Hi, Peter, Andi While reviewing the deadlock, I find out it looks like we could have the following infinite recursion too:
perf_event_account_interrupt() __perf_event_account_interrupt() perf_adjust_period() event->pmu->stop x86_pmu_stop() x86_pmu.disable() intel_pmu_disable_event() intel_pmu_pebs_disable() intel_pmu_drain_pebs_buffer() intel_pmu_drain_pebs_nhm() <repeat....> This time is pure hardware events, attr.freq must be non-zero. And, we could enter this infinite recursion in NMI handler too: intel_pmu_handle_irq() perf_event_overflow() __perf_event_overflow() __perf_event_account_interrupt() .... Or this is impossible too? Thanks!
