[Bug libc/24164] Systemtap probes need to use "nr" constraint on 32-bit Arm, not the default "nor"

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=24164

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bc10e22c90e42613bd5dafb77b80a9ea1759dd1b

commit bc10e22c90e42613bd5dafb77b80a9ea1759dd1b
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Feb 15 19:09:00 2019 +0100

    nptl: Fix invalid Systemtap probe in pthread_join [BZ #24211]

    After commit f1ac7455831546e5dca0ed98fe8af2686fae7ce6 ("arm: Use "nr"
    constraint for Systemtap probes [BZ #24164]"), we load pd->result into
    a register in the probe below:

          /* Free the TCB.  */
          __free_tcb (pd);
        }
      else
        pd->joinid = NULL;

      LIBC_PROBE (pthread_join_ret, 3, threadid, result, pd->result);

    However, at this point, the thread descriptor has been freed.  If the
    thread stack does not fit into the thread stack cache, the memory will
    have been unmapped, and the program will crash in the probe.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                  |    6 ++++++
 nptl/pthread_join_common.c |    5 +++--
 2 files changed, 9 insertions(+), 2 deletions(-)

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