Salt 3006.11 introduced the ipc_write_timeout option which may be reached where the salt master takes a long time to return
Similar issues can be caused by missing engines from the master config, or outdated cache on the master - please see the Additional Information for this more general advice
This issue will be resolved in the Salt 3006.15 release.
Increasing the ipc_write_timeout value in salt master config to 60 seconds may alleviate the issue. For example, create /etc/salt/master.d/ipc.conf with:
ipc_write_timeout: 60
It is also important to make sure you follow the upgrade instructions on TechDocs carefully: the salt-master configuration should be re-generated after an upgrade and the new config tailored to your needs.
/opt/saltstack/salt/extras-3.10/bin/sseapi-config --default >/tmp/raas.conf/etc/salt/master.d/raas.conf with this newline created and updated file
Refreshing the cache directory on the salt master can also help in some instances:
systemctl stop salt-mastermv /var/cache/salt/master ~/salt-cache-backupsystemctl start salt-master