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Date: Sun, 8 Jan 2017 09:52:19 -0800
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: "Andrey V. Elsukov" <bu7cher@yandex.ru>
Cc: Navdeep Parhar <nparhar@gmail.com>, Mike Tancsa <mike@sentex.net>,
 FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>
Subject: Re: coredump when loading cxgb after boot with routing daemon
 already running (RELENG11)
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On Sun, Jan 08, 2017 at 04:22:33PM +0300, Andrey V. Elsukov wrote:
A> On 04.01.2017 22:07, Navdeep Parhar wrote:
A> > What source line in releng-11 does ifioctl+0x6dd correspond to?
A> >
A> > (kgdb) l *(ifioctl+0x6dd)
A> >
A> > This might be race where the ifnet is being created or coming up and
A> > zebra pokes it in some way before it's fully ready.  If that's the
A> > case it could affect any ifnet.
A> 
A> Hi,
A> 
A> from a quick look, it seems that ifnet becomes available for any actions 
A> just after if_alloc() and any strange things can happen in a window 
A> after if_alloc() and before if_attach(). Am I right?

I believe so. That's why in projects/ifnet an interface will be
attached by just if_alloc().

-- 
Totus tuus, Glebius.