[lldb-dap] Fix URL label and error code in DAPError #145010
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@llvm/pr-subscribers-lldb Author: None (DrSergei) ChangesThis patch fixes some problems in DAPerror class (unnecessary copy in ctor and typo in getUrlLabel function). During patch testing I found flaky test TestDAP_server.test_server_interrupt (at least 1 fail on 50 runs). Looks like this problem is caused by data race between main and event handler threads. Terminated event can be sent from Disconnect function and event handler. However, only event handler sends exit event. Also, after disconnecting, socket will be closed, so sometimes sending event fails with "write failed: transport IO object invalid" error. I tried to fix this problem by adding a wait for events thread after disconnecting. Failed log example: Full diff: https://github.com/llvm/llvm-project/pull/145010.diff 5 Files Affected:
diff --git a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
index 6d32491eaa5e9..4079eb799a593 100644
--- a/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
+++ b/lldb/packages/Python/lldbsuite/test/tools/lldb-dap/dap_server.py
@@ -489,7 +489,7 @@ def wait_for_exited(self, timeout: Optional[float] = None):
return event_dict
def wait_for_terminated(self, timeout: Optional[float] = None):
- event_dict = self.wait_for_event("terminated", timeout)
+ event_dict = self.wait_for_event("terminated", timeout=timeout)
if event_dict is None:
raise ValueError("didn't get terminated event")
return event_dict
diff --git a/lldb/test/API/tools/lldb-dap/server/TestDAP_server.py b/lldb/test/API/tools/lldb-dap/server/TestDAP_server.py
index ed17044a220d4..116bc53a2dde0 100644
--- a/lldb/test/API/tools/lldb-dap/server/TestDAP_server.py
+++ b/lldb/test/API/tools/lldb-dap/server/TestDAP_server.py
@@ -101,7 +101,8 @@ def test_server_interrupt(self):
# Interrupt the server which should disconnect all clients.
process.send_signal(signal.SIGINT)
- self.dap_server.wait_for_terminated()
+ self.dap_server.wait_for_event(["terminated", "exited"])
+ self.dap_server.wait_for_event(["terminated", "exited"])
self.assertIsNotNone(
self.dap_server.exit_status,
"Process exited before interrupting lldb-dap server",
diff --git a/lldb/tools/lldb-dap/DAPError.cpp b/lldb/tools/lldb-dap/DAPError.cpp
index 60347d577f821..a4747536bde71 100644
--- a/lldb/tools/lldb-dap/DAPError.cpp
+++ b/lldb/tools/lldb-dap/DAPError.cpp
@@ -18,8 +18,8 @@ char DAPError::ID;
DAPError::DAPError(std::string message, std::error_code EC, bool show_user,
std::optional<std::string> url,
std::optional<std::string> url_label)
- : m_message(message), m_ec(EC), m_show_user(show_user), m_url(url),
- m_url_label(url_label) {}
+ : m_message(std::move(message)), m_ec(EC), m_show_user(show_user),
+ m_url(std::move(url)), m_url_label(std::move(url_label)) {}
void DAPError::log(llvm::raw_ostream &OS) const { OS << m_message; }
diff --git a/lldb/tools/lldb-dap/DAPError.h b/lldb/tools/lldb-dap/DAPError.h
index 4c94bdd6ac3d6..e18614fe71935 100644
--- a/lldb/tools/lldb-dap/DAPError.h
+++ b/lldb/tools/lldb-dap/DAPError.h
@@ -30,7 +30,7 @@ class DAPError : public llvm::ErrorInfo<DAPError> {
const std::string &getMessage() const { return m_message; }
bool getShowUser() const { return m_show_user; }
const std::optional<std::string> &getURL() const { return m_url; }
- const std::optional<std::string> &getURLLabel() const { return m_url; }
+ const std::optional<std::string> &getURLLabel() const { return m_url_label; }
private:
std::string m_message;
diff --git a/lldb/tools/lldb-dap/tool/lldb-dap.cpp b/lldb/tools/lldb-dap/tool/lldb-dap.cpp
index 9b9de5e21a742..72c6eceab3658 100644
--- a/lldb/tools/lldb-dap/tool/lldb-dap.cpp
+++ b/lldb/tools/lldb-dap/tool/lldb-dap.cpp
@@ -342,6 +342,7 @@ serveConnection(const Socket::SocketProtocol &protocol, const std::string &name,
<< " disconnected failed: "
<< llvm::toString(std::move(error)) << "\n";
}
+ dap->StopEventHandlers();
// Close the socket to ensure the DAP::Loop read finishes.
sock->Close();
}
|
Comment on lines
104
to
105
| self.dap_server.wait_for_event(["terminated", "exited"]) | ||
| self.dap_server.wait_for_event(["terminated", "exited"]) |
There was a problem hiding this comment.
What's the purpose of doing this twice? To see both events in arbitrary order?
| @@ -489,7 +489,7 @@ def wait_for_exited(self, timeout: Optional[float] = None): | |||
| return event_dict | |||
|
|
|||
| def wait_for_terminated(self, timeout: Optional[float] = None): | |||
| event_dict = self.wait_for_event("terminated", timeout) | |||
| event_dict = self.wait_for_event("terminated", timeout=timeout) | |||
There was a problem hiding this comment.
This doesn't actually change anything, does it?
| @@ -342,6 +342,7 @@ serveConnection(const Socket::SocketProtocol &protocol, const std::string &name, | |||
| << " disconnected failed: " | |||
| << llvm::toString(std::move(error)) << "\n"; | |||
| } | |||
| dap->StopEventHandlers(); | |||
There was a problem hiding this comment.
Should we stop the event handler before we try to disconnect?
There was a problem hiding this comment.
The Disconnect call should cause the DAP::Loop() function to exit, which should be calling StopEventHandlers() as part of the cleanup in DAP::Loop() https://github.com/llvm/llvm-project/blob/main/lldb/tools/lldb-dap/DAP.cpp#L943
We would want the StopEventHandlers() to happen later in the disconnect sequence, to ensure any any terminated_commands are executed and returned prior to the event handles being cleaned up.
ashgti
reviewed
Jun 20, 2025
| // Close the socket to ensure the DAP::Loop read finishes. | ||
| sock->Close(); |
There was a problem hiding this comment.
We may need to remove this sock->Close(). It should be closed when the DAP::Loop() function returns on line 308. I think that might be related to the race happening on interrupt.
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The part about flaky test was moved to separate PR. Also, added tests for DAPError class. |
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✅ With the latest revision this PR passed the C/C++ code formatter. |
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JDevlieghere
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Jun 23, 2025
lldb/unittests/DAP/DAPErrorTest.cpp
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| //===-- DAPErrorTest.cpp | ||
| //-------------------------------------------------------===// |
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@DrSergei Do you need one of us to merge this on your behalf? |
DrSergei
changed the title
Yes, please |
miguelcsx
pushed a commit
to miguelcsx/llvm-project
that referenced
this pull request
Jun 23, 2025
This patch fixes some problems in DAPerror class (unnecessary copy in
ctor and typo in getUrlLabel function). During patch testing I found
flaky test TestDAP_server.test_server_interrupt (at least 1 fail on 50
runs). Looks like this problem is caused by data race between main and
event handler threads. Terminated event can be sent from Disconnect
function and event handler. However, only event handler sends exit
event. Also, after disconnecting, socket will be closed, so sometimes
sending event fails with "write failed: transport IO object invalid"
error. I tried to fix this problem by adding a wait for events thread
after disconnecting.
Failed log example:
```log
1750366596.399511337 lldb-dap server shutdown requested, disconnecting remaining clients...
1750366596.406297684 (client_0) <-- 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1750366596.406688452 (client_0) write failed: transport IO object invalid
1750366596.406724215 (client_0) write failed: transport IO object invalid
1750366596.842197657 (client_0) client disconnected
```
Jaddyen
pushed a commit
to Jaddyen/llvm-project
that referenced
this pull request
Jun 23, 2025
This patch fixes some problems in DAPerror class (unnecessary copy in
ctor and typo in getUrlLabel function). During patch testing I found
flaky test TestDAP_server.test_server_interrupt (at least 1 fail on 50
runs). Looks like this problem is caused by data race between main and
event handler threads. Terminated event can be sent from Disconnect
function and event handler. However, only event handler sends exit
event. Also, after disconnecting, socket will be closed, so sometimes
sending event fails with "write failed: transport IO object invalid"
error. I tried to fix this problem by adding a wait for events thread
after disconnecting.
Failed log example:
```log
1750366596.399511337 lldb-dap server shutdown requested, disconnecting remaining clients...
1750366596.406297684 (client_0) <-- 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1750366596.406688452 (client_0) write failed: transport IO object invalid
1750366596.406724215 (client_0) write failed: transport IO object invalid
1750366596.842197657 (client_0) client disconnected
```
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This patch fixes some problems in DAPerror class (unnecessary copy in ctor and typo in getUrlLabel function). During patch testing I found flaky test TestDAP_server.test_server_interrupt (at least 1 fail on 50 runs). Looks like this problem is caused by data race between main and event handler threads. Terminated event can be sent from Disconnect function and event handler. However, only event handler sends exit event. Also, after disconnecting, socket will be closed, so sometimes sending event fails with "write failed: transport IO object invalid" error. I tried to fix this problem by adding a wait for events thread after disconnecting.
Failed log example: