[rdiff-backup-users] SpecialFileError...AF_UNIX path too long

[Thomas H. George]

An attempt to backup my desktop failed with the message:

SpecialFileError /home/tom/.cache/keyring-Jw0E3d/control Socket error: 
AF_UNIX path too long

Reading up on keyrings I learned that Gnome uses a keyring file to 
encode and protect user passwords.  I assume that is what this is.  I 
had stopped gdm3 before starting the backup as an earlier attempted 
backup failed with messages regarding changes in my email files.  To 
avoid that problem I closed my email client and shutdown  gdm3 to close 
the desktop on which it runs. After the latest backup attempt failed I 
restarted gdm3 and found the .cache directory no longer contains 
keyring-Jw0Ed but instead a new directory keyring-Vi8Gy2.

If my understanding is correct there is no need to backup keyring-????? 
as stopping and restarting gdm3 will recreate it.

Any comments or experience with this problem?