>Number:         629
>Category:       kern
>Synopsis:       "sleep 3" sleeps forever (from /etc/ppp/ip-down)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people (Kernel Bug People)
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 11 08:35:25 1994
>Originator:     Bob Kemp
>Organization:
Bob Kemp		rsk@allegory.demon.co.uk
>Release:        1.0
>Environment:
System: NetBSD allegory 1.0 NetBSD 1.0 (ALLEGORY) #0: Thu Dec 8 22:38:18 GMT 1994 root@allegory:/usr/src/sys/arch/i386/compile/ALLEGORY i386


>Description:

	I have a dial-up Internet connection using PPP.  It runs fine
	except that when shutting down, the call to sleep 3 in /etc/ppp/ip-down
	waits forever.  When I kill the sleep procees, everything continues
	as it should.

	The system is pretty vanilla 1.0 (having just upgraded) but there
	was a similar problem with a mongrel 1.0beta I ran before.

	I have applied patches 0,2,3,4,5.  Patch 1 is irrelevant to my system.

>How-To-Repeat:

	I'm not sure what to put here  (Advice Welcome!)
	I cannot reproduce it except in /etc/ppp/ip-down
	but there it is _boringly_consistent_.

	Below are the outputs from "ps axglww" and "fstat -p 1235" but
	first here is /etc/ppp/ip-down.  "hangup" call kermit to hangup
	the phone line.  "timer_control end" kills the phone call timer
	process.

	> #!/bin/sh
	> 
	> echo running $0
	> 
	> # hangup
	> # timer_control end
	> 
	> hangup && timer_control end &
	> 
	> sleep 3
	> # /bin/sleep 2
	> 
	> if [ -f /var/run/sendmail.pid ]; then
	> 	set `cat /var/run/sendmail.pid`
	> 	echo 'killing sendmail, PID =' $1
	> 	kill $1
	> 	sendmail -q &		# clear the mail queues
	> fi
	> 
	> if [ -f /var/run/slurp.pid ]; then
	> 	pid=`cat /var/run/slurp.pid`
	> 	echo 'killing slurp, PID =' ${pid}
	> 	kill ${pid}
	> 	rm -f /var/run/slurp.pid
	> fi
	> 
	> if [ -f /usr/local/news/innd/innd.pid ] ; then
	> 	pid=`cat /usr/local/news/innd/innd.pid`
	> 	echo 'killing innd, PID =' ${pid}
	> 	kill ${pid}
	> fi
	> 
	> echo -n Running nnmaster in the background...
	> /usr/local/lib/nn/nnmaster -LM 2>&1 | logger &
	> echo ''



  UID   PID  PPID CPU PRI NI   VSZ  RSS WCHAN  STAT TT       TIME COMMAND
    0     0     0   0 -18  0     0    0 schedu DLs  ??    0:00.02 (swapper)
    0     1     0   0  10  0   192   76 wait   Is   ??    0:00.16 /sbin/init
    0     2     0   0 -18  0     0   12 thrd_s DL   ??    0:01.82 (pagedaemon)
    0    42     1   0   2  0    52  124 select Is   ??    0:00.06 portmap
    0    50     1   0   2  0    72  224 select Ss   ??    0:00.71 syslogd
    0    65     1   0  18  0    16  120 pause  Ss   ??    0:00.76 update
    0    67     1   0  18  0   156  228 pause  Is   ??    0:00.28 cron
    0    73     1   3   2  0    80  172 select Is   ??    0:00.12 lpd
    0    79     1   0   2  0   100  188 select Is   ??    0:00.47 inetd
    0   927     1   0   2  0   308  268 netcon Is   ??    0:00.10 sendmail: accepting connections (sendmail)
    0   928   927   2  28  0     0    0 -      Z    ??    0:00.00 (sendmail)
    0   932   927   2  28  0     0    0 -      Z    ??    0:00.00 (sendmail)
    0   933   927   3  28  0     0    0 -      Z    ??    0:00.00 (sendmail)
    0   941   927   2  28  0     0    0 -      Z    ??    0:00.00 (sendmail)
    0   942   927   2  28  0     0    0 -      Z    ??    0:00.00 (sendmail)
    0  1235  1226   0  18  0    36   36 pause  I    ??    0:00.04 sleep 3
    0  1226     1   0  10  0   292  156 wait   I    00-   0:00.07 /bin/sh /etc/ppp/ip-down ppp0 /dev/modem 57600 158.152.31.201 158.152.250.194
   15   129     1   0   3  0   672  500 ttyin  Is+  v0    0:01.77 -tcsh (tcsh)
32767   130     1   0  18  0   164  220 pause  Ss+  v1    0:10.95 /usr/sbin/iostat 1 /usr/allegory/bin/IoStatus
   15   131     1   2  18  0   708  520 pause  Ss   v2    0:06.69 -tcsh (tcsh)
   15  1297   131   0  28  0   548  952 -      T    v2    0:00.70 vi slurp.msg
   15  1315   131   5  29  0   240  172 -      R+   v2    0:00.04 ps axglww
    0   132     1   0   3  0   584  144 ttyin  Is+  v3    0:00.93 -tcsh (tcsh)
    0   133     1   1   3  0    48  144 ttyin  Is+  v4    0:00.10 /usr/libexec/getty Pcvt ttyv4

>Fix:
>Audit-Trail:
>Unformatted: