valgrind ../../bin/g-iges -f -o iges.m35.r516.iges iges.m35.g r516
==2827298== Memcheck, a memory error detector
==2827298== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==2827298== Using Valgrind-3.15.0 and LibVEX; rerun with -h for copyright info
==2827298== Command: ../../bin/g-iges -f -o iges.m35.r516.iges iges.m35.g r516
==2827298==
BRL-CAD Release 7.32.1  BRL-CAD to IGES Translator
    Fri, 05 Feb 2021 15:36:57 UTC, Compilation 3
    cyapp@ubuntu2019
Please direct bug reports to <bugs@brlcad.org>

 {s516} - {s517}
 {(s516 - s517)} - {s512}
r516
==2827298== Invalid read of size 4
==2827298==    at 0x48DD8FB: db_free_tree (db_tree.c:1357)
==2827298==    by 0x10D3E6: do_nmg_region_end (g-iges.c:647)
==2827298==    by 0x48DF875: _db_walk_dispatcher (db_tree.c:2016)
==2827298==    by 0x53D61E2: bu_parallel (parallel.c:574)
==2827298==    by 0x48E02FD: db_walk_tree (db_tree.c:2199)
==2827298==    by 0x10C312: main (g-iges.c:343)
==2827298==  Address 0x8a6a3d0 is 0 bytes inside a block of size 72 free'd
==2827298==    at 0x483CA3F: free (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==2827298==    by 0x53B209C: bu_free (malloc.c:220)
==2827298==    by 0x4F15A78: nmg_free (alloc.cpp:102)
==2827298==    by 0x4FC31E3: nmg_kr (mk.c:1619)
==2827298==    by 0x10D29A: do_nmg_region_end (g-iges.c:617)
==2827298==    by 0x48DF875: _db_walk_dispatcher (db_tree.c:2016)
==2827298==    by 0x53D61E2: bu_parallel (parallel.c:574)
==2827298==    by 0x48E02FD: db_walk_tree (db_tree.c:2199)
==2827298==    by 0x10C312: main (g-iges.c:343)
==2827298==  Block was alloc'd at
==2827298==    at 0x483E0F0: memalign (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==2827298==    by 0x483E212: posix_memalign (in /usr/lib/x86_64-linux-gnu/valgrind/vgpreload_memcheck-amd64-linux.so)
==2827298==    by 0x53B1E02: alloc (malloc.c:137)
==2827298==    by 0x53B1F53: bu_calloc (malloc.c:174)
==2827298==    by 0x4F15820: nmg_calloc (alloc.cpp:58)
==2827298==    by 0x4FBB117: nmg_mrsv (mk.c:311)
==2827298==    by 0x4920D20: rt_arb_tess (arb8.c:1522)
==2827298==    by 0x4AE3A87: nmg_booltree_leaf_tess (nmg.c:4522)
==2827298==    by 0x48DCEB3: db_recurse (db_tree.c:1170)
==2827298==    by 0x48DBC31: _db_recurse_subtree (db_tree.c:925)
==2827298==    by 0x48DBF1F: _db_recurse_subtree (db_tree.c:956)
==2827298==    by 0x48DBF1F: _db_recurse_subtree (db_tree.c:956)
==2827298==
Wrote the following numbers and type of entities:
    27 - Line
    11 - Point
    11 - Direction
    1 - Manifold Boundary Representation
    11 - Plane Surface
    1 - Attribute Table Definition
    1 - Property Entity
    1 - Attribute Table Instance
    1 - Vertex List
    1 - Edge List
    11 - Loop
    11 - Face
    1 - Shell
Total of 89 entities written
Tried 1 regions, 1 converted to nmg's successfully.  100%