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