[ruby-core:26422] [Bug #2309] Segfault, repeatable testcase, possibly related to [2295], [2019], [1937].

[Dominik Elsbroek-3]

Bug #2309: Segfault, repeatable testcase, possibly related to [2295], [2019], [1937].
http://redmine.ruby-lang.org/issues/show/2309

Author: Jxtps 435
Status: Open, Priority: Normal
Category: core
ruby -v: ruby 1.9.1p243 (2009-07-16 revision 24175) [x86_64-linux]

Ruby 1.9.1 segfaults when calling ActiveRecord::Base.transaction, dump attached (that's what the line with the error does).

Testcase is very repeatable (happens every time I run my specs), but slightly non-deterministic: changing a few lines of code will change in which particular test it happens (multiple tests go through the same code-path, doesn't always happen every time you go through the same path), and though it is usually in the same spot in the code it has sometimes happened in other spots (deeper within the same call-chain).

Unfortunately the code is for a commercial project and I can't share it. Sorry. I can work with someone from the ruby-core community to e.g. run debug versions of ruby on the test case if that is of use.


Environment:

- Ubuntu 9.04 on a basic intel box
- Rails 2.3.4
- DB: PostgreSQL, with ruby-pg binding

*** LOCAL GEMS ***

aasm (2.1.3)
actionmailer (2.3.4)
actionpack (2.3.4)
activerecord (2.3.4)
activeresource (2.3.4)
activesupport (2.3.4)
bluecloth (2.0.5)
builder (2.1.2)
capistrano (2.5.9)
cucumber (0.3.104, 0.3.103)
diff-lcs (1.1.2)
fastthread (1.0.7)
gemcutter (0.1.6)
haml (2.2.5)
highline (1.5.1)
hoe (2.3.3)
hpricot (0.8.1)
json (1.1.9)
json_pure (1.1.9)
mislav-will_paginate (2.3.11)
net-scp (1.0.2)
net-sftp (2.0.2)
net-ssh (2.0.15)
net-ssh-gateway (1.0.1)
nokogiri (1.3.3)
passenger (2.2.5)
pg (0.8.0)
polyglot (0.2.9)
postgres-pr (0.6.1)
rack (1.0.0)
rails (2.3.4)
rake (0.8.7)
right_aws (1.10.0)
right_http_connection (1.2.4)
rspec (1.2.8)
rspec-rails (1.2.7.1)
rubyforge (2.0.0)
rubygems-update (1.3.5)
spork (0.7.2)
syntax (1.0.0)
term-ansicolor (1.0.4)
test-unit (2.0.3, 1.2.3)
treetop (1.4.2)
webrat (0.5.3)


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[Nobuyoshi Nakada-2]

Hi,

At Fri, 30 Oct 2009 09:13:36 +0900,
Jxtps 435 wrote in [ruby-core:26422]:
> Testcase is very repeatable (happens every time I run my
> specs), but slightly non-deterministic: changing a few lines
> of code will change in which particular test it happens
> (multiple tests go through the same code-path, doesn't always
> happen every time you go through the same path), and though
> it is usually in the same spot in the code it has sometimes
> happened in other spots (deeper within the same call-chain).

Sounds like a GC bug.

> Unfortunately the code is for a commercial project and I
> can't share it. Sorry. I can work with someone from the
> ruby-core community to e.g. run debug versions of ruby on the
> test case if that is of use.

Could you show the backtrace with gdb?

--
Nobu Nakada

[Dominik Elsbroek-3]

Issue #2309 has been updated by Jxtps 435.

File core_dump_backtrace.txt added
File ruby_stack_trace_for_core_dump.txt added

Sorry for the delay - despite watching this issue I did not get an email notification? (nothing in the spam folder)

In any case, attached is the result of connecting to the ruby process with gdb, continuing it and then issuing the "where" command - I hope it helps!
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http://redmine.ruby-lang.org/issues/show/2309

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