[GRASS-dev] [GRASS GIS] #417: NVIZ Clear Scaled difference causes segfault

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1

#417: NVIZ Clear Scaled difference causes segfault
-------------------------+--------------------------------------------------
Reporter: marisn | Owner: grass-dev@lists.osgeo.org
     Type: defect | Status: new
Priority: minor | Milestone: 6.4.0
Component: NVIZ | Version: 6.4.0 RCs
Keywords: | Platform: Linux
      Cpu: Unspecified |
-------------------------+--------------------------------------------------
Start nviz -> Visualize -> Scaled Difference -> Clear -> KaBOOM!
{{{
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb70ddb50 (LWP 19340)]
0xb7f3900b in gs_get_att_typbuff (gs=0x0, desc=1, to_write=0) at gs.c:686
686 G_debug(5, "gs_get_att_typbuff(): id=%d desc=%d to_write=%d",
(gdb) bt
#0 0xb7f3900b in gs_get_att_typbuff (gs=0x0, desc=1, to_write=0) at
gs.c:686
#1 0xb7f3af03 in gsdiff_set_SDref (gsref=0x0) at gsdiff.c:67
#2 0xb7f33b1e in GS_unset_SDsurf () at GS2.c:1016
#3 0x0805b855 in Nunset_SDsurf_cmd (data=0x8071ce0, interp=0x8077d50,
argc=1, argv=0xbff9b4cc) at misc.c:58
#4 0xb7c55b24 in TclInvokeStringCommand () from /usr/lib/libtcl8.4.so
#5 0xb7c57566 in TclEvalObjvInternal () from /usr/lib/libtcl8.4.so
#6 0xb7c81578 in ?? () from /usr/lib/libtcl8.4.so
#7 0x08077d50 in ?? ()
#8 0x00000001 in ?? ()
#9 0x08079b58 in ?? ()
#10 0x00000000 in ?? ()
}}}

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Ticket URL: <http://trac.osgeo.org/grass/ticket/417&gt;
GRASS GIS <http://grass.osgeo.org>

2

#417: NVIZ Clear Scaled difference causes segfault
---------------------+------------------------------------------------------
  Reporter: marisn | Owner: grass-dev@lists.osgeo.org
      Type: defect | Status: new
  Priority: minor | Milestone: 6.4.0
Component: NVIZ | Version: 6.4.0 RCs
Resolution: | Keywords:
  Platform: Linux | Cpu: Unspecified
---------------------+------------------------------------------------------
Comment (by cmbarton):

I have no problem on the Mac with develbranch_6. A Linux or perhaps
particular flavor of Linux issue?

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Ticket URL: <http://trac.osgeo.org/grass/ticket/417#comment:1&gt;
GRASS GIS <http://grass.osgeo.org>

3

#417: NVIZ Clear Scaled difference causes segfault
---------------------+------------------------------------------------------
  Reporter: marisn | Owner: grass-dev@lists.osgeo.org
      Type: defect | Status: new
  Priority: minor | Milestone: 6.4.0
Component: NVIZ | Version: 6.4.0 RCs
Resolution: | Keywords:
  Platform: Linux | Cpu: Unspecified
---------------------+------------------------------------------------------
Comment (by cmbarton):

Found it.

This seems to be a bug in ./nviz/src/misc.c somewhere in lines 48-61 (or
one of the functions called here). I don't know C, and haven't been able
to debug it.

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Ticket URL: <http://trac.osgeo.org/grass/ticket/417#comment:2&gt;
GRASS GIS <http://grass.osgeo.org>