when i run checkbox, the process of backend keep running

Binary package hint: checkbox

when i run checkbox, the process of backend keep running.when i close the checkbox,the process of backend always 100%

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: checkbox 0.9.1
ProcVersionSignature: Ubuntu 2.6.32-29.58-generic-pae 2.6.32.28+drm33.13
Uname: Linux 2.6.32-29-generic-pae i686
NonfreeKernelModules: ksplice_1xaszce3 ksplice_ha1bh78s ksplice_7tz7jkqg ksplice_r3gb4vqe_vmlinux_new ksplice_r3gb4vqe ksplice_cg7p9qhy_vmlinux_new ksplice_cg7p9qhy ksplice_lh0tz07i ksplice_4ehnc7y4 ksplice_d2vnf8q2_vmlinux_new ksplice_d2vnf8q2 ksplice_c4uzimsc_vmlinux_new ksplice_c4uzimsc ksplice_c7d51jaf ksplice_zvl49d3d_vmlinux_new ksplice_zvl49d3d ksplice_jc4fygki_vmlinux_new ksplice_jc4fygki ksplice_dj6z660u_vmlinux_new ksplice_dj6z660u ksplice_nvyr6030 ksplice_mwnd4gxv ksplice_bynv0741_vmlinux_new ksplice_bynv0741 ksplice_gk631y23_vmlinux_new ksplice_gk631y23 ksplice_w279ybbe ksplice_w2lj8lj7_vmlinux_new ksplice_w2lj8lj7 ksplice_ideetahy ksplice_wayn9l5n ksplice_sfp4cz35 ksplice_08c0m0v6_vmlinux_new ksplice_08c0m0v6 ksplice_gfd116j5_vmlinux_new ksplice_gfd116j5 ksplice_ocgnkk9u ksplice_cxua2cdw ksplice_f9w2tsjz_vmlinux_new ksplice_f9w2tsjz ksplice_wmjbp4am_vmlinux_new ksplice_wmjbp4am ksplice_p77gp7ah ksplice_xep4axme_vmlinux_new ksplice_xep4axme nvidia wl
Architecture: i386
Date: Tue May 3 09:25:37 2011
ExecutablePath: /usr/share/checkbox/backend
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
InterpreterPath: /usr/bin/python2.6
PackageArchitecture: all
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=zh_CN.utf8
 LANGUAGE=zh_CN:zh
SourcePackage: checkbox