Index: head/sys/powerpc/aim/locore64.S
===================================================================
--- head/sys/powerpc/aim/locore64.S
+++ head/sys/powerpc/aim/locore64.S
@@ -66,7 +66,7 @@
 TOC_ENTRY(can_wakeup)
 
 #ifdef KDB
-#define TRAPSTKSZ       4096            /* 4k trap stack */
+#define TRAPSTKSZ       8192            /* 8k trap stack */
 GLOBAL(trapstk)
         .space        TRAPSTKSZ
 TOC_ENTRY(trapstk)