[Bug testsuite/31312] attach-many-short-lived-threads gives inconsistent results

["brobecker at gnat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31312

--- Comment #25 from Joel Brobecker <brobecker at gnat dot com> ---
Hi Thiago,

Would you be able to share an update on this PR? As I understand it,
Pedro suggested an alternative approach:

I.e., in gdb, make attach_proc_task_lwp_callback return false/0 here:

      if (ptrace (PTRACE_ATTACH, lwpid, 0, 0) < 0)
        {
          int err = errno;

          /* Be quiet if we simply raced with the thread exiting.
             EPERM is returned if the thread's task still exists, and
             is marked as exited or zombie, as well as other
             conditions, so in that case, confirm the status in
             /proc/PID/status.  */
          if (err == ESRCH
              || (err == EPERM && linux_proc_pid_is_gone (lwpid)))
            {
              linux_nat_debug_printf
                ("Cannot attach to lwp %d: thread is gone (%d: %s)",
                 lwpid, err, safe_strerror (err));

              return 0;        <<<< NEW RETURN
            }

Have you had a chance to try that, by any chance?

Thank you!

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