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| author | Ethan Zhao <ethan.zhao@oracle.com> | 2015-03-12 13:04:16 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-25 15:26:49 +0100 |
| commit | d82d54af7b14092dc5934a8ce09170789c9ddb57 (patch) | |
| tree | 2774e75816e8d97331217a31983d3b930d8f0d15 /lib/kobject.c | |
| parent | bea2b592fd18eb8ffa3fc4ad380610632d03a38f (diff) | |
| download | lwn-d82d54af7b14092dc5934a8ce09170789c9ddb57.tar.gz lwn-d82d54af7b14092dc5934a8ce09170789c9ddb57.zip | |
kobject: WARN as tip when call kobject_get() to a kobject not initialized
call kobject_get() to kojbect that is not initalized or released will only
leave following like call trace to us:
-----------[ cut here ]------------
[ 54.545816] WARNING: CPU: 0 PID: 213 at include/linux/kref.h:47
kobject_get+0x41/0x50()
[ 54.642595] Modules linked in: i2c_i801(+) mfd_core shpchp(+)
acpi_cpufreq(+) edac_core ioatdma(+) xfs libcrc32c ast syscopyarea ixgbe
sysfillrect sysimgblt sr_mod sd_mod drm_kms_helper igb mdio cdrom e1000e ahci
dca ttm libahci uas drm i2c_algo_bit ptp megaraid_sas libata usb_storage
i2c_core pps_core dm_mirror dm_region_hash dm_log dm_mod
[ 55.007264] CPU: 0 PID: 213 Comm: kworker/0:2 Not tainted
3.18.5
[ 55.099970] Hardware name: Oracle Corporation SUN FIRE X4170 M2 SERVER
/ASSY,MOTHERBOARD,X4170, BIOS 08120104 05/08/2012
[ 55.239736] Workqueue: kacpi_notify acpi_os_execute_deferred
[ 55.308598] 0000000000000000 00000000bd730b61 ffff88046742baf8
ffffffff816b7edb
[ 55.398305] 0000000000000000 0000000000000000 ffff88046742bb38
ffffffff81078ae1
[ 55.488040] ffff88046742bbd8 ffff8806706b3000 0000000000000292
0000000000000000
[ 55.577776] Call Trace:
[ 55.608228] [<ffffffff816b7edb>] dump_stack+0x46/0x58
[ 55.670895] [<ffffffff81078ae1>] warn_slowpath_common+0x81/0xa0
[ 55.743952] [<ffffffff81078bfa>] warn_slowpath_null+0x1a/0x20
[ 55.814929] [<ffffffff8130d0d1>] kobject_get+0x41/0x50
[ 55.878654] [<ffffffff8153e955>] cpufreq_cpu_get+0x75/0xc0
[ 55.946528] [<ffffffff8153f37e>] cpufreq_update_policy+0x2e/0x1f0
The above issue was casued by a race condition, if there is a WARN in
kobject_get() of the kobject is not initialized, that would save us much
time to debug it.
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/kobject.c')
| -rw-r--r-- | lib/kobject.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/kobject.c b/lib/kobject.c index 03d4ab349fa7..3b841b97fccd 100644 --- a/lib/kobject.c +++ b/lib/kobject.c @@ -576,8 +576,13 @@ void kobject_del(struct kobject *kobj) */ struct kobject *kobject_get(struct kobject *kobj) { - if (kobj) + if (kobj) { + if (!kobj->state_initialized) + WARN(1, KERN_WARNING "kobject: '%s' (%p): is not " + "initialized, yet kobject_get() is being " + "called.\n", kobject_name(kobj), kobj); kref_get(&kobj->kref); + } return kobj; } |