diff -r 2251ba078bec -r eb7ce841ccec src/share/vm/utilities/globalDefinitions.hpp
--- a/src/share/vm/utilities/globalDefinitions.hpp	Sat Oct 24 16:18:50 2020 +0800
+++ b/src/share/vm/utilities/globalDefinitions.hpp	Sat Oct 24 16:43:47 2020 +0800
@@ -1067,6 +1067,7 @@
 const intptr_t badAddressVal    = -2;                       // generic "bad address" value
 const intptr_t badOopVal        = -1;                       // generic "bad oop" value
 const intptr_t badHeapOopVal    = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
+const int      badStackSegVal   = 0xCA;                     // value used to zap stack segments
 const int      badHandleValue   = 0xBC;                     // value used to zap vm handle area
 const int      badResourceValue = 0xAB;                     // value used to zap resource area
 const int      freeBlockPad     = 0xBA;                     // value used to pad freed blocks.