The linux kernel had 3 of those, in 2013: https://blog.cuviper.com/2013/11/10/how-short-can-git-abbreviate/ https://blog.cuviper.com/2013/11/10/how-short-can-gi

The linux kernel had 3 of those, in 2013: https://blog.cuviper.com/2013/11/10/how-short-can-git-abbreviate/ https://blog.cuviper.com/2013/11/10/how-short-can-git-abbrev... By now it's up to at least 7 (going by my clone of 5.12-rc1 that I had lying around), and it's becoming more likely. Those collisions happened with objects other than commits (of which there are more), but that's by no means guaranteed.