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Re: kern/42248: in_cksum: out of data

The following reply was made to PR kern/42248; it has been noted by GNATS.

From: David Holland <>
Subject: Re: kern/42248: in_cksum: out of data
Date: Mon, 14 Dec 2009 02:46:07 +0000

 On Fri, Oct 30, 2009 at 09:30:00AM +0000, wrote:
  > Obviously this is highly reproducible and I'm willing to add any
  > instrumentation that might help to identify the cause.
  > Oct 29 17:11:46 build /netbsd: in_cksum: out of data
 This message is caused by cpu_in_cksum (in netinet/cpu_in_cksum.c)
 running off the end of its mbuf chain.
 Changing the printf to a panic (or breaking in the debugger or
 whatever) and seeing where it's coming from might be illuminating.
 Given how regular it is, it's probably triggered by something external.
  > Run ntpd(8), dhcpd(8), openvpn and transmission-daemon.
 ...although it could also be dhcp.
 David A. Holland

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