get a system crash in my fedora 16 alpha when remove external hard disk from my laptop lenovo t420

[Nelson Qiao]

hi all,

is there anybody gets same problem? and how to collect the crash information
from system. please suggest.

my system uname information is
 3.1.0-0.rc4.git0.0.fc16.i686.PAE #1 SMP Tue Aug 30 00:00:56 UTC 2011 i686
i686 i386 GNU/Linux