linux-kernel - Re: [BUG] 2.6.29.1 debugobjects warning

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Date:	Thu, 23 Apr 2009 16:46:38 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	cpufreq@...r.kernel.org
Subject: Re: [BUG] 2.6.29.1 debugobjects warning

On Thu, 23 Apr 2009 10:00:02 -0400
Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> Hi,
> 
> I got the following warning on my Thinkpad T43p laptop (single-core
> 32-bits x86). I run the 2.6.29.1 tree, plus LTTng patchset applied. It
> seems to come from cpufreq. Any idea what is going on here ?
> 
> 
> ------------[ cut here ]------------
> WARNING: at lib/debugobjects.c:217 debug_print_object+0x5a/0x70()
> Hardware name: 2687D5U
> ODEBUG: init active object type: timer_list
> Modules linked in: irda parport nsc_ircc irtty_sir parport_pc psmouse snd_seq sn
> d_seq_midi_event hid_logitech ac unix floppy output battery sir_dev nvram snd_ra
> wmidi pcmcia x_tables ip_tables joydev snd_seq_midi evdev video snd_page_alloc s
> oundcore led_class i2c_i801 cryptoloop snd snd_seq_dummy rfkill thinkpad_acpi sn
> d_seq_oss snd_mixer_oss loop ipw2200 blowfish aes_i586 snd_pcm_oss ac97_bus snd_
> seq_device agpgart snd_pcm ide_cd_mod snd_timer intel_agp snd_ac97_codec ide_gen
> eric button snd_intel8x0 edd acpi_cpufreq ltt_statedump ipc_trace usbhid thermal
>  mm_trace snd_intel8x0m fs_trace pcmcia_core rcu_trace lib80211 syscall_trace rs
> rc_nonstatic libphy serio_raw kernel_trace tg3 trap_trace libipw crc_ccitt net_t
> race dm_mod dm_log dm_region_hash dm_mirror yenta_socket dm_snapshot fat vfat nl
> s_cp437 nls_iso8859_1 lp ppdev af_packet drm ntfs ipv6 auth_rpcgss binfmt_misc r
> adeon lockd sunrpc nfs
> Pid: 3628, comm: cpufreqd Not tainted 2.6.29.1-trace #28
> Call Trace:
>  [<c1044123>] warn_slowpath+0x73/0xd0
>  [<c1069c28>] ? mark_held_locks+0x48/0x90
>  [<c13313f5>] ? __mutex_unlock_slowpath+0xd5/0x150
>  [<c1069f39>] ? trace_hardirqs_on_caller+0x199/0x1f0
>  [<c1331478>] ? mutex_unlock+0x8/0x10
>  [<c1331478>] ? mutex_unlock+0x8/0x10
>  [<c1107b76>] ? sysfs_addrm_finish+0x16/0x230
>  [<c1107671>] ? sysfs_find_dirent+0x21/0x30
>  [<c116d71a>] debug_print_object+0x5a/0x70
>  [<c116e054>] __debug_object_init+0x254/0x340
>  [<c126533f>] ? cpufreq_governor_dbs+0x10f/0x210
>  [<c116e187>] debug_object_init+0x17/0x20
>  [<c104de70>] init_timer+0x10/0x30
>  [<c104de9b>] init_timer_deferrable+0xb/0x20
>  [<c12653fd>] cpufreq_governor_dbs+0x1cd/0x210
>  [<c126205b>] __cpufreq_governor+0xab/0x120
>  [<c12621cb>] __cpufreq_set_policy+0xfb/0x140
>  [<c1262c24>] store_scaling_governor+0xa4/0x220
>  [<c1263550>] ? handle_update+0x0/0x10
>  [<c1262b80>] ? store_scaling_governor+0x0/0x220
>  [<c126343e>] store+0x4e/0x70
>  [<c1106b9c>] sysfs_write_file+0x9c/0x100
>  [<c10b825c>] vfs_write+0x9c/0x140
>  [<c1106b00>] ? sysfs_write_file+0x0/0x100
>  [<c10b8447>] sys_write+0x47/0xe0
>  [<c1021dde>] syscall_call+0x7/0xb
>  [<c1020000>] ? sys_vfork+0x20/0x30
> 

It seems to be complaining that cpufreq_governor_dbs() is running
init_timer() against a timer which has already been initialised once.

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