Why the message "bash fork Cannot allocate memory" occurs during ssh login?

Solution Verified - Updated -

Issue

  • The system reboots with the below error message :
-bash: fork: Cannot allocate memory
  • Unable to login to the user with the following error on the console.
System error for create: "Cannot allocate memory"
  • The system does not respond and gives below error at the login or while running commands.
-bash: fork: Cannot allocate memory

Environment

  • Red Hat Enterprise Linux (RHEL) 5, 6, 7

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