From 2a76d2ecbcfe4f5c8bd699952f9f09245fd778a5 Mon Sep 17 00:00:00 2001
From: Paul Buetow <paul@buetow.org>
Date: Sat, 18 Apr 2026 13:33:48 +0300
Subject: Fix Recorder.Stop error propagation for task 65

---
 internal/parquet/recorder.go      |  7 ++++++-
 internal/parquet/recorder_test.go | 21 +++++++++++++++++++++
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/internal/parquet/recorder.go b/internal/parquet/recorder.go
index f489b68..4c201e9 100644
--- a/internal/parquet/recorder.go
+++ b/internal/parquet/recorder.go
@@ -73,6 +73,7 @@ type recordingSession struct {
 	mu        sync.Mutex
 	accepting bool
 	stopCause error
+	doneErr   error
 	stopOnce  sync.Once
 }
 
@@ -161,7 +162,10 @@ func (r *Recorder) Stop() error {
 	}
 
 	session.stop(nil)
-	return <-session.doneC
+	if err := <-session.doneC; err != nil {
+		return err
+	}
+	return session.doneErr
 }
 
 // Status returns a snapshot of the recorder state.
@@ -268,6 +272,7 @@ func (r *Recorder) abortSession(session *recordingSession, writer rowWriter, err
 
 func (r *Recorder) completeSession(session *recordingSession, err error) {
 	r.finishSession(session, err)
+	session.doneErr = err
 	session.doneC <- err
 	close(session.doneC)
 }
diff --git a/internal/parquet/recorder_test.go b/internal/parquet/recorder_test.go
index d4caa11..66c22a3 100644
--- a/internal/parquet/recorder_test.go
+++ b/internal/parquet/recorder_test.go
@@ -111,6 +111,27 @@ func TestRecorderFailsOnQueueOverflow(t *testing.T) {
 	}
 }
 
+func TestRecorderStopReturnsTerminalErrorOnRepeatedCalls(t *testing.T) {
+	recorder := NewRecorder(RecorderConfig{})
+	session := newRecordingSession(1)
+	session.doneErr = ErrRecorderQueueFull
+	close(session.doneC)
+
+	recorder.mu.Lock()
+	recorder.active = session
+	recorder.status = Status{
+		Active:    true,
+		LastError: ErrRecorderQueueFull,
+	}
+	recorder.mu.Unlock()
+
+	for i := 0; i < 2; i++ {
+		if err := recorder.Stop(); !errors.Is(err, ErrRecorderQueueFull) {
+			t.Fatalf("Stop() call %d error = %v, want %v", i+1, err, ErrRecorderQueueFull)
+		}
+	}
+}
+
 func testStreamRow(seq uint64, syscall string, isError bool) streamrow.Row {
 	return streamrow.Row{
 		Seq:        seq,
-- 
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