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From: Robert Watson <rwatson@FreeBSD.org>
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To: Maxim Sobolev <sobomax@FreeBSD.org>
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Cc: freebsd-net@freebsd.org, "Bjoern A. Zeeb" <bz@FreeBSD.ORG>,
	Jack Vogel <jfvogel@gmail.com>
Subject: Re: Panic in the udp_input() under heavy load
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On Mon, 7 Nov 2011, Maxim Sobolev wrote:

> On 11/7/2011 3:25 PM, Bjoern A. Zeeb wrote:
>> Now if you are clever you'd also log the inp there as the above will only 
>> prove the case that something is wrong but still not help us in anything to 
>> figure out what.
>
> Good point, thank you Sir.
>
> Would that be good enough?
>
> printf("BZZT! Something is terribly wrong, up == NULL! inp = %p\n", inp);
>
> Do you think of any other useful piece of information that I can log at this 
> point?

Hi Maxim:

There was recently a commit to fix a race condition in 10-CURRENT which I 
think is not slated to be merged for 9.0.  You might check the commit logs 
there and see if that fixes the problems you have -- if so, we might want to 
reconsider the plan not to merge for 9.0.

(It relates to a race condition on closing sockets..)

Robert