[Bug] r.fill.dir Segfault/stack overflow with larger datasets

[byteit101]

Describe the bug

Large datasets seem to cause a segfault. Investigating the resulting coredump, the stack trace was 100k lines long:

(gdb) bt
#0  0x0000555c25ff41a6 in recurse_list (flag=flag@entry=117042, cells=cells@entry=0x7fa04fa00010, sz=sz@entry=4252788, start=<optimized out>) at ./raster/r.fill.dir/dopolys.c:26
#1  0x0000555c25ff41b5 in recurse_list (flag=flag@entry=117042, cells=cells@entry=0x7fa04fa00010, sz=sz@entry=4252788, start=<optimized out>) at ./raster/r.fill.dir/dopolys.c:26
#2  0x0000555c25ff41b5 in recurse_list (flag=flag@entry=117042, cells=cells@entry=0x7fa04fa00010, sz=sz@entry=4252788, start=<optimized out>) at ./raster/r.fill.dir/dopolys.c:26
...snip...
#104756 0x0000555c25ff41b5 in recurse_list (flag=flag@entry=117042, cells=cells@entry=0x7fa04fa00010, sz=sz@entry=4252788, start=<optimized out>) at ./raster/r.fill.dir/dopolys.c:26
#104757 0x0000555c25ff41b5 in recurse_list (flag=flag@entry=117042, cells=cells@entry=0x7fa04fa00010, sz=sz@entry=4252788, start=<optimized out>) at ./raster/r.fill.dir/dopolys.c:26
#104758 0x0000555c25ff41b5 in recurse_list (flag=flag@entry=117042, cells=cells@entry=0x7fa04fa00010, sz=sz@entry=4252788, start=<optimized out>) at ./raster/r.fill.dir/dopolys.c:26
#104759 0x0000555c25ff43d9 in dopolys (fd=fd@entry=6, fm=fm@entry=7, nl=nl@entry=11011, ns=ns@entry=14056) at ./raster/r.fill.dir/dopolys.c:81
#104760 0x0000555c25ff399c in main (argc=<optimized out>, argv=<optimized out>) at ./raster/r.fill.dir/main.c:210

Seems that https://trac.osgeo.org/grass/ticket/2742 wasn't actually fixed.

To reproduce

1. Download a large chunk of DEM data. I used https://maps.vcgi.vermont.gov/opendata/clipandzip.html?InputLayerName=IMG_VCGI_LIDARDEM_SP_v3&InputFtype=raster with a chunk about 3/4 the size of the towns in the bottom right. Mine was about 600MB.
2. Extract and import
3. Run r.fill.dir with it
4. See error

I had sufficient memory, I have about 16GB free, which wasn't used when this was running

Expected behavior

No Crash

Screenshots

Importing raster map <rast_667ee69b044a211>...
0..3..6..9..12..15..18..21..24..27..30..33..36..39..42..45..48..51..54..57..60..63..66..69..72..75..78..81..84..87..90..93..96..99..100
Reading input elevation raster map...
0..3..6..9..12..15..18..21..24..27..30..33..36..39..42..45..48..51..54..57..60..63..66..69..72..75..78..81..84..87..90..93..96..99..100
Filling sinks...
Determining flow directions for ambiguous cases...
Segmentation fault (core dumped)

System description

• Operating System: Debian GNU/Linux 12
• GRASS GIS version: 8.4.1 (Debian)

QGIS version	3.22.16-Białowieża - QGIS code branch - Release 3.22
Qt version	5.15.8
Python version	3.11.1
GDAL/OGR version	3.6.2
PROJ version	9.1.1
EPSG Registry database version	v10.076 (2022-08-31)
GEOS version	3.11.1-CAPI-1.17.1
SQLite version	3.40.1
PostgreSQL client version	15.1 (Debian 15.1-1+b1)
SpatiaLite version	5.0.1
QWT version	6.1.4
QScintilla2 version	2.13.3
OS version	Debian GNU/Linux 12 (bookworm)
Active Python plugins
quick_map_services	0.19.29
DEMto3D	3.6
MetaSearch	0.3.5
db_manager	0.1.20
grassprovider	2.12.99
processing	2.12.99
sagaprovider	2.12.99

[marisn]

As there is no link from the Trac to an actual commit, I'd guess it didn't got fixed. Please provide your computational region parameters (g.region -p) to determine how large is large.

[byteit101]

Hmm, I am unsure where or how to use that command, but QGIS's layer properties says:

Total size: 528.95 MB
Width: 14056
Height: 11011
Data type: Float32 - Thirty two bit floating point
GDAL Driver Description: HFA
GDAL Driver Metadata: Erdas Imagine Images (.img)
Dimensions: X: 14056 Y: 11011 Bands: 1
Pixel Size: 0.6999999999484479707,-0.6999999999484491919
Name: NAD83 / Vermont
Units: meters
Method: Transverse Mercator