kern/38341: ifwatchd misses pppoe0 up event in -current after changes on March 26/27th

[mk%kilbi.de@localhost]

>Number:         38341
>Category:       kern
>Synopsis:       ifwatchd misses pppoe0 up event in -current after changes on 
>March 26/27th
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 30 09:15:00 +0000 2008
>Originator:     Markus W Kilbinger
>Release:        NetBSD 4.99.58
>Organization:
net
>Environment:
System: NetBSD qube 4.99.58 NetBSD 4.99.58 (QUBE) #86: Sun Mar 30 08:00:57 MEST 
2008
Architecture: mipsel
Machine: cobalt
>Description:
        After -current changes on March 26/27th kernels timing/signal
        behavior of my cobalt qube2's pppoe0 interface for ifwatchd
        changed.

        Formerly a simple/final

          inet 0.0.0.0 0.0.0.1 up

        in /etc/ifconfig.pppoe0 produced a

            /usr/sbin/ifwatchd[131]: calling: /etc/ppp/ip-up pppoe0 ...

        call later on.

        Now, with the same config, pppoe0's associating with my isp no
        longer produces an ifwatchd calling if ifwatchd is started
        before this association successfully happened.

        I can workaround this problem by appending

          !/bin/sleep 4

        at the end of/etc/ifconfig.pppoe0, so that the event

          pppoe0: connected to XXXXXX

        happens _before_ /etc/rc.d/ifwatchd is started.

        Otherwise, ifwatchd is missing / not receiving pppoe0's up
        event.
>How-To-Repeat:
        Problem now seems that ifwatchd no longer receives an up event
        signal if pppoe (and other?) devices are not already
        'associated/connected' on their lower layer.

        -> Start ifwatchd _before_ e. g. pppoe0 associates and observe
           that it is not receving an up event when pppoe0 associates
           afterwards.
>Fix:
        Unknown

        Workaround: Delay starting of ifwatchd until the relevant
        devices are already sucessfully associated/connected.