bin/52782: user ppp dumps core when doing pppctl "show ipcp" after loss of carrier (using Alcatel speedtouch pppoa2)

[Martin Birgmeier]

>Number:         52782
>Category:       bin
>Synopsis:       user ppp dumps core when doing pppctl "show ipcp" after loss of carrier (using Alcatel speedtouch pppoa2)
>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:   Thu May 29 03:00:31 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     Martin Birgmeier
>Release:        FreeBSD 4.8-RELEASE i386
>Organization:
MBi at home
>Environment:
System: FreeBSD gandalf.xyzzy 4.8-RELEASE FreeBSD 4.8-RELEASE #0: Sat Apr 5 13:16:25 CEST 2003 root at gandalf.xyzzy:/d/6s4e/OBJ/FreeBSD/RELENG_4_8_0_RELEASE/src/sys/GANDALF i386

>Description:
	Scenario:
	- Using user ppp together with ports/net/pppoa (Alcatel speedtouch)
	- pppoa sometimes loses carrier, or gets out of sync (actual symptom:
	  no data received any more)
	- user ppp detects this (via "enable lqr"), shuts down the child
	  pppoa processes, restarts pppoa processes
	- communication commences
	- doing 'pppctl "show ipcp"' immediately leads to the user ppp
	  core dumping, with orphan pppoa processes left behing

>How-To-Repeat:
	Follow the scenario described above

>Fix:
	Not known.
	Suspected that some variable still points at connection data from
	the old session, after the session has already been restarted.
>Release-Note:
>Audit-Trail:
>Unformatted: