> > Neil, is it possible to do some serial console debugging to find out > where exactly we are hanging? Beats me, what's that operation which can > not be executed while being in NMI handler and makes system to hang. I am > also curious to know if it is nested NMI case. > > Thanks > Vivek > Hey- Some intermediate results: I've instrumented head.S in the kernel with the following code: #define SEROUT(z) \ mov $0x3F8,%dx;\ movb z,%al;\ outb %dx And peppered different ascii characters throughout the startup code from startup_32 to right before the jump to start_kernel. When I panic the system via an: echo c > /proc/sysrq_trigger I see an appropriate sequence of characters on the serial console When I panic the box by forcing an NMI watchdog timeout however, I see nothing. The machine will either hang, or reset into the bios. I think this is reasonably conclusive in its indication that we're not getting into the second kernel when this problem occurs. Next I'll instrument the purgatory code in a simmilar way. Regards Neil > _______________________________________________ > kexec mailing list > kexec at lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec -- /**************************************************** * Neil Horman <nhorman at tuxdriver.com> * Software Engineer, Red Hat ****************************************************/
