11.0 stuck on high network load

[hiren panchasara]

On 09/16/16 at 09:18P, Slawa Olhovchenkov wrote:
> On Thu, Sep 15, 2016 at 12:06:33PM +0300, Slawa Olhovchenkov wrote:
> 
> > On Thu, Sep 15, 2016 at 11:59:38AM +0300, Konstantin Belousov wrote:
> > 
> > > 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:
> > > > 
> > > > > 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?
> > > > > 
> > > > > Can you panic it from console to get to db> to get backtrace and other
> > > > > info when it goes unresponsive?
> > > > 
> > > > ipmi console don't respond (chassis power diag don't react)
> > > > login on sol console stuck on *tcp.
> > > 
> > > Is 'login' you reference is the ipmi client state, or you mean login(1)
> > > on the wedged host ?
> > 
> > on the wedged host
> > 
> > > If BMC stops responding simultaneously with the host, I would suspect
> > > the hardware platform issues instead of a software problem.  Do you have
> > > dedicated LAN port for BMC ?
> > 
> > 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).
> 
> ~^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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