Factorio Forums

Posted: **Thu Jun 13, 2019 7:51 pm**

Weak Ref 71724
Weak Ref 71917

0.003 2019-06-13 21:22:17; Factorio 0.17.49 (build 45696, win64, steam)

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Steps to reproduce:
1/ Open save (contains replay data to see what i did):

crash-invalid-ghost.zip: (240.92 KiB) Downloaded 140 times

2/ Wait 2s
3/ Crash

log

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Core issue is that if you have tracks, signals have to be separated at least by 2 tiles. This is achived by showing this green "lollipops" showing where you can place signals. If you place signal, tiles 1 in each direction will now be shown as invalid spot for placing signal (no lollipop). Issue is that i was able to manually rotate signal in hand and shift-place it (place ghost) in forbidden spot. After building it by robot, game instantly crashes

Lets call this issue "invalid rail signal position bypass" as without shift, there is alert "invalid rail signal position" for trying to build signal in this forbidden spot.

For this issue to show, there must be train running. Without it signal will just be placed. If in this state train is set to automatic mode, it will just show "no-path"

Issue works also in straight sections:

crash-invalid-ghost-horizontal.zip: (252.74 KiB) Downloaded 133 times

After extensive testing:
- there must be train running
- crash is only when placing signal-ghost on opposite side, exactly 1 tile after existing signal (if existing signal is on bottom, ghost must be on top side, 1 tile to right as in image below)
- signal-ghost must be in correct orientation to affect train segments

: invalid-rail-position.png (491.16 KiB) Viewed 2963 times

Posted: **Thu Jun 13, 2019 8:39 pm**

: shitherewego.png (614.32 KiB) Viewed 2957 times

Posted: **Thu Jun 13, 2019 9:08 pm**

Another case of same issue:
0/ preconditions: loop with running train, 2 waypoints, at least 2 rail segments (as in first post), signals only on one side
1/ enter editor
2/ use Ctrl+C to copy signal
3/ Rotate it to match direction of adhoc-blueprint in hand to opposite side of track
4/ Place blueprint with above signal on opposite side, 1 tile to front.
5/ As editor does silent revive of pasted blueprints, this crashes with different stack trace

log

Posted: **Sat Jun 15, 2019 10:25 am**

Thanks for the report, it is fixed for the next release.

Factorio Forums

[kovarex] [0.17.49] Crash, signal-ghost at forbidden position: "*this->reservedFor == train was not true"

[kovarex] [0.17.49] Crash, signal-ghost at forbidden position: "*this->reservedFor == train was not true"

Re: [0.17.49] Crash, signal-ghost at forbidden position: "*this->reservedFor == train was not true"

Re: [0.17.49] Crash, signal-ghost at forbidden position: "*this->reservedFor == train was not true"

Re: [kovarex] [0.17.49] Crash, signal-ghost at forbidden position: "*this->reservedFor == train was not true"