[Bug malloc/21338] New: mallopt M_ARENA_MAX doesn't set the maximum number of arenas

["laanwj at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21338

            Bug ID: 21338
           Summary: mallopt M_ARENA_MAX doesn't set the maximum number of
                    arenas
           Product: glibc
           Version: 2.25
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: laanwj at gmail dot com
  Target Milestone: ---

Commit be7991c0705e35b4d70a419d117addcd6c627319 (which is in version 2.25)
introduced helper functions for setting arena_max, arena_test and other malloc
parameters. However it contained a typo in a switch statement in
__libc_mallopt, which results in that M_ARENA_MAX sets arena_test instead.

This has the result that setting mallopt M_ARENA_MAX or env MALLOC_ARENA_MAX no
longer sets the maximum number of arenas.

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