In my opinion, the problem is with autofs, not with tmpfs. Autofs simply doesn't work well when you are using detached fs name spaces and bind mounting. We ran into this problem years ago (with an inhouse spank plugin doing more or less what tmpfs does), and ended up simply not using autofs.
I guess you could try using systemd's auto-mounting features, but I have no idea if they work better than autofs in situations like this. We ended up using a system where the prolog script mounts any needed file systems, and then the healthcheck script unmounts file systems that are no longer needed. -- Regards, Bjørn-Helge Mevik, dr. scient, Department for Research Computing, University of Oslo
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