[issue251] Panic on -current

[Matthew Dillon]

:Yes, there is a USB scanner plugged in, and I never unplugged it.
:
:What is a VCHR device?

    Its just the #define used to identify a CHR device, which is 
    basically everything in /dev.

    In anycase, the latest HEAD should fix the issue.  I'm guessing
    that one of those GUI programs is revoke()ing access to the
    device while another one has an open descriptor to it and then
    tries to mmap() it.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>