Forum: Ruby-dev [ruby-trunk - Bug #10384] [Closed] Fiddle::DLError: unknown symbol "Init_objspace" during Fiddle::Te

Announcement (2017-05-07): www.ruby-forum.com is now read-only since I unfortunately do not have the time to support and maintain the forum any more. Please see rubyonrails.org/community and ruby-lang.org/en/community for other Rails- und Ruby-related community platforms.
F1d6cc2b735bfd82c8773172da2aeab9?d=identicon&s=25 Nobuyoshi Nakada (nobu)
on 2015-01-05 16:17
(Received via mailing list)
Issue #10384 has been updated by Nobuyoshi Nakada.

Status changed from Open to Closed
% Done changed from 0 to 100

Applied in changeset r49157.

----------
test_handle.rb: use -test-/dln/empty

* test/fiddle/test_handle.rb (test_NEXT): use -test-/dln/empty
  which is always a shared object and is not used by others.
  [ruby-dev:48629] [Bug #10384]

----------------------------------------
Bug #10384: Fiddle::DLError: unknown symbol "Init_objspace" during
Fiddle::TestHandle#test_NEXT and Fiddle::TestHandle#test_static_sym on
Solaris
https://bugs.ruby-lang.org/issues/10384#change-50802

* Author: Naohisa Goto
* Status: Closed
* Priority: Normal
* Assignee:
* Category:
* Target version:
* ruby -v: ruby 2.2.0dev (2014-10-14) [sparc64-solaris2.10]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN
----------------------------------------
Solarisにて、make test-all中に以下のエラーが発生することが多くなっています。
(出ないこともたまにあります。)

~~~
  2) Error:
DL::TestHandle#test_static_sym:
DL::DLError: unknown symbol "Init_objspace"
    /XXXXX/test/dl/test_handle.rb:34:in `sym'
    /XXXXX/test/dl/test_handle.rb:34:in `rescue in test_static_sym'
    /XXXXX/test/dl/test_handle.rb:27:in `test_static_sym'

  4) Error:
Fiddle::TestHandle#test_NEXT:
Fiddle::DLError: unknown symbol "Init_objspace"
    /XXXXX/test/fiddle/test_handle.rb:171:in `[]'
    /XXXXX/test/fiddle/test_handle.rb:171:in `rescue in test_NEXT'
    /XXXXX/test/fiddle/test_handle.rb:144:in `test_NEXT'

  5) Error:
Fiddle::TestHandle#test_static_sym:
Fiddle::DLError: unknown symbol "Init_objspace"
    /XXXXX/test/fiddle/test_handle.rb:41:in `sym'
    /XXXXX/test/fiddle/test_handle.rb:41:in `rescue in test_static_sym'
    /XXXXX/test/fiddle/test_handle.rb:34:in `test_static_sym'
~~~

Fiddle::Handle.sym および Fiddle::Handle.[] (DL::Handle.sym なども同様)は内部で
RTLD_NEXT を使用しています。
Solarisのman dlsym(3C) より引用します。

http://docs.oracle.com/cd/E23823_01/html/816-5168/...

~~~
     RTLD_NEXT       Instructs dlsym() to search  for  the  named
                     symbol  in the objects that were loaded fol-
                     lowing the object  from  which  the  dlsym()
                     call is being made.
~~~

Solarisのdlsymでは、handleに RTLD_NEXT
を指定した場合は、そのコードが読み込まれた後に読み込んだシンボルしか検索しません。
このため、require "objspace" による objspace.so の読み込みが require "fiddle"
より前に発生していた場合はエラーになります。

(requireの順番によりエラーが出る・出ないの再現コード)

~~~
 % ruby -e 'require "objspace"; require "fiddle"; p
Fiddle::Handle.sym("Init_objspace")'
-e:1:in `sym': unknown symbol "Init_objspace" (Fiddle::DLError)
        from -e:1:in `<main>'
 % ruby -e 'require "fiddle"; require "objspace"; p
Fiddle::Handle.sym("Init_objspace")'
9223372034655938496
~~~

単純にgrepすると、require "objspace" は以下で行われています。

 test/dl/test_handle.rb:        require 'objspace'
 test/fiddle/test_closure.rb:      require 'objspace'
 test/fiddle/test_handle.rb:        require 'objspace'
 test/lib/profile_test_all.rb:require 'objspace'
 test/objspace/test_objspace.rb:require "objspace"
 test/ruby/test_file_exhaustive.rb:    require "objspace"

これらのテストの実行順番に依存して(ファイルシステムのディレクトリエントリの順番の偶然などのタイミングによって?)、エラーが出たり出なかったりするようです。
This topic is locked and can not be replied to.