#0  __GI___libc_free (mem=0x401) at malloc.c:2966
  [Error: malloc.c was not found in source tree]
#1  0x000000f6ba13daf1 in ?? ()
#2  0x00007f25bb653421 in __libc_start_main (main=0xf6ba13cd97, argc=1, argv=0x7ffc0fddf5f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc0fddf5e8) at ../csu/libc-start.c:291
  [Error: libc-start.c was not found in source tree]
#3  0x000000f6ba13c63a in ?? ()