KDB_HMAGIC
log_ctx->ulog->kdb_hmagic = KDB_HMAGIC;
log_ctx->ulog->kdb_hmagic = KDB_HMAGIC;
if (ulog->kdb_hmagic != KDB_HMAGIC) {
ulog->kdb_hmagic = KDB_HMAGIC;
if (ulog->kdb_hmagic != KDB_HMAGIC) {
ulog->kdb_hmagic = KDB_HMAGIC;
ulog->kdb_hmagic = KDB_HMAGIC;