On Thu, Jul 03, 2014 at 11:36:38AM +0800, Chen LinX wrote: > From: "Chen LinX" <linx.z.c...@intel.com> > > when do cpu hotplug test and run below perf test together, pmu may access > freed perf_event > > while true; > do > perf record -a -g -f sleep 10 > rm perf.* > done > > the scenario is that when cpu offline firstly, the 'perf_cpu_notify' will > disable event on the > pmu and remove it from the context list. after cpu online, the perf app may > enable the event > that without linked in context list again. when cpu offine the second time, > the 'perf_cpu_notify' > can't disable event on the pmu as the event doesn't link to context list. the > perf app may free > this event later(the free procedure try to disable event on the pmu but as > the cpu is offline, > the 'cpu_function_call(event->cpu, __perf_remove_from_context, event)' is > failed). then after > cpu online again, pmu will access freed perf_event and hit panic.
What? (also, teach your MUA to wrap text at 78 chars)
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