[Bug threads/18127] New: threads spawned by infcall end up stuck in "running" state

["palves at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18127

            Bug ID: 18127
           Summary: threads spawned by infcall end up stuck in "running"
                    state
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: threads
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com

Ref: https://sourceware.org/ml/gdb/2015-03/msg00033.html

Calling a function that spawns new threads results in the new threads getting
stuck in "running" state.

On GNU/Linux, and a trivial program that has:

~~~
void
start_thread (void)
{
  pthread_t thread;

  pthread_create (&thread, NULL, thread_function, NULL);
}
~~~

calling that from GDB results in:

(gdb) p start_thread ()
[New Thread 0x7ffff7fc1700 (LWP 9903)]
$1 = void
(gdb) info threads
  Id   Target Id         Frame
  2    Thread 0x7ffff7fc1700 (LWP 9903) "start-thread-in" (running)
* 1    Thread 0x7ffff7fc2740 (LWP 9899) "start-thread-in" main () at
start-thread-infcall.c:35

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