usb/92052: usbd causes defunct process with busy file-handle

[Vladimir Jakubal]

>Number:         92052
>Category:       usb
>Synopsis:       usbd causes defunct process with busy file-handle
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-usb
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jan 20 11:20:03 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Vladimir Jakubal
>Release:        6.0
>Organization:
GJK
>Environment:
6.0-RELEASE FreeBSD 6.0-RELEASE #3 ... i386
>Description:
usbd driver with HP LaserJet 2200 connected on /dev/unlpt0.
turning off (disconnecting) the printer at the same time with running process with opened file handle "/dev/unlpt0" causes fall-off of the process to "Defunct" state. It cannot be killed and the device cannot be used again even if reconnected before next restart of the system.
>How-To-Repeat:
Running process with opened file handle to /dev/unlpt0 (ulpt0 makes the same)
Turning off the printer (or disconnecting)
-> dmesg : ulpt0: at hub0 port1 (addr 2) disconnected
AND process becomes defunct. Cannot be killed (I/O usage).
>Fix:
              
>Release-Note:
>Audit-Trail:
>Unformatted: