[wheybags] [0.16.22] Odd train behavior and desync

[porksmash]

A buddy was messing around with trains and created a rail setup that causes the train to stutter forward (similar to this issue) until it eventually no-paths, stops, and then moves forward normally. It loops back around to the bottom station and repeats. This eventually caused a permanent desync on the server and nobody was able to log into the game. We were able to isolate the setup that caused the issue and recreate the desync in a brand new map with only a few rails and stations, which is the desync report I attached. If you would like the first desync report in our actual map, I can attach it as well. We thought it was odd that the train stuttering only happens on one particular station in the loop, when they are all set up identically.

[Loewchen]

Are you using mods or a custom scenario?

[porksmash]

I used creative mod in single player to set up the map in the desync report, but loaded into a server with no mods or custom scenarios in order to create the desync

[wheybags]

I couldn't reproduce the desync, but I have fixed the train stuttering.
Is it enough to just start a server, then connect to that server with one client and wait? How long does it take for you before it desyncs?

[Rseding91]

I couldn't reproduce the desync, but I have fixed the train stuttering.
Is it enough to just start a server, then connect to that server with one client and wait? How long does it take for you before it desyncs?

I tried to reproduce the desync my self the other day when this was first reported and couldn't. I ran the save for 5 minutes in heavy mode and it had no problems.

[porksmash]

On the demo map in desync report my buddy triggered the desync by running in front of the train after it hit the no path and resumed, while I stood watching. From my POV he didn't move, just desynced and got booted offline. I did not desync and stayed in game. I'll see if I can reproduce again.

[porksmash]

Well we spent about 30 minutes trying to recreate it and failed, both on the demo map and our actual save. I can provide the original desync report on the large map, but it is too large to attach. Do you need it?

[wheybags]

I think it's fine, let us know if you can reproduce it again in 0.16.24 once it's released.
Thanks for the report!