naruse	2017-05-17 16:13:47 +0900 (Wed, 17 May 2017)

  New Revision: 58769

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58769

  Log:
    Treat NULL reference case [Bug #13566]

  Modified files:
    trunk/vm_dump.c
Index: vm_dump.c
===================================================================
--- vm_dump.c	(revision 58768)
+++ vm_dump.c	(revision 58769)
@@ -475,8 +475,8 @@ darwin_sigtramp: https://github.com/ruby/ruby/blob/trunk/vm_dump.c#L475
 	unw_set_reg(&cursor, UNW_X86_64_R14, uctx->uc_mcontext->__ss.__r14);
 	unw_set_reg(&cursor, UNW_X86_64_R15, uctx->uc_mcontext->__ss.__r15);
 	ip = uctx->uc_mcontext->__ss.__rip;
-	if (((char*)ip)[-2] == 0x0f && ((char*)ip)[-1] == 5) {
-	    /* signal received in syscall */
+	if (!ip || (((char*)ip)[-2] == 0x0f && ((char*)ip)[-1] == 5)) {
+	    /* NULL reference or signal received in syscall */
 	    trace[n++] = (void *)ip;
 	    ip = *(unw_word_t*)uctx->uc_mcontext->__ss.__rsp;
 	}

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