Avoid blocking during disk alerts #347

Job	Run time
build-and-test (fedora:latest, gcc)	2m 7s
build-and-test (ubuntu:latest, clang)	1m 25s
build-and-test (ubuntu:latest, gcc)	1m 24s
build-and-test (fedora:latest, clang)	1m 40s
	6m 36s

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