ksh: 0403-030 The fork function failed. Too many processes already exist.

ksh: 0403-030 The fork function failed. Too many processes already exist. Steps to resolve the above issue: 1) Check the process and look for defunct processes and owner of the process. Defunct process is zombie process and do not take much resources but in this cases caused too many files exist for the particular user which generate the above error. We have to kill this processes in order to release it. The only way is to kill the parent processes for that particular owner. Reboot help too but we can avoid it. 2) Communicate with the user and retrieve all the parent processes that running under this owner. Request permission to kill all the process in order to release all the defunct processes.