On Tue, Feb 21, 2017 at 08:37:21PM +0800, Xunlei Pang wrote: > - /* If this CPU is offline, just bail out. */ > - if (cpu_is_offline(smp_processor_id())) { > + /* > + * Cases to bail out to avoid rendezvous process timeout: > + * 1)If crashing_cpu was set, e.g. entering kdump, > + * we need to skip cpus remaining in 1st kernel. > + * 2)If this CPU is offline. > + */ > + if (crashing_cpu != -1 || > + cpu_is_offline(smp_processor_id())) { You're still not letting the crashing_cpu enter the #MC handler. You need to handle the MCE no matter how short the window is. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.