Dwarf Fortress Bug Tracker - Dwarf Fortress
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0009456Dwarf FortressDwarf Mode -- Itemspublic2016-01-08 12:312019-11-24 03:01
Toady One 
normalminorhave not tried
needs feedbackreopened 
0009456: Dwarves claim ownership of an item they pick up that matches a preference, then never put it down.
Some dwarves accumulate objects in their right hands which they never put down. DFHack indicates that these objects have become owned by the dwarf, even though they would not normally be objects that a dwarf would claim as owned.

In all cases observed so far, each dwarf has a material or item type preference matching the object.

Observed with the following cases:

Dwarf with a preference for green glass holding several green glass pots in the right hand, some containing booze, some empty.

Dwarf with a preference for coins holding a steel coin in right hand.

Dwarf with a preference for iron holding an iron minecart in right hand.
As an experiment, using dfhack:

- the items were removed from the dwarfs owned object list
- the ownership record was removed from the item
- the object was marked for dumping

At that point, another dwarf would come get the item and dump it. But in the case of the iron minecart (the first observed case) dwarf would immediately claim ownership of the item when they picked it back up and refuse to drop it. (This time it was full of magma, so that dwarf has a severely burned right hand now.)

The experiment was repeated, removing the ownership association, with one additional step:

- Modify the preference of that dwarf so they no longer prefer the item or material type of the owned object.

So far (0000001:0000001 game year), dwarves who have had their preferences changed have ceased claiming ownership of items.

This isn't a full reproduction of the bug, as it demonstrates only a strongly correlated end to symptoms.

The next step would be to start a game with dwarves having preferences for very common materials/items and see if they claim and refuse to drop items that match their preferences.
Maybe this is related to: 0009443: Dwarfs acquire and equip multiple empty goblets?

Brief writeup and discussion with screenshots: http://www.bay12forums.com/smf/index.php?topic=155375.0 [^]

From 0009237:
http://dffd.bay12games.com/file.php?id=11378 [^]
No tags attached.
has duplicate 0009480resolved Dwarfu Dwarves will claim metal minecarts for themselves 
has duplicate 0009237resolved Dwarfu Haulers claim ownership of wheelbarrows then carry them everywhere 
has duplicate 0009463resolved Dwarfu Announce spam of child dropping cups 
related to 0010832acknowledged Loci Foriegn wood arrows claimed as personal dwarf trinket 
Issue History
2016-01-08 12:31gchristopherNew Issue
2016-01-08 14:58TzalizkanNote Added: 0034369
2016-01-08 17:29greycatNote Added: 0034373
2016-01-08 17:35gchristopherNote Added: 0034374
2016-01-14 09:11solswordNote Added: 0034424
2016-01-16 08:48DwarfuRelationship addedhas duplicate 0009480
2016-01-18 01:57DwarfuRelationship addedhas duplicate 0009237
2016-01-18 01:59DwarfuAdditional Information Updatedbug_revision_view_page.php?rev_id=13898#r13898
2016-01-18 02:01DwarfuAssigned To => Dwarfu
2016-01-18 02:01DwarfuStatusnew => confirmed
2016-01-18 16:17Toady OneStatusconfirmed => resolved
2016-01-18 16:17Toady OneFixed in Version => Next Version
2016-01-18 16:17Toady OneResolutionopen => fixed
2016-01-18 16:17Toady OneAssigned ToDwarfu => Toady One
2016-01-19 20:24DwarfuRelationship addedhas duplicate 0009463
2019-11-17 18:25gchristopherNote Added: 0039586
2019-11-17 18:25gchristopherStatusresolved => needs feedback
2019-11-17 18:25gchristopherResolutionfixed => reopened
2019-11-24 03:01FantasticDorfNote Added: 0039590
2020-02-26 19:24LociRelationship addedrelated to 0010832
2020-02-26 21:54HuntthetrollIssue Monitored: Huntthetroll

2016-01-08 14:58   
Have you tried giving the dwarves their own room with a container to put the items in?
2016-01-08 17:29   
Almost certainly related to 0009443.
2016-01-08 17:35   
Yes, all dwarves had a room with a non-full cabinet and chest. I suspect that since the items were ones not normally owned, ("Oh hey! IRON minecart! It's mine!") they didn't have any idea what to do with them, other than let them build up in their right hands.
2016-01-14 09:11   
Just confirming this bug. Dwarf with preference for iron claimed an iron minecart as owned and proceeded to take it everywhere with her like a safety blanket. Of course this slows her speed to near-zero, so I've unassigned her from all but menial tasks.

When I had her drop her pick (she was a miner) she switched to a multigrasp on the minecart. "MINE, I TELL YOU, IT's MINE!"

I also noted that the cart was no longer available for assignment to hauling routes; forbidding or marking the cart for dumping had no effect.
2019-11-17 18:25   
This bug has reappeared in 44.12. Observing a dwarf with a preference for coins has picked up a stack of coins and will never put it down.

When viewing the stack of coins item screen, it lists Owner: 'dwarfname' on the second line under the weight and value entries.
2019-11-24 03:01   
A reproduction of this bug i believe i found in 44.12 at the time with 0010832 where a dwarf picked up wood arrows in a decoration of a preference brought by elves of a type they liked (i would assume to take to stockpile), then stored it in their room.

They still own the arrows actively in the save though its not assigned to them as a civilian in a identical fashion to @gchristopher. They had a room and container to use but chose not to store it, instead laying it out on the floor despite boxes supposedly being able to store arrows in past versions.

Save can be found on the attached issue report.