make the execpools/* schedulers conditionally infallible
#2733
| Job | Run time |
|---|---|
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| 3m 35s | |
| 12m 32s | |
| 2m 28s | |
| 1m 51s | |
| 2m 26s | |
| 11m 40s | |
| 2m 24s | |
| 1m 51s | |
| 2m 38s | |
| 2m 17s | |
| 4s | |
| 2s | |
| 7s | |
| 1h 3m 11s |