On (12/05/18 14:29), Sergey Senozhatsky wrote: > On (12/05/18 11:57), Sergey Senozhatsky wrote: > > On (12/05/18 10:47), Feng Tang wrote: > > OK... So, apparently, what's happening is panic() calls smp_send_stop(). > And smp_send_stop()->native_stop_other_cpus() on x86 disables local APIC. > So no fun anymore. > > If I keep APIC enabled on panic CPU, then I have my keyboard working, > including PageUp-PageDown scrolling, sysrq handling, and so on. Meeh, it's much harder than this. Worked on one machine only. > PeterZ, > for those folks who sometimes have to use framebuffer for debugging > (just a trivial "let me scrollback and see the panic backtrace") and > not always have access to serial console, can we have local APIC > enabled on the panic_cpu? Or is it a terrible thing to ask for? The question remains: can we have input irqs on panic_cpu after panic? -ss
