Re: x86_64 2.6.35.* kernels and Intel Xeon X5550

[Len Brown <lenb@kernel.org>]

> > 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/*/*'

thanks,
-Len Brown, Intel Open Source Technology Center