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Date: Fri, 17 Mar 2017 12:57:50 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: Logan Gunthorpe <logang@...tatee.com>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org,
rtc-linux@...glegroups.com,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
wfg@...ux.intel.com
Subject: [rtc] 4cd8adb100: WARNING: CPU: 0 PID: 1 at lib/kobject.c:690
kobject_put
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-testing
commit 4cd8adb100107dc44e63615040ca2bde43de6167
Author: Logan Gunthorpe <logang@...tatee.com>
AuthorDate: Mon Mar 6 00:04:30 2017 -0700
Commit: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CommitDate: Fri Mar 17 09:20:18 2017 +0900
rtc: utilize new cdev_device_add helper function
Mostly straightforward, but we had to remove the rtc_dev_add/del_device
functions as they split up the cdev_add and the device_add.
Doing this also revealed that there was likely another subtle bug:
seeing cdev_add was done after device_register, the cdev probably
was not ready before device_add when the uevent occurs. This would
race with userspace, if it tried to use the device directly after
the uevent. This is fixed just by using the new helper function.
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
c65bbfc122 rapidio: utilize new cdev_device_add helper function
4cd8adb100 rtc: utilize new cdev_device_add helper function
64d77f61c0 auxdisplay: Add HD44780 Character LCD support
+-----------------------------------------------------+------------+------------+------------+
| | c65bbfc122 | 4cd8adb100 | 64d77f61c0 |
+-----------------------------------------------------+------------+------------+------------+
| boot_successes | 4 | 0 | 0 |
| boot_failures | 55 | 26 | 30 |
| WARNING:at_arch/x86/mm/dump_pagetables.c:#note_page | 55 | 22 | 24 |
| WARNING:at_lib/kobject.c:#kobject_put | 0 | 26 | 30 |
| WARNING:at_lib/refcount.c:#refcount_sub_and_test | 0 | 26 | 30 |
+-----------------------------------------------------+------------+------------+------------+
[ 1.261325] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
[ 1.263029] wistron_btns: System unknown
[ 1.263411] usbcore: registered new interface driver yealink
[ 1.264581] rtc-test rtc-test.0: rtc core: registered test as rtc0
[ 1.265355] ------------[ cut here ]------------
[ 1.265798] WARNING: CPU: 0 PID: 1 at lib/kobject.c:690 kobject_put+0x39/0x60
[ 1.266539] kobject: '(null)' (cea81ab4): is not initialized, yet kobject_put() is being called.
[ 1.267291] Modules linked in:
[ 1.267562] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.11.0-rc2-00049-g4cd8adb #834
[ 1.268236] Call Trace:
[ 1.268453] dump_stack+0x76/0xa9
[ 1.268740] __warn+0xdb/0x100
[ 1.269005] ? kobject_put+0x39/0x60
[ 1.269318] warn_slowpath_fmt+0x36/0x40
[ 1.269653] kobject_put+0x39/0x60
[ 1.269948] cdev_del+0x1d/0x20
[ 1.270224] cdev_device_del+0x14/0x20
[ 1.270548] rtc_device_unregister+0x2a/0x50
[ 1.270913] devm_rtc_device_release+0xa/0x10
[ 1.271291] release_nodes+0x1e4/0x210
[ 1.271613] devres_release_all+0x51/0x60
[ 1.271962] driver_probe_device+0x237/0x480
[ 1.272332] ? klist_next+0x1b/0xc0
[ 1.272633] ? acpi_driver_match_device+0x49/0x62
[ 1.273034] __device_attach_driver+0xe8/0x110
[ 1.273418] ? klist_next+0x9d/0xc0
[ 1.273718] ? __driver_attach+0xf0/0xf0
[ 1.274053] bus_for_each_drv+0x44/0x80
[ 1.274389] __device_attach+0x9d/0x140
[ 1.274718] ? __driver_attach+0xf0/0xf0
[ 1.275054] device_initial_probe+0xd/0x10
[ 1.275409] bus_probe_device+0x25/0x80
[ 1.275738] device_add+0x3fc/0x5c0
[ 1.276038] ? kobject_set_name_vargs+0x7f/0xa0
[ 1.276428] platform_device_add+0x1d9/0x250
[ 1.276793] test_init+0x52/0xa6
[ 1.277085] ? stk17ta8_rtc_driver_init+0x11/0x11
[ 1.277504] do_one_initcall+0x92/0x160
[ 1.277844] ? parameq+0x13/0x70
[ 1.278138] ? repair_env_string+0x12/0x51
[ 1.278500] ? parse_args+0x325/0x470
[ 1.278826] ? __usermodehelper_set_disable_depth+0x3e/0x50
[ 1.279318] kernel_init_freeable+0xfb/0x19a
[ 1.279696] ? do_early_param+0x7a/0x7a
[ 1.280036] ? rest_init+0x130/0x130
[ 1.280359] kernel_init+0xb/0x100
[ 1.280665] ? schedule_tail+0xc/0x60
[ 1.280991] ? rest_init+0x130/0x130
[ 1.281314] ret_from_fork+0x21/0x2c
[ 1.281706] ---[ end trace e98f47d52e9cf212 ]---
[ 1.282142] ------------[ cut here ]------------
[ 1.282142] ------------[ cut here ]------------
[ 1.282555] WARNING: CPU: 0 PID: 1 at lib/refcount.c:128 refcount_sub_and_test+0x55/0xa0
[ 1.283396] refcount_t: underflow; use-after-free.
[ 1.283829] Modules linked in:
[ 1.284110] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 4.11.0-rc2-00049-g4cd8adb #834
[ 1.284904] Call Trace:
[ 1.285120] dump_stack+0x76/0xa9
[ 1.285412] __warn+0xdb/0x100
[ 1.285678] ? refcount_sub_and_test+0x55/0xa0
[ 1.286071] warn_slowpath_fmt+0x36/0x40
[ 1.286423] refcount_sub_and_test+0x55/0xa0
[ 1.286801] refcount_dec_and_test+0xf/0x20
[ 1.287177] kobject_put+0x41/0x60
[ 1.287480] cdev_del+0x1d/0x20
[ 1.287760] cdev_device_del+0x14/0x20
[ 1.288101] rtc_device_unregister+0x2a/0x50
[ 1.288474] devm_rtc_device_release+0xa/0x10
[ 1.288848] release_nodes+0x1e4/0x210
[ 1.289174] devres_release_all+0x51/0x60
[ 1.289518] driver_probe_device+0x237/0x480
[ 1.289898] ? klist_next+0x1b/0xc0
[ 1.290214] ? acpi_driver_match_device+0x49/0x62
[ 1.290628] __device_attach_driver+0xe8/0x110
[ 1.291021] ? klist_next+0x9d/0xc0
[ 1.291336] ? __driver_attach+0xf0/0xf0
[ 1.291684] bus_for_each_drv+0x44/0x80
[ 1.292024] __device_attach+0x9d/0x140
[ 1.292369] ? __driver_attach+0xf0/0xf0
[ 1.292717] device_initial_probe+0xd/0x10
[ 1.293086] bus_probe_device+0x25/0x80
[ 1.293421] device_add+0x3fc/0x5c0
[ 1.293722] ? kobject_set_name_vargs+0x7f/0xa0
[ 1.294129] platform_device_add+0x1d9/0x250
[ 1.294510] test_init+0x52/0xa6
[ 1.294799] ? stk17ta8_rtc_driver_init+0x11/0x11
[ 1.295217] do_one_initcall+0x92/0x160
[ 1.295559] ? parameq+0x13/0x70
[ 1.295859] ? repair_env_string+0x12/0x51
[ 1.296215] ? parse_args+0x325/0x470
[ 1.296532] ? __usermodehelper_set_disable_depth+0x3e/0x50
[ 1.297006] kernel_init_freeable+0xfb/0x19a
[ 1.297378] ? do_early_param+0x7a/0x7a
[ 1.297708] ? rest_init+0x130/0x130
[ 1.298030] kernel_init+0xb/0x100
[ 1.298342] ? schedule_tail+0xc/0x60
[ 1.298668] ? rest_init+0x130/0x130
[ 1.298987] ret_from_fork+0x21/0x2c
[ 1.299379] ---[ end trace e98f47d52e9cf213 ]---
[ 1.299887] rtc-test rtc-test.0: rtc core: registered test as rtc1
# HH:MM RESULT GOOD BAD GOOD_BUT_DIRTY DIRTY_NOT_BAD
git bisect start 472b8db0e353bce9af369f566db55ab626922906 4495c08e84729385774601b5146d51d9e5849f81 --
git bisect good 83f311c4f0a8a406485c034038d1eebb61467e06 # 10:15 G 11 0 11 11 Merge 'pm/linux-next' into devel-catchup-201703170914
git bisect good dba0cafd19396fe23ef3688ce9f18e9a6cf12d11 # 10:28 G 11 0 11 11 Merge 'linux-review/Michael-Davidson/crypto-x86-aesni-fix-token-pasting-for-clang/20170317-082713' into devel-catchup-201703170914
git bisect bad 533e610f1350246901b978d58268816bbbedee83 # 10:42 B 0 11 22 0 Merge 'linux-review/John-Keeping/Bluetooth-hci_bcm-Fix-clock-un-prepare/20170317-081003' into devel-catchup-201703170914
git bisect bad a44dae33e154bb3727f7758ffe858a69c42e8ecb # 10:57 B 0 11 22 0 Merge 'char-misc/char-misc-testing' into devel-catchup-201703170914
git bisect good def32a359b666d8d577e4c5884e0918f7ff5ba2e # 11:09 G 11 0 11 11 docs: Update VME documentation to include kerneldoc comments
git bisect good f51de2acbb7facde8fb855c73fb9edd60cf3055e # 11:20 G 11 0 11 11 platform/chrome: cros_ec_dev - utilize new cdev_device_add helper function
git bisect bad 4cd8adb100107dc44e63615040ca2bde43de6167 # 11:29 B 0 11 32 10 rtc: utilize new cdev_device_add helper function
git bisect good dafa63cd90cd13262cb995a27c3c79eb3fda4655 # 11:49 G 11 0 11 11 iio:core: utilize new cdev_device_add helper function
git bisect good cb7e71b95d29c72d1f8a2a2a0a34328bde10c3d8 # 11:56 G 11 0 11 22 mtd: utilize new cdev_device_add helper function
git bisect good c65bbfc122b7229dacfb0e9cb208857a48eab87b # 12:02 G 11 0 11 22 rapidio: utilize new cdev_device_add helper function
# first bad commit: [4cd8adb100107dc44e63615040ca2bde43de6167] rtc: utilize new cdev_device_add helper function
git bisect good c65bbfc122b7229dacfb0e9cb208857a48eab87b # 12:05 G 33 0 33 55 rapidio: utilize new cdev_device_add helper function
# extra tests with CONFIG_DEBUG_INFO_REDUCED
git bisect bad 4cd8adb100107dc44e63615040ca2bde43de6167 # 12:16 B 0 7 18 0 rtc: utilize new cdev_device_add helper function
# extra tests on HEAD of linux-devel/devel-catchup-201703170914
git bisect bad 472b8db0e353bce9af369f566db55ab626922906 # 12:16 B 0 33 47 0 0day head guard for 'devel-catchup-201703170914'
# extra tests on tree/branch char-misc/char-misc-testing
git bisect bad 64d77f61c0c2fa6b1aa4820261943fc136a1b31e # 12:26 B 0 7 29 11 auxdisplay: Add HD44780 Character LCD support
# extra tests with first bad commit reverted
git bisect good 44b1351793f770c1c1f10b827a70605b996a4f73 # 12:57 G 11 0 11 11 Revert "rtc: utilize new cdev_device_add helper function"
---
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