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Date: Sat, 12 Jan 2008 02:10:35 +0100
From: Maxime Henrion <mux@FreeBSD.org>
To: Mike Tancsa <mike@sentex.net>
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Cc: cvs-src@freebsd.org, src-committers@freebsd.org, cvs-all@freebsd.org
Subject: Re: cvs commit: src/sys/net route.c route.h
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Mike Tancsa wrote:
> At 10:38 AM 1/9/2008, Maxime Henrion wrote:
> >mux         2008-01-09 15:38:49 UTC
> >
> >  FreeBSD src repository
> >
> >  Modified files:        (Branch: RELENG_6)
> >    sys/net              route.c route.h
> >  Log:
> >  MFC route.c@1.125 and route.h@1.68:
> >    Add a workaround for a deadlock between the rt_setgate() and rt_check()
> >    functions.  It is easily triggered by running routed, and, I expect, by
> >    running any other daemon that uses routing sockets.
> 
> Hi,
>         I have a number of boxes running full bgp tables with 
> Quagga. How does the deadlock manifest itself ? I havent seen the 
> boxes lockup ?  Or does the deadlock create other symptoms ?
> 
>         ---Mike 
> 

It resulted in a hard lockup for us, but it's possible there are other
different outcomes in different scenarios.  For details on the specific
deadlock I have observed, see thread 'Deadlock in the routing code' on
freebsd-net@.

Cheers,
Maxime