From: Yasuhiro Fukuma <yasuf@...>
Date: 1999-05-28T00:57:11+09:00
Subject: [ruby-dev:7009] [BUG?] Segmentation fault

福間@福岡 です。

以下のようにすると落ちます(1.3のほうはきのうcvsupしてきたもの):

  $ cat bug1.rb
  Thread.new { sleep }
  $ ruby-1.3 -v -rbug1 -e 0
  ruby 1.3.3 (1999-05-25) [i386-freebsd4.0]
  /tmp/rbQv3868:1: warning: useless use of a literal in void context
  /tmp/rbQv3868:1: [BUG] Segmentation fault
  $ ruby -v -rbug1 -e 0
  ruby 1.2.5(99/04/13) [i386-freebsd4.0]
  /tmp/rbbl3869:1: [BUG] Segmentation fault

ちなみに

  $ ruby-1.3 bug1.rb
  $ ruby-1.3 -e 'load "bug1.rb"'
  $ ruby-1.3 -e 'require "bug1"'

とかは大丈夫のようです。

使い方のよくわからないgdbでいろいろいじくってみて

| (gdb) bt
| #0  rb_thread_restore_context (th=0x80c8400, exit=1) at eval.c:6115
| #1  0x805cd9c in stack_extend (th=0x80c8400, exit=1) at eval.c:6056
| #2  0x805ce00 in rb_thread_restore_context (th=0x80c8400, exit=1)
|     at eval.c:6091
| #3  0x805d71b in rb_thread_schedule () at eval.c:6391
| #4  0x805e7b1 in rb_thread_wait_other_threads () at eval.c:6996
| #5  0x8051311 in ruby_run () at eval.c:1014
| #6  0x804fccd in main (argc=4, argv=0xbfbfd780, envp=0xbfbfd794) at main.c:39
| #7  0x804fc41 in _start ()
| (gdb) s
| 6117        rb_lastline_set(tmp->last_line);
| (gdb) bt
| #0  rb_thread_restore_context (th=0x80c8400, exit=1) at eval.c:6117
| #1  0x805cd9c in stack_extend (th=0x80b8984, exit=-1077947036) at eval.c:6056
| #2  0x8059ca9 in rb_load (fname=98, wrap=0) at eval.c:4571
| #3  0x722e3167 in ?? ()
| Error accessing memory address 0x75622f2e: Bad address.
| (gdb) p tmp
| $1 = 0x80c8400
| (gdb) p *tmp
| $2 = {next = 0x80c8100, prev = 0x80c8100, context = {{_jb = {134600437, 
|         134973828, -1077949780, -1077949560, 135037952, -1077949688, 0, 4735, 
|         0}}}, result = 0, stk_len = 787, stk_max = 787, stk_ptr = 0x811a000, 
|   stk_pos = 0xbfbfca8c, frame = 0xbfbfcc5c, scope = 0x80ed928, 
|   dyna_vars = 0x80ed84c, block = 0x0, iter = 0xbfbfcc08, tag = 0xbfbfcf08, 
|   klass = 135240984, wrapper = 0, trace = 0, misc = 1, 
|   file = 0x8117d30 "./bug1.rb", line = 1, errinfo = 4, last_status = 4, 
|   last_line = 4, last_match = 4, safe = 0, status = THREAD_TO_KILL, 
|   wait_for = 0, fd = 0, delay = 1e+30, join = 0x0, abort = 0, locals = 0x0, 
|   thread = 135190624}
| (gdb) l 
| 6112        tmp = th;
| 6113        ex = exit;
| 6114        FLUSH_REGISTER_WINDOWS;
| 6115        MEMCPY(tmp->stk_pos, tmp->stk_ptr, VALUE, tmp->stk_len);
| 6116
| 6117        rb_lastline_set(tmp->last_line);
| 6118        rb_backref_set(tmp->last_match);
| 6119
| 6120        switch (ex) {
| 6121          case RESTORE_FATAL:

あたりが怪しい?  というところまでで息切れしています…。

---
 Yasuhiro Fukuma (福間 康弘) as Yasu.F @ Kitakyushu.Fukuoka.Japan
 Web site: http://www8.big.or.jp/~yasuf/
 “InterNIC is NOT NSI!”