emacs22-gtk gets frozen and unresponsive

Binary package hint: emacs22

I use emacs to view some documents and then switch to firefox to browse some web for a while. After I switch back to emacs again, it becomes unresponsive and show a blank content in the window. The menu of it also disappears.

I refer <https://wiki.ubuntu.com/Backtrace> and make a backtrace after emacs22-gtk hangs. The result is as the attached gdb-emacs22-gtk.txt.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
Package: emacs22-gtk 22.2-0ubuntu2
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=zh_TW.UTF-8
 SHELL=/bin/bash
SourcePackage: emacs22
Uname: Linux 2.6.27-9-generic i686