diff --git a/pkg/logql/log/fmt_test.go b/pkg/logql/log/fmt_test.go
index 06cf20c37606..6307a8c3a925 100644
--- a/pkg/logql/log/fmt_test.go
+++ b/pkg/logql/log/fmt_test.go
@@ -2,6 +2,7 @@ package log
 
 import (
 	"fmt"
+	"sync"
 	"testing"
 	"time"
 
@@ -923,3 +924,46 @@ func TestInvalidUnixTimes(t *testing.T) {
 	_, err = unixToTime("464")
 	require.Error(t, err)
 }
+
+func TestMapPool(t *testing.T) {
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+	wgFinished := sync.WaitGroup{}
+
+	ls := labels.FromStrings("cluster", "us-central-0")
+	builder := NewBaseLabelsBuilder().ForLabels(ls, ls.Hash())
+	a := newMustLineFormatter(`[1m{{if .level }}{{alignRight 5 .level}}{{else if .severity}}{{alignRight 5 .severity}}{{end}}[0m [90m[{{alignRight 10 .resources_service_instance_id}}{{if .attributes_thread_name}}/{{alignRight 20 .attributes_thread_name}}{{else if eq "java" .resources_telemetry_sdk_language }}                    {{end}}][0m [36m{{if .instrumentation_scope_name }}{{alignRight 40 .instrumentation_scope_name}}{{end}}[0m {{.body}} {{if .traceid}} [37m[3m[traceid={{.traceid}}]{{end}}`)
+	a.Process(0,
+		[]byte("logger=sqlstore.metrics traceID=XXXXXXXXXXXXXXXXXXXXXXXXXXXX t=2024-01-04T23:58:47.696779826Z level=debug msg=\"query finished\" status=success elapsedtime=1.523571ms sql=\"some SQL query\" error=null"),
+		builder,
+	)
+
+	for i := 0; i < 100; i++ {
+		wgFinished.Add(1)
+		go func() {
+			wg.Wait()
+			a := newMustLineFormatter(`[1m{{if .level }}{{alignRight 5 .level}}{{else if .severity}}{{alignRight 5 .severity}}{{end}}[0m [90m[{{alignRight 10 .resources_service_instance_id}}{{if .attributes_thread_name}}/{{alignRight 20 .attributes_thread_name}}{{else if eq "java" .resources_telemetry_sdk_language }}                    {{end}}][0m [36m{{if .instrumentation_scope_name }}{{alignRight 40 .instrumentation_scope_name}}{{end}}[0m {{.body}} {{if .traceid}} [37m[3m[traceid={{.traceid}}]{{end}}`)
+			a.Process(0,
+				[]byte("logger=sqlstore.metrics traceID=XXXXXXXXXXXXXXXXXXXXXXXXXXXX t=2024-01-04T23:58:47.696779826Z level=debug msg=\"query finished\" status=success elapsedtime=1.523571ms sql=\"some SQL query\" error=null"),
+				builder,
+			)
+			wgFinished.Done()
+		}()
+	}
+	for i := 0; i < 100; i++ {
+		wgFinished.Add(1)
+		j := i
+		go func() {
+			wg.Wait()
+			m := smp.Get()
+			for k, v := range m {
+				m[k] = fmt.Sprintf("%s%d", v, j)
+			}
+			smp.Put(m)
+			wgFinished.Done()
+
+		}()
+	}
+	wg.Done()
+	wgFinished.Wait()
+}