linux-kernel - Re: [LKP] [mm/slub] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1

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Date:	Thu, 22 Jan 2015 10:55:48 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [mm/slub] BUG: using smp_processor_id() in preemptible
 [00000000] code: swapper/0/1

On Wed, Jan 21, 2015 at 12:38:35PM +0800, Huang Ying wrote:
> FYI, we noticed the below changes on
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> commit d2dc80750ee05ceb03c9b13b0531a782116d1ade ("mm/slub: optimize alloc/free fastpath by removing preemption on/off")
> 
> 
> +-------------------------------------------------------------+------------+------------+
> |                                                             | 8e32336269 | d2dc80750e |
> +-------------------------------------------------------------+------------+------------+
> | boot_successes                                              | 8          | 4          |
> | boot_failures                                               | 2          | 16         |
> | WARNING:at_net/netlink/genetlink.c:#genl_unbind()           | 2          | 5          |
> | backtrace:do_group_exit                                     | 2          | 5          |
> | backtrace:SyS_exit_group                                    | 2          | 5          |
> | BUG:using_smp_processor_id()in_preemptible[#]code:swapper   | 0          | 6          |
> | backtrace:getname_kernel                                    | 0          | 6          |
> | backtrace:run_init_process                                  | 0          | 6          |
> | backtrace:do_execve                                         | 0          | 6          |
> | BUG:using_smp_processor_id()in_preemptible[#]code:init      | 0          | 1          |
> | backtrace:vfs_stat                                          | 0          | 1          |
> | backtrace:SyS_stat64                                        | 0          | 1          |
> | BUG:using_smp_processor_id()in_preemptible[#]code:kdevtmpfs | 0          | 5          |
> | backtrace:devtmpfsd                                         | 0          | 5          |
> | backtrace:security_inode_alloc                              | 0          | 5          |
> | backtrace:inode_init_always                                 | 0          | 5          |
> +-------------------------------------------------------------+------------+------------+
> 

Hello,

I already sent the patch to fix the problem.

https://lkml.org/lkml/2015/1/19/17

Thanks for reporting.

Thanks.
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