Fix flaky gdb tests by detaching from inside the bp commands

Replace the racy 'inner continue, outer continue, quit' pattern with
'detach, quit' inside the breakpoint commands. After the previous
inner continue, the inferior could exit and the gdb stub could close
the remote before gdb dispatched the outer continue, producing
'Remote connection closed' and a non-zero exit. The new shape lets
the host run the guest call to completion on its own after detach,
with no pending remote work in gdb.

Signed-off-by: Ludvig Liljenberg <4257730+ludfjig@users.noreply.github.com>

Author: ludfjig

src/hyperlight_host/examples/guest-debugging/main.rs

@@ -129,7 +129,17 @@ mod tests {
 
     /// Build a gdb script that connects to `port`, sets a single
     /// breakpoint at `breakpoint`, prints `echo_msg` when hit, and
-    /// continues to completion.
+    /// detaches before quitting.
+    ///
+    /// The breakpoint commands end with `detach` + `quit` instead of
+    /// `continue`. The previous "inner continue, outer continue, quit"
+    /// shape races with the inferior exit. After the breakpoint hits
+    /// and the inner `continue` resumes the guest, the guest may run
+    /// to completion and the gdb stub may close the remote before gdb
+    /// has dispatched the outer `continue`, producing a non-zero exit
+    /// with `Remote connection closed`. Detaching from the breakpoint
+    /// commands removes that window. The host process keeps running
+    /// the guest call to completion on its own after detach.
     fn single_breakpoint_script(
         manifest_dir: &str,
         port: u16,
@@ -150,13 +160,12 @@ mod tests {
                     echo \"{echo_msg}\\n\"
                     backtrace
 
-                    continue
+                    set logging enabled off
+                    detach
+                    quit
                 end
 
                 continue
-
-                set logging enabled off
-                quit
             "
         );
         #[cfg(windows)]
@@ -337,16 +346,14 @@ mod tests {
                     break +2
                     commands 2
                         print $xmm1.v4_float
-                        continue
+                        set logging enabled off
+                        detach
+                        quit
                     end
                     continue
                 end
-                
 
                 continue
-
-                set logging enabled off
-                quit
             "
         );