Re: perf/tracepoint: another fuzzer generated lockup

[Peter Zijlstra]

On Sat, Nov 09, 2013 at 04:27:01PM +0100, Frederic Weisbecker wrote:
> In fact, raising an irq work from an irq work should simply be prohibited. That's not a sane
> behaviour.

Well, it is because as you raised on IRC we could be holding locks and
trying to avoid deadlocks. This is the very reason irq_work gets used in
printk.

And its not a recursive run()->work()->queue() either, because as you said this
tracepoint is in arch code _after_ work_run completes.

All in all an exceedingly vexing issue.
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