The solution is to rebuild my testing program:
$ gcc main.c
$ valgrind ./a.out
==19235== Memcheck, a memory error detector
==19235== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al.
==19235== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
==19235== Command: ./a.o
Hello,
I have recently built my own package of glibc instead of using the one provided
by my operating system.
The result is that valgrind is now complaining:
---
$ valgrind ./a.out
==1445== Memcheck, a memory error detector
==1445== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et a
