SMB shares fail to mount or are read-only

Solution Verified - Updated -

Issue

  • Client CIFS mount stopped working after upgrading to RHEL 7.5.
  • A SMB share can not be mounted on RHEL 7.5, or is read-only, but can be mounted on RHEL 7.4.
  • A SMB share can not be mounted on RHEL 7.7, or is read-only, but can be mounted on RHEL 7.6.

Environment

  • Red Hat Enterprise Linux 7
  • kernel-3.10.0-123.el7 upto kernel-3.10.0-862.el7, kernel-3.10.0-1062.el7 and later
  • kernel-3.10.0-862.el7 upto kernel-3.10.0-1062.el7
  • SMB or SMB2

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