[Bug malloc/19048] Avoid corruption of free_list

["paulo.cesar.pereira.de.andrade at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

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

Paulo Andrade <paulo.cesar.pereira.de.andrade at gmail dot com> changed:

           What    |Removed                     |Added
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   Attachment #8672|0                           |1
        is obsolete|                            |

--- Comment #6 from Paulo Andrade <paulo.cesar.pereira.de.andrade at gmail dot com> ---
Created attachment 8674
  --> https://sourceware.org/bugzilla/attachment.cgi?id=8674&action=edit
0001-Avoid-corruption-of-free_list.patch

Also properly handle the case of the arena associated
with the exiting thread already being the head of free_list.

The idea is to put the arena as last to be reused, in
a round robin manner. Other more complex "scheduling"
could be implemented, but could require maintaining a
reference counter of arenas, increased when set as
thread arena, reset when unset as thread arena, or
thread exits.

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