linux-kernel - [LKP] [rhashtable] WARNING: CPU: 0 PID: 1 at lib/debugobjects.c:301 __debug_object

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Date:	Wed, 07 Jan 2015 10:30:09 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Thomas Graf <tgraf@...g.ch>
Cc:	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [rhashtable] WARNING: CPU: 0 PID: 1 at lib/debugobjects.c:301
 __debug_object_init+0x3e7/0x4a3()

FYI, we noticed the below changes on

git://flatbed.openfabrics.org/~amirv/linux.git for-upstream
commit 97defe1ecf868b8127f8e62395499d6a06e4c4b1 ("rhashtable: Per bucket locks & deferred expansion/shrinking")

Because there are OOM for this commit and its parent commit, I am not sure whether this warning is related
to your commit.  One possibility, the workqueue is tracked with debugobjects, while the commit is working
on a workqueue.

+------------------------------------------------------------------+------------+------------+
|                                                                  | 113948d841 | 97defe1ecf |
+------------------------------------------------------------------+------------+------------+
| boot_successes                                                   | 0          | 0          |
| boot_failures                                                    | 10         | 10         |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 10         | 10         |
| backtrace:do_fork                                                | 5          |            |
| backtrace:lock_torture_stats                                     | 4          | 10         |
| backtrace:pcpu_balance_workfn                                    | 1          |            |
| WARNING:at_lib/debugobjects.c:#__debug_object_init()             | 0          | 10         |
| backtrace:__debug_object_init                                    | 0          | 10         |
| backtrace:warn_slowpath_null                                     | 0          | 10         |
| backtrace:debug_object_init                                      | 0          | 10         |
| backtrace:__init_work                                            | 0          | 10         |
| backtrace:rhashtable_init                                        | 0          | 10         |
| backtrace:test_rht_init                                          | 0          | 10         |
| backtrace:kernel_init_freeable                                   | 0          | 10         |
| backtrace:init_timer_key                                         | 0          | 10         |
+------------------------------------------------------------------+------------+------------+


[    0.412102] Running resizable hashtable tests...
[    0.413071] ODEBUG: object is on stack, but not annotated
[    0.414124] ------------[ cut here ]------------
[    0.415116] WARNING: CPU: 0 PID: 1 at lib/debugobjects.c:301 __debug_object_init+0x3e7/0x4a3()
[    0.417178] Modules linked in:
[    0.418107] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc2-00457-g104bea1 #170
[    0.419767] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.420000]  0000000000000009 ffff880013cc3b38 ffffffff81963311 0000000000000cfc
[    0.420000]  0000000000000000 ffff880013cc3b78 ffffffff8107e830 ffff880013cc3b98
[    0.420000]  ffffffff8144e054 ffff880013cc3d40 ffffffff837be688 ffff880013c4fbf8
[    0.420000] Call Trace:
[    0.420000]  [<ffffffff81963311>] dump_stack+0xa0/0xd5
[    0.420000]  [<ffffffff8107e830>] warn_slowpath_common+0xc8/0xf7
[    0.420000]  [<ffffffff8144e054>] ? __debug_object_init+0x3e7/0x4a3
[    0.420000]  [<ffffffff8107e882>] warn_slowpath_null+0x23/0x2c
[    0.420000]  [<ffffffff8144e054>] __debug_object_init+0x3e7/0x4a3
[    0.420000]  [<ffffffff8144e132>] debug_object_init+0x22/0x2b
[    0.420000]  [<ffffffff81099a82>] __init_work+0x37/0x40
[    0.420000]  [<ffffffff8144708b>] rhashtable_init+0x19a/0x239
[    0.420000]  [<ffffffff810c68ad>] ? up+0x50/0x5c
[    0.420000]  [<ffffffff826e248e>] ? test_rht_lookup+0x11b/0x11b
[    0.420000]  [<ffffffff826e2534>] test_rht_init+0xa6/0x593
[    0.420000]  [<ffffffff8144673c>] ? __roundup_pow_of_two+0x21/0x21
[    0.420000]  [<ffffffff814468ee>] ? jhash+0x1b2/0x1b2
[    0.420000]  [<ffffffff8144690d>] ? rht_grow_above_75+0x1f/0x1f
[    0.420000]  [<ffffffff8144673c>] ? __roundup_pow_of_two+0x21/0x21
[    0.420000]  [<ffffffff814468ee>] ? jhash+0x1b2/0x1b2
[    0.420000]  [<ffffffff8144690d>] ? rht_grow_above_75+0x1f/0x1f
[    0.420000]  [<ffffffff826e248e>] ? test_rht_lookup+0x11b/0x11b
[    0.420000]  [<ffffffff8100041a>] do_one_initcall+0x190/0x266
[    0.420000]  [<ffffffff826ad9e4>] kernel_init_freeable+0x37e/0x480
[    0.420000]  [<ffffffff8195a525>] ? rest_init+0x21b/0x21b
[    0.420000]  [<ffffffff8195a535>] kernel_init+0x10/0x175
[    0.420000]  [<ffffffff8197253c>] ret_from_fork+0x7c/0xb0
[    0.420000]  [<ffffffff8195a525>] ? rest_init+0x21b/0x21b
[    0.420000] ---[ end trace 77992957a24f572d ]---
[    0.420010] ODEBUG: object is on stack, but not annotated



Thanks,
Huang, Ying




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