Syncs from Gmail fail with EOF

[Felix E. K. <fel...@in...>]

I don’t manage to get a full sync from Gmail with isync 1.1.0:

    $ mbsync gmail
    Reading configuration file /home/ec2-user/.mbsyncrc
    Channel gmail
    Opening master gmail-imap...
    Resolving imap.gmail.com... ok
    Connecting to imap.gmail.com (173.194.66.108:993)...
    Opening slave gmail-local...
    Connection is now encrypted
    Logging in...
    Selecting master [Gmail]/All Mail...
    Selecting slave INBOX...
    Loading master...
    Loading slave...
    slave: 64 messages, 0 recent
    master: 34900 messages, 0 recent
    Synchronizing...
    M: +0/0 *0/0 #0/0  S: +64/34900 *0/0 #0/0
    Socket error: secure read from imap.gmail.com (173.194.66.108:993):
    unexpected EOF

*How do I make backing up Gmail work reliably?*

My `.mbsyncrc` is the same as the one I just posted in the thread “How
to avoid colons in file names?”:

    IMAPAccount gmail
    Host imap.gmail.com
    User fe...@f7...
    PassCmd "/bin/cat /secret/gmail_password"
    UseIMAPS yes
    CertificateFile ~/.mbsync/Equifax_Secure_Certificate_Authority.pem

    IMAPStore gmail-imap
    Account gmail

    MaildirStore gmail-local
    Path "~/sync_test"
    Inbox "~/sync_test/INBOX"
    AltMap yes

    Channel gmail
    Master ":gmail-imap:[Gmail]/All Mail"
    Slave :gmail-local:INBOX
    Create Slave
    Expunge Slave
    Sync Pull