From: Ingo Molnar on 32-bit, system gates are traps. on 64-bit, they are interrupts (which disable hardirqs). Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton --- include/asm-x86/desc.h | 4 ++++ 1 file changed, 4 insertions(+) diff -puN include/asm-x86/desc.h~x86-fix-system-gate-related-crash include/asm-x86/desc.h --- a/include/asm-x86/desc.h~x86-fix-system-gate-related-crash +++ a/include/asm-x86/desc.h @@ -328,7 +328,11 @@ static inline void set_trap_gate(unsigne static inline void set_system_gate(unsigned int n, void *addr) { BUG_ON((unsigned)n > 0xFF); +#ifdef CONFIG_X86_32 + _set_gate(n, GATE_TRAP, addr, 0x3, 0, __KERNEL_CS); +#else _set_gate(n, GATE_INTERRUPT, addr, 0x3, 0, __KERNEL_CS); +#endif } static inline void set_task_gate(unsigned int n, unsigned int gdt_entry) _