Bug #932: incorrect case statement in "ext/dl/test/test_base.rb" causes library problems on openSUSE 11.1 64-bit

• Status: Closed
• Assignee: -
• Target version: 1.9.1 Release Candidate

[znmeb (Ed Borasky)]

=begin
I compiled Ruby 1.9.1 from the SVN repository and tried to reproduce the segfault issue #633 on my openSUSE 11.1 x86_64 system. Instead of segfaulting, it did this:

znmeb@DreamScape:~/Packages/ruby/ext/dl/test> ruby test_all.rb
nil
Loaded suite test_all
Started
EEEEEEEEEEEEEEEEEE
Finished in 0.002599 seconds.

1. Error:
   test_empty(DL::TestBase):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

2. Error:
   test_call_double(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

3. Error:
   test_call_int(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

4. Error:
   test_call_long(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

5. Error:
   test_callback(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

6. Error:
   test_cptr(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

7. Error:
   test_dlwrap(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

8. Error:
   test_empty(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

9. Error:
   test_sin(DL::TestDL):
   DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
   /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

10. Error:
    test_strcpy(DL::TestDL):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

11. Error:
    test_strlen(DL::TestDL):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

12. Error:
    test_atof(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

13. Error:
    test_empty(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'

 /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

14. Error:
    test_isdigit(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

15. Error:
    test_qsort1(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

16. Error:
    test_qsort2(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

17. Error:
    test_strcpy(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

18. Error:
    test_strtod(DL::TestFunc):
    DL::DLError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in initialize' /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in dlopen'
    /home/znmeb/Packages/ruby/ext/dl/test/test_base.rb:29:in `setup'

18 tests, 0 assertions, 0 failures, 18 errors, 0 skips
/home/znmeb/test/lib/ruby/1.9.1/dl/import.rb:52:in rescue in block in dlload': can't load /lib/libc.so.6 (DL::DLError) from /home/znmeb/test/lib/ruby/1.9.1/dl/import.rb:49:in block in dlload'
from /home/znmeb/test/lib/ruby/1.9.1/dl/import.rb:40:in collect' from /home/znmeb/test/lib/ruby/1.9.1/dl/import.rb:40:in dlload'
from /home/znmeb/Packages/ruby/ext/dl/test/test_import.rb:7:in <module:LIBC>' from /home/znmeb/Packages/ruby/ext/dl/test/test_import.rb:5:in module:DL'
from /home/znmeb/Packages/ruby/ext/dl/test/test_import.rb:4:in <top (required)>' from test_all.rb:6:in require'
from test_all.rb:6:in `'
znmeb@DreamScape:~/Packages/ruby/ext/dl/test>

After a little poking around with "locate", "ldd" and "grep" I discovered this "case" statement in "test_base.rb":

require 'test/unit'
2 require 'dl'
3
4 case RUBY_PLATFORM
5 when /cygwin/
6 LIBC_SO = "cygwin1.dll"
7 LIBM_SO = "cygwin1.dll"
8 when /linux/
9 LIBC_SO = "/lib/libc.so.6"
10 LIBM_SO = "/lib/libm.so.6"
11 when /mingw/, /mswin32/
12 LIBC_SO = "msvcrt.dll"
13 LIBM_SO = "msvcrt.dll"
14 else
15 LIBC_SO = ARGV[0]
16 LIBM_SO = ARGV[1]
17 if( !(LIBC_SO && LIBM_SO) )
18 $stderr.puts("#{$0} ")
19 exit
20 end
21 end
22

On an openSUSE 11.1 64-bit system, "/lib/libc.so.6" is the 32-bit one, and the 64-bit one is "/lib64/libc.so.6". On my system, "RUBY_PLATFORM" is

znmeb@DreamScape:~/Packages> which ruby
/home/znmeb/test/bin/ruby
znmeb@DreamScape:~/Packages> ruby -e 'puts RUBY_PLATFORM'
x86_64-linux

So I added a branch to the "case":

3
4 case RUBY_PLATFORM
5 when /cygwin/
6 LIBC_SO = "cygwin1.dll"
7 LIBM_SO = "cygwin1.dll"
8 when /x86_64-linux/
9 LIBC_SO = "/lib64/libc.so.6"
10 LIBM_SO = "/lib64/libm.so.6"
11 when /linux/
12 LIBC_SO = "/lib/libc.so.6"
13 LIBM_SO = "/lib/libm.so.6"
14 when /mingw/, /mswin32/
15 LIBC_SO = "msvcrt.dll"
16 LIBM_SO = "msvcrt.dll"
17 else
18 LIBC_SO = ARGV[0]
19 LIBM_SO = ARGV[1]
20 if( !(LIBC_SO && LIBM_SO) )
21 $stderr.puts("#{$0} ")
22 exit
23 end
24 end
25

and the library problem goes away. As far as I know, the "libc.so.6" problem shows up only on openSUSE 11.1, but there should probably be a more portable / robust way of setting that constant. I looked at a few other uses of "RUBY_PLATFORM" in the source tree, and there are quite a few places where it's comparing against "just" /linux/. Some of those may also need to differentiate between 32-bit and 64-bit Linux platforms.
=end

[yugui (Yuki Sonoda)]

• Priority changed from Normal to 5

=begin

=end

[yugui (Yuki Sonoda)]

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

=begin
Applied in changeset r21177.
=end

[kubo (Takehiro Kubo)]

=begin
How about the following patch which is a piece of one I posted to #633.

Index: ext/dl/test/test_base.rb

--- ext/dl/test/test_base.rb (revision 21112)
+++ ext/dl/test/test_base.rb (working copy)
@@ -6,8 +6,17 @@
LIBC_SO = "cygwin1.dll"
LIBM_SO = "cygwin1.dll"
when /linux/

• LIBC_SO = "/lib/libc.so.6"
• LIBM_SO = "/lib/libm.so.6"

• libdir = '/lib'
• case [0].pack('L!').size
• when 4

• 32-bit ruby

• libdir = '/lib32' if File.directory? '/lib32'
• when 8

• 64-bit ruby

• libdir = '/lib64' if File.directory? '/lib64'
• end
• LIBC_SO = File.join(libdir, "libc.so.6")
• LIBM_SO = File.join(libdir, "libm.so.6")
  when /mingw/, /mswin32/
  LIBC_SO = "msvcrt.dll"
  LIBM_SO = "msvcrt.dll"

I got similar problems When I ran i386 ruby on ubuntu x86_64.
32-bit libraries are in /lib32 on the platform.

redhat-based x86_64 linux distributions:
/lib - 32-bit libraries
/lib64 - 64-bit libraries

debian-based x86_64 linux distributions:
/lib - 64-bit libraries
/lib32 - 32-bit libraries
/lib64 - symbolic link to /lib

This patch will fix all cases.

=end

[yugui (Yuki Sonoda)]

• Status changed from Closed to Open

=begin

=end

[znmeb (Ed Borasky)]

=begin
Yeah ... that should work. I'll try it as soon as it makes it into the trunk. By the way, Gentoo is like Debian -- /lib is a link to /lib64 (and /usr/lib links to /usr/lib64).
=end

[ko1 (Koichi Sasada)]

• Status changed from Open to Closed

=begin
Applied in changeset r21182.
=end

[ko1 (Koichi Sasada)]

=begin
Takehiro Kubo wrote::

How about the following patch which is a piece of one I posted to #633.

Thank you. I committed it at r21182 with short ChangeLog entry. If my
ChangeLog entry is wrong, please correct it.

Regards,

// SASADA Koichi at atdot dot net

=end

[kubo (Takehiro Kubo)]

=begin
Did you apply the patch dl-test.dif?
It is a bit old than the last I posted. It lacks the following change.

--- ext/dl/test/test_import.rb (revision 21182)
+++ ext/dl/test/test_import.rb (working copy)
@@ -13,7 +13,7 @@
extern "int isdigit(int)"
extern "double atof(string)"
extern "unsigned long strtoul(char*, char **, int)"

• extern "int qsort(void*, int, int, void*)"

• extern "int qsort(void*, unsigned long, unsigned long, void*)"
  extern "int fprintf(FILE*, char*)"
  extern "int gettimeofday(timeval*, timezone*)" rescue nil

=end

[ko1 (Koichi Sasada)]

=begin
Takehiro Kubo wrote::

Issue #932 has been updated by Takehiro Kubo.

Did you apply the patch dl-test.dif?
It is a bit old than the last I posted. It lacks the following change.

Thank you. I committed it.

--
// SASADA Koichi at atdot dot net

=end