bug#5333: 23.1.91; NextStep/Mac OS X: emacs -nw crash in input_available_signal + 67 (keyboard.c:7514)

[Steve Revilak]

> 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

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