:Attached patch does stop the panic, but I still get warnings from :ucom when it's unloaded: : :Jun 2 17:07:06 gzl /kernel: ucom: Warning: cdevsw_remove() called while 1 devic :e refs still exist! (major 138) All right, I think that's a fine patch, I'll commit it! Don't worry about the warning for now. -Matt