[Bug malloc/22159] New: Tests segfault on --enable-tunables=no

["tuliom at linux dot vnet.ibm.com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22159

            Bug ID: 22159
           Summary: Tests segfault on --enable-tunables=no
           Product: glibc
           Version: 2.27
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: tuliom at linux dot vnet.ibm.com
  Target Milestone: ---

The following tests are segfaulting when glibc is configured with
--enable-tunables=no:

FAIL: elf/tst-env-setuid
FAIL: malloc/tst-malloc-usable
FAIL: malloc/tst-malloc-usable-static
FAIL: malloc/tst-mcheck

I reproduced this issue on ppc, ppc64, ppc64le and x86_64.

I bisected these failures to:

commit ac3ed168d0c0b2b702319ac0db72c9b475a8c72e
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Aug 30 19:29:38 2017 +0200

    malloc: Remove check_action variable [BZ #21754]

    Clean up calls to malloc_printerr and trim its argument list.

    This also removes a few bits of work done before calling
    malloc_printerr (such as unlocking operations).

    The tunable/environment variable still enables the lightweight
    additional malloc checking, but mallopt (M_CHECK_ACTION)
    no longer has any effect.

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