Stray 'rsession' without 'rserver' process - what can be done?

[HenrikBengtsson]

A user reported running rsession process, without anything else running;

$ rsc status --full
rserver: not running
rsession: running (PID 2651743; cpu=98.8%, ram=0.6%, rss=2441864 KiB, vsize=3107960 KiB, state=R, since=Tue Jan 16 18:22:51 2024) on machine (server.example.org)
rserver monitor: not running
SSH reverse tunnel (optional): not running
lock file: exists (/home/alice/.config/rsc/pid.lock)
$ 

What can we do here? Do we have any other option that kill the rsession process(es)? Could it be that there's a way for the RStudio Server to reconnect to these processes?

See also

Issue #87

[HenrikBengtsson]

Moving Issue #87 here. It would be useful if rsc status would produce a warning about stray rsession processes, e.g.

$ rsc status --full
rserver: not running
rsession: running (PID 2651743; cpu=98.8%, ram=0.6%, rss=2441864 KiB, vsize=3107960 KiB, 
state=R, since=Tue Jan 16 18:22:51 2024) on machine (server.example.org)
rserver monitor: not running
SSH reverse tunnel (optional): not running
lock file: exists (/home/alice/.config/rsc/pid.lock)
WARNING: There are appear to be stray 'rsession' processing running. These cannot be 
recovered. To terminate them, run 'rsc stop'.

[HenrikBengtsson]

Now rsc start asserts that there are no stray rsession processes already running. This might detect a few more cases up front. It already asserted that rserver was not already running.

[HenrikBengtsson]

See more or less duplicate #108