fix: avoid race condition in singleton instance method
#3984
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| 3m 57s | |
| 3m 26s | |
| 5m 30s | |
| 1m 29s | |
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| 1m 37s | |
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| 33s | |
| 1m 24s | |
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| 4m 25s | |
| 3m 32s | |
| 1m 56s | |
| 2m 0s | |
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| 3m 38s | |
| 1m 27s | |
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| 1m 26s | |
| 2m 26s | |
| 4m 46s | |
| 3m 29s | |
| 1m 7s | |
| 5m 24s | |
| 1h 32m 20s |