Road suddenly uses 100% of caravan's resources

[hopeseekr]

Version: Rimworld 1.2 and 1.4.

I have a huge work caravan with more elephants than you can shake a stick at. Seriously, it'd take you several days to count the elephants with a stick ⭕

The caravan has 119,241 kg of supplies, including 59,511 pieces of steel, 32,000 of assorted stone, 10,000 wood, and ~12,000 chemfuel. 1 human. The caravan is overloaded by 19,241 kg.

The road construction was paused for some time (I think a year) while the colonists stripmined a nearby mountainous area.

When construction resumed, the caravan immediately gave the "Out of Resources" notice for converting a stone road to an asphalt road, and the caravan lost 100% of its stone blocks and weight is immediately reduced to 52,251 kg.

I've had this happen several times.

What doesn't work:

1. Splitting the caravan. The main caravan still empties all the stone blocks on the next tile build.
2. Cancelling the road and starting over (same thing).

What does work:

1. Send the entire caravan into a settlement.
2. Resend the caravan.

[s-reich]

I do have the same issue, although with a much smaller setup: can't build my first piece of road, because every time it should finish, it eats all my resources and resets its progress.

In the savefile, the road site looks like that:

                                        <li Class="RoadsOfTheRim.RoadConstructionSite">
                                                <def>RoadConstructionSite</def>
                                                <ID>546</ID>
                                                <tile>111660</tile>
                                                <faction>null</faction>
                                                <creationGameTicks>16889464</creationGameTicks>
                                                <questTags IsNull="True" />
                                                <RotR_site_costs>
                                                        <keys>
                                                                <li>Work</li>
                                                                <li>WoodLog</li>
                                                                <li>Stone</li>
                                                                <li>Steel</li>
                                                        </keys>
                                                        <values>
                                                                <li>1745</li>
                                                                <li>349</li>
                                                                <li>2617</li>
                                                                <li>436</li>
                                                        </values>
                                                </RotR_site_costs>
                                                <RotR_site_left>
                                                        <keys>
                                                                <li>Work</li>
                                                                <li>WoodLog</li>
                                                                <li>Stone</li>
                                                                <li>Steel</li>
                                                        </keys>
                                                        <values>
                                                                <li>50.44626</li>
                                                                <li>0</li>
                                                                <li>0</li>
                                                                <li>0</li>
                                                        </values>
                                                </RotR_site_left>
                                                <roadToBuild>StoneRoadBuilt</roadToBuild>
                                                <helpFromFaction>null</helpFromFaction>
                                                <LastLeg>WorldObject_549</LastLeg>
                                        </li>

@emipa606 -- did some code review.... is it possible there's an integer underflow / negative percentage happening here, when the caravan can do more work than is actually left to do?

RoadsOfTheRim/Source/RoadsOfTheRim/RoadsOfTheRim.cs

Line 162 in f581b5f

var percentOfWorkLeftToDoAfter = (siteComp.GetLeft("Work") - amountOfWork) / siteComp.GetCost("Work");