Desync in multiplayer

[DorpsGek]

Combuster opened the ticket and wrote:

Net sync error appears between 5 seconds and one minute of connecting a game.

To reproduce:
Start server from save game (attached)
Start a client and connect to the server (either of joining the company and spectating will do)
Wait.
(reproducability: always)

Version used is r19068

Attachments

• OTTDC BV, 4th Jun 2107.sav (712.21 KiB)

Reported version: trunk
Operating system: All

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This issue was imported from FlySpray: https://bugs.openttd.org/task/3619

[DorpsGek]

Combuster wrote:

Minor correction: Reproducability rates lie somewhere around 85%. Repeated attempts to join this game eventually succeed.

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This comment was imported from FlySpray: https://bugs.openttd.org/task/3619#comment7585

[DorpsGek]

frosch wrote:

The desync is caused by trains choosing different platforms at the dropoff station. It is not specific to a certain train or date, but seems to depend on join date. The time until desync varies from few days to few months.

Enabling the yapf cache debugging triggers shortly after loading the game in singleplayer (actually not at the dropoff station). However the stuff in dbg_helper is totally broken :/

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This comment was imported from FlySpray: https://bugs.openttd.org/task/3619#comment7587

[DorpsGek]

planetmaker wrote:

Just a short remark on the savegame: the big drop station is not one station, but 6 separate ones interwoven as much as possible where tracks alternate every station track of it.

EDIT and disabling the yapf cache on both, server and client seems to let me connect without desync (frosch's patch http://devs.openttd.org/~frosch/diffs/disableyapfcache.diff )
EDIT2: Note also the trains' orders: the main drop station is not part of the orders.

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This comment was imported from FlySpray: https://bugs.openttd.org/task/3619#comment7590

[DorpsGek]

Rubidium closed the ticket.

Reason for closing: Fixed

In r19141

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This comment was imported from FlySpray: https://bugs.openttd.org/task/3619