linux-kernel - Re: lock-up with module: Optimize __module

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Message-ID: <20150706075746.GR18673@twins.programming.kicks-ass.net>
Date:	Mon, 6 Jul 2015 09:57:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arthur Marsh <arthur.marsh@...ernode.on.net>
Cc:	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: lock-up with module: Optimize __module_address() using a latched
 RB-tree

On Mon, Jul 06, 2015 at 09:19:11AM +0200, Peter Zijlstra wrote:
> On Mon, Jul 06, 2015 at 04:03:45AM +0930, Arthur Marsh wrote:
> > I am happy to supply further details and run further tests.
> 
> A .config and gcc version might be a good start. I'll see if 32bit
> userspace in KVM can reproduce.

So I build i386_defconfig and i386_defconfig + CONFIG_SMP=n, installed
them in an old gentoo-stage3 userland diskimage and booted it with KVM
with only a single CPU, both booted just fine. Then I loaded a module
(iptable_nat) and that too worked on both.

So I'm a bit at a loss and will need more details.

Sadly I do not have access to AMD hardware of that vintage.
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