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Date:      Fri, 13 Mar 1998 03:04:08 -0800
From:      David Greenman <dg@root.com>
To:        Reinier Bezuidenhout <rbezuide@oskar.nanoteq.co.za>
Cc:        freebsd-hackers@FreeBSD.ORG
Subject:   Re: 2.2.5 PANIC when out of mbufs 
Message-ID:  <199803131104.DAA21385@implode.root.com>
In-Reply-To: Your message of "Sat, 13 Mar 1998 12:31:13 %2B0200." <199803131032.MAA04804@oskar.nanoteq.co.za> 

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>(m) = m_retryhdr((how), (type)); which has now been defined as 0x0 ...
>MGETHDR (with M_WAIT) defined now happily returns m = 0x0 and no 
>one checks for that.
>
>It then causes the kernel to panic.
>
>:) would it not have been easier to call panic from withing the else
>in m_retryhdr :) instead of waiting for the mbuf to be referenced :)
>
>Am I missing anything obvious here ???

   It's a problem that has been known about for a couple of years. It's one
possible effect of running out of mbuf clusters - there are others.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project

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