[Bug nptl/18743] New: PowerPC: findutils testcase fails with --enable-lock-elision

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

https://sourceware.org/bugzilla/show_bug.cgi?id=18743

            Bug ID: 18743
           Summary: PowerPC: findutils testcase fails with
                    --enable-lock-elision
           Product: glibc
           Version: 2.21
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: tuliom at linux dot vnet.ibm.com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

This has been initially reported at:
https://bugzilla.suse.com/show_bug.cgi?id=923486

OpenSUSE team found an intermittent issue with pthread's rwlock functions while
running the tests from findutils.
test_twlock was reporting different values for check_accounts:

=== trial: 24: failure: 0
Starting test_lock ... OK
Starting test_rwlock ...check_accounts: sum=4006, expected 4000
check_accounts: sum=4006, expected 4000 
check_accounts: sum=4006, expected 4000
check_accounts: sum=4006, expected 4000
Aborted (core dumped)
=== trial: 25: failure: 1
=== trial: 616: failure: 29
Starting test_lock ... OK
Starting test_rwlock ...check_accounts: sum=3994, expected 4000
check_accounts: sum=3994, expected 4000 
check_accounts: sum=3994, expected 4000
check_accounts: sum=3994, expected 4000
Aborted (core dumped)
=== trial: 617: failure: 30
=== trial: 866: failure: 39

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