failed to execute "/bin/bash" resource temporarily unavailable in RHEL & Oracle Linux

Getting Error failed to execute "/bin/bash" resource temporarily unavailable error while trying to su or to login as a local user. This error is also observed when logging in as a user using the SSH.

This occurs if the user's number of executing threads has reached the nproc resource limit. The resolution is straightforward:

Step 1 : Check /etc/security/limits.conf and all files in /etc/security/limits.d/ for the current setting of the "nproc" value

Step 2 : Increase the "nproc" value.

Step 3 : We can do this  in /etc/security/limits.conf or in any file in a file in /etc/security/limits.d/.

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