[Brlcad-tracker] [ brlcad-Bugs-1220146 ] ERROR: NULL functab pointer, file dir.c, line 250

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Bugs item #1220146, was opened at 2005-06-14 02:34
Message generated for change (Comment added) made by johnranderson
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Category: Geometry Editing
Group: other bug / workaround
>Status: Closed
>Resolution: Fixed
Priority: 5
Submitted By: Karel Kulhavy (clock3)
Assigned to: John Anderson (johnranderson)
Summary: ERROR: NULL functab pointer, file dir.c, line 250

Initial Comment:
mged chimney.g
B chimney
and it will crash.
mged --version doesn't work. The version is however not
the newest.

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>Comment By: John Anderson (johnranderson)
Date: 2006-03-22 22:07

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This was caused by a bug in db_recurse() where it would try
to free an rt_db_internal even when there was nothing to
free. The fix was to check that there is actually something
there before freeing. This eliminates the crashing, but the
bad geometry will still not be drawn.

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Comment By: Lee Butler (lbutler)
Date: 2006-01-11 18:25

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Can you still reproduce this error?  With correct geometry?

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Comment By: Sean Morrison (brlcad)
Date: 2005-06-15 08:50

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First off, there is no --version option to mged (or any --long-options).  
Probably the easiest means to determine the version of mged is to run it 
in console-mode: mged -c  For what it's worth, the version is also placed 
into the mged window title.

In general, though, it's even easier to get the version number from rt 
instead of from mged.  If you run just 'rt' with no options, it will output a 
usage statement that includes the version information of all the core 
libraries.

As for the crash bug, it's related to invalid geometry.  I'm unable to 
reproduce the crash itself, but mged is being presented with an arbn that 
is being reported as invalid.  In chimney.g there is a scaling factor over 
an arbn that makes it invalid:

mged> l chimney/bars.r/bar1.c
chimney/bars.r/bar1.c:  --
   u bar1.s
   u head10a.s [-265,0,0]
mged> e bar1.c
bn_mat_ck(head10a.s):  bad matrix, does not preserve axis 
perpendicularity.
  X.Y=0, Y.Z=0, X.Z=-288, s=1
MATRIX bn_mat_ck() bad matrix:
      1.000    0.000    0.000 -265.000
      0.000    1.000    0.000    0.000
   -288.000    0.000    1.000    0.000
      0.000    0.000    0.000    1.000
db_recurse(head10a.s):  matrix does not preserve axis perpendicularity.
MATRIX bad matrix:
      1.000    0.000    0.000 -265.000
      0.000    1.000    0.000    0.000
   -288.000    0.000    1.000    0.000
      0.000    0.000    0.000    1.000

It may or may not be related to the crash, but it's curious to see 
regardless and suspicious.  It's not a fatal error so it should not abort, 
but it is invalid geometry and might be causing system-specific floating 
point effects that provoke the crash.

I imagine if you e up just head10a.s, that it will work, and if you e up 
bar1.c that it will either crash or report the same error.  Try fixing that 
scaling and see if it makes the problem go away.  It will at least narrow 
the problem down so that we might figure out where the crash itself is 
being caused.


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Comment By: Karel Kulhavy (clock3)
Date: 2005-06-15 06:37

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It's 7.2.2

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Comment By: Lee Butler (lbutler)
Date: 2005-06-14 16:37

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When mged starts up it should print a couple of lines indicating the version 
of the libraries it is using.  Could you indicate the output it displays?  One 
easy way to obtain this is with the following:

% mged -c non_existent_file.g

It should report somthing like:
BRL-CAD Release 7.2.1   Geometry Editor (MGED)




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