bug#9006: 24.0.50; Abort in unshow_buffer/kill-buffer

[martin rudalics]

> I was editing a mail in Gnus when Emacs aborted; full backtrace is
> below.  This happened with all my initialization and customizations, and
> going by the Lisp backtrace, seems to involve a third-party library I
> use, tabbar.el.  I had a similar crash yesterday, when I wasn't running
> under gdb.  In both case Emacs had been running for over 12 hours and
> seemed quite sluggish.  Just before the abort I had been deleting text,
> moving point, and Emacs got less and less responsive, so I typed C-g and
> that's when the abort happened.
>
> #0  abort () at /home/steve/bzr/emacs/quickfixes/src/emacs.c:375
> No locals.
> #1  0x080a7257 in unshow_buffer (w=0x97ecc40)
>     at /home/steve/bzr/emacs/quickfixes/src/window.c:1397
>         buf = 184854789
>         b = 0xb04a900

There's a comment about a similar case in xdisp.c

  /* Make the echo area buffer current.  Note that for display
     purposes, it is not necessary that the displayed window's buffer
     == current_buffer, except for text property lookup.  So, let's
     only set that buffer temporarily here without doing a full
     Fset_window_buffer.  We must also change w->pointm, though,
     because otherwise an assertions in unshow_buffer fails, and Emacs
     aborts.  */

but I can't find a useful hint in the backtrace.  I don't even
understand why a buffer should get killed here.

martin