[Bug libc/16990] New: ARM: Concurrent TLS descriptor resolution fails

["will.newton at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16990

            Bug ID: 16990
           Summary: ARM: Concurrent TLS descriptor resolution fails
           Product: glibc
           Version: 2.18
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: will.newton at gmail dot com
                CC: drepper.fsp at gmail dot com
              Host: arm

When building glibc with CFLAGS="-mtls-dialect=gnu2 -O2 -g" nptl/tst-tls3
fails. This is caused by concurrent TLS descriptor resolution occuring and a
bug in the code to handle this situation.

_dl_tlsdesc_resolve_hold restores r2 as it assumes that it is being called in
the same circumstances as _dl_tlsdesc_lazy_resolver, but it is not. The lazy
resolver is called from a stub that pushes r2 whereas _dl_tlsdesc_resolve_hold
is called from the TLS descriptor trampoline which does not.

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