Re: perf/tracepoint: another fuzzer generated lockup

[Peter Zijlstra]

On Sat, Nov 09, 2013 at 03:52:59PM +0100, Frederic Weisbecker wrote:
> So, an idea of what may be happening: an event overflows while FASYNC flag is set so it triggers an irq work
> to send the signal (kill_fasync).
> After the irq work triggers, it generates an irq_work_exit event, which in turn overflows and,
> if it has FASYNC, triggers a new irq work. The irq work triggers and generates an irq work exit event which
> has FASYNC flag, etc...
> 
> Looks like a nice way to deadlock with an infinite loop of irq work.


Yep, exactly, see the email I just send.
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