misc/179530: tty gets unresponsive when in scrolling mode and shell killed

[Gerasimos Dimitriadis]

>Number:         179530
>Category:       misc
>Synopsis:       tty gets unresponsive when in scrolling mode and shell killed
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jun 13 08:50:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Gerasimos Dimitriadis
>Release:        9.1
>Organization:
Intracom Telecom
>Environment:
FreeBSD x200-freebsd 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec  4 09:23:10 UTC 2012     root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
Under certain circumstances, a virtual terminal gets unresponsive when the shell that is using it gets killed. Specifically, when scroll lock has been pressed and some keystrokes are buffered, then when the shell is killed, the virtual terminal remains unresponsive
>How-To-Repeat:
1. Log into a virtual console
2. Press scroll lock
3. Press some non-special keys, e.g. asdfas
   (Nothing is printed in scrolling mode, but the keystrokes are buffered)
4. Kill the shell that is using this tty
5. Press scroll lock to exit scrolling mode
6. tty remains hanging

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: