d0165cba28
cpu_switch_load_gs, cpu is in context switch, so don't enable interrupt. because it is in context switch, it is expected sched_lock was held, so don't PROC_LOCK(p) and psignal, it is LOR, probably we can set a P_XSIGBUS like flag in p_sflags, and set TDF_ASTPENDING in td_flags, in ast(), post a SIGBUS to process if P_XSIGBUS was set.