Dwarf Fortress Bug Tracker - Dwarf Fortress
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0008400Dwarf FortressDwarf Mode -- Jobs, Generalpublic2014-10-04 07:152019-03-09 08:11
normalminorhave not tried
0008400: Removing natural upwards ramps from icy brook floor produced empty tiles
I was digging out the ice from a section of a frozen river (actually, one deeper than original river). Channeling, removing ramps, etc. Two tiles where generated that have no description but are counted as 'inside'. The tile one z-level up from them is 'outside' and open space.
Load save file. Look at floor of river near left side of map.
Save file to follow.
No tags attached.
has duplicate 0010197resolved Loci Building a construction over the river floor, then deconstructing it, causes the river floor to disappear. 
has duplicate 0009715resolved Loci Removing "unusable glacial upward slopes" leaves permanently unpassable, undiggable tiles 
has duplicate 0010746resolved Loci Attempting to remove river tiles during winter via ramps can result in "empty" tiles which cannot be built on or moved through. 
child of 0001981acknowledged Loci Constructing wall/floor over ice ramp/stairs, followed by removing ramp/stairs, creates a "void tile" 
Issue History
2014-10-04 07:15ptb_ptbNew Issue
2014-10-04 07:27ptb_ptbNote Added: 0030525
2014-10-04 08:57FallenAngelNote Added: 0030528
2014-10-04 08:57FallenAngelIssue Monitored: FallenAngel
2014-10-04 11:09Rafal99Note Added: 0030530
2014-10-04 11:10Rafal99Note Edited: 0030530bug_revision_view_page.php?bugnote_id=0030530#r11959
2014-10-04 11:16ptb_ptbNote Added: 0030531
2014-10-04 11:19ptb_ptbNote Added: 0030532
2014-12-01 03:16ptb_ptbNote Added: 0031234
2019-03-09 08:03LociRelationship addedchild of 0001981
2019-03-09 08:05LociRelationship addedhas duplicate 0010197
2019-03-09 08:05LociIssue Monitored: Huntthetroll
2019-03-09 08:05LociAssigned To => Loci
2019-03-09 08:05LociStatusnew => acknowledged
2019-03-09 08:07LociRelationship addedhas duplicate 0009715
2019-03-09 08:08LociRelationship addedhas duplicate 0010746
2019-03-09 08:11LociNote Added: 0039276

2014-10-04 07:27   
Save file

http://dffd.wimbli.com/file.php?id=9855 [^]
2014-10-04 08:57   
I've seen this at least once before. I think.
Dunno where, but this sounds eerily familiar, from 0.34.11.
Might've been during my turn at Demongate.
Either way, you're not the only one.
Going to monitor this.
2014-10-04 11:09   
(edited on: 2014-10-04 11:10)
This sounds quite like 0001981.

2014-10-04 11:16   
Better save.

http://dffd.wimbli.com/file.php?id=9856 [^]

The ramps are marked to be removed. As soon as you unpause the save a dwarf or two will run over there and uncover the mystery holes.
2014-10-04 11:19   

You're right, it does. I don't think any construction was involved in the recent past in this one. Possibly before water froze to make the ice that I turned into ramps then removed.
2014-12-01 03:16   
This still occurs in DF 0.40.19
2019-03-09 08:11   
v0.44.09: fishsicles provided a save and scenario in 0010746:

http://dffd.bay12games.com/file.php?id=13724 [^]

"I believe the bugged tiles result from ramps which formed through this process:

1.) During a previous winter, build a constructed floor over an ice tile.
2.) Remove this floor. This results in a permanent ice tile rather than the soil tile, I don't know if this is intended.
3.) Let water return to this tile and flow over it, freezing into an ice wall the next winter.
4.) Dig a ramp into the ice wall.
5.) Remove the ramp.

This produces the "empty" tile. The ramps which are eligible to reproduce the bug immediately in the save are on the left side of the excavated riverbed."