The `T9405` testcase currently fails on Windows, ``` =====> T9405(normal) 8 of 14 [0, 1, 0] cd "./rts/T9405.run" && $MAKE -s --no-print-directory T9405 Wrong exit code (expected 0 , actual 2 ) Stdout: [1 of 1] Compiling Main ( T9405.hs, T9405.o ) Linking T9405.exe ... Stderr: make[1]: *** [Makefile:50: T9405] Error 1 ``` Contrary to what was suggested in [ticket:12004\#comment:120267](https://gitlab.haskell.org//ghc/ghc/issues/12004#note_120267) it looks like the problem is that an empty `.ticky` file is produced. Even increasing the `sleep` time to 10 seconds (after bumping the sleep in `T9405.hs` accordingly) doesn't change this, so I suspect there is a runtime system bug here.