>From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>

>According to the stack trace, the crash seems to happen by
>dereferencing NULL pointer (with some offset) in a non-main thread
>executing the following code in the SIGIO handler.
>
>  if (input_available_clear_time)
>    EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
>
>EMACS_SET_SECS_USECS consists of multiple instructions, and
>input_available_clear_time might be cleared to NULL by the main thread
>between the NULL-check and the completion of EMACS_SET_SECS_USECS in a
>non-main thread.
>
>Could you try the following patch for a while to see if it can avoid
>the issue?


YAMAMOTO,

Thank you for the patch.  I'll will test it this week.

Steve Revilak