Invalid read of size 1
   at 0x........: test_begin (brk.c:19)
   by 0x........: main (brk.c:78)
 Address 0x........ is 0 bytes after the brk data segment limit 0x........

Invalid read of size 1
   at 0x........: test_begin (brk.c:32)
   by 0x........: main (brk.c:78)
 Address 0x........ is 0 bytes after the brk data segment limit 0x........

brk segment overflow in thread #1: can't grow to 0x........