two tasks block on rtems_termios_write()

[Yang Ke]

> Yang Ke wrote:
> >
> > Hello,
> >     with unknown reason, two tasks in my system (rtems on PPC8260)
> > blocks on trying to acquire the semaphore. i dump the call stacks
> > of these two tasks :
> >
> > task A:
> > fputs->
> > ........... ->console_write->rtems_termios_write->rtems_semaphore_obtain
> > ->_Thread_Enable_dispatch->_Thread_Dispatch
> > task B:
> > vfprintf-> ......>console_write->rtems_termios_write->rtems_termio_puts
> > -> rtems_semaphore_obtain->_Thread_Enable_dispatch->_Thread_Dispatch
> >
> > this problem occurs very occasionally and i was not able to reproduce it
> > in certain steps. from the callstack, looks like deallock happened
> > somewhere.
> > did anybody meet the same problem ? and any clues ?
>
> Can you give us your version number and target processor so we can check
> if any relevant bug fixes have occurred.

version 4.5.0 , target processor is PowerPC8260.

Thanks,
yangke