linux-kernel - [lkp] [of/platform] 7ec0126d70: WARNING: CPU: 0 PID: 1 at fs/kernfs/dir.c:1253 kernfs_remove_by_name

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Date:	Sat, 22 Aug 2015 21:28:55 +0800
From:	kernel test robot <ying.huang@...el.com>
TO:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [of/platform] 7ec0126d70: WARNING: CPU: 0 PID: 1 at
 fs/kernfs/dir.c:1253 kernfs_remove_by_name_ns+0x74/0x80()

FYI, we noticed the below changes on

git://git.collabora.co.uk/git/user/tomeu/linux.git on-demand-probes-v6
commit 7ec0126d70e7cf5029b717f3b3ecf48ee1d17930 ("of/platform: Point to struct device from device node")


+--------------------------------------------------------+------------+------------+
|                                                        | 2ffbf1ddf7 | 7ec0126d70 |
+--------------------------------------------------------+------------+------------+
| boot_successes                                         | 101        | 0          |
| boot_failures                                          | 10         | 21         |
| IP-Config:Auto-configuration_of_network_failed         | 10         | 10         |
| WARNING:at_fs/kernfs/dir.c:#kernfs_remove_by_name_ns() | 0          | 21         |
| backtrace:of_unittest                                  | 0          | 21         |
| backtrace:kernel_init_freeable                         | 0          | 21         |
| WARNING:at_lib/kobject.c:#kobject_put()                | 0          | 7          |
| BUG:unable_to_handle_kernel                            | 0          | 7          |
| Oops                                                   | 0          | 7          |
| EIP_is_at_of_platform_device_destroy                   | 0          | 7          |
| Kernel_panic-not_syncing:Fatal_exception               | 0          | 7          |
+--------------------------------------------------------+------------+------------+


[    5.232210] ### dt-test ### FAIL of_unittest_platform_populate():812 device didn't get destroyed 'dev'
[    5.232926] ### dt-test ### FAIL of_unittest_platform_populate():812 device didn't get destroyed 'dev'
[    5.235261] ------------[ cut here ]------------
[    5.235631] WARNING: CPU: 0 PID: 1 at fs/kernfs/dir.c:1253 kernfs_remove_by_name_ns+0x74/0x80()
[    5.236451] kernfs: can not remove 'driver', no directory
[    5.236864] CPU: 0 PID: 1 Comm: swapper Tainted: G S              4.2.0-rc6-next-20150810-00011-g7ec0126 #1
[    5.237610]  94437cb8 94437cb8 94437c8c 81cc5f20 94437ca8 8103fc40 000004e5 811311b4
[    5.238300]  00000000 8209cf55 823f45c0 94437cc0 8103fcc6 00000009 94437cb8 820aaf54
[    5.238969]  94437cd4 94437ce4 811311b4 820aaecc 000004e5 820aaf54 8209cf55 8d26c014
[    5.239662] Call Trace:
[    5.239859]  [<81cc5f20>] dump_stack+0x16/0x18
[    5.240215]  [<8103fc40>] warn_slowpath_common+0x60/0x90
[    5.240623]  [<811311b4>] ? kernfs_remove_by_name_ns+0x74/0x80
[    5.241073]  [<8103fcc6>] warn_slowpath_fmt+0x26/0x30
[    5.241469]  [<811311b4>] kernfs_remove_by_name_ns+0x74/0x80
[    5.241898]  [<811330a1>] sysfs_remove_link+0x11/0x30
[    5.242310]  [<81707ba8>] driver_sysfs_remove+0x28/0x30
[    5.242710]  [<81707c62>] __device_release_driver+0x32/0xf0
[    5.243141]  [<817084aa>] device_release_driver+0x1a/0x30
[    5.243564]  [<8170705b>] bus_remove_device+0xbb/0xf0
[    5.243948]  [<81704c5c>] device_del+0xec/0x1e0
[    5.244312]  [<81cc1e01>] ? klist_next+0x101/0x110
[    5.244684]  [<81709a14>] platform_device_del+0x14/0xa0
[    5.245092]  [<81709acb>] platform_device_unregister+0xb/0x20
[    5.245547]  [<81af1d18>] of_platform_device_destroy+0x68/0x70
[    5.245991]  [<81af2267>] of_platform_notify+0xc7/0x100
[    5.246408]  [<8105753a>] notifier_call_chain+0x2a/0x90
[    5.246805]  [<810578aa>] __blocking_notifier_call_chain+0x2a/0x50
[    5.247289]  [<810578dc>] blocking_notifier_call_chain+0xc/0x10
[    5.247738]  [<81af282e>] of_property_notify+0x2e/0x60
[    5.248144]  [<81af2891>] __of_changeset_entry_notify+0x31/0xc0
[    5.248615]  [<81af3039>] of_changeset_apply+0x49/0xa0
[    5.249017]  [<81af69da>] ? of_overlay_apply_one+0xba/0x210
[    5.249453]  [<81af6d4a>] of_overlay_create+0x1ba/0x330
[    5.249851]  [<81ccd483>] of_unittest_apply_overlay+0x8a/0xf8
[    5.250349]  [<81ccd57b>] of_unittest_apply_overlay_check+0x8a/0x10d
[    5.250840]  [<82529b39>] of_unittest+0x19a4/0x21d1
[    5.251242]  [<810cf7e7>] ? slob_free+0xd7/0x430
[    5.251598]  [<82528195>] ? of_unittest_check_tree_linkage+0x81/0x81
[    5.252135]  [<82528195>] ? of_unittest_check_tree_linkage+0x81/0x81
[    5.252670]  [<824e7b2b>] do_one_initcall+0xcb/0x14d
[    5.253055]  [<824e74c5>] ? repair_env_string+0x12/0x54
[    5.253463]  [<8105645c>] ? parse_args+0x1bc/0x3c0
[    5.253829]  [<824e7c6b>] ? kernel_init_freeable+0xbe/0x15b
[    5.254278]  [<824e7c8b>] kernel_init_freeable+0xde/0x15b
[    5.254694]  [<81cc1ec8>] kernel_init+0x8/0xc0
[    5.255044]  [<81cd2ec0>] ret_from_kernel_thread+0x20/0x30
[    5.255467]  [<81cc1ec0>] ? rest_init+0xb0/0xb0
[    5.255814] ---[ end trace 9fe8dc290cc801c7 ]---
[    5.256199] ### dt-test ### FAIL of_unittest_apply_overlay_check():1226 overlay @"/testcase-data/overlay1" failed to create @"/testcase-data/overlay-node/test-bus/test-unittest1" enabled



Thanks,
Ying Huang

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