linux-kernel - Re: [wq:review-wq-mod_delayed] WARNING: at __queue

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Date:	Mon, 30 Jul 2012 11:39:51 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [wq:review-wq-mod_delayed]  WARNING: at __queue_work()

On Sun, Jul 29, 2012 at 01:21:59PM +0800, Fengguang Wu wrote:
> Hi Tejun,
> 
> I got the below warning on
> 
> tree:   git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git review-wq-mod_delayed
> head:   6f510bfa84f26319b1021b9e706ebb814809c4a3
> commit: 54eaaeaa4d2b871c835ff826af5dab3b96f90da0 [4/15] workqueue: disable preemption while manipulating PENDING
> 
> [    0.624901] NET: Registered protocol family 1
> [    0.626536] ------------[ cut here ]------------
> [    0.627849] WARNING: at /c/kernel-tests/src/tip/kernel/workqueue.c:995 __queue_work+0x33/0x1ab()
> [    0.630262] Pid: 1, comm: swapper Not tainted 3.5.0-07346-g54eaaea #1043
> [    0.632100] Call Trace:
> [    0.632803]  [<8102546a>] warn_slowpath_common+0x54/0x69
> [    0.634246]  [<81034e5d>] ? __queue_work+0x33/0x1ab
> [    0.635578]  [<81034e5d>] ? __queue_work+0x33/0x1ab
> [    0.636944]  [<8102551d>] warn_slowpath_null+0x1d/0x20
> [    0.638344]  [<81034e5d>] __queue_work+0x33/0x1ab
> [    0.639632]  [<8103506c>] queue_work_on+0x13/0x1c
> [    0.640945]  [<81035083>] queue_work+0xe/0x10
> [    0.642137]  [<81035136>] queue_delayed_work+0xf/0x22
> [    0.643525]  [<81035642>] schedule_delayed_work+0x11/0x13
> [    0.645038]  [<815a3750>] sunrpc_init_cache_detail+0x7f/0x82
> [    0.646579]  [<815a3db6>] cache_register_net+0x8/0xc
> [    0.647941]  [<815a0520>] ip_map_cache_create+0x34/0x56
> [    0.649399]  [<81ac0ffe>] sunrpc_init_net+0x73/0xce
> [    0.650743]  [<81ac0f8b>] ? init_sunrpc+0x5f/0x5f
> [    0.652049]  [<814f3bba>] ops_init.constprop.5+0xc5/0xeb
> [    0.653510]  [<814f3c34>] register_pernet_operations.isra.2+0x54/0x7d
> [    0.655325]  [<81ac0f2c>] ? rpc_init_generic_auth+0xf/0xf
> [    0.656821]  [<814f3dbb>] register_pernet_subsys+0x19/0x2a
> [    0.658316]  [<81ac0f55>] init_sunrpc+0x29/0x5f
> [    0.659555]  [<81a879cb>] do_one_initcall+0x7e/0x129
> [    0.660936]  [<81a87b59>] kernel_init+0xe3/0x17a
> [    0.662205]  [<81a87435>] ? do_early_param+0x7a/0x7a
> [    0.663574]  [<81a87a76>] ? do_one_initcall+0x129/0x129
> [    0.665038]  [<81652f36>] kernel_thread_helper+0x6/0xd

The WARN_ON should have been on preemptible() instead of directly on
preempt_count(); otherwise, with !CONFIG_PREEMPT_COUNT, the condition
triggers spuriously.  Will fix.

Thanks a lot for the report.

-- 
tejun
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