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

Thanks,
Fengguang