Bug #633: dl segfaults on x86_64-linux systems

• Status: Closed
• Assignee: takano32 (Mitsuhiro TAKANO)
• Target version: 1.9.1 Release Candidate

[floering (Benjamin Floering)]

=begin
Tested systems: RHEL3_64, RHEL4_64, and RHEL5_64. All segfault running tests in ext/dl/test. Confirmed that this is not as big an issue on 32bit (no segfault, but two errors).

$ ruby test_all.rb
Loaded suite test_all
Started
..../ruby/ext/dl/test/test_dl2.rb:78: [BUG] Segmentation fault
ruby 1.9.0 (2008-10-11 revision 19752) [x86_64-linux]

-- control frame ----------
c:0020 p:---- s:0074 b:0074 l:000073 d:000073 CFUNC :call
c:0019 p:0101 s:0070 b:0070 l:000380 d:000380 METHOD /ruby/ext/dl/test/test_dl2.rb:78
c:0018 p:0051 s:0064 b:0064 l:000063 d:000063 METHOD /ruby19/lib/ruby/1.9.0/test/unit/testcase.rb:81
c:0017 p:0017 s:0059 b:0059 l:000052 d:000058 BLOCK /ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:34
c:0016 p:---- s:0058 b:0058 l:000057 d:000057 FINISH :inherited
c:0015 p:---- s:0056 b:0056 l:000055 d:000055 CFUNC :each
c:0014 p:0032 s:0053 b:0053 l:000052 d:000052 METHOD /ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:33
c:0013 p:0017 s:0048 b:0048 l:000041 d:000047 BLOCK /ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:34
c:0012 p:---- s:0047 b:0047 l:000046 d:000046 FINISH :(null)
c:0011 p:---- s:0045 b:0045 l:000044 d:000044 CFUNC :each
c:0010 p:0032 s:0042 b:0042 l:000041 d:000041 METHOD /ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:33
c:0009 p:0146 s:0037 b:0037 l:000ac8 d:000ac8 METHOD /ruby19/lib/ruby/1.9.0/test/unit/ui/testrunnermediator.rb:46
c:0008 p:0010 s:0028 b:0028 l:000027 d:000027 METHOD /ruby19/lib/ruby/1.9.0/test/unit/ui/console/testrunner.rb:67
c:0007 p:0029 s:0025 b:0025 l:000024 d:000024 METHOD /ruby19/lib/ruby/1.9.0/test/unit/ui/console/testrunner.rb:41
c:0006 p:0028 s:0022 b:0022 l:000021 d:000021 METHOD /ruby19/lib/ruby/1.9.0/test/unit/ui/testrunnerutilities.rb:29
c:0005 p:0062 s:0017 b:0017 l:000016 d:000016 METHOD /ruby19/lib/ruby/1.9.0/test/unit/autorunner.rb:213
c:0004 p:0080 s:0013 b:0013 l:000012 d:000012 METHOD /ruby19/lib/ruby/1.9.0/test/unit/autorunner.rb:12
c:0003 p:0046 s:0005 b:0004 l:001bc8 d:000003 BLOCK /ruby19/lib/ruby/1.9.0/test/unit.rb:278
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH :inherited
c:0001 p:0000 s:0002 b:0002 l:000001 d:000001 TOP

DBG> : "/ruby/ext/dl/test/test_dl2.rb:78:in call'" DBG> : "/ruby/ext/dl/test/test_dl2.rb:78:in test_callback'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testcase.rb:81:in run'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:34:in block in run'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:33:in each'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:33:in run'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:34:in block in run'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:33:in each'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/testsuite.rb:33:in run'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/ui/testrunnermediator.rb:46:in run_suite'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/ui/console/testrunner.rb:67:in start_mediator'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/ui/console/testrunner.rb:41:in start'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/ui/testrunnerutilities.rb:29:in run'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/autorunner.rb:213:in run'"
DBG> : "/ruby19/lib/ruby/1.9.0/test/unit/autorunner.rb:12:in run'" DBG> : "/ruby19/lib/ruby/1.9.0/test/unit.rb:278:in block in <top (required)>'"
: 884 segmentation fault (core dumped) ruby test_all.rb

dl 64 bit was working in 1.8. Are we dropping support for 64 bit in 1.9?
=end

[radarek (Radosław Bułat)]

=begin
I want to confirm this issue. I have exactly the same output (of course paths are different).

$ ruby1.9 --version
ruby 1.9.0 (2008-10-14 revision 19786) [x86_64-linux]

=end

[rogerdpack (Roger Pack)]

=begin
Here's my results from 32-bit OS X.
ruby19 test_all.rb
test_all.rb
Loaded suite test_all
Started

Finished in 0.000820 seconds.

0 tests, 0 assertions, 0 failures, 0 errors, 0 skips

=end

[ko1 (Koichi Sasada)]

• Assignee set to nobu (Nobuyoshi Nakada)

=begin

=end

[yugui (Yuki Sonoda)]

• Assignee changed from nobu (Nobuyoshi Nakada) to takano32 (Mitsuhiro TAKANO)
• Target version set to 1.9.1 Release Candidate

=begin

=end

[yugui (Yuki Sonoda)]

• Due date set to 12/24/2008
• Assignee deleted (takano32 (Mitsuhiro TAKANO))

=begin

=end

[znmeb (Ed Borasky)]

• File ruby-configure.log ruby-configure.log added
• File R-make.log R-make.log added
• File ruby-install.log ruby-install.log added
• File ruby-test.log ruby-test.log added

=begin
I'm trying to reproduce this on my system. This machine is an Athlon64 X2 (dual-core x86_64). OS is openSUSE 11.1, 2.6.27 kernel, and gcc is "gcc (SUSE Linux) 4.3.2 [gcc-4_3-branch revision 141291]". I downloaded the Ruby source via subversion from trunk. The "autoconf", "configure", "make" and "make install" all ran fine, as did "make test". So I tried the test above. No segfaults, but I did get an interesting error message:

znmeb@DreamScape:~/Packages> export PATH=~/test/bin/:$PATH
znmeb@DreamScape:~/Packages> cd ruby/ext/dl/test/
znmeb@DreamScape:~/Packages/ruby/ext/dl/test> which ruby
/home/znmeb/test/bin/ruby
znmeb@DreamScape:~/Packages/ruby/ext/dl/test> ruby --version
ruby 1.9.1 (2008-12-26 patchlevel-5000 trunk 21067) [x86_64-linux]
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>

In other words, it looks like I have linked against the wrong "libc" -- a 32-bit one! Could that be what's happening on the 64-bit Red Hat systems too? I think the "libc" should be "/lib64/libc.so.6":

znmeb@DreamScape:~/Packages> locate libc.so
/lib/libc.so.6
/lib64/libc.so.6
/usr/lib64/libc.so
znmeb@DreamScape:~/Packages> file /lib/libc.so.6
/lib/libc.so.6: symbolic link to libc-2.9.so' znmeb@DreamScape:~/Packages> file /lib64/libc.so.6 /lib64/libc.so.6: symbolic link to libc-2.9.so'
znmeb@DreamScape:~/Packages> file /usr/lib64/libc.so
/usr/lib64/libc.so: ASCII C program text
znmeb@DreamScape:~/Packages> file /lib/libc-2.9.so
/lib/libc-2.9.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.4, dynamically linked (uses shared libs), stripped
znmeb@DreamScape:~/Packages> file /lib64/libc-2.9.so
/lib64/libc-2.9.so: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), for GNU/Linux 2.6.4, dynamically linked (uses shared libs), stripped
znmeb@DreamScape:~/Packages>

I'm attaching the output of the "make" step if that's any help. Incidentally, the default installed Ruby on openSUSE 11.1 is 1.8.7:

znmeb@DreamScape:~/Packages> which ruby
/usr/bin/ruby
znmeb@DreamScape:~/Packages> ruby --version
ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux]
znmeb@DreamScape:~/Packages>

=end

[znmeb (Ed Borasky)]

• File ruby-make.log ruby-make.log added

=begin
Oops ... attached the wrong log file -- here's the right one!
=end

[febuiles (Federico Builes)]

=begin
Ed: This segfaults in Ubuntu 8.10 x86_x64 too so I think the libc issue might be related to OpenSuse.
=end

[znmeb (Ed Borasky)]

=begin
A little good news:

1. I can get rid of the library issue on my system.
2. I found the error in "/ext/dl/test/test_base.rb" that's causing the library issue. I don't know about how to port this to other distros, though.

1 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"

Other distros must symlink "/lib" to "/lib64". In any event when I changed the constants to point to "/lib64" the library errors went away. So there probably needs to be two branches in the "case" -- one for 32-bit Linux and one for 64-bit Linux. I'll go ahead and file another bug to that effect specific to openSUSE 11.1 / x64

The bad news is that if I fix the library issue, I get segfaults now. But that's really good news; "gdb" should be able to help narrow this down. I'll see if I can get a C-level traceback next.

=end

[znmeb (Ed Borasky)]

• File ruby-segfault.log ruby-segfault.log added
• File ruby-c-backtrace.txt ruby-c-backtrace.txt added

=begin
OK ... I have a core dump file and a C level traceback with "gdb". I've attached the files, rather than putting the details in line. Enough stuff was "optimized out" that I think I'm going to recompile with "-O0" (no optimization) and see if that helps / makes it go away / makes it easier to find.
=end

[znmeb (Ed Borasky)]

• File ruby-c-backtrace-noopt.txt ruby-c-backtrace-noopt.txt added

=begin
Here's a C-level backtrace with no optimization. It looks a lot better -- I can see the call from Ruby out to the system library now, and the whole path to the segfault. It's around line #11:

#10 0x00007f8bd53d584c in qsort_r () from /lib64/libc.so.6
#11 0x00007f8bd4ce23c0 in rb_dlcfunc_call (self=11574080, ary=11573400) at cfunc.c:276
#12 0x0000000000508cbc in call_cfunc (func=0x7f8bd4ce200b <rb_dlcfunc_call>, recv=11574080, len=1, argc=1, argv=0x7f8bd62631b0) at vm_insnhelper.c:290

I'm out of ideas at this point. Does the C-level backtrace mean anything to anyone else??

=end

[znmeb (Ed Borasky)]

• File ruby-c-backtrace-noopt.txt ruby-c-backtrace-noopt.txt added

=begin
Here's a C-level backtrace with no optimization. It looks a lot better -- I can see the call from Ruby out to the system library now, and the whole path to the segfault. It's around line #11:

#10 0x00007f8bd53d584c in qsort_r () from /lib64/libc.so.6
#11 0x00007f8bd4ce23c0 in rb_dlcfunc_call (self=11574080, ary=11573400) at cfunc.c:276
#12 0x0000000000508cbc in call_cfunc (func=0x7f8bd4ce200b <rb_dlcfunc_call>, recv=11574080, len=1, argc=1, argv=0x7f8bd62631b0) at vm_insnhelper.c:290

I'm out of ideas at this point. Does the C-level backtrace mean anything to anyone else??

=end

[znmeb (Ed Borasky)]

• File ruby-c-backtrace-noopt.txt ruby-c-backtrace-noopt.txt added

=begin
Here's a C-level backtrace with no optimization. It looks a lot better -- I can see the call from Ruby out to the system library now, and the whole path to the segfault. It's around line #11:

#10 0x00007f8bd53d584c in qsort_r () from /lib64/libc.so.6
#11 0x00007f8bd4ce23c0 in rb_dlcfunc_call (self=11574080, ary=11573400) at cfunc.c:276
#12 0x0000000000508cbc in call_cfunc (func=0x7f8bd4ce200b <rb_dlcfunc_call>, recv=11574080, len=1, argc=1, argv=0x7f8bd62631b0) at vm_insnhelper.c:290

I'm out of ideas at this point. Does the C-level backtrace mean anything to anyone else??

=end

[znmeb (Ed Borasky)]

• File ruby-c-backtrace-noopt.txt ruby-c-backtrace-noopt.txt added

=begin
Here's a C-level backtrace with no optimization. It looks a lot better -- I can see the call from Ruby out to the system library now, and the whole path to the segfault. It's around line #11:

#10 0x00007f8bd53d584c in qsort_r () from /lib64/libc.so.6
#11 0x00007f8bd4ce23c0 in rb_dlcfunc_call (self=11574080, ary=11573400) at cfunc.c:276
#12 0x0000000000508cbc in call_cfunc (func=0x7f8bd4ce200b <rb_dlcfunc_call>, recv=11574080, len=1, argc=1, argv=0x7f8bd62631b0) at vm_insnhelper.c:290

I'm out of ideas at this point. Does the C-level backtrace mean anything to anyone else??

=end

[kubo (Takehiro Kubo)]

=begin
Here is a patch to fix the problem at line 78 of ext/dl/test/test_dl2.rb.

--- test_dl2.rb (revision 21104)
+++ test_dl2.rb (working copy)
@@ -75,7 +75,7 @@
buff = "foobarbaz"
cb = set_callback(TYPE_INT,2){|x,y| CPtr.new(x)[0] <=> CPtr.new(y)[0]}
cfunc = CFunc.new(@libc (Eugene Pimenov)['qsort'], TYPE_VOID, 'qsort')

• cfunc.call([buff, buff.size, 1, cb].pack("pI!I!L!").unpack("l!*"))

• cfunc.call([buff, buff.size, 1, cb].pack("pL!L!L!").unpack("l!*"))
  assert_equal('aabbfoorz', buff)
  end

The type of qsort's second and third arguments is size_t.

Note that this fixes only one problem. The test fails as before.

=end

[kubo (Takehiro Kubo)]

• File dl-test.dif dl-test.dif added

=begin
Here is a patch to fix all segv faults.

=end

[takano32 (Mitsuhiro TAKANO)]

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

=begin
Applied in changeset r21110.
=end

[znmeb (Ed Borasky)]

=begin
I'm still seeing a segfault in r21112:

which ruby
/home/znmeb/test/bin/ruby
ruby --version
ruby 1.9.1 (2008-12-28 patchlevel-5000 trunk 21112) [x86_64-linux]
cd ruby/ext/dl/test/
ruby test_all.rb 2>&1 | tee ~/Packages/ruby-segfault.log
Loaded suite test_all
Started
...........F./home/znmeb/test/lib/ruby/1.9.1/dl/func.rb:31: [BUG] Segmentation fault
ruby 1.9.1 (2008-12-28 patchlevel-5000 trunk 21112) [x86_64-linux]

-- control frame ----------
c:0015 p:---- s:0063 b:0063 l:000062 d:000062 CFUNC :call
c:0014 p:0053 s:0059 b:0059 l:000058 d:000058 METHOD /home/znmeb/test/lib/ruby/1.9.1/dl/func.rb:31
c:0013 p:0073 s:0052 b:0052 l:000051 d:000051 METHOD /home/znmeb/Packages/ruby/ext/dl/test/test_func.rb:18
c:0012 p:0041 s:0045 b:0045 l:000044 d:000044 METHOD /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:436
c:0011 p:0096 s:0039 b:0039 l:000019 d:000038 BLOCK /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:415
c:0010 p:---- s:0033 b:0033 l:000032 d:000032 FINISH
c:0009 p:---- s:0031 b:0031 l:000030 d:000030 CFUNC :each
c:0008 p:0026 s:0028 b:0028 l:000019 d:000027 BLOCK /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:409
c:0007 p:---- s:0025 b:0025 l:000024 d:000024 FINISH
c:0006 p:---- s:0023 b:0023 l:000022 d:000022 CFUNC :each
c:0005 p:0080 s:0020 b:0020 l:000019 d:000019 METHOD /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:408
c:0004 p:0153 s:0015 b:0015 l:000014 d:000014 METHOD /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:388
c:0003 p:0040 s:0007 b:0007 l:000dd8 d:000006 BLOCK /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:329
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
c:0001 p:0000 s:0002 b:0002 l:000bc8 d:000bc8 TOP

-- Ruby level backtrace information-----------------------------------------
/home/znmeb/test/lib/ruby/1.9.1/dl/func.rb:31:in call' /home/znmeb/test/lib/ruby/1.9.1/dl/func.rb:31:in call'
/home/znmeb/Packages/ruby/ext/dl/test/test_func.rb:18:in test_isdigit' /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:436:in run'
/home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:415:in block (2 levels) in run_test_suites' /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:409:in each'
/home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:409:in block in run_test_suites' /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:408:in each'
/home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:408:in run_test_suites' /home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:388:in run'
/home/znmeb/test/lib/ruby/1.9.1/minitest/unit.rb:329:in `block in autorun'

-- C level backtrace information -------------------------------------------
0x51ba89 ruby(rb_vm_bugreport+0x179) [0x51ba89]
0x54fb3a ruby [0x54fb3a]
0x54fc47 ruby(rb_bug+0xf1) [0x54fc47]
0x4af46b ruby [0x4af46b]
0x7f9499593a90 /lib64/libpthread.so.0 [0x7f9499593a90]
0x7f94989b75fe /lib64/libc.so.6(isdigit+0x1e) [0x7f94989b75fe]
0x7f94982d0fc3 /home/znmeb/test/lib/ruby/1.9.1/x86_64-linux/dl.so(rb_dlcfunc_call+0x3fb8) [0x7f94982d0fc3]
0x5104a5 ruby [0x5104a5]
0x5102cc ruby [0x5102cc]
0x50fa9e ruby [0x50fa9e]
0x50b382 ruby [0x50b382]
0x5186b9 ruby [0x5186b9]
0x5173f7 ruby [0x5173f7]
0x51747e ruby [0x51747e]
0x51452c ruby [0x51452c]
0x5144fd ruby(rb_yield+0x39) [0x5144fd]
0x52c46b ruby(rb_ary_each+0x8a) [0x52c46b]
0x510486 ruby [0x510486]
0x5102cc ruby [0x5102cc]
0x50fa9e ruby [0x50fa9e]
0x50b382 ruby [0x50b382]
0x5186b9 ruby [0x5186b9]
0x5173f7 ruby [0x5173f7]
0x51747e ruby [0x51747e]
0x51452c ruby [0x51452c]
0x5144fd ruby(rb_yield+0x39) [0x5144fd]
0x52c46b ruby(rb_ary_each+0x8a) [0x52c46b]
0x510486 ruby [0x510486]
0x5102cc ruby [0x5102cc]
0x50fa9e ruby [0x50fa9e]
0x50b382 ruby [0x50b382]
0x5186b9 ruby [0x5186b9]
0x5173f7 ruby [0x5173f7]
0x51758c ruby(vm_invoke_proc+0x10c) [0x51758c]
0x41de07 ruby(rb_proc_call+0x9f) [0x41de07]
0x41ac69 ruby(rb_call_end_proc+0x1d) [0x41ac69]
0x41af8c ruby(rb_exec_end_proc+0x1b3) [0x41af8c]
0x41b24f ruby [0x41b24f]
0x41b33a ruby(ruby_cleanup+0xaf) [0x41b33a]
0x41b670 ruby(ruby_run_node+0x73) [0x41b670]
0x419e7b ruby(main+0x4f) [0x419e7b]
0x7f94989aa586 /lib64/libc.so.6(__libc_start_main+0xe6) [0x7f94989aa586]
0x419d69 ruby [0x419d69]

[NOTE]
You may encounter a bug of Ruby interpreter. Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

cd ~/Packages
znmeb@DreamScape:~/Packages>

I'll do a C-level backtrace and see if it's in the same place.
=end

[znmeb (Ed Borasky)]

• File isdigit-trace.txt isdigit-trace.txt added

=begin
Different place ... it's calling "isdigit" now. C-level backtrace is attached
=end

[yugui (Yuki Sonoda)]

• Status changed from Closed to Open
• Assignee set to takano32 (Mitsuhiro TAKANO)

=begin

=end

[kubo (Takehiro Kubo)]

=begin
A patch again which I previously attached excluding changeset r21110
and including a few new issues.

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"
  Index: ext/dl/test/test_import.rb
  ===================================================================
  --- ext/dl/test/test_import.rb (revision 21112)
  +++ ext/dl/test/test_import.rb (working copy)
  @@ -11,10 +11,10 @@

  extern "void strcpy(char, char*)"
  extern "int isdigit(int)"

• extern "float atof(string)"

• extern "double atof(string)"
  extern "unsigned long strtoul(char*, char **, int)"

• extern "int qsort(void*, int, int, void*)"
• extern "void fprintf(FILE*, char*)"

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

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

  QsortCallback = bind("void qsort_callback(void, void*)", :temp)
  Index: ext/dl/test/test_func.rb
  ===================================================================
  --- ext/dl/test/test_func.rb (revision 21112)
  +++ ext/dl/test/test_func.rb (working copy)
  @@ -24,7 +24,7 @@
  end

  def test_atof()

•  f = Function.new(CFunc.new(@libc['atof'], TYPE_FLOAT, 'atof'),
  

•  f = Function.new(CFunc.new(@libc['atof'], TYPE_DOUBLE, 'atof'),
                    [TYPE_VOIDP])
   r = f.call("12.34")
   assert_match(12.00..13.00, r)
  

Index: ext/dl/dl.h

--- ext/dl/dl.h (revision 21112)
+++ ext/dl/dl.h (working copy)
@@ -50,29 +50,65 @@
stack[15],stack[16],stack[17],stack[18],stack[19]

#define DLSTACK_PROTO0
-#define DLSTACK_PROTO1 DLSTACK_TYPE
-#define DLSTACK_PROTO2 DLSTACK_PROTO1, DLSTACK_TYPE
-#define DLSTACK_PROTO3 DLSTACK_PROTO2, DLSTACK_TYPE
-#define DLSTACK_PROTO4 DLSTACK_PROTO3, DLSTACK_TYPE
-#define DLSTACK_PROTO4 DLSTACK_PROTO3, DLSTACK_TYPE
-#define DLSTACK_PROTO5 DLSTACK_PROTO4, DLSTACK_TYPE
-#define DLSTACK_PROTO6 DLSTACK_PROTO5, DLSTACK_TYPE
-#define DLSTACK_PROTO7 DLSTACK_PROTO6, DLSTACK_TYPE
-#define DLSTACK_PROTO8 DLSTACK_PROTO7, DLSTACK_TYPE
-#define DLSTACK_PROTO9 DLSTACK_PROTO8, DLSTACK_TYPE
-#define DLSTACK_PROTO10 DLSTACK_PROTO9, DLSTACK_TYPE
-#define DLSTACK_PROTO11 DLSTACK_PROTO10, DLSTACK_TYPE
-#define DLSTACK_PROTO12 DLSTACK_PROTO11, DLSTACK_TYPE
-#define DLSTACK_PROTO13 DLSTACK_PROTO12, DLSTACK_TYPE
-#define DLSTACK_PROTO14 DLSTACK_PROTO13, DLSTACK_TYPE
-#define DLSTACK_PROTO14 DLSTACK_PROTO13, DLSTACK_TYPE
-#define DLSTACK_PROTO15 DLSTACK_PROTO14, DLSTACK_TYPE
-#define DLSTACK_PROTO16 DLSTACK_PROTO15, DLSTACK_TYPE
-#define DLSTACK_PROTO17 DLSTACK_PROTO16, DLSTACK_TYPE
-#define DLSTACK_PROTO18 DLSTACK_PROTO17, DLSTACK_TYPE
-#define DLSTACK_PROTO19 DLSTACK_PROTO18, DLSTACK_TYPE
-#define DLSTACK_PROTO20 DLSTACK_PROTO19, DLSTACK_TYPE
+#define DLSTACK_PROTO1_ DLSTACK_TYPE
+#define DLSTACK_PROTO2_ DLSTACK_PROTO1_, DLSTACK_TYPE
+#define DLSTACK_PROTO3_ DLSTACK_PROTO2_, DLSTACK_TYPE
+#define DLSTACK_PROTO4_ DLSTACK_PROTO3_, DLSTACK_TYPE
+#define DLSTACK_PROTO4_ DLSTACK_PROTO3_, DLSTACK_TYPE
+#define DLSTACK_PROTO5_ DLSTACK_PROTO4_, DLSTACK_TYPE
+#define DLSTACK_PROTO6_ DLSTACK_PROTO5_, DLSTACK_TYPE
+#define DLSTACK_PROTO7_ DLSTACK_PROTO6_, DLSTACK_TYPE
+#define DLSTACK_PROTO8_ DLSTACK_PROTO7_, DLSTACK_TYPE
+#define DLSTACK_PROTO9_ DLSTACK_PROTO8_, DLSTACK_TYPE
+#define DLSTACK_PROTO10_ DLSTACK_PROTO9_, DLSTACK_TYPE
+#define DLSTACK_PROTO11_ DLSTACK_PROTO10_, DLSTACK_TYPE
+#define DLSTACK_PROTO12_ DLSTACK_PROTO11_, DLSTACK_TYPE
+#define DLSTACK_PROTO13_ DLSTACK_PROTO12_, DLSTACK_TYPE
+#define DLSTACK_PROTO14_ DLSTACK_PROTO13_, DLSTACK_TYPE
+#define DLSTACK_PROTO14_ DLSTACK_PROTO13_, DLSTACK_TYPE
+#define DLSTACK_PROTO15_ DLSTACK_PROTO14_, DLSTACK_TYPE
+#define DLSTACK_PROTO16_ DLSTACK_PROTO15_, DLSTACK_TYPE
+#define DLSTACK_PROTO17_ DLSTACK_PROTO16_, DLSTACK_TYPE
+#define DLSTACK_PROTO18_ DLSTACK_PROTO17_, DLSTACK_TYPE
+#define DLSTACK_PROTO19_ DLSTACK_PROTO18_, DLSTACK_TYPE
+#define DLSTACK_PROTO20_ DLSTACK_PROTO19_, DLSTACK_TYPE

+/*

• • Add ",..." as the last argument.
• • This is required for variable argument functions such
• • as fprintf() on x86_64-linux.
• • http://refspecs.linuxfoundation.org/elf/x86_64-abi-0.95.pdf
• • page 19:
• • For calls that may call functions that use varargs or stdargs
• • (prototype-less calls or calls to functions containing ellipsis
• • (...) in the declaration) %al is used as hidden argument to
• • specify the number of SSE registers used.
• */
  +#define DLSTACK_PROTO1 DLSTACK_PROTO1_, ...
  +#define DLSTACK_PROTO2 DLSTACK_PROTO2_, ...
  +#define DLSTACK_PROTO3 DLSTACK_PROTO3_, ...
  +#define DLSTACK_PROTO4 DLSTACK_PROTO4_, ...
  +#define DLSTACK_PROTO4 DLSTACK_PROTO4_, ...
  +#define DLSTACK_PROTO5 DLSTACK_PROTO5_, ...
  +#define DLSTACK_PROTO6 DLSTACK_PROTO6_, ...
  +#define DLSTACK_PROTO7 DLSTACK_PROTO7_, ...
  +#define DLSTACK_PROTO8 DLSTACK_PROTO8_, ...
  +#define DLSTACK_PROTO9 DLSTACK_PROTO9_, ...
  +#define DLSTACK_PROTO10 DLSTACK_PROTO10_, ...
  +#define DLSTACK_PROTO11 DLSTACK_PROTO11_, ...
  +#define DLSTACK_PROTO12 DLSTACK_PROTO12_, ...
  +#define DLSTACK_PROTO13 DLSTACK_PROTO13_, ...
  +#define DLSTACK_PROTO14 DLSTACK_PROTO14_, ...
  +#define DLSTACK_PROTO14 DLSTACK_PROTO14_, ...
  +#define DLSTACK_PROTO15 DLSTACK_PROTO15_, ...
  +#define DLSTACK_PROTO16 DLSTACK_PROTO16_, ...
  +#define DLSTACK_PROTO17 DLSTACK_PROTO17_, ...
  +#define DLSTACK_PROTO18 DLSTACK_PROTO18_, ...
  +#define DLSTACK_PROTO19 DLSTACK_PROTO19_, ...
  +#define DLSTACK_PROTO20 DLSTACK_PROTO20_, ...

#define DLSTACK_ARGS0(stack)
#define DLSTACK_ARGS1(stack) stack[0]
#define DLSTACK_ARGS2(stack) DLSTACK_ARGS1(stack), stack[1]
Index: ext/dl/lib/dl/stack.rb

--- ext/dl/lib/dl/stack.rb (revision 21112)
+++ ext/dl/lib/dl/stack.rb (working copy)
@@ -121,20 +121,26 @@
@template = ""
addr = 0
types.each{|t|

•    orig_addr = addr
  

•    addr = align(orig_addr, ALIGN_MAP[t])
  

•    d = addr - orig_addr
  

•    if( d > 0 )
  

•      @template << "x#{d}"
  

•    end
  

•    addr = add_padding(addr, ALIGN_MAP[t])
     @template << PACK_MAP[t]
     addr += SIZE_MAP[t]
   }
  

•  addr = add_padding(addr, ALIGN_MAP[SIZEOF_VOIDP])
   if( addr % SIZEOF_VOIDP == 0 )
     @size = addr / SIZEOF_VOIDP
   else
     @size = (addr / SIZEOF_VOIDP) + 1
   end
  

  end
• def add_padding(addr, align)

•  orig_addr = addr
  

•  addr = align(orig_addr, align)
  

•  d = addr - orig_addr
  

•  if( d > 0 )
  

•    @template << "x#{d}"
  

•  end
  

•  addr
  

• end
  end
  end

• ext/dl/test/test_base.rb

  /lib/libc.so is i386 binary on x86_64 redhat.

  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 will work on the following combinations.

  • i386 ruby on i386 linux
  • i386 ruby on redhat-based x86_64 linux
  • i386 ruby on debian-based x86_64 linux
  • x86_64 ruby on redhat-based x86_64 linux
  • x86_64 ruby on debian-based x86_64 linux

• ext/dl/test/test_import.rb

  atof()'s return value is double.
  The test at test_import.rb:133 fails on x86_64 linux without this
  fix.

  The types of qsort's second and third argument are size_t.
  But DL::Importer cannot handle size_t. So I replaced them
  to unsigned long. It happens to work on 64-bit little-endian
  binary, but not on 64-bit big-endian binary without this fix.

  fprintf()'s return value is int.
  I don't know what difference is made by this change, but
  it will be safe.

• ext/dl/test/test_func.rb

  atof()'s return value is double.
  The test at test_func.rb:30 fails on x86_64 linux without this fix.

• ext/dl/dl.h

  The process may be dumped by segv at test_import.rb:67 without this
  fix. It depends on the value of %al register at cfunc.c:276.
  The reason is described in a comment of the patch.

• ext/dl/lib/dl/stack.rb

  The process may be dumped by segv at test_func.rb:18 without this
  fix. If the last argument's size is less than SIZEOF_VOIDP, the
  value is deleted by .unpack('l!*') at stack.rb:24.

=end

[ko1 (Koichi Sasada)]

• Status changed from Open to Closed

=begin
Applied in changeset r21182.
=end