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Re: C-g crash in C-x C-f (OSX Lion)

From: Carsten Mattner
Subject: Re: C-g crash in C-x C-f (OSX Lion)
Date: Fri, 16 Dec 2011 22:22:54 +0100

On Fri, Dec 16, 2011 at 10:11 PM, Eli Zaretskii <address@hidden> wrote:
>> Date: Fri, 16 Dec 2011 21:19:19 +0100
>> From: Carsten Mattner <address@hidden>
>> Cc: address@hidden
>> > #0  0x9adc5d50 in strlen ()
>> > #1  0x001e7601 in intern (str=0x0) at lread.c:3707
>> > #2  0x00283efb in ns_string_to_symbol (t=0x0) at nsselect.m:86
>> > #3  0x002847ab in ns_handle_selection_request (event=0xbfffef88) at
>> > nsselect.m:247
>> >
>> > vs the below with with the terminal frontend.
>> >
>> > Next I will not load evil-mode and see what happens.
>> Can these crashes happen due to enabled assertions?
> No.  Emacs crashes because it tries to compute the length of a string
> specified by a NULL pointer.  It looks like this happens due to a
> selection request, but when that request is handled, Emacs tries to
> intern a name that is a NULL string.

What about the other crash which happened when I ran it as
emacs -nw?

> I don't know enough about the NS build and the code in nsselect.m to
> reason why this could happen.  In particular, I don't understand this
> portion of the code:
>  static void
>  ns_handle_selection_request (struct input_event *event)
>  {
>    id pb = (id)*(EMACS_INT*)&(event->x);
>    ...
>    selection_name = ns_string_to_symbol ([(NSPasteboard *)pb name]);
> How come the x coordinate of an event could be passed to
> ns_string_to_symbol as a string, no matter how it is type-cast??
> This certainly isn't related to enabled assertions.

I also didn't think so, but it's a foreign codebase and it's C, so
better ask than assume.

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