bug#13717: scrolling very fast makes emacs-nox segfault

[Troy Sankey <sankeytms@gmail.com>]

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> Scroll which file?  The *scratch* buffer is too short, and cannot be
> scrolled.

Yes, the *scratch* buffer (but any buffer will do). It doesn't visually
scroll, but on my machine scrolling produces a lot of audible bells and
emacs keeps saying "Beginning/End of buffer".

> I hope someone can post a backtrace, because this is 100% not
> reproducible on my system (but I don't have gnome-terminal or
> gnome-shell).

I was able to produce a backtrace by ensuring my *-debuginfo packages
were the same version as my emacs packages :P  I'm not entirely sure how
this bug tracker takes pastes... so I've attached it. Also mirrored
here: http://eserver.sytes.net/tmp/emacs-nox-scrolling-bt.txt

> Also, could you perhaps try a recent pretest of Emacs 24.3?  If that
> problem doesn't exist there, it probably was already solved.

I'm a little busy, but I'll get back to compiling emacs later today.

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#0  0x00000000004ed5a3 in lisp_align_malloc (type=type@entry=MEM_TYPE_CONS, nbytes=1008) at alloc.c:1118
#1  0x00000000004ed966 in Fcons (car=11457778, cdr=<optimized out>) at alloc.c:2775
#2  0x00000000004a5ec0 in Fkey_binding (key=key@entry=11461349, accept_default=11407954, no_remap=11408002, position=11407954) at keymap.c:1714
#3  0x00000000004a6085 in Fcommand_remapping (keymaps=<optimized out>, position=<optimized out>, command=<optimized out>) at keymap.c:1249
#4  Fcommand_remapping (command=<optimized out>, position=<optimized out>, keymaps=<optimized out>) at keymap.c:1240
#5  0x000000000049e5d3 in read_key_sequence (keybuf=keybuf@entry=0x7fffffffd330, prompt=11407954, dont_downcase_last=dont_downcase_last@entry=0, can_return_switch_frame=can_return_switch_frame@entry=1, fix_current_buffer=fix_current_buffer@entry=1, bufsize=30) at keyboard.c:10055
#6  0x000000000049edfc in command_loop_1 () at keyboard.c:1449
#7  0x00000000005053d1 in internal_condition_case (bfun=bfun@entry=0x49ec10 <command_loop_1>, handlers=11475938, hfun=hfun@entry=0x494a10 <cmd_error>) at eval.c:1514
#8  0x000000000049351e in command_loop_2 (ignore=ignore@entry=11407954) at keyboard.c:1160
#9  0x00000000005052cb in internal_catch (tag=<error reading variable: Cannot access memory at address 0xffffffffffffffe2>, func=func@entry=0x493500 <command_loop_2>, arg=11407954) at eval.c:1271
#10 0x00000000004944f7 in command_loop () at keyboard.c:1139
#11 recursive_edit_1 () at keyboard.c:759
#12 0x0000000000494825 in Frecursive_edit () at keyboard.c:823
#13 0x0000000000407e5d in main (argc=<optimized out>, argv=0x7fffffffdb58) at emacs.c:1715