LTSP fat client freeze

Hi,

Just to share an experience. We had to debug a freezing on fat clients : on 18.04, Gnome was freezing after 10min inactivity.

Usually, freezing is caused when NBD connection is lost ; it wasn't the case.

Relation to inactivity suggested an issue with suspend / screensaver. So we disabled suspend, as did Alkis in a recent commit (https://git.launchpad.net/ltsp/commit/?id=dc8fb26f26989f28c36ae69b1684adc63afb1640). The issue remained.

Nothing in logs, both on client and server. It turned out it was sshfs hanging ; probably due to a timeout on a stateful firewall. When sshfs hangs in this way, there is no error.

The solution was to use LDM_SSHOPTIONS="-o ServerAliveInterval=30" in lts.conf as recommended here : https://github.com/smheidrich/sshfs/blob/master/sshfs.rst#sshfs-hangs

Best,

Maxime


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