Core was generated by `./map-test'. Program terminated with signal SIGABRT, Aborted. #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 51 ../sysdeps/unix/sysv/linux/raise.c: No such file or directory. (gdb) bt full #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51 set = {__val = {0 , 3544383690974588489, 2891437607586832432, 4785954420367044144, 3467835833181827887}} pid = tid = ret = #1 0x00007fb5cc169801 in __GI_abort () at abort.c:79 save_stage = 1 act = {__sigaction_handler = {sa_handler = 0x55e6e3d1f768, sa_sigaction = 0x55e6e3d1f768}, sa_mask = {__val = {94450153024952, 0, 131, 163, 94450066088561, 1, 94450173155200, 68719476921, 94450066220848, 140732130245792, 98784247808, 938448, 20, 94450175181080, 140732130245728, 140732130246016}}, sa_flags = -1063142304, sa_restorer = 0x1000} sigs = {__val = {32, 0 }} __cnt = __set = __cnt = __set = #2 0x00007fb5cc1b2897 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7fb5cc2dfb9a "%s\n") at ../sysdeps/posix/libc_fatal.c:181 ap = {{gp_offset = 24, fp_offset = 32693, overflow_arg_area = 0x7ffec0a1bd90, reg_save_area = 0x7ffec0a1bd20}} fd = list = nlist = cp = written = on_2 = next = str = len = newp = iov = total = cnt = buf = wp = old = cnt = result = #3 0x00007fb5cc1b990a in malloc_printerr (str=str@entry=0x7fb5cc2e1870 "double free or corruption (out)") at malloc.c:5350 No locals. #4 0x00007fb5cc1c0e75 in _int_free (have_lock=0, p=0x55e6e53e36e0, av=0x7fb5cc514c40 ) at malloc.c:4278 fb =