naruse	2017-12-01 23:32:12 +0900 (Fri, 01 Dec 2017)

  New Revision: 60969

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60969

  Log:
    re-apply r60755

  Modified files:
    trunk/regexec.c
Index: regexec.c
===================================================================
--- regexec.c	(revision 60968)
+++ regexec.c	(revision 60969)
@@ -2501,6 +2501,7 @@ match_at(regex_t* reg, const UChar* str, https://github.com/ruby/ruby/blob/trunk/regexec.c#L2501
     CASE(OP_MEMORY_START)  MOP_IN(OP_MEMORY_START);
       GET_MEMNUM_INC(mem, p);
       mem_start_stk[mem] = (OnigStackIndex )((void* )s);
+      mem_end_stk[mem] = INVALID_STACK_INDEX;
       MOP_OUT;
       JUMP;
 

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