0006704: Already-felled trees "collapse" when mining under their former roots

(0025167)
rhorama (reporter)
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.

(0025175)
psioryx (reporter)
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.

(0025191)
awdixon (reporter)
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.

(0025787)
JoeJoe (reporter)
2014-07-11 10:23
edited on: 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 [^]

(0025874)
Firehound (reporter)
2014-07-11 16:16

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

(0026478)
Dame de la Licorne (reporter)
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?

(0026513)
Footkerchief (manager)
2014-07-15 11:37

Dame de la Licorne, that sounds like 0006749.

(0026519)
ArmokGoB (reporter)
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.

(0026540)
Dame de la Licorne (reporter)
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.

(0027238)
Talvieno (reporter)
2014-07-22 12:48
edited on: 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.

(0027524)
Dame de la Licorne (reporter)
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.

(0027794)
Tarasque (reporter)
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 [^]

(0030145)
Dame de la Licorne (reporter)
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.

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	Footkerchief	Relationship added	has duplicate 0006828
2014-07-09 08:46	Footkerchief	Relationship added	related to 0006829
2014-07-11 07:33	Footkerchief	Relationship added	has duplicate 0007053
2014-07-11 10:23	JoeJoe	Note Added: 0025787
2014-07-11 10:23	JoeJoe	Note Edited: 0025787	View Revisions
2014-07-11 16:16	Firehound	Note Added: 0025874
2014-07-14 11:09	Footkerchief	Relationship added	related to 0007277
2014-07-14 11:21	Footkerchief	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	View Revisions
2014-07-15 08:23	Dame de la Licorne	Note Edited: 0026478	View Revisions
2014-07-15 11:37	Footkerchief	Note Added: 0026513
2014-07-15 12:32	ArmokGoB	Note Added: 0026519
2014-07-15 12:33	ArmokGoB	Note Edited: 0026519	View Revisions
2014-07-15 15:05	Dame de la Licorne	Note Added: 0026540
2014-07-15 15:12	Dame de la Licorne	Note Edited: 0026540	View Revisions
2014-07-15 15:18	Footkerchief	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	View Revisions
2014-07-15 20:44	Dame de la Licorne	Note Edited: 0026540	View Revisions
2014-07-21 07:11	Footkerchief	Relationship added	has duplicate 0007533
2014-07-21 12:55	Footkerchief	Relationship added	related to 0007544
2014-07-22 12:21	Dwarfu	Relationship added	has duplicate 0007563
2014-07-22 12:48	Talvieno	Note Added: 0027238
2014-07-22 12:48	Talvieno	Note Edited: 0027238	View Revisions
2014-07-23 07:00	Footkerchief	Relationship added	has duplicate 0007584
2014-07-23 18:16	Footkerchief	Relationship deleted	has duplicate 0007533
2014-07-25 02:30	RedDwarfStepper	Issue Monitored: RedDwarfStepper
2014-07-25 12:16	Footkerchief	Relationship deleted	related to 0007544
2014-07-25 12:17	Footkerchief	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	View Revisions
2014-07-25 12:24	Dame de la Licorne	Issue Monitored: Dame de la Licorne
2014-07-28 11:35	Tarasque	Issue Monitored: Tarasque
2014-07-28 11:35	Tarasque	Issue End Monitor: Tarasque
2014-07-28 11:45	Tarasque	Note Added: 0027794
2014-07-28 12:14	Tarasque	Note Edited: 0027794	View Revisions
2014-07-28 14:59	Footkerchief	Relationship added	has duplicate 0007697
2014-08-01 08:32	Nevenrial	Issue Monitored: Nevenrial
2014-08-05 06:09	lethosor	Tag Detached: 40.01
2014-08-08 09:12	Footkerchief	Assigned To	=> Footkerchief
2014-08-08 09:12	Footkerchief	Status	new => confirmed
2014-08-15 06:33	Footkerchief	Relationship deleted	has duplicate 0007250
2014-08-19 06:37	Footkerchief	Relationship added	related to 0001510
2014-08-21 16:00	Footkerchief	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	View Revisions
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	Footkerchief => Toady One
2014-12-09 03:22	Dame de la Licorne	Issue End Monitor: Dame de la Licorne

Notes
(0025167) rhorama (reporter) 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.

(0025175) psioryx (reporter) 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.

(0025191) awdixon (reporter) 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.

(0025787) JoeJoe (reporter) 2014-07-11 10:23 edited on: 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 [^]

(0025874) Firehound (reporter) 2014-07-11 16:16	I have encountered a similar case. Occaisionally logs drop. Usually not though.

(0026478) Dame de la Licorne (reporter) 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?

(0026513) Footkerchief (manager) 2014-07-15 11:37	Dame de la Licorne, that sounds like 0006749.

(0026519) ArmokGoB (reporter) 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.

(0026540) Dame de la Licorne (reporter) 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.

(0027238) Talvieno (reporter) 2014-07-22 12:48 edited on: 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.

(0027524) Dame de la Licorne (reporter) 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.

(0027794) Tarasque (reporter) 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 [^]

(0030145) Dame de la Licorne (reporter) 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.