bug#13012: Assertion failure in xdisp.c:window_outdated

[Eli Zaretskii]

> From: Juanma Barranquero <lekktu@gmail.com>
> Date: Tue, 27 Nov 2012 17:32:18 +0100
> 
> Package: emacs
> Version: 24.3.50
> 
> 
> emacs -Q --eval "(setq mode-line-position '(:propertize \"%l/%c\" face
> default))" -f server-mode
> emacsclient -n some-file
> 
> xdisp.c:10906: Emacs fatal error: assertion failed: XBUFFER
> (w->buffer) == current_buffer

This is a duplicate of 13007.

> (gdb) bt
> #0  terminate_due_to_signal (sig=22, backtrace_limit=2147483647) at 
> emacs.c:314
> #1  0x010218da in die (msg=0x15c5930 "assertion failed: XBUFFER
> (w->buffer) == current_buffer", file=0x15bdfb0 "xdisp.c", line=10906)
>     at alloc.c:6487
> #2  0x011fe645 in window_outdated (w=0x39bda68
> <__register_frame_info+60545640>) at xdisp.c:10906

What is w->buffer in this frame?