Re: WARNING: at kernel/workqueue.c:1473 __queue_work+0x3b8/0x3d0

From: Corentin Labbe <clabbe.montjoie@gmail.com>
To: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: mark.rutland@arm.com, jiangshanlai@gmail.com,
	linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org,
	tj@kernel.org, Will Deacon <will@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: WARNING: at kernel/workqueue.c:1473 __queue_work+0x3b8/0x3d0
Date: Tue, 3 Mar 2020 08:48:19 +0100	[thread overview]
Message-ID: <20200303074819.GB9935@Red> (raw)
In-Reply-To: <20200302172510.fspofleipqjcdxak@ca-dmjordan1.us.oracle.com>

On Mon, Mar 02, 2020 at 12:25:10PM -0500, Daniel Jordan wrote:
> On Sun, Mar 01, 2020 at 06:53:51PM +0100, Corentin Labbe wrote:
> > I tried to bisect this problem, but the result is:
> ...
> > # first bad commit: [81ff5d2cba4f86cd850b9ee4a530cd221ee45aa3] Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
> > 
> > The only interesting thing I see in this MR is: "Add fuzz testing to testmgr"
> > 
> > But this wont help.
> 
> Hm, that merge commit has only a couple lines of powerpc build change, so maybe
> there's something nondeterministic going on.
> 
> Does this fix it?  I can't verify but figure it's worth trying the simplest
> explanation first, which is that the work isn't initialized by the time it's
> queued.
> 
> thanks,
> daniel
> 
> ---8<---
> 
> Subject: [PATCH] module: statically initialize init section freeing data
> 
> Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
> ---
>  kernel/module.c | 13 +++----------
>  1 file changed, 3 insertions(+), 10 deletions(-)
> 
> diff --git a/kernel/module.c b/kernel/module.c
> index 33569a01d6e1..db0cda206167 100644
> --- a/kernel/module.c
> +++ b/kernel/module.c
> @@ -88,8 +88,9 @@ EXPORT_SYMBOL_GPL(module_mutex);
>  static LIST_HEAD(modules);
>  
>  /* Work queue for freeing init sections in success case */
> -static struct work_struct init_free_wq;
> -static struct llist_head init_free_list;
> +static void do_free_init(struct work_struct *w);
> +static DECLARE_WORK(init_free_wq, do_free_init);
> +static LLIST_HEAD(init_free_list);
>  
>  #ifdef CONFIG_MODULES_TREE_LOOKUP
>  
> @@ -3501,14 +3502,6 @@ static void do_free_init(struct work_struct *w)
>  	}
>  }
>  
> -static int __init modules_wq_init(void)
> -{
> -	INIT_WORK(&init_free_wq, do_free_init);
> -	init_llist_head(&init_free_list);
> -	return 0;
> -}
> -module_init(modules_wq_init);
> -
>  /*
>   * This is where the real work happens.
>   *

Hello

The patch fix the issue. Thanks!

So you could add:
Reported-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Tested-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Tested-on: sun50i-h6-pine-h64
Tested-on: imx8mn-ddr4-evk
Tested-on: sun50i-a64-bananapi-m64

Thanks again
Regards

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