On Tue, Oct 15, 2013 at 02:01:04AM +0000, Liu, Chuansheng wrote: > We meet one issue that during trigger all CPU backtrace, but during in the > NMI handler arch_trigger_all_cpu_backtrace_handler, > It hit the PAGE fault, then PAGE fault is in loop, at last the thread stack > overflow, and system panic. > > Anyone can give some help? Thanks.
Looks like we re-enter the fault several times. On x86-32, NMIs can fault if they dereference vmalloc'ed area. I wonder if the module thing we lookup in the NMI is stored on some vmalloc'ed area. Also, may be we enter the fault, trigger the WARN_ON_ONCE(in_nmi()) warning, which in turn dumps the stack, lookup that module address, refaults, etc... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
