Dwarf Fortress Bug Tracker - Dwarf Fortress
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0006704Dwarf FortressCave-inspublic2014-07-08 12:592014-12-09 03:22
Toady One 
PCWindows 7 64-bit
0006704: Already-felled trees "collapse" when mining under their former roots
Usually happens a while after I cut down trees. I get the message "Something has collapsed on the surface" but when I zoom to the location there is absolutely nothing there. Tested on 3 different forts with different types of trees.
Cut down a tree in Fortress mode and wait. It happens at random intervals, and not on all of the trees.
cave-in, tree
related to 0007277acknowledged Dwarfu Cave-ins that happened re-happens again every loading on first tick 
related to 0007533resolved Toady One Phantom "Something has collapsed on the surface" reports, related to tree growth/chopping 
has duplicate 0006828resolved Footkerchief Random message something has collapsed on the surface pauses the game 
has duplicate 0007053resolved Footkerchief every few months a section of the cavern collapses. 
has duplicate 0007563resolved Dwarfu *Something has Collapsed on the Surface* 
has duplicate 0007584resolved Footkerchief Furrowing ground around roots can trigger a cave-in 
has duplicate 0007697resolved Footkerchief Collapsing trees remove floors 
has duplicate 0007734resolved Dwarfu Collapsing trees channel holes in multiple z levels. 
related to 0006829resolved Dwarfu Collapse of trees during forest fire causes annoying pausing and recentering. (Not a bug, just extremely annoying.) 
related to 0001510needs feedback Footkerchief Floating creatures stuck in projectile status 
related to 0006643confirmed Footkerchief Lower tree trunks dont burn properly 
Issue History
2014-07-08 12:59sepehrnoorNew Issue
2014-07-08 15:43rhoramaNote Added: 0025167
2014-07-08 15:43rhoramaTag Attached: cave-in
2014-07-08 15:43rhoramaTag Attached: tree
2014-07-08 15:43rhoramaTag Attached: 40.01
2014-07-08 16:24psioryxNote Added: 0025175
2014-07-08 17:36awdixonNote Added: 0025191
2014-07-09 08:46FootkerchiefRelationship addedhas duplicate 0006828
2014-07-09 08:46FootkerchiefRelationship addedrelated to 0006829
2014-07-11 07:33FootkerchiefRelationship addedhas duplicate 0007053
2014-07-11 10:23JoeJoeNote Added: 0025787
2014-07-11 10:23JoeJoeNote Edited: 0025787bug_revision_view_page.php?bugnote_id=0025787#r9603
2014-07-11 16:16FirehoundNote Added: 0025874
2014-07-14 11:09FootkerchiefRelationship addedrelated to 0007277
2014-07-14 11:21FootkerchiefRelationship addedhas duplicate 0007250
2014-07-15 08:22Dame de la LicorneNote Added: 0026478
2014-07-15 08:23Dame de la LicorneNote Edited: 0026478bug_revision_view_page.php?bugnote_id=0026478#r9860
2014-07-15 08:23Dame de la LicorneNote Edited: 0026478bug_revision_view_page.php?bugnote_id=0026478#r9861
2014-07-15 11:37FootkerchiefNote Added: 0026513
2014-07-15 12:32ArmokGoBNote Added: 0026519
2014-07-15 12:33ArmokGoBNote Edited: 0026519bug_revision_view_page.php?bugnote_id=0026519#r9874
2014-07-15 15:05Dame de la LicorneNote Added: 0026540
2014-07-15 15:12Dame de la LicorneNote Edited: 0026540bug_revision_view_page.php?bugnote_id=0026540#r9878
2014-07-15 15:18FootkerchiefSummaryRandom cave-in messages on the surface => Already-felled trees "collapse" when mining under their former roots
2014-07-15 15:37Dame de la LicorneNote Edited: 0026540bug_revision_view_page.php?bugnote_id=0026540#r9881
2014-07-15 20:44Dame de la LicorneNote Edited: 0026540bug_revision_view_page.php?bugnote_id=0026540#r9904
2014-07-21 07:11FootkerchiefRelationship addedhas duplicate 0007533
2014-07-21 12:55FootkerchiefRelationship addedrelated to 0007544
2014-07-22 12:21DwarfuRelationship addedhas duplicate 0007563
2014-07-22 12:48TalvienoNote Added: 0027238
2014-07-22 12:48TalvienoNote Edited: 0027238bug_revision_view_page.php?bugnote_id=0027238#r10199
2014-07-23 07:00FootkerchiefRelationship addedhas duplicate 0007584
2014-07-23 18:16FootkerchiefRelationship deletedhas duplicate 0007533
2014-07-25 02:30RedDwarfStepperIssue Monitored: RedDwarfStepper
2014-07-25 12:16FootkerchiefRelationship deletedrelated to 0007544
2014-07-25 12:17FootkerchiefRelationship addedrelated to 0007533
2014-07-25 12:22Dame de la LicorneNote Added: 0027524
2014-07-25 12:23Dame de la LicorneNote Edited: 0027524bug_revision_view_page.php?bugnote_id=0027524#r10370
2014-07-25 12:24Dame de la LicorneIssue Monitored: Dame de la Licorne
2014-07-28 11:35TarasqueIssue Monitored: Tarasque
2014-07-28 11:35TarasqueIssue End Monitor: Tarasque
2014-07-28 11:45TarasqueNote Added: 0027794
2014-07-28 12:14TarasqueNote Edited: 0027794bug_revision_view_page.php?bugnote_id=0027794#r10495
2014-07-28 14:59FootkerchiefRelationship addedhas duplicate 0007697
2014-08-01 08:32NevenrialIssue Monitored: Nevenrial
2014-08-05 06:09lethosorTag Detached: 40.01
2014-08-08 09:12FootkerchiefAssigned To => Footkerchief
2014-08-08 09:12FootkerchiefStatusnew => confirmed
2014-08-15 06:33FootkerchiefRelationship deletedhas duplicate 0007250
2014-08-19 06:37FootkerchiefRelationship addedrelated to 0001510
2014-08-21 16:00FootkerchiefRelationship addedrelated to 0006643
2014-08-25 08:13lethosorRelationship addedhas duplicate 0007734
2014-09-12 15:13Dame de la LicorneNote Added: 0030145
2014-09-12 15:14Dame de la LicorneNote Edited: 0030145bug_revision_view_page.php?bugnote_id=0030145#r11762
2014-11-03 09:12Toady OneStatusconfirmed => resolved
2014-11-03 09:12Toady OneResolutionopen => fixed
2014-11-03 09:12Toady OneAssigned ToFootkerchief => Toady One
2014-12-09 03:22Dame de la LicorneIssue End Monitor: Dame de la Licorne

2014-07-08 15:43   
Can confirm. When it happens, there appear to be 1x1 blocks of earth suspended in the air after a tree is chopped. I don't know why they are there, but they appear to be supported by the tree.
2014-07-08 16:24   
Another confirm. Additionally zooming to the announcement for me takes me to mid air (1 z above ground) and I have absolutely nothing around there above or on ground afterwards.
2014-07-08 17:36   
Played all of two minutes on my first world in .40.01 and I got this message three times with the same circumstances. Agree that it's related to trees, but I can't tell what is "caving in." No dust either.
2014-07-11 10:23   
Assuming this is the same as http://www.bay12games.com/dwarves/mantisbt/view.php?id=7053 [^] , here's a save where a random cave-in occurs one step after loading the game: http://dffd.wimbli.com/file.php?id=8873 [^]

2014-07-11 16:16   
I have encountered a similar case. Occaisionally logs drop. Usually not though.
Dame de la Licorne   
2014-07-15 08:22   
(edited on: 2014-07-15 08:23)
I just got this message when I mined out a root tile under a still-standing tree. The tree vanished, no logs appeared, and all of the tiles that had been marked as root tiles for that tree turned into normal soil wall tiles.

I'm assuming that mining out a single root tile is causing the attached tree to "cave in".

Were any of you all mining on the top-most underground z-level?

2014-07-15 11:37   
Dame de la Licorne, that sounds like 0006749.
2014-07-15 12:32   
(edited on: 2014-07-15 12:33)
I've done extensive burning in arena mode to find that that sometimes there actually is a 1x1 cave in. Punched holes through the arena rock.

Dame de la Licorne   
2014-07-15 15:05   
(edited on: 2014-07-15 20:44)
OK, ran into this bug again, this time doing the following:

1) Run into tree roots, remove designation (did not dig out any root tiles).
2) Designate tree for chopping, woodcutter does his job.
3) Mine out the now-soil tile immediately under where the tree trunk had been.
4) "Something has collapsed on the surface" + zoom to tile where the tree trunk used to be.

So I *think* the bug is due to previously existing + removed tree trunks "collapsing". Maybe the memory isn't being cleared/reset properly when the tree is cut down?

Also, if the memory is the problem, it may not matter what the tile is immediately under the original tree trunk, whether roots or a soil toil, either way we end up with the "collapsed" message. So fixing one problem may fix a couple of bugs if they all have the same root cause (and judging by the symptoms, that is a distinct possibility).

Edit: Sometimes mining a tile not underneath the missing trunk will still cause the message to occur, but the tile you zoom to is always beneath the felled tree's canopy.

2014-07-22 12:48   
It may not be directly underneath the tile, either. I haven't dug underneath tree roots at all, and I'm getting spammed with it.

It may potentially be mining under that x-y coordinate. Not sure, though.


Dame de la Licorne   
2014-07-25 12:22   
(edited on: 2014-07-25 12:23)
It seems now that this may be a straight-out duplicate of 0007533, given the nature of the comments over there and the ones here.

2014-07-28 11:45   
(edited on: 2014-07-28 12:14)
I've just had a collapse which looks like it was due to the tree maturing from being a sapling. I had cleared out a largish area around the wooden walls, and some trees have grown back in the zone. The maturing appears to have either lifted some soil with it, or the soil has been displaced by the roots.

http://dffd.wimbli.com/file.php?id=9188 [^]

Dame de la Licorne   
2014-09-12 15:13   
(edited on: 2014-09-12 15:14)
I think this bug has been fixed, since all of the collapses that I'm seeing now seem to related to some sort of growth (sapling -> tree, small tree -> bigger tree, etc.). At any rate, I haven't seen any phantom collapses in the last several versions that resulted directly from mining activity.