T7919 fails about 30 times a month
On x86_64-linux, T7919 timed out ~30 times during July 2022.
And again ~30 times in September 2022.
(Edit: it may simply fail for every nightly run!)
I marked it as fragile in !9095 (merged) .
Some recent examples:
https://gitlab.haskell.org/ghc/ghc/-/jobs/1192232
https://gitlab.haskell.org/ghc/ghc/-/jobs/1192742
https://gitlab.haskell.org/ghc/ghc/-/jobs/1193295
https://gitlab.haskell.org/ghc/ghc/-/jobs/1193365
https://gitlab.haskell.org/ghc/ghc/-/jobs/1194067
https://gitlab.haskell.org/ghc/ghc/-/jobs/1194772