linux-kernel - Re: WARNING: at kernel/workqueue.c:1473 __queue

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Date:   Mon, 2 Mar 2020 12:25:10 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     Daniel Jordan <daniel.m.jordan@...cle.com>,
        Will Deacon <will@...nel.org>, tj@...nel.org,
        jiangshanlai@...il.com, mark.rutland@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-crypto@...r.kernel.org
Subject: Re: WARNING: at kernel/workqueue.c:1473 __queue_work+0x3b8/0x3d0

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@...cle.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.
  *
-- 
2.25.1