I think I fixed this. MR at https://salsa.debian.org/debian/grep/-/merge_requests/21 and upstream bug against uutils timeout(1) reported at https://github.com/uutils/coreutils/issues/14977
Bug#1149338: Acknowledgement (grep: autopkgtest upstream-test failing (at least on Ubuntu Resolute))
- Bug#1149338: grep: autopkgtest upstream-test failing (at... Otto Kekäläinen
- Bug#1149338: Acknowledgement (grep: autopkgtest ups... Otto Kekäläinen

