When running git ( Git-18.104.22.168-32-bit.exe) at r72556, and starting the bash shell (mingw32) three windows are kept opened as shown in my screenshot. This doesn't happen on Windows XP!
I've already reported this at
CORE-11904 but HBelusca told me to create a separate ticket for this issue.
As requested I'm also submitting a full debug log. The shutdown was not clean.
Related code in Cygwin code: