Re: Early hang with 2.6.21-rc4-rt1

[Ingo Molnar]

* Roland Dreier <rdreier@xxxxxxxxx> wrote:

> Great, thanks ... I'm not sure which of the 2 patches fixed things, 
> but I now got the following trace.  I've not really analyzed this, but 
> it definitely looks like tun_init() is doing something fishy... 
> ("149776 us maximum-latency"!!)

best would be to enable FUNCTION_TRACING and to do:

	echo 1 > /proc/sys/kernel/trace_enabled
	echo 1 > /proc/sys/kernel/mcount_enabled

this will give you an exact trace of what happened, in 
/proc/latency_trace.

	Ingo
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