fix: avoid race condition in singleton instance method
#3997
| Job | Run time |
|---|---|
| 7m 36s | |
| 3m 40s | |
| 3m 17s | |
| 5m 33s | |
| 1m 24s | |
| 2m 35s | |
| 3m 15s | |
| 2m 10s | |
| 3m 10s | |
| 1m 9s | |
| 2m 0s | |
| 2m 47s | |
| 3m 27s | |
| 2m 38s | |
| 4m 3s | |
| 4m 44s | |
| 4m 15s | |
| 3m 19s | |
| 1m 55s | |
| 1m 50s | |
| 1m 19s | |
| 3m 13s | |
| 20s | |
| 1m 49s | |
| 1m 55s | |
| 2m 21s | |
| 4m 36s | |
| 3m 10s | |
| 1m 44s | |
| 4m 54s | |
| 1h 30m 8s |