Segmentation fault on MacOS

[lcirrottola]

Hello,
I report a segmentation fault using the last master (46fd770) with the last master of Commons (ISCDtoolbox/Commons@e30e350) only on Mac, both with clang and gcc-10.
Reproduced by running from the demo folder:
../build/warping -s source.mesh
Short backtrace from sanitizer:

==29589==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000000 at pc 0x00010f0c7b0f bp 0x7ffee0c1a7a0 sp 0x7ffee0c19f50
READ of size 4379182344 at 0x602000000000 thread T0
    #0 0x10f0c7b0e in __asan_memcpy (libclang_rt.asan_osx_dynamic.dylib:x86_64h+0x54b0e)
    #1 0x10f039acf in csmSort sparse.c:423
    #2 0x10f038d77 in csrPack sparse.c:483
    #3 0x10efeb6d6 in matA_P1_3d elasti1_3d.c:198
    #4 0x10efeaa7e in elasti1_3d elasti1_3d.c:280
    #5 0x10efe5520 in main main.c:329
    #6 0x7fff79bb7014 in start (libdyld.dylib:x86_64+0x1014)

Not urgent to debug, reported to keep track of it in case it reappears.