From 019f68854638e1a7043f2b403c66bf9ef5f6f198 Mon Sep 17 00:00:00 2001
From: Patrick Fuchs <email@patrick-fuchs.com>
Date: Fri, 20 Mar 2026 15:07:31 +0200
Subject: [PATCH] Fix spinner race condition

---
 output/spinner.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/output/spinner.go b/output/spinner.go
index 4ff870728..6776657e9 100644
--- a/output/spinner.go
+++ b/output/spinner.go
@@ -20,12 +20,14 @@ package output
 
 import (
 	"fmt"
+	"sync"
 	"time"
 
 	"github.com/gosuri/uilive"
 )
 
 var spinnerCharset = []rune{'⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏'}
+var mu = sync.Mutex{}
 
 type Spinner struct {
 	prefix string
@@ -46,7 +48,10 @@ func (s *Spinner) Start() {
 }
 
 func (s *Spinner) run() {
+	mu.Lock()
+	// writes to global variable, need a global lock to avoid race conditions
 	writer := uilive.New()
+	mu.Unlock()
 
 	ticker := time.NewTicker(100 * time.Millisecond)
 
@@ -56,7 +61,10 @@ func (s *Spinner) run() {
 		select {
 		case <-s.done:
 			_, _ = fmt.Fprintf(writer, "\r")
+			mu.Lock()
+			// writes to global variable, need a global lock to avoid race conditions
 			_ = writer.Flush()
+			mu.Unlock()
 			close(s.done)
 			return
 		case <-ticker.C: