kern/173010: Backgrounded processes remain in ttyin state / SIGCONT does not remove sleeping processes from sleep queue

[Jeremy Chadwick]

>Number:         173010
>Category:       kern
>Synopsis:       Backgrounded processes remain in ttyin state / SIGCONT does not remove sleeping processes from sleep queue
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Oct 24 03:50:00 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     Jeremy Chadwick
>Release:        FreeBSD 9.1-PRERELEASE amd64
>Organization:
>Environment:
System: FreeBSD icarus.home.lan 9.1-PRERELEASE FreeBSD 9.1-PRERELEASE #0: Sun Oct 21 05:24:09 PDT 2012 root at icarus.home.lan:/usr/obj/usr/src/sys/X7SBA_RELENG_9_amd64 amd64
>Description:
	The following bug/quirk in the tty layer has been discovered.  This
	issue affects processes which require tty input but are backgrounded.

	This issue has been discussed with kib@ and ed@ on freebsd-stable who
	confirmed the issue.

	Full details are in the thread titled "pty/tty or signal strangeness,
	or grep/bsdgrep bug?" here:

	http://lists.freebsd.org/pipermail/freebsd-stable/2012-October/thread.html#70204

	This affects any process that requires tty input; it's not specific
	grep/bsdgrep.
>How-To-Repeat:
	Step-by-step instructions are available:

	http://lists.freebsd.org/pipermail/freebsd-stable/2012-October/070204.html
>Fix:
	kib@ did provide a patch but mentioned it would be best to wait for
	what ed@ proposes.
>Release-Note:
>Audit-Trail:
>Unformatted: