diff --git a/pkg/ingester/ingester.go b/pkg/ingester/ingester.go
index 516d7ec7033..42396fe5166 100644
--- a/pkg/ingester/ingester.go
+++ b/pkg/ingester/ingester.go
@@ -2570,7 +2570,7 @@ func (i *Ingester) createTSDB(userID string, walReplayConcurrency int) (*userTSD
 			localSeriesLimit: initialLocalLimit,
 		},
 	}
-	userDB.resetSymbolTable()
+	userDB.resetSymbolTable(i.logger)
 	userDB.triggerRecomputeOwnedSeries(recomputeOwnedSeriesReasonNewUser)
 
 	oooTW := i.limits.OutOfOrderTimeWindow(userID)
@@ -3089,7 +3089,7 @@ func (i *Ingester) compactBlocks(ctx context.Context, force bool, forcedCompacti
 		default:
 			reason = "regular"
 			err = userDB.Compact()
-			userDB.resetSymbolTable()
+			userDB.resetSymbolTable(i.logger)
 		}
 
 		if err != nil {
diff --git a/pkg/ingester/user_tsdb.go b/pkg/ingester/user_tsdb.go
index bb553935090..dde84372bd6 100644
--- a/pkg/ingester/user_tsdb.go
+++ b/pkg/ingester/user_tsdb.go
@@ -11,6 +11,7 @@ import (
 	"math"
 	"sync"
 	"time"
+	"unsafe"
 
 	"github.com/go-kit/log"
 	"github.com/go-kit/log/level"
@@ -629,11 +630,20 @@ func (u *userTSDB) computeOwnedSeries() int {
 	return count
 }
 
-func (u *userTSDB) resetSymbolTable() {
+type hackSymbolTable struct {
+	mx      sync.Mutex
+	p       unsafe.Pointer
+	nextNum int
+}
+
+func (u *userTSDB) resetSymbolTable(logger log.Logger) {
 	var st *labels.SymbolTable
 	if u.db != nil && u.db.Head() != nil {
+		level.Info(logger).Log("msg", "RebuildSymbolTable starting")
 		// Compact all labels in head into one SymbolTable.
 		st = u.Head().RebuildSymbolTable()
+		x := (*hackSymbolTable)(unsafe.Pointer(st))
+		level.Info(logger).Log("msg", "RebuildSymbolTable finished", "addr", fmt.Sprintf("%p: %v", x, x), "size", st.Len())
 	} else {
 		st = labels.NewSymbolTable()
 	}