[GRASS-dev] [GRASS GIS] #2814: digitizer crashes, leaves vector broken

[GRASS GIS]

#2814: digitizer crashes, leaves vector broken
--------------------------+-------------------------------
  Reporter:  harrikoo     |      Owner:  grass-dev@…
      Type:  defect       |     Status:  new
  Priority:  blocker      |  Milestone:  7.0.3
 Component:  wxGUI        |    Version:  7.0.2
Resolution:               |   Keywords:  digitizer, vector
       CPU:  Unspecified  |   Platform:  Unspecified
--------------------------+-------------------------------
Changes (by harrikoo):

 * priority:  critical => blocker


Comment:

 Now it just happened again! I was drawing a test vector and crossing lines
 and boundaries, breaking them and merging them, and then in the end,
 deleting extra lines; immediately after the deletion of one line (select
 with left, confirm with right) the digitizer crashed. This was not the
 first line I deleted, perhaps the 20th, so it was something particular
 about that line.

 V.build reports errors in the file:

 {{{
 GRASS 7.0.2RC2 (Nemi):~/grass/Nemi/terracewall > v.build test
 WARNING: Coor file of vector map <test at terracewall> is larger than it
          should be (5326 bytes excess)
 Building topology for vector map <test at terracewall>...
 Registering primitives...
 35 primitives registered
 80 vertices registered
 Building areas...
  100%
 4 areas built
 2 isles built
 Attaching islands...
  100%
 Attaching centroids...
  100%
 Number of nodes: 25
 Number of primitives: 35
 Number of points: 0
 Number of lines: 8
 Number of boundaries: 20
 Number of centroids: 7
 Number of areas: 4
 Number of isles: 2
 WARNING: Number of centroids exceeds number of areas: 7 > 4
 WARNING: Number of incorrect boundaries: 14
 WARNING: Number of centroids outside area: 3
 WARNING: Number of duplicate centroids: 1
 }}}

 Especially the number of incorrect boundaries is way too high. Otherwise
 the figures seem ok.

 The line I was deleting was at one end sharing a vertex with an area.

 And then, `g.gui.vdigit` crashes with this message:

 {{{
 Coor file of vector map <test at terracewall> is larger than it should be
 (5326 bytes excess)
 Current region rows: 300, cols: 450
 G_malloc: unable to allocate 18446744073709551608 bytes of memory at
 lib/vector/vedit/render.c:312
 }}}

 Looking at the file with `v.info` shows wrong extents:

 {{{
 WARNING: Coor file of vector map <test at terracewall> is larger than it
          should be (5326 bytes excess)
 +----------------------------------------------------------------------------+
  | Name:            test
 |
  | Mapset:          terracewall
 |
  | Location:        Nemi
 |
  | Database:        /home/harri/grass
 |
  | Title:
 |
  | Map scale:       1:1
 |
  | Name of creator: harri
 |
  | Organization:
 |
  | Source date:     Thu Jan  7 20:58:54 2016
 |
  | Timestamp (first layer): none
 |
 |----------------------------------------------------------------------------|
  | Map format:      native
 |
 |----------------------------------------------------------------------------|
  |   Type of map: vector (level: 1)
 |
  |
 |
  |   Number of points:       0               Number of centroids:  7
 |
  |   Number of lines:        8               Number of boundaries: 20
 |
  |   Number of areas:        0               Number of islands:    0
 |
  |
 |
  |   Map is 3D:              No
 |
  |   Number of dblinks:      0
 |
  |
 |
  |   Projection: Oblique Mercator
 |
  |
 |
  |               N:     5075.53088803    S:                 0
 |
  |               E:     5174.83237245    W:                 0
 |
  |
 |
  |   Digitization threshold: 0
 |
  |   Comment:
 |
  |
 |
 +----------------------------------------------------------------------------+
 }}}
 I have not drawn anything near (0,0), all the coordinates should be well
 above (4800,4800).

 I can try to run some debugging commands, if someone just lets me know a
 suitable command line...

--
Ticket URL: <https://trac.osgeo.org/grass/ticket/2814#comment:18>
GRASS GIS <https://grass.osgeo.org>