[Bug malloc/19048] Avoid corruption of free_list

[paulo.cesar.pereira.de.andrade at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19048

--- Comment #3 from Paulo Andrade <paulo.cesar.pereira.de.andrade at gmail dot com> ---
Created attachment 8669
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8669&action=edit
test.c

This is an alternate test case (older, from before detecting
the actual problem), that also shows how the patch makes a
significant difference.

Sample usage of this alternate test case:

$ gcc -pthread test.c -o test
$ ./test 1000 10000 1000 10

will cause all passes to run very slowly, while:

$ MALLOC_ARENA_MAX=1000 ./test 1000 10000 1000 10

allocating one arena per thread, will only be slow
in the first pass, but, with the proposed patch, it
is "fast" in all passes.

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