(kgdb) thread 257 [Switching to thread 257 (Thread 100247)]#0 sched_switch (td=0xfffff80079fd3000, newtd=, flags=) at /usr/src/sys/kern/sched_ule.c:1956 1956 cpuid = PCPU_GET(cpuid); Current language: auto; currently minimal (kgdb) frame 15 #15 0xffffffff80980b02 in sysctl_root (arg1=, arg2=) at /usr/src/sys/kern/kern_sysctl.c:1532 1532 error = oid->oid_handler(oid, arg1, arg2, req); (kgdb) l 1527 if ((oid->oid_kind & CTLFLAG_VNET) && arg1 != NULL) 1528 arg1 = (void *)(curvnet->vnet_data_base + (uintptr_t)arg1); 1529 #endif 1530 if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1531 mtx_lock(&Giant); 1532 error = oid->oid_handler(oid, arg1, arg2, req); 1533 if (!(oid->oid_kind & CTLFLAG_MPSAFE)) 1534 mtx_unlock(&Giant); 1535 1536 KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error); (kgdb) p *oid $1 = {oid_parent = 0xfffff8000a0d7b20, oid_link = {sle_next = 0xfffff8000a0db880}, oid_number = 2147480894, oid_kind = 2181038083, oid_arg1 = 0xfffff8000870cc00, oid_arg2 = 3, oid_name = 0xfffff8000a0d7ad0 "%pnpinfo", oid_handler = 0xffffffff809aafc0 , oid_fmt = 0xffffffff8100916e "A", oid_refcnt = 1, oid_running = 1, oid_descr = 0xfffff8000a0d67c0 "device identification"} (kgdb) p arg1 $2 = (kgdb) p arg2 $3 = (kgdb) p req Cannot access memory at address 0x0 (kgdb) p !(oid->oid_kind & 0x00040000) $6 = 1