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IDProjectCategoryView StatusDate SubmittedLast Update
0006704Dwarf FortressCave-inspublic2014-07-08 12:592014-12-09 03:22
Reportersepehrnoor Assigned ToToady One  
PrioritynormalSeverityminorReproducibilityN/A
Status resolvedResolutionfixed 
PlatformPCOSWindows 7 64-bit 
Product Version0.40.01 
Summary0006704: Already-felled trees "collapse" when mining under their former roots
DescriptionUsually 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.
Steps To ReproduceCut down a tree in Fortress mode and wait. It happens at random intervals, and not on all of the trees.
Tagscave-in, tree

Relationships

related to 0007277 acknowledgeduser11 Cave-ins that happened re-happens again every loading on first tick 
related to 0007533 resolvedToady One Phantom "Something has collapsed on the surface" reports, related to tree growth/chopping 
has duplicate 0006828 resolveduser6 Random message something has collapsed on the surface pauses the game 
has duplicate 0007053 resolveduser6 every few months a section of the cavern collapses. 
has duplicate 0007563 resolveduser11 *Something has Collapsed on the Surface* 
has duplicate 0007584 resolveduser6 Furrowing ground around roots can trigger a cave-in 
has duplicate 0007697 resolveduser6 Collapsing trees remove floors 
has duplicate 0007734 resolveduser11 Collapsing trees channel holes in multiple z levels. 
related to 0006829 resolveduser11 Collapse of trees during forest fire causes annoying pausing and recentering. (Not a bug, just extremely annoying.) 
related to 0001510 feedbackuser6 Floating creatures stuck in projectile status 
related to 0006643 confirmeduser6 Lower tree trunks dont burn properly 

Activities

rhorama

2014-07-08 15:43

reporter   ~0025167

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.

psioryx

2014-07-08 16:24

reporter   ~0025175

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.

awdixon

2014-07-08 17:36

reporter   ~0025191

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.

JoeJoe

2014-07-11 10:23

reporter   ~0025787

Last edited: 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

Firehound

2014-07-11 16:16

reporter   ~0025874

I have encountered a similar case. Occaisionally logs drop. Usually not though.

Dame de la Licorne

2014-07-15 08:22

reporter   ~0026478

Last edited: 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?

user6

2014-07-15 11:37

  ~0026513

Dame de la Licorne, that sounds like 0006749.

ArmokGoB

2014-07-15 12:32

reporter   ~0026519

Last edited: 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

reporter   ~0026540

Last edited: 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.

Talvieno

2014-07-22 12:48

manager   ~0027238

Last edited: 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.

40.04.

Dame de la Licorne

2014-07-25 12:22

reporter   ~0027524

Last edited: 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.

Tarasque

2014-07-28 11:45

reporter   ~0027794

Last edited: 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

reporter   ~0030145

Last edited: 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.

Issue History

Date Modified Username Field Change
2014-07-08 12:59 sepehrnoor New Issue
2014-07-08 15:43 rhorama Note Added: 0025167
2014-07-08 15:43 rhorama Tag Attached: cave-in
2014-07-08 15:43 rhorama Tag Attached: tree
2014-07-08 15:43 rhorama Tag Attached: 40.01
2014-07-08 16:24 psioryx Note Added: 0025175
2014-07-08 17:36 awdixon Note Added: 0025191
2014-07-09 08:46 user6 Relationship added has duplicate 0006828
2014-07-09 08:46 user6 Relationship added related to 0006829
2014-07-11 07:33 user6 Relationship added has duplicate 0007053
2014-07-11 10:23 JoeJoe Note Added: 0025787
2014-07-11 10:23 JoeJoe Note Edited: 0025787
2014-07-11 16:16 Firehound Note Added: 0025874
2014-07-14 11:09 user6 Relationship added related to 0007277
2014-07-14 11:21 user6 Relationship added has duplicate 0007250
2014-07-15 08:22 Dame de la Licorne Note Added: 0026478
2014-07-15 08:23 Dame de la Licorne Note Edited: 0026478
2014-07-15 08:23 Dame de la Licorne Note Edited: 0026478
2014-07-15 11:37 user6 Note Added: 0026513
2014-07-15 12:32 ArmokGoB Note Added: 0026519
2014-07-15 12:33 ArmokGoB Note Edited: 0026519
2014-07-15 15:05 Dame de la Licorne Note Added: 0026540
2014-07-15 15:12 Dame de la Licorne Note Edited: 0026540
2014-07-15 15:18 user6 Summary Random cave-in messages on the surface => Already-felled trees "collapse" when mining under their former roots
2014-07-15 15:37 Dame de la Licorne Note Edited: 0026540
2014-07-15 20:44 Dame de la Licorne Note Edited: 0026540
2014-07-21 07:11 user6 Relationship added has duplicate 0007533
2014-07-21 12:55 user6 Relationship added related to 0007544
2014-07-22 12:21 user11 Relationship added has duplicate 0007563
2014-07-22 12:48 Talvieno Note Added: 0027238
2014-07-22 12:48 Talvieno Note Edited: 0027238
2014-07-23 07:00 user6 Relationship added has duplicate 0007584
2014-07-23 18:16 user6 Relationship deleted has duplicate 0007533
2014-07-25 12:16 user6 Relationship deleted related to 0007544
2014-07-25 12:17 user6 Relationship added related to 0007533
2014-07-25 12:22 Dame de la Licorne Note Added: 0027524
2014-07-25 12:23 Dame de la Licorne Note Edited: 0027524
2014-07-28 11:45 Tarasque Note Added: 0027794
2014-07-28 12:14 Tarasque Note Edited: 0027794
2014-07-28 14:59 user6 Relationship added has duplicate 0007697
2014-08-05 06:09 lethosor Tag Detached: 40.01
2014-08-08 09:12 user6 Assigned To => user6
2014-08-08 09:12 user6 Status new => confirmed
2014-08-15 06:33 user6 Relationship deleted has duplicate 0007250
2014-08-19 06:37 user6 Relationship added related to 0001510
2014-08-21 16:00 user6 Relationship added related to 0006643
2014-08-25 08:13 lethosor Relationship added has duplicate 0007734
2014-09-12 15:13 Dame de la Licorne Note Added: 0030145
2014-09-12 15:14 Dame de la Licorne Note Edited: 0030145
2014-11-03 09:12 Toady One Status confirmed => resolved
2014-11-03 09:12 Toady One Resolution open => fixed
2014-11-03 09:12 Toady One Assigned To user6 => Toady One