On Sat, 16 Oct 2010, Len Brown wrote:

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>>> On the Xeon's, 2.6.35 hangs early on, upon the first test of trace events
>>> (in kernel/trace/trace_events.c:event_trace_self_tests()).  When disabling
>>> all tracing, debugging, etc., it still hangs but slightly later.  The
>>> megaraid_sas module is loaded, detects the adapter, but never gets around to
>>> registering it with the SCSI layer.

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>> This is due to "CONFIG_INTEL_IDLE=y".

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> Please file a bug report at bugzilla.kernel.org and assign it to me.

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> Please reproduce using an upstream 2.6.36-rc8 kernel.

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> Boot a CONFIG_INTEL_IDLE=n kernel and to the bug report...

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> attach the output from acpidump
> 'cat /proc/cpuinfo'
> 'grep . /sys/devices/system/cpu/cpu*/cpuidle/*/*'
> 'lspci'

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> Then boot a CONFIG_INTEL_IDLE=y kernel and see what is the highest N that
> boots when you boot with "intel_idle.max_cstate=N"  (0 will disable
> the driver completely) and if any of them boot, for the highest N,
> attach to the bug report the complete dmesg and the output from
> 'grep . /sys/devices/system/cpu/cpu*/cpuidle/*/*'

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> thanks,
> -Len Brown, Intel Open Source Technology Center

Done.  However, due to finger-checks BZ won't let me correct, you'll need 
to ignore the initial descriptions of the attachments.  Look at 
"[details]" instead.

Marc.

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