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Date:      Fri, 01 Jul 2005 16:32:38 -0400
From:      Gary Mu1der <gmulder@infotechfl.com>
To:        Gleb Smirnoff <glebius@freebsd.org>
Cc:        freebsd-stable@freebsd.org
Subject:   Re: panic in RELENG_5 UMA - two new stack traces
Message-ID:  <42C5A866.1010409@infotechfl.com>
In-Reply-To: <20050701201308.GD59610@cell.sick.ru>
References:  <20050621090701.GB34406@cell.sick.ru>	<20050621105154.GA36538@cell.sick.ru>	<42B961B9.7A5856B3@freebsd.org>	<20050623104230.GB61389@cell.sick.ru>	<20050623141514.GD738@obiwan.tataz.chchile.org>	<42BC5EE2.2020003@infotechfl.com>	<20050627082958.GB97832@cell.sick.ru>	<42C16BBF.4060107@infotechfl.com>	<20050701085808.GD52023@cell.sick.ru>	<42C58373.60008@infotechfl.com> <20050701201308.GD59610@cell.sick.ru>

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Gleb Smirnoff wrote:
> G> I can reproduce the crash within 60 seconds of firing off 30+ ping/arp 
> G> -d scripts, all running in parallel.
> G> 
> G> debug.mpsafenet=0 seems to have solved the problem. I'm running 100+ 
> G> instances of the above script and the system has been stable for over an 
> G> hour.
> 
> Thanks! We definitely see that the bug is a race, not a broken logic. I am
> almost sure, that you are experiencing the same bug as I described in
> the beginning of the thread.
> 
> Although there is no yet fix available for race between 'arp -d' and
> outgoing packet, there is one for race between incoming ARP reply and
> outgoing packet. We will probably commit it soon, after more review.

Is this bug specific to only using "arp -d", or does it look like the 
"arp -d" tests identify a bug that might cause TCP/IP related crashes 
with other types of real-world network traffic.

To rephrase: Does it look like fixing this bug may fix a lot of the 
network-related crashes a number of people have reported?

Thanks,
Gary



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