membuffer: fix data race when IsReadOnly and Set may be concurrently invoked
#4950
| Job | Run time |
|---|---|
| 3m 4s | |
| 1m 40s | |
| 2m 17s | |
| 7m 1s |
IsReadOnly and Set may be concurrently invoked
#4950
| Job | Run time |
|---|---|
| 3m 4s | |
| 1m 40s | |
| 2m 17s | |
| 7m 1s |