[GRASS-dev] Re: [GRASS GIS] #50: g.copy segfaults (debian.gfoss.it package) [and latest SVN]

[GRASS GIS]

#50: g.copy segfaults (debian.gfoss.it package) [and latest SVN]
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  Reporter:  steko    |       Owner:  grass-dev at lists.osgeo.org
      Type:  defect   |      Status:  new                      
  Priority:  major    |   Milestone:  6.4.0                    
 Component:  default  |     Version:  6.3.0 RCs                
Resolution:           |    Keywords:  g.copy                   
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Comment (by glynn):

 Replying to [comment:5 dylan]:
 > I have attached two strace logs, one from the working version of g.copy
 (-O0), and one from the non-working version (-O1).

 strace doesn't provide enough detail for this kind of problem. All that
 can be deduced from the backtraces is that the segfault occurs sometime
 after the "cell" files are closed (recursive_copy(),
 general/manage/lib/do_copy.c:152) but before the access() test for whether
 the cellhd file exists (G__make_mapset_element(), lib/gis/mapset_msc.c:60,
 called from do_copy(), general/manage/lib/do_copy.c:42).

 AFAICT, the segfault could be occurring in recursive_copy(), G_verbose(),
 G__make_mapset_element() or do_copy().

 A gdb C backtrace would be more useful, even if it isn't enough to
 pinpoint the problem. A C backtrace will still report the correct
 function; it just won't necessarily report the correct line number, or the
 actual state of any variables (it *might* get this information right, but
 as you can't tell whether the information is accurate, it doesn't
 necessarily help).

 It might be useful to add some printf() statements to do_copy() to print
 out variable values. OTOH, adding those statements might just make the bug
 disappear.

 Also, it would be useful to know whether the problem occurs when lib/gis
 is compiled with optimisation or when general/manage is compiled with
 optimisation.

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/50#comment:6>
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