Fix potential deadlock in hedging request #15561

Job	Run time
Go build with -tags=stringlabels	52s
Go build with -tags=stringlabels	52s
Check misspelled words	11s
Check misspelled words	11s
Go build for different platforms	9m 18s
Go build for different platforms	9m 18s
Linters (Static Analysis) for Go	2m 39s
Linters (Static Analysis) for Go	2m 39s
Thanos end-to-end tests (8, 0)	5m 19s
Thanos end-to-end tests (8, 0)	5m 19s
Thanos unit tests	11m 42s
Thanos unit tests	11m 42s
Thanos end-to-end tests (8, 1)	3m 50s
Thanos end-to-end tests (8, 1)	3m 50s
Thanos end-to-end tests (8, 2)	3m 51s
Thanos end-to-end tests (8, 2)	3m 51s
Thanos end-to-end tests (8, 3)	4m 43s
Thanos end-to-end tests (8, 3)	4m 43s
Thanos end-to-end tests (8, 4)	7m 20s
Thanos end-to-end tests (8, 4)	7m 40s
Thanos end-to-end tests (8, 5)	4m 26s
Thanos end-to-end tests (8, 5)	4m 26s
Thanos end-to-end tests (8, 6)	4m 35s
Thanos end-to-end tests (8, 6)	4m 35s
Thanos end-to-end tests (8, 7)	3m 52s
Thanos end-to-end tests (8, 7)	3m 52s
	2h 5m 36s

Provide feedback