The undefined symbols naturally weren't relocated by kexec's linker, so each compiled `call` instruction branched into the middle of itself. The CPU proceeded to interpret the un-relocated address as instructions, resulting in an undefined opcode fault. Since at this point no IDT is loaded, that turned into a triple-fault and reboot. The bug was only visible when running kexec with --console-vga. Signed-off-by: Jamey Sharp <jamey at thetovacompany.com> --- Although GCC warned about this problem, it would have been easier to diagnose if the ELF linking code in the kexec userspace tools would report an error on attempting to link undefined symbols. purgatory/arch/i386/console-x86.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/purgatory/arch/i386/console-x86.c b/purgatory/arch/i386/console-x86.c index 68f5daf..9773573 100644 --- a/purgatory/arch/i386/console-x86.c +++ b/purgatory/arch/i386/console-x86.c @@ -1,5 +1,5 @@ #include <stdint.h> -#include <sys/io.h> +#include <arch/io.h> #include <purgatory.h> /* -- 1.5.4.1
