[Bug threads/18600] New: After forking and threads spawning, gdb leaves newly created threads stopped

["simon.marchi at ericsson dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18600

            Bug ID: 18600
           Summary: After forking and threads spawning, gdb leaves newly
                    created threads stopped
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: threads
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at ericsson dot com
  Target Milestone: ---

When a program forks and the fork childs start threads, some newly created
threads are left stopped by gdb. It's easy to reproduce with the following
example:

https://github.com/simark/gdb-fork-threads-test/

It worked with gdb 7.9, I bisected it and found that this commit introduces the
regression.

commit 2db9a4275ceada4aad3443dc157b96dd2e23afc0
Author: Pedro Alves <palves@redhat.com>
Date:   Fri Feb 20 20:21:59 2015 +0000

    GNU/Linux: Stop using libthread_db/td_ta_thr_iter

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