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