I am looking at perf_sigtrap and I am confused by the code. /* * We'd expect this to only occur if the irq_work is delayed and either * ctx->task or current has changed in the meantime. This can be the * case on architectures that do not implement arch_irq_work_raise(). */ if (WARN_ON_ONCE(event->ctx->task != current)) return; /* * perf_pending_event() can race with the task exiting. */ if (current->flags & PF_EXITING) return; It performs tests that absolutely can never fail if we are talking about a synchronous exception. The code force_sig family of functions only make sense to use with and are only safe to use with synchronous exceptions. Are the tests in perf_sigtrap necessary or is perf_sigtrap not reporting a synchronous event? Eric
