Crashes related to road vehicle routing

[RESTRICTED ACCOUNT]

This crash has been occurring often with demo.sve for a long time now (probably more than a year).
The timing at which they occur is almost always random.
So I can't submit a save just before the crash, but it's the crash I most encounter when testing on demo.sve.

This happens even if I'm only testing the GUI, and I don't think the changes I made are related to this crash.

The coordinates of these two points are ordinary roads and appear to be connected.

EDIT:
It turns out that this happens not only in private cars but also in player's road vehicles.

[jamespetts]

Interesting - thank you for the report. Can this reliably be reproduced with demo.sve running in fast forward mode for a period of time?

[RESTRICTED ACCOUNT]

Can this reliably be reproduced with demo.sve running in fast forward mode for a period of time?

Probably no. In my experience this often occurs a few seconds after resuming from an automatic save.
If that does not occur at that time it is unlikely that it will.

[RESTRICTED ACCOUNT]

It turns out that this happens not only in private cars but also in player's road convoys.
I ran into this kind of crash again in demo.sve and checked the backtrace and it seems that get_weg() fails on (179,16,6) when searching for a route from (169,4,6) to (143,9,6).
However, this crash cannot always be reliably reproduced...

[jamespetts]

Hmm - it is extremely difficult to fix problems that cannot reliably be reproduced, as most types of fixing will involve repeatedly invoking the crash after making many small changes to test how each of those changes affects the processes leading to the crash.