ORA-27303: additional information: startup egid = 5003 (asmadmin), current egid = 5000 (oinstall)

I've got the following info on several occasions:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
ORA-27140: attach to post/wait facility failed
ORA-27300: OS system dependent operation:invalid_egid failed with status: 1
ORA-27301: OS failure message: Operation not permitted
ORA-27302: failure occurred at: skgpwinit6
ORA-27303: additional information: startup egid = 5003 (asmadmin), current egid = 5000 (oinstall)

It seems the problem arises from wrong permissions on oracle binary files. More explanations here - https://asanga-pradeep.blogspot.dk/2012/06/ora-27303-additional-information.html.