23.0.50; `read-event' changes `current-buffer'

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug <at> gnu.org mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Hello,

to reproduce:

$ emacs -Q
M-x eshell RET
$ while #'(lambda () t) { echo XXX; sleep 1}
C-x b *scratch* RET

(with-temp-buffer
  (let ((buf (current-buffer)))
    (read-event nil nil 3)
    (format ":%s: :%s:" (buffer-name buf) (current-buffer))))

C-u C-x C-e

": *temp*: :*eshell*:"

David

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/home/dhansen/share/emacs/23.0.50/etc/DEBUG for instructions.

In GNU Emacs 23.0.50.1 (i686-pc-linux-gnu)
 of 2007-10-28 on robotron
Windowing system distributor `The X.Org Foundation', version 11.0.10400000
configured using `configure  '--prefix=/home/dhansen' '--disable-sound' '--disable-pop' '--with-x-toolkit=no''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: EShell

Minor modes in effect:
  TeX-PDF-mode: t
  jabber-activity-mode: t
  which-function-mode: t
  show-paren-mode: t
  iswitchb-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  abbrev-mode: 1

Recent input:
<switch-frame> M-x g n u s <return> y C-n C-n C-n C-n 
C-n M-g <switch-frame> <switch-frame> G <switch-frame> 
<switch-frame> <switch-frame> C-x C-w C-g <C-tab> C-x 
C-w C-g C-x k <return> <C-tab> C-z d <backspace> c 
d <return> w h i l e SPC # ' ( C-e <backspace> C-b 
l a m b d a SPC ( C-f SPC t C-e SPC { SPC e c h o SPC 
X X X C-e C-b ; SPC s l e e p SPC 1 C-e <return> <switch-frame> 
C-p RET RET <switch-frame> <switch-frame> n n E ( c 
u r r e n t - b u f f f e r C-b C-b <backspace> C-e 
C-c C-u <C-tab> n n n n n n n n n n n n n n n <switch-frame> 
C-x b s c r <return> ( w i t h - t e m p <M-tab> b 
u <M-tab> <return> ( l e t SPC ( b u f SPC ( b <backspace> 
c u r r e n t - b u f f e r ) ) ) ( s i t - f o r SPC 
1 ) ( f o r m a t SPC C-h f <return> " : % s : SPC 
: % s : C-f SPC ( b u f f e r - n a m e SPC b u f C-f 
SPC ( c u r r e n t - b u f f e r C-e C-x C-e C-x 1 
<switch-frame> <switch-frame> M-N M-< C-SPC C-e C-n 
C-n C-n C-e C-w <switch-frame> <switch-frame> C-z M-> 
C-c C-c M-p C-a C-k <switch-frame> <switch-frame> <switch-frame> 
<switch-frame> C-x 1 M-x r e p o r t - e m a c s - 
b u g <return>

Recent messages:
Result: nil [4 times]
Result: #<process /home/dhansen/bin/w3m>
Result: exit
Result: nil [3 times]
Result: #<process /home/dhansen/bin/w3m>
Result: 0 (#o0, #x0, ?\C-@) [3 times]
Parsing BBDB... (frobnicating...done)
": *temp*: :*eshell*:"
Mark set [3 times]
History item: 128