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Date:      Fri, 16 Sep 2016 11:30:53 -0700
From:      hiren panchasara <hiren@strugglingcoder.info>
To:        Slawa Olhovchenkov <slw@zxy.spb.ru>
Cc:        Konstantin Belousov <kostikbel@gmail.com>, freebsd-stable@FreeBSD.org
Subject:   Re: 11.0 stuck on high network load
Message-ID:  <20160916183053.GL9397@strugglingcoder.info>
In-Reply-To: <20160916181839.GC2960@zxy.spb.ru>
References:  <20160904215739.GC22212@zxy.spb.ru> <20160905014612.GA42393@strugglingcoder.info> <20160914213503.GJ2840@zxy.spb.ru> <20160915085938.GN38409@kib.kiev.ua> <20160915090633.GS2840@zxy.spb.ru> <20160916181839.GC2960@zxy.spb.ru>

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On 09/16/16 at 09:18P, Slawa Olhovchenkov wrote:
> On Thu, Sep 15, 2016 at 12:06:33PM +0300, Slawa Olhovchenkov wrote:
>=20
> > On Thu, Sep 15, 2016 at 11:59:38AM +0300, Konstantin Belousov wrote:
> >=20
> > > On Thu, Sep 15, 2016 at 12:35:04AM +0300, Slawa Olhovchenkov wrote:
> > > > On Sun, Sep 04, 2016 at 06:46:12PM -0700, hiren panchasara wrote:
> > > >=20
> > > > > On 09/05/16 at 12:57P, Slawa Olhovchenkov wrote:
> > > > > > I am try using 11.0 on Dual E5-2620 (no X2APIC).
> > > > > > Under high network load and may be addtional conditional system=
 go to
> > > > > > unresponsible state -- no reaction to network and console (USB =
IPMI
> > > > > > emulation). INVARIANTS give to high overhad. Is this exist some=
 way to
> > > > > > debug this?
> > > > >=20
> > > > > Can you panic it from console to get to db> to get backtrace and =
other
> > > > > info when it goes unresponsive?
> > > >=20
> > > > ipmi console don't respond (chassis power diag don't react)
> > > > login on sol console stuck on *tcp.
> > >=20
> > > Is 'login' you reference is the ipmi client state, or you mean login(=
1)
> > > on the wedged host ?
> >=20
> > on the wedged host
> >=20
> > > If BMC stops responding simultaneously with the host, I would suspect
> > > the hardware platform issues instead of a software problem.  Do you h=
ave
> > > dedicated LAN port for BMC ?
> >=20
> > Yes.
> > But BMC emulate USB keyboard and this is may be lock inside USB
> > system.
> > "ipmi console don't respond" must be read as "ipmi console runnnig and
> > attached but system don't react to keypress on this console".
> > at the sime moment system respon to `enter` on ipmi sol console, but
> > after enter `root` stuck in login in the '*tcp' state (I think this is
> > NIS related).
>=20
> ~^B don't break to debuger.
> But I can login to sol console.

You can probably:
debug.kdb.enter: set to enter the debugger

or force a panic and get vmcore:
debug.kdb.panic: set to panic the kernel

Cheers,
Hiren

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