Bug #7672: Segmentation faults with ibm_db gem on three versions of 1.9.3 on MacOS X and Ubuntu

• Status: Third Party's Issue
• Assignee: -
• Target version: -
• ruby -v: 1.9.3

[kgerrard (Ken Gerrard)]

=begin
I have a DB2-backed Rails 3.1 project I’m looking to update to 3.2, which means I have to use a newer version of the ibm_db gem. I have no problem running a server with the newer gem, but the intensive Cucumber tests inevitably result in a segmentation fault. I can detect no pattern to where the crashes occur.

I’m posting here ((<as recommended by Praveen Devarao at the ibm_db help forum|URL:http://rubyforge.org/forum/forum.php?thread_id=51204&forum_id=9503>)). I’m hesitant because I read the ((<HowToReport|URL:http://bugs.ruby-lang.org/projects/ruby/wiki/HowToReport>)) page and I don’t have reproducing code as required, since the segmentation faults happen in different places.

Sometimes instead of a segmentation fault, the process just hangs indefinitely.

I’ve gathered and attached logs from all combinations of the following:

• OSes: MacOS X 10.8.2, Ubuntu 12.10
• Ruby 1.9.3: p194, p286, p327
• ibm_db gem: 2.5.9, 2.5.11

Looks like I can’t attach more than ten files at once, I’ll attach the MacOS logs separately.

I also have Ubuntu core dumps if that helps, too big to attach.

Here is a sampling of crashes under 1.9.3-p194 on MacOS X:

/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.8/lib/active_model/attribute_methods.rb:431: [BUG] Segmentation fault
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/callbacks.rb:414: [BUG] Segmentation fault
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/core_ext/class/attribute.rb:98: [BUG] Segmentation fault
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/cucumber-1.1.2/lib/cucumber/ast/step_invocation.rb:59cfp consistency error - send
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/ibm_db-2.5.10/lib/active_record/connection_adapters/ibm_db_adapter.rb:1929: METHOD[BUG]
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/ibm_db-2.5.10/lib/active_record/connection_adapters/ibm_db_adapter.rb:1929: [BUG] Segmentation fault
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/json-1.7.5/lib/json/common.rb:155: [BUG] Segmentation fault
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/sprockets-2.1.3/lib/sprockets/caching.rb:46: [BUG] Segmentation fault
/Users/username/.rvm/gems/ruby-1.9.3-p194/gems/thin-1.3.1/lib/thin/headers.rb:27: [BUG] Segmentation fault

/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/securerandom.rb:140: [BUG] Segmentation fault
/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/time.rb:499: [BUG] object allocation during garbage collection phase
/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httprequest.rb:174: [BUG] cfp consistency error - call0
/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httprequest.rb:399: [BUG] probable buffer overflow: 32 for 23
/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/httpversion.rb:30: [BUG] object allocation during garbage collection phase
/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/log.rb:71: [BUG] Segmentation fault
/Users/username/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/webrick/utils.rb:214: [BUG] Segmentation fault

In case the above is inadequate, the outputs of (({ruby -v})) for each version on each OS:

MacOS X:

• (({ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin12.2.1]}))
• (({ruby 1.9.3p286 (2012-10-12 revision 37165) [x86_64-darwin12.2.1]}))
• (({ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-darwin12.2.1]}))

Ubuntu:

• (({ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-linux]}))
• (({ruby 1.9.3p286 (2012-10-12 revision 37165) [x86_64-linux]}))
• (({ruby 1.9.3p327 (2012-11-10 revision 37606) [x86_64-linux]}))

Let me know if you need anything else! I’m definitely available to provide further logs and whatever is necessary to work through this.
=end

[kgerrard (Ken Gerrard)]

• File macos-ibm_db-2.5.9-ruby-1.9.3-p327.crash macos-ibm_db-2.5.9-ruby-1.9.3-p327.crash added
• File macos-ibm_db-2.5.9-ruby-1.9.3-p194-console.txt macos-ibm_db-2.5.9-ruby-1.9.3-p194-console.txt added
• File macos-ibm_db-2.5.9-ruby-1.9.3-p194.crash macos-ibm_db-2.5.9-ruby-1.9.3-p194.crash added
• File macos-ibm_db-2.5.9-ruby-1.9.3-p286-console.txt macos-ibm_db-2.5.9-ruby-1.9.3-p286-console.txt added
• File macos-ibm_db-2.5.9-ruby-1.9.3-p286.crash macos-ibm_db-2.5.9-ruby-1.9.3-p286.crash added
• File macos-ibm_db-2.5.9-ruby-1.9.3-p327-console.txt macos-ibm_db-2.5.9-ruby-1.9.3-p327-console.txt added

Here are the MacOS logs for ibm_db 2.5.9.

[kgerrard (Ken Gerrard)]

• File macos-ibm_db-2.5.11-ruby-1.9.3-p194-console.txt macos-ibm_db-2.5.11-ruby-1.9.3-p194-console.txt added
• File macos-ibm_db-2.5.11-ruby-1.9.3-p194.crash macos-ibm_db-2.5.11-ruby-1.9.3-p194.crash added
• File macos-ibm_db-2.5.11-ruby-1.9.3-p286-console.txt macos-ibm_db-2.5.11-ruby-1.9.3-p286-console.txt added
• File macos-ibm_db-2.5.11-ruby-1.9.3-p286.crash macos-ibm_db-2.5.11-ruby-1.9.3-p286.crash added
• File macos-ibm_db-2.5.11-ruby-1.9.3-p327-console.txt macos-ibm_db-2.5.11-ruby-1.9.3-p327-console.txt added
• File macos-ibm_db-2.5.11-ruby-1.9.3-p327.crash macos-ibm_db-2.5.11-ruby-1.9.3-p327.crash added

And the MacOS logs for ibm_db 2.5.11.

[kosaki (Motohiro KOSAKI)]

If the problem only occur when using ibm_db gem, only IBM have a chance to help you. Please don't think we have ESP, please don't expect we can consult IBM product. Sorry, I don't think we can help you.

[usa (Usaku NAKAMURA)]

• Status changed from Open to Third Party's Issue

[kgerrard (Ken Gerrard)]

Yeah, I understand, that’s what I thought would happen but I posted here at the IBM person’s insistence. Oh well! Thanks.

[praveend (Praveen Devarao)]

Hi,

I am now able to reproduce this issue on my system too, while running the Rails 4 test suite. I see that the error is turning out in different places during different runs. Could you kindly let me know what causes cfp consistency error so that I can see if there is something in the ibm_db driver that is triggering this issue.

Refer to this forum post, https://www.ruby-forum.com/topic/4415496#new . I have attached the trace file too.

Thanks

Praveen

[praveend (Praveen Devarao)]

• File trace2.txt trace2.txt added

I upgraded to ruby 193 p429 and still see the cfp consistency error....I am attaching the new trace file too....

Thanks

Praven