Dwarf Fortress Bug Tracker - Dwarf Fortress
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IDProjectCategoryView StatusDate SubmittedLast Update
0000470Dwarf FortressPathfindingpublic2010-04-05 07:252012-04-02 12:01
Reporterking doom 
Assigned ToFootkerchief 
PrioritynormalSeveritymajorReproducibilityalways
StatusresolvedResolutionunable to reproduce 
PlatformOSOS Version
Product Version0.31.01 
Target VersionFixed in Version 
Summary0000470: Up/down stairs break pathfinding.
DescriptionI had a line of up/down stairs extending down to the bottom of my fort, lowest level was the z level above an underground lake. Because it had an up/down stair, that meant my dwarves using the stairs could see creatures inside the lake, and that sent them off in terror. I built an up stair over the bottom up/down stair, since it was only used to go up and there was no part of my fort below it, hoping this would stop my dwarves looking into the tunnel. Instead, it totally obliterated my fort. Pathfinding died totally, the game dropped to a couple of FPS and the 'dwarf cancels task cannot find path' spam became almost infinite.
Steps To Reproducedig a series of up/down stairs, so that dwarves can use them to move between z levels. make a room at the bottom z level and put something in there so your dwarves have a reason to go there, then replace the bottom up/down stair with an up stair. Dwarves trying to use the staircase will generate massive pathfinding spam, game dies a slow death, etcetera.
Additional InformationCannot be replicated with previous version of DF.
Tagspathfinding, stairs
Relationships
parent of 0001566resolved Footkerchief Constructed Up-Down Stairs over Natural Downstairs render "Down" an Invalid Path 
has duplicate 0004728resolved Dwarfu Dwarfs refusing to bring stone outside 
related to 0001357resolved Dwarfu Arsenal dwarf spams "cancels Upgrade Squad Equipment: Need office" if there's no path to office. 
related to 0004420new  Dwarf refuses to dig 
Attached Files
Issue History
Date ModifiedUsernameFieldChange
2010-04-05 07:25king doomNew Issue
2010-04-05 09:08FootkerchiefNote Added: 0001091
2010-04-05 09:08FootkerchiefIssue Monitored: Footkerchief
2010-04-05 09:12axusNote Added: 0001093
2010-04-05 10:44QloosTag Attached: pathfinding
2010-04-05 10:44QloosTag Attached: stairs
2010-04-05 11:13WirritNote Added: 0001122
2010-04-26 17:01FootkerchiefNote Added: 0005205
2010-04-27 03:31king doomNote Added: 0005325
2010-07-22 10:30DwarfuRelationship addedrelated to 0001357
2011-07-02 23:38DwarfuRelationship addedparent of 0001566
2011-07-02 23:46DwarfuRelationship addedhas duplicate 0004728
2011-07-09 14:59DwarfuRelationship addedrelated to 0004420
2012-04-02 12:01FootkerchiefStatusnew => resolved
2012-04-02 12:01FootkerchiefResolutionopen => unable to reproduce
2012-04-02 12:01FootkerchiefAssigned To => Footkerchief

Notes
(0001091)
Footkerchief   
2010-04-05 09:08   
Does this bug survive through a save/load? If so, it may be helpful to upload a save. http://dffd.wimbli.com/ [^]
(0001093)
axus   
2010-04-05 09:12   
I've noticed that my pathfinding spam goes away after some time has passed. I don't use the combined up/down stair though. I'm getting the feeling that new constructions aren't passable for a while. Also, I feel like my dwarves are blocking each other sometimes. On thing I've done with stockpiles is get rid of any "landlocked" tiles. I'll draw a big rectangle, then use "remove stockpile" on it until I have a bunch of 2xN strips.
(0001122)
Wirrit   
2010-04-05 11:13   
More info available on bug 0000018: http://www.bay12games.com/dwarves/mantisbt/view.php?id=18 [^]
(0005205)
Footkerchief   
2010-04-26 17:01   
Is this bug still present in 31.03? If it only happens in the bottom cavern layer (adamantine, magma sea, etc.), then it's 0001319.
(0005325)
king doom   
2010-04-27 03:31   
Haven't tried to replicate this one in 31.03, but the problem was with a building in a stone layer and not in/near the magma sea anyway.