Subject: kern/26736: 'looutput: no header mbuf' with today's 2.0beta
To: None <>
From: None <>
List: netbsd-bugs
Date: 08/22/2004 23:52:33
>Number:         26736
>Category:       kern
>Synopsis:       'looutput: no header mbuf' when named starts
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Aug 23 03:53:00 UTC 2004
>Originator:     Steven M. Bellovin
>Release:        NetBSD 2.0_BETA
System: NetBSD 2.0_BETA NetBSD 2.0_BETA (HUDSON) #0: Sun Aug 22 22:48:24 EDT 2004 i386
Architecture: i386
Machine: i386
	With a kernel from today's 2.0beta source, I get a
	panic ('looutput: no header mbuf') when named starts up.
	I believe that this is the same as kern/26666, but I'm now seeing
	it on 2.0beta as well as on -current.  It is almost certainly tied
	to ipfilter, since on -current I can bypass the problem by not
	starting ipfilter.  I do not see the problem on a 2.0beta kernel
	from 8 August.  (Of course, I really want the newer ipfilter, since
	it has icmpmapid, which the 8 August version does not.)  Note that
	I'm seeing this with only ipnat enabled, and without starting
	ipfilter per se.  (On -current, I'm seeing it with ipfilter and
	not ipnat.)
	See above.  I can send my ipnat.conf if you want.  I do not have
	a core dump for 2.0beta, possibly because the machine is RAID-based.
	The only bypass I know is to avoid running ipfilter -- but on
	this machine, I need to run it...