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

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Message-ID: <20150708090427.GY3644@twins.programming.kicks-ass.net>
Date:	Wed, 8 Jul 2015 11:04:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arthur Marsh <arthur.marsh@...ernode.on.net>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	rostedt <rostedt@...dmis.org>, 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 Wed, Jul 08, 2015 at 06:01:29PM +0930, Arthur Marsh wrote:
> 
> 
> Peter Zijlstra wrote on 08/07/15 07:41:
> >On Tue, Jul 07, 2015 at 11:56:20PM +0200, Peter Zijlstra wrote:
> 
> >Could you try the below? It appears there was a spot freeing modules
> >that forgot to take them out of the tree.
> >
> >If that fails, try and disable CONFIG_MODULE_UNLOAD.
> 
> I tried the patch below, re-built and installed and booted the kernel and
> saw:
> 
> http://www.users.on.net/~arthur.marsh/20150708471.jpg
> http://www.users.on.net/~arthur.marsh/20150708472.jpg

Ah, that's a lockdep splat, caused by Mathieu's patch. Did the system
boot otherwise?

Maybe take that patch from Mathieu out again.
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