misc/77651: init can loose shutdown related signals

[Sandeep Kumar]

>Number:         77651
>Category:       misc
>Synopsis:       init can loose shutdown related signals
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Feb 17 19:20:13 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Sandeep Kumar
>Release:        4.10
>Organization:
Juniper Networks
>Environment:
FreeBSD bbuild26 4.10-PRERELEASE-20040428 FreeBSD 4.10-PRERELEASE-20040428 #0: Tue May 18 11:57:20 PDT 2004     root at bbuild26.juniper.net:/usr/src/sys/compile/bbuild26  i386


>Description:
When init receives SIGHUP, the state machine's requested_transition is changed to clean_ttys. Lets say SIGTERM is received while we are in clean_ttys, it will set requested_transition to death. But at the end of clean_ttys it will return multi_user directly which then resets requested_transition. So we loose the SIGTERM sent by shutdown  
>How-To-Repeat:
Create a big /etc/ttys.
kill -1 1; shutdown -r now

Lot of times the machine will not reboot.
>Fix:
While returning, clean_ttys should check if requested_transition is
no longer clean_ttys and then return requested_transition
instead of multi_user
>Release-Note:
>Audit-Trail:
>Unformatted: