Permission issue on Yosemite server
The problem is related to accessing the share with a Windows client via SMB. It doesn't happen accessing it with an OS X client via SMB or AFP.

To quickly solve your problem remove all user1 ACLs with 

sudo chmod -R -a "user1 allow list,add_file,search‌​,add_subdirectory,del‌​ete_child,readattr,wr‌​iteattr,readextattr,w‌​riteextattr,readsecur‌​ity,file_inherit,dire‌​ctory_inherit" /Volumes/vol_name/Sh‌​are


Replace vol_name by the proper volume name. If "Share" is the volume name omit the part "/vol_name"

Then add:

sudo chmod +a "everyone allow list,add_file,search‌​,add_subdirectory,del‌​ete_child,readattr,wr‌​iteattr,readextattr,w‌​riteextattr,readsecur‌​ity,file_inherit,dire‌​ctory_inherit" /Volumes/vol_name/Sh‌​are


You may then modify all stubborn subsequent files' and folders' permissions with:

sudo chmod ...




This is no nice solution and I will further inspect the access problem for Windows clients.