Re: x86_64 2.6.35.* kernels and Intel Xeon X5550

[Marc Aurele La France]

On Sat, 16 Oct 2010, Len Brown wrote:

> > > 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.

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

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

> Please reproduce using an upstream 2.6.36-rc8 kernel.

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

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

> 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/*/*'

I've gathered all the data, but the kernel's BZ is borked at the moment, 
so this'll have to wait.

Marc.

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