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Heroku Rails app crashes immediately on HTTP request

My Rails application works fine locally but not on Heroku .. I can call heroku run rake db:migrate

and heroku run rake db:reset

without incident, but as soon as I go out HTTP-request to the application, it immediately crashes. Here's the output heroku info

:

Addons:        Basic Logging, Basic Release Management, Shared Database 5MB
Database Size: 1M
Git URL:       git@heroku.com:blazing-dawn-5661.git
Repo Size:     52M
Slug Size:     53M
Stack:         cedar
Web URL:       http://blazing-dawn-5661.herokuapp.com/

Here is the output heroku logs

after issuing an HTTP request to the application (nothing seems particularly useful here):

2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f
]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[we
b.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x519499]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_yield+0x66) [0x521d56]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x51307f]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby(rb_ary_each+0x45) [0x533735]
2012-03-30T13:02:13+00:00 app[web.1]: /usr/local/bin/ruby() [0x515546]
2012-03-30T13:02:13+00:00 app[web.1]: 
2012-03-30T13:02:13+00:00 app[web.1]: [NOTE]
2012-03-30T13:02:13+00:00 app[web.1]: You may have encountered a bug in the Ruby interpreter or extension libraries.
2012-03-30T13:02:13+00:00 app[web.1]: Bug reports are welcome.
2012-03-30T13:02:13+00:00 app[web.1]: For details: http://www.ruby-lang.org/bugreport.html
2012-03-30T13:02:13+00:00 app[web.1]: 
2012-03-30T13:02:14+00:00 heroku[web.1]: Process exited with status 139
2012-03-30T13:02:14+00:00 heroku[web.1]: State changed from up to crashed
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Check it:

Ruby 1.9.3 and Rails 3.2 on Heroku

Herokus' latest stack, "Celadon Cedar", supports Rails 3.2, but installs Ruby 1.9.2 by default. Ruby 1.9.3 is recommended for Rails 3.2.

You can configure your Heroku environment to use Ruby 1.9.3.



Note. Heroku makes it clear that Ruby 1.9.3 on Heroku is experimental, which means "no support, ruby_version will change in the future and this feature may change or be removed without warning." In response to an inquiry on January 31, 2012, Heroku said there is "no time yet" for full support for Ruby 1.9.3.

Note. Installing Ruby 1.9.3 on Heroku earlier (before March 19, 2012) required the heroku-labs plugin to be installed. The heroku-labs plugin has been deprecated and its functionality is now included in the heroku client gem.

Taken from here

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