Description of problem: "error_string" in the metadata of MClientSession is for humans and shouldn't be part of the on-wire format. Stop relying on it and do something more in line with what ceph-fuse does (i.e. add emit_blocklist_events() infrastructure to libceph and consume it from fs/ceph). Please find the upstream tracker attached for information.
Please specify the severity of this bug. Severity is defined here: https://bugzilla.redhat.com/page.cgi?id=fields.html#bug_severity.
*** This bug has been marked as a duplicate of bug 2005960 ***