Comment 2 for bug 593434

Same problem here, but on slightly different setup, Ubuntu 10.04.1 LTS + 2.6.35-13-generic x86_64 from xorg-edgers ppa. Problem happened with all Ubuntu 2.6.35.x kernel versions. Don't happen with 2.6.32 or 2.6.34.

[ 77.510014] ------------[ cut here ]------------
[ 77.510023] WARNING: at /build/buildd/linux-2.6.35/arch/x86/include/asm/processor.h:1005 read_measured_perf_ctrs+0x78/0x90()
[ 77.510027] Hardware name: SG33
[ 77.510029] Modules linked in: hidp rfcomm ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack binfmt_misc ipt_REJECT xt_tcpudp iptable_filter kvm_intel ip_tables sco x_tables ppdev bnep kvm bridge stp l2cap snd_hda_codec_atihdmi snd_hda_codec_intelhdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi snd_pcm snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd lp soundcore btusb snd_page_alloc bluetooth parport serio_raw usbhid hid radeon ttm drm_kms_helper drm ahci usb_storage libahci i2c_algo_bit pata_jmicron sky2 intel_agp
[ 77.510085] Pid: 67, comm: kondemand/0 Not tainted 2.6.35-13-generic #18-Ubuntu
[ 77.510088] Call Trace:
[ 77.510095] [<ffffffff8105f6bf>] warn_slowpath_common+0x7f/0xc0
[ 77.510100] [<ffffffff8105f71a>] warn_slowpath_null+0x1a/0x20
[ 77.510104] [<ffffffff81026078>] read_measured_perf_ctrs+0x78/0x90
[ 77.510109] [<ffffffff81026000>] ? read_measured_perf_ctrs+0x0/0x90
[ 77.510113] [<ffffffff810943dc>] smp_call_function_single+0x8c/0x160
[ 77.510118] [<ffffffff81025f8c>] cpufreq_get_measured_perf+0x2c/0xa0
[ 77.510124] [<ffffffff8146c348>] __cpufreq_driver_getavg+0x78/0x80
[ 77.510128] [<ffffffff8146f63f>] dbs_check_cpu+0x7f/0x2c0
[ 77.510132] [<ffffffff8146f958>] do_dbs_timer+0xd8/0x100
[ 77.510136] [<ffffffff8146f880>] ? do_dbs_timer+0x0/0x100
[ 77.510141] [<ffffffff81079605>] run_workqueue+0xc5/0x1a0
[ 77.510145] [<ffffffff81079783>] worker_thread+0xa3/0x110
[ 77.510150] [<ffffffff8107e4d0>] ? autoremove_wake_function+0x0/0x40
[ 77.510154] [<ffffffff810796e0>] ? worker_thread+0x0/0x110
[ 77.510158] [<ffffffff8107df76>] kthread+0x96/0xa0
[ 77.510163] [<ffffffff8100aee4>] kernel_thread_helper+0x4/0x10
[ 77.510167] [<ffffffff8107dee0>] ? kthread+0x0/0xa0
[ 77.510170] [<ffffffff8100aee0>] ? kernel_thread_helper+0x0/0x10
[ 77.510174] ---[ end trace 8f828320a6cc5309 ]---