[Bug malloc/19469] New: M_PERTURB in test-skeleton.c invalidates malloc tests

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=19469

            Bug ID: 19469
           Summary: M_PERTURB in test-skeleton.c invalidates malloc tests
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: fweimer at redhat dot com
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

test-skeleton.c activates M_PERTURB:

  /* Make uses of freed and uninitialized memory known.  */
  mallopt (M_PERTURB, 42);

This changes code paths in malloc and invalidates some malloc tests.  We should
disable this change for malloc tests.

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