#0  0x000000000040e394 in free ()
#1  0x00007f06161fef6d in *__GI___res_iclose (statp=0x7f06047ffdc8, free_addr=true) at res_init.c:605
#2  0x00007f0616229072 in res_thread_freeres () at res_init.c:632
#3  0x00007f0616229012 in __libc_thread_freeres () at thread-freeres.c:30
#4  0x00007f06170f902a in start_thread (arg=<value optimized out>) at pthread_create.c:307
#5  0x00007f06161f238d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()