v.out.ogr: segfault with -n

[neteler]

At time -n crashes the command (tested also in G74 and later):

GRASS 7.7.svn (nc_spm_08):~ > v.out.ogr in=zipcodes_wake type=area out=filename.shp format=ESRI_Shapefile  -n
Segmentation fault (core dumped)

Debugging with user data (from ML):

GRASS 7.4.3svn (test_loc_25832):~/grassdata > gdb v.out.ogr
GNU gdb (GDB) Fedora 8.2-5.fc29
Copyright (C) 2018 Free Software Foundation, Inc.
...
Reading symbols from v.out.ogr...done.
(gdb) r in=cur_feature type=area out=filename.shp format=ESRI_Shapefile output_layer=gebiet -n
Starting program: /home/mneteler/software/grass74/dist.x86_64-pc-linux-gnu/bin/v.out.ogr in=cur_feature type=area out=filename.shp format=ESRI_Shapefile output_layer=gebiet -n
...
Program received signal SIGSEGV, Segmentation fault.
Vect_get_num_dblinks (Map=0x7fffffffbb30) at level_two.c:166
166        return (Map->dblnk->n_fields);

i.e., lib/vector/Vlib/level_two.c

Debugging in trunk with North Carolina dataset:

GRASS 7.7.svn (nc_spm_08):~ > gdb v.out.ogr
GNU gdb (GDB) Fedora 8.2-5.fc29
Copyright (C) 2018 Free Software Foundation, Inc.
...
(gdb) r in=zipcodes_wake type=area out=filename.shp format=ESRI_Shapefile  -n

(gdb) bt
#0  0x00007ffff7f7cdb4 in Vect_get_num_dblinks () from /home/mneteler/software/grass77/dist.x86_64-pc-linux-gnu/lib/libgrass_vector.7.7.svn.so
#1  0x00007ffff7f72d04 in Vect_get_field_number () from /home/mneteler/software/grass77/dist.x86_64-pc-linux-gnu/lib/libgrass_vector.7.7.svn.so
#2  0x0000000000404cfe in main ()

[mmetz]

In 73817:

v.out.ogr: fix #3714, segfault with -n, fix indentation

[mmetz]

In 73818:

v.out.ogr: fix #3714, segfault with -n (backport trunk r73817)

[mmetz]

In 73819:

v.out.ogr: fix #3714, segfault with -n (backport trunk r73817)

[mmetz]

Replying to neteler:

At time -n crashes the command (tested also in G74 and later):

GRASS 7.7.svn (nc_spm_08):~ > v.out.ogr in=zipcodes_wake type=area out=filename.shp format=ESRI_Shapefile  -n
Segmentation fault (core dumped)

Note that the example is wrong because output must be a OGR datasource, not a OGR layer, and filename.shp is a OGR layer. You can specify a OGR layer name with output_layer.