Bug #10384: Fiddle::DLError: unknown symbol "Init_objspace" during Fiddle::TestHandle#test_NEXT and Fiddle::TestHandle#test_static_sym on Solaris

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 2.2.0dev (2014-10-14) [sparc64-solaris2.10]
• Backport: 2.0.0: REQUIRED, 2.1: DONE, 2.2: DONE

[ngoto (Naohisa Goto)]

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/dlsym-3c.html

     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。

[hsbt (Hiroshi SHIBATA)]

• Related to Bug #9928: Fiddle::TestHandle#test_NEXT fails on AIX due to unexported symbols of extension libraries added

[nobu (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]

[usa (Usaku NAKAMURA)]

• Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN to 2.0.0: REQUIRED, 2.1: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: REQUIRED, 2.1: REQUIRED to 2.0.0: REQUIRED, 2.1: DONE

Backported into ruby_2_1 at r50129.

[ngoto (Naohisa Goto)]

• Related to Backport #11085: Fiddle::TestHandle#test_static_sym and Fiddle::TestHandle#test_NEXT: LoadError: cannot load such file -- -test-/dln/empty added

[ngoto (Naohisa Goto)]

• Backport changed from 2.0.0: REQUIRED, 2.1: DONE to 2.0.0: REQUIRED, 2.1: REQUIRED

[usa (Usaku NAKAMURA)]

• Backport changed from 2.0.0: REQUIRED, 2.1: REQUIRED to 2.0.0: REQUIRED, 2.1: DONE

ruby_2_1 r50383 merged revision(s) 49154,49155,49156,49159.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 2.0.0: REQUIRED, 2.1: DONE to 2.0.0: REQUIRED, 2.1: DONE, 2.2: DONE

Backported into ruby_2_2 branch at r54316.

[nagachika (Tomoyuki Chikanaga)]

r49154 should be backported too. Backported into ruby_2_2 branch at r54342.