#0  0x00007f0c6101f02d in _int_free (av=0x7f0c6135e760 <main_arena>, p=<optimized out>, have_lock=0) at malloc.c:3987
        size = 33104
        fb = <optimized out>
        nextchunk = 0x14ccf40
        nextsize = 16368
        nextinuse = <optimized out>
        prevsize = <optimized out>
        bck = 0x404e000000000000
        fwd = 0x404e000000000000
        errstr = 0x0
        locked = <optimized out>
#1  0x00007f0c618d7419 in GMT_graticule_path () from /usr/lib/libgmt.so.4
No symbol table info available.
#2  0x00007f0c618fe85d in GMT_assemble_shore () from /usr/lib/libgmt.so.4
No symbol table info available.
#3  0x00000000004037bb in ?? ()
No symbol table info available.
#4  0x00007f0c60fc0ec5 in __libc_start_main (main=0x402110, argc=10, argv=0x7fff2580d128, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff2580d118) at libc-start.c:287
        result = <optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, -5201055827430364118, 4217510, 140733822587168, 0, 0, 5200646335227341866, 5317311556041813034}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x405fc0, 0x7fff2580d128}, data = {prev = 0x0, cleanup = 0x0, canceltype = 4218816}}}
        not_first_call = <optimized out>
#5  0x0000000000405acf in ?? ()
No symbol table info available.