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

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Date:	Wed, 08 Jul 2015 18:01:29 +0930
From:	Arthur Marsh <arthur.marsh@...ernode.on.net>
To:	Peter Zijlstra <peterz@...radead.org>
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



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

I'm now rebuilding the kernel with CONFIG_MODULE_UNLOAD disabled.

Arthur.

>
> ---
>   kernel/module.c | 1 +
>   1 file changed, 1 insertion(+)
>
> diff --git a/kernel/module.c b/kernel/module.c
> index 3e0e19763d24..4d2b82e610e2 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -3557,6 +3557,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
>   	mutex_lock(&module_mutex);
>   	/* Unlink carefully: kallsyms could be walking list. */
>   	list_del_rcu(&mod->list);
> +	mod_tree_remove(mod);
>   	wake_up_all(&module_wq);
>   	/* Wait for RCU-sched synchronizing before releasing mod->list. */
>   	synchronize_sched();
>
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