RE: 2.6.23.8, ondemand scaling governor: "BUG: soft lockup detected on CPU#0!"

["Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>]

>-----Original Message-----
>From: Harald Dunkel [mailto:harald.dunkel@t-online.de] 
>Sent: Tuesday, November 20, 2007 12:17 AM
>To: Pallipadi, Venkatesh
>Cc: Linux Kernel list
>Subject: Re: 2.6.23.8, ondemand scaling governor: "BUG: soft 
>lockup detected on CPU#0!"
>
>Pallipadi, Venkatesh wrote:
>> 
>> Can you try switching to powersave governor (which should 
>always run CPU
>> at 400MHz) and see whether you see similar error?
>> 
>
>Yes, if I move from performance to powersave, then I see a similar
>error:
>
>Nov 20 09:06:48 bugs kernel: BUG: soft lockup detected on CPU#0!
>Nov 20 09:06:48 bugs kernel:  [<c013cf8d>] softlockup_tick+0x91/0xa6
>Nov 20 09:06:48 bugs kernel:  [<c012269c>] 
>update_process_times+0x3a/0x5d
>Nov 20 09:06:48 bugs kernel:  [<c0131219>] tick_sched_timer+0x115/0x164
>Nov 20 09:06:48 bugs kernel:  [<c012d311>] 
>hrtimer_interrupt+0x102/0x191
>Nov 20 09:06:48 bugs kernel:  [<c0106cd6>] timer_interrupt+0x2e/0x34
>Nov 20 09:06:48 bugs kernel:  [<c013d1f6>] handle_IRQ_event+0x1a/0x3f
>Nov 20 09:06:48 bugs kernel:  [<c013e4e1>] handle_level_irq+0xa8/0xb7
>Nov 20 09:06:48 bugs kernel:  [<c0106367>] do_IRQ+0x53/0x6c
>Nov 20 09:06:48 bugs kernel:  [<c0104853>] common_interrupt+0x23/0x28
>Nov 20 09:06:48 bugs kernel:  =======================
>
>

This looks like TSC related issue. Ingo's patch commit id
a3b13c23f186ecb57204580cc1f2dbe9c284953a
http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.g
it;a=commit;h=a3b13c23f186ecb57204580cc1f2dbe9c284953a 
should help.

Thanks,
Venki
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