From: Kazuhiro NISHIYAMA <redmine@...>
Date: 2010-01-27T08:44:48+09:00
Subject: [ruby-dev:40169] [Bug #2664] Failure: test_segv_test(TestRubyOptions)

Bug #2664: Failure: test_segv_test(TestRubyOptions)
http://redmine.ruby-lang.org/issues/show/2664

起票者: Kazuhiro NISHIYAMA
ステータス: Open, 優先度: Normal
カテゴリ: core
ruby -v: ruby 1.9.2dev (2010-01-27 trunk 26434) [x86_64-linux]

環境によって「-- Ruby level backtrace information-----------------------------------------」が出たり出なかったりして、出る環境では test/ruby/test_rubyoptions.rb の test_segv_test が Failure になります。

% ruby-trunk -e 'Process.kill :SEGV, $$' 2>&1 | head
-e:1: [BUG] Segmentation fault
ruby 1.9.2dev (2010-01-27 trunk 26434) [x86_64-linux]

-- control frame ----------
c:0004 p:---- s:0011 b:0011 l:000010 d:000010 CFUNC  :kill
c:0003 p:0019 s:0006 b:0006 l:002058 d:001bc8 EVAL   -e:1
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:002058 d:002058 TOP
---------------------------
-- Ruby level backtrace information-----------------------------------------


出たり出なかったりする原因は rb_vm_bugreport の i が初期化されていないからのように見えます。

テストも含めて以下のような修正でどうでしょうか?

Index: vm_dump.c
===================================================================
--- vm_dump.c	(revision 26436)
+++ vm_dump.c	(working copy)
@@ -571,8 +571,8 @@
 bugreport_backtrace(void *arg, VALUE file, int line, VALUE method)
 {
     if (!*(int *)arg) {
-	fprintf(stderr, "-- Ruby level backtrace information"
-		"-----------------------------------------\n");
+	fprintf(stderr, "-- Ruby level backtrace information "
+		"----------------------------------------\n");
 	*(int *)arg = 1;
     }
     fprintf(stderr, "%s:%d:in `%s'\n", RSTRING_PTR(file), line, RSTRING_PTR(method));
@@ -586,7 +586,7 @@
 rb_vm_bugreport(void)
 {
     if (GET_THREAD()->vm) {
-	int i;
+	int i = 0;
 	SDR();
 
 	if (rb_backtrace_each(bugreport_backtrace, &i)) {
Index: test/ruby/test_rubyoptions.rb
===================================================================
--- test/ruby/test_rubyoptions.rb	(revision 26436)
+++ test/ruby/test_rubyoptions.rb	(working copy)
@@ -333,6 +333,7 @@
       --\scontrol\sframe\s----------\n
       (?:c:.*\n)*
       ---------------------------\n
+      --\sRuby\slevel\sbacktrace\sinformation\s----------------------------------------\n
       -e:1:in\s`<main>'\n
       -e:1:in\s`kill'\n\n
       (?:


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