How to enable further debug on cifs upcalling mechanism

Solution In Progress - Updated -

Issue

CIFS mount attempts using kerberos security uses cifs.upcall userspace helper mechanism to obtain, via request-key callout program, kerberos session keys using key type cifs.spnego.

Sometimes it might be useful to increase verbosity of this userland part.

Environment

  • CIFS
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

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