Date: Tue, 11 May 1999 13:00:04 -0500 From: Bob Willcox <bob@luke.pmr.com> To: Pierre Beyssac <beyssac@enst.fr> Cc: Bob Willcox <bob@pmr.com>, freebsd-bugs@freebsd.org, FreeBSD-gnats-submit@freebsd.org Subject: Re: kern/10872: Panic in sorecieve() Message-ID: <19990511130004.A29148@luke.pmr.com> In-Reply-To: <19990511195311.R427@enst.fr>; from Pierre Beyssac on Tue, May 11, 1999 at 07:53:11PM %2B0200 References: <19990511185956.A12679@enst.fr> <19990511124117.A28606@luke.pmr.com> <19990511195311.R427@enst.fr>
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On Tue, May 11, 1999 at 07:53:11PM +0200, Pierre Beyssac wrote:
> On Tue, May 11, 1999 at 12:41:17PM -0500, Bob Willcox wrote:
> > fix). The problem as I have seen it is that the mbuf chain pointer (m)
> > is NULL and so_rcv.sb_cc is not zero. Its as though somewhere either
> > the mbuf chain pointer gets zapped with NULL or something fails to
>
> This can happen when the system is out of mbufs. Sadly there are
> many places in the kernel where the condition is not trapped at
> all.
>
> How many mbufs does netstat -m report on your system? Maybe I
> couldn't reproduce it because my kernel is configured with maxusers
> 128, which yields more mbufs. You can try that as a temporary fix.
I have just updated my -current test system (cvsuped as of this morning)
and will see if I can still reproduce it there. If so I will try
changing the maxusers to see if that has any effect.
>
> > properly update so_rcv.sb_cc as mbufs are processed.
> >
> > I believe one can expand the KASSERT macro and rewrite the line:
> > if (m == 0 && so->so_rcv.sb_cc != 0)
>
> Oops, you're right. I stupidly looked at so_snd.sb_cc in the debug
> output, which is 0.
>
> I prefer that, it'll probably be easier to fix.
Good. :-)
> --
> Pierre Beyssac pb@enst.fr
--
Bob Willcox The man who follows the crowd will usually get no
bob@luke.pmr.com further than the crowd. The man who walks alone is
Austin, TX likely to find himself in places no one has ever
been. -- Alan Ashley-Pitt
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