Due to a bug in the Linux CIFS client, SMB2.0+ connections from Linux to Red Hat Gluster Storage currently will not work properly. SMB1 connections from Linux to Red Hat Gluster Storage, and all connections with supported protocols from Windows continue to work.
If practical, restrict Linux CIFS mounts to SMB version 1. The simplest way to do this is to not specify the 'vers' mount option, since the default setting is to use only SMB version 1. If restricting Linux CIFS mounts to SMB1 is not practical, disable asynchronous I/O by setting 'aio read size' to 0.