--- /dev/null
+LU-4924 - chmod g+s, touch should not clear sgid bit
+
+ $ mkdir 4924
+ $ cd 4924
+ $ touch f
+ $ chmod u=rwx,g=rwxs f
+ $ ls -l f | awk -- '{ print $1, $3, $4 }'
+ > -rwxrwsr-- root root
+ $ touch f
+ $ ls -l f | awk -- '{ print $1, $3, $4 }'
+ > -rwxrwsr-- root root
+ $ cd ..
+ $ rm -rf 4924