[PATCH][malloc] Improve malloc initialization sequence

[Florian Weimer]

On 09/29/2017 06:48 PM, Wilco Dijkstra wrote:
>        thread attempting to use the arena in parallel waits on us till we
>        finish.  */
>     __libc_lock_lock (main_arena.mutex);
> -  malloc_consolidate (&main_arena);
> +  malloc_init_state (&main_arena);

The locking is unnecessary.  You should remove it and call 
malloc_init_state before the tunables preprocessor conditional.

I believe this fixes bug 22159, so please reference this bug (both in 
the commit message and the ChangeLog).

Thanks,
Florian