linux-kernel - BUG: using smp_processor_id() in preemptible [00000000] code: ondemand/1327

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Date:	Sun, 30 May 2010 18:02:36 +1000
From:	andrew hendry <andrew.hendry@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: BUG: using smp_processor_id() in preemptible [00000000] code: 
	ondemand/1327

I get 6 of these logged together about 1 minute after startup on an i7-860.
Config attached. Distro is Ubuntu 10.04 64 bit.
Is this one known or should I start a bisect?

[   64.924201] BUG: using smp_processor_id() in preemptible [00000000]
code: ondemand/1327
[   64.924625] caller is nr_iowait_cpu+0x1a/0x40
[   64.924627] Pid: 1327, comm: ondemand Not tainted 2.6.34 #2
[   64.924629] Call Trace:
[   64.924634]  [<ffffffff81288548>] debug_smp_processor_id+0xd8/0xf0
[   64.924637]  [<ffffffff81042c7a>] nr_iowait_cpu+0x1a/0x40
[   64.924641]  [<ffffffff81089f42>] update_ts_time_stats+0x72/0x90
[   64.924645]  [<ffffffff81012759>] ? read_tsc+0x9/0x20
[   64.924647]  [<ffffffff81084733>] ? ktime_get+0x63/0xe0
[   64.924650]  [<ffffffff8108a162>] get_cpu_idle_time_us+0x52/0x80
[   64.924654]  [<ffffffff8140a44c>] cpufreq_governor_dbs+0x1dc/0x430
[   64.924657]  [<ffffffff81407af5>] __cpufreq_governor+0xc5/0x190
[   64.924660]  [<ffffffff81407552>] ? lock_policy_rwsem_write+0x52/0x90
[   64.924662]  [<ffffffff81407d07>] __cpufreq_set_policy+0x147/0x190
[   64.924665]  [<ffffffff81408125>] store_scaling_governor+0xe5/0x210
[   64.924667]  [<ffffffff81408480>] ? handle_update+0x0/0x20
[   64.924672]  [<ffffffff8151dc00>] ? _raw_write_unlock_irq+0x40/0x50
[   64.924675]  [<ffffffff814075f7>] store+0x67/0xa0
[   64.924679]  [<ffffffff811a1375>] sysfs_write_file+0xe5/0x170
[   64.924682]  [<ffffffff8113b088>] vfs_write+0xb8/0x180
[   64.924685]  [<ffffffff8113b231>] sys_write+0x51/0x90
[   64.924689]  [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b

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