hostinfo.hostname, port=hostinfo.port)\n    finish = False\n    env_msg = ' '.join([f'{k}=\\\"{v}\\\"' for k, v in env.items()])\n\n    # keep listening until exit\n    while not finish:\n        # receive cmd\n        cmds = recv_conn.recv()\n\n        if cmds == 'exit':\n            # exit from the loop\n            finish = True\n            break\n        else:\n            # execute the commands\n            try:\n                # cd to execute directory\n                with fab_conn.cd(workdir):\n                    # propagate the runtime environment\n                    with fab_conn.prefix(f\"export {env_msg}\"):\n                        if hostinfo.is_local_host:\n                            # execute on the local machine\n                            fab_conn.local(cmds, hide=False)\n                        else:\n                            # execute on the remote machine\n                            fab_conn.run(cmds, hide=False)\n                    send_conn.send('success')\n            except Exception as e:\n                click.echo(\n                    f\"Error: failed to run {cmds} on {hostinfo.hostname}, is localhost: {hostinfo.is_local_host}, exception: {e}\"\n                )\n                send_conn.send('failure')\n\n    # shutdown\n    send_conn.send(\"finish\")\n    fab_conn.close()\n\n\nclass MultiNodeRunner:\n    \"\"\"\n    A runner to execute commands on an array of machines. This runner\n    is inspired by Nezha (https://github.com/zhuzilin/NeZha).\n    \"\"\"\n\n    def __init__(self):\n        self.processes = {}\n        self.master_send_conns = {}\n        self.master_recv_conns = {}\n\n    def connect(self, host_info_list: HostInfoList, workdir: str, env: dict) -> None:\n        \"\"\"\n        Establish connections to a list of hosts\n\n        Args:\n            host_info_list (HostInfoList): a list of HostInfo objects\n            workdir (str): the directory where command is executed\n            env (dict): environment variables to propagate to hosts\n        \"\"\"\n        for hostinfo in host_info_list:\n            master_send_conn, worker_recv_conn = Pipe()\n            master_recv_conn, worker_send_conn = Pipe()\n            p = Process(target=run_on_host, args=(hostinfo, workdir, worker_recv_conn, worker_send_conn, env))\n            p.start()\n            self.processes[hostinfo.hostname] = p\n            self.master_recv_conns[hostinfo.hostname] = master_recv_conn\n            self.master_send_conns[hostinfo.hostname] = master_send_conn\n\n    def send(self, hostinfo: HostInfo, cmd: str) -> None:\n        \"\"\"\n        Send a command to a local/remote host.\n\n        Args:\n            hostinfo (HostInfo): host information\n            cmd (str): the command to execute\n        \"\"\"\n\n        assert hostinfo.hostname in self.master_send_conns, \\\n            f'{hostinfo} is not found in the current connections'\n        conn = self.master_send_conns[hostinfo.hostname]\n        conn.send(cmd)\n\n    def stop_all(self) -> None:\n        \"\"\"\n        Stop connections to all hosts.\n        \"\"\"\n\n        for hostname, conn in self.master_send_conns.items():\n            conn.send('exit')\n\n    def recv_from_all(self) -> dict:\n        \"\"\"\n        Receive messages from all hosts\n\n        Returns:\n            msg_from_node (dict): a dictionry which contains messages from each node\n        \"\"\"\n\n        msg_from_node = dict()\n        for hostname, conn in self.master_recv_conns.items():\n            msg_from_node[hostname] = conn.recv()\n        return msg_from_node\n", "path": "colossalai/cli/launcher/multinode_runner.py"}]}