Re: [tracing, hang] dumping events gets stuck in synchronise_sched

[Lai Jiangshan]

On 08/17/2010 03:37 PM, Dave Chinner wrote:
> Tracing folks,
> 
> I've got a machine stuck with a cpu spinning in a tight loop (the
> new writeback/sync livelock avoidance code is, well, livelocking),
> and I was trying to find out what triggered by using the writeback
> trace events. Unfortunately, I can't dump the trace events because
> it gets stuck here:

> 
> Given that the trace events are there mainly for debugging, this
> seems like a bit of an oversight - hanging a CPU in a tight loop is
> not an uncommon event during code development....
> 

You can try 'cat trace_pipe', if I did not miss you meaning.

Lai

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