From owner-freebsd-bugs  Fri Aug  9 18: 0:12 2002
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Date: Fri, 9 Aug 2002 18:00:08 -0700 (PDT)
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To: freebsd-bugs@FreeBSD.org
Cc: 
From: Ian Dowse <iedowse@maths.tcd.ie>
Subject: Re: kern/41492: Kernel Panic after cvsup'ing 8/9/02 
Reply-To: Ian Dowse <iedowse@maths.tcd.ie>
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The following reply was made to PR kern/41492; it has been noted by GNATS.

From: Ian Dowse <iedowse@maths.tcd.ie>
To: Max Clark <max@clarksys.com>
Cc: freebsd-gnats-submit@FreeBSD.org, luigi@FreeBSD.org
Subject: Re: kern/41492: Kernel Panic after cvsup'ing 8/9/02 
Date: Sat, 10 Aug 2002 01:51:23 +0100

 In message <200208092222.g79MMFqD079052@www.freebsd.org>, Max Clark writes:
 >
 >stopped at	m_freem+0x1c:	cmpl	$0,0(%ebx)
 >>How-To-Repeat:
 >I haven't been able to narrow the event to a specific event other than I cvsup
 >'d this morring after this issue (http://www.freebsd.org/cgi/query-pr.cgi?pr=4
 >1459) was resolved.
 
 Try the following patch. A recent commit broke the long-standing
 assumption that it is safe to pass NULL into m_freem().
 
 Ian
 
 Index: uipc_mbuf.c
 ===================================================================
 RCS file: /home/iedowse/CVS/src/sys/kern/uipc_mbuf.c,v
 retrieving revision 1.51.2.17
 diff -u -r1.51.2.17 uipc_mbuf.c
 --- uipc_mbuf.c	9 Aug 2002 02:11:08 -0000	1.51.2.17
 +++ uipc_mbuf.c	10 Aug 2002 00:47:30 -0000
 @@ -703,7 +703,7 @@
  {
  	int s = splimp();
  
 -        if (mcl_pool_now < mcl_pool_max && m->m_next == NULL &&
 +        if (mcl_pool_now < mcl_pool_max && m && m->m_next == NULL &&
              (m->m_flags & (M_PKTHDR|M_EXT)) == (M_PKTHDR|M_EXT) &&
              m->m_type == MT_DATA && M_EXT_WRITABLE(m) ) {
  		if (m->m_pkthdr.aux) {
 

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