grdimage crashes when saving cpt is requested via -C...+smy.cpt #8949
Description
grdimage crashes when saving cpt is requested using e.g. -Cgeo+smy.cpt. my.cpt is saved. Request to scale the pallete via +Uk is ignored (-Cgeo+Uk+smy.cpt), see the separate report #8950. The crash is triggered regardless of +Uk.
Manual session cleanup is needed after the crash (gmt clear sessions).
gmt grdimage @earth_relief_10m -Cgeo+Uk+smy.cpt -Vd -R110/155/-45/-10 -JM10c -B -png Australia -Vd
...
grdimage [INFORMATION]: gmt_grd_project: Output grid extrema [-12885.5/1658] exceed extrema of input grid [-6762/1619] due to resampling
grdimage [INFORMATION]: gmt_grd_project: Output grid clipped to input grid extrema
grdimage [DEBUG]: GMT_Destroy_Data: freed memory for a Grid for object 0
grdimage [DEBUG]: gmtlib_unregister_io: Unregistering object no 0 [n_objects = 3]
grdimage [DEBUG]: gmtlib_unregister_io: Object no 0 has non-NULL resource pointer
grdimage [INFORMATION]: Evaluate image pixel colors
grdimage [INFORMATION]: Basic z(x,y) -> color image with no illumination.
grdimage [INFORMATION]: Plotting 24-bit color image
PSL: Too many colors to make colormap - using 24-bit direct color instead.
PSL: DEFLATE compressed 172992 to 96673 bytes (44.1% savings at compression level 5)
grdimage [DEBUG]: Current size of half-baked PS file /home/mkononets/.gmt/sessions/gmt_session.3134949/gmt_0.ps- = 147221.
grdimage [DEBUG]: GMT_Destroy_Data: freed memory for a Grid for object 3
grdimage [DEBUG]: gmtlib_unregister_io: Unregistering object no 3 [n_objects = 2]
grdimage [DEBUG]: gmtlib_unregister_io: Object no 3 has non-NULL resource pointer
grdimage [DEBUG]: Object ID 4 : Registered CPT File my.cpt as an Output resource with geometry Volume [n_objects = 3]
grdimage [DEBUG]: gmtapi_begin_io: Output resource access is now enabled [container]
grdimage [DEBUG]: gmtapi_export_palette: Passed ID = 4 and mode = 0
grdimage [INFORMATION]: Write CPT to File my.cpt
grdimage [DEBUG]: Writing CPT to my.cpt
grdimage [DEBUG]: GMT_End_IO: Output resource access is now disabled
grdimage [DEBUG]: GMT_Destroy_Data: freed memory for a CPT for object 1
grdimage [DEBUG]: gmtlib_unregister_io: Unregistering object no 1 [n_objects = 2]
grdimage [DEBUG]: gmtlib_unregister_io: Object no 1 has non-NULL resource pointer
free(): invalid pointer
Aborted
The resulting my.cpt (NB +Uk was apparently ignored):
cat my.cpt
# ENABLE_B_OPTION
-6762.00008381 black -5916.75007333 20/30/53 L
-5916.75007333 20/30/53 -5071.50006286 38/60/106 L
-5071.50006286 38/60/106 -4226.25005238 46/80/133 L
-4226.25005238 46/80/133 -3381.00004191 53/99/160 L
-3381.00004191 53/99/160 -2535.75003143 72/151/211 L
-2535.75003143 72/151/211 -1690.50002095 90/185/233 L
-1690.50002095 90/185/233 -845.250010476 141/210/239 L
-845.250010476 141/210/239 0 245/255/255 L
0 0/97/71 16.5204090185 16/122/47 L
16.5204090185 16/122/47 165.204090185 232/215/125 L
165.204090185 232/215/125 396.489816444 161/67/0 L
396.489816444 161/67/0 561.693906628 100/50/25 L
561.693906628 100/50/25 925.142905035 110/109/108 L
925.142905035 110/109/108 1321.63272148 255/254/253 L
1321.63272148 255/254/253 1619.00008381 255/254/253 B
B black
F white
N gray