gimp from git on fedora 26 x86_64 crash on start.
(gdb)
#0 0x00007ffff213d66b in raise () at /lib64/libc.so.6
#1 0x00007ffff213f381 in abort () at /lib64/libc.so.6
#2 0x00007ffff21358fa in __assert_fail_base () at /lib64/libc.so.6
#3 0x00007ffff2135972 in () at /lib64/libc.so.6
#4 0x00007ffff321e0dc in mypaint_mapping_set_n (self=<optimized out>, input=<optimized out>, n=<optimized out>) at mypaint-mapping.c:88
#5 0x00007ffff3220f88 in update_brush_setting_from_json_object (setting_obj=<optimized out>, setting_name=0x1cea080 "radius_logarithmic", self=0x11021f0) at mypaint-brush.c:1153
#6 0x00007ffff3220f88 in update_brush_from_json_object (self=0x11021f0) at mypaint-brush.c:1195
#7 0x00007ffff3220f88 in mypaint_brush_from_string (self=0x11021f0, string=<optimized out>) at mypaint-brush.c:1223
#8 0x0000000000883d8e in ()
#9 0x0000000000000000 in ()
"radius_logarithmic": {
"base_value": 1.1,.
"inputs": {
}
},.