Redmine

Please read the below additional feedback regarding the environment setup.

Environment:
Redmine version 3.0.0.stable.14068
Ruby version 2.0.0-p598 (2014-11-13) [x86_64-linux]
Rails version 4.2.0
Environment production
Database adapter Mysql2
MySql Version 5.6.22
SCM:
Subversion 1.8.8
Git 1.9.1
Filesystem
Redmine plugins:
redmine_issue_checklist 2.0.7
redmine_work_time 0.3.0

Please post log.

See the below output from the log file.

App 13321 stderr: Processing by AccountController#login as HTML
App 13321 stderr: Parameters: {"back_url"=>"http://localhost/redmine"}
App 13321 stderr: Current user: anonymous
App 13321 stderr: Rendered account/login.html.erb within layouts/base (2.7ms)
App 13321 stderr: Completed 200 OK in 13ms (Views: 11.1ms | ActiveRecord: 0.2ms)
App 13321 stderr: Started POST "/redmine/projects/gerardo001/issues" for 10.20.10.102 at 2015-05-12 15:19:22 +0000
App 13321 stderr: Processing by IssuesController#create as HTML
App 13321 stderr: Parameters: {"utf8"=>"✓", "authenticity_token"=>"pxkXhxvNQ/kmlcurfcVqEhYO0n+y2kVgmn8FRXOUlTkt5p6DXN+H9ookGEkZGYgmv78aUHLVZT4yA7c0NjJSEA==", "issue"=>{"is_private"=>"0", "tracker_id"=>"4", "subject"=>"Test Chinese Characters", "description"=>"

What is your webserver?

Ubuntu 14.04.2 LTS

Webserver means apache or etc.

Server version: Apache/2.4.7 (Ubuntu)
Server built: Jul 22 2014 14:36:38
Server's Module Magic Number: 20120211:27
Server loaded: APR 1.5.1-dev, APR-UTIL 1.5.3
Compiled using: APR 1.5.1-dev, APR-UTIL 1.5.3
Architecture: 64-bit

How to run Redmine? passenger, thin, or etc.?

Using passenger.

Can you reproduce with webrick?

$ bundle exec ruby bin/rails server -e production -p <port number> -b <ip address>

Yes same error.

Please post full logs of webrick.
I don't know what "crashes" means.

See below for full webrick log.

Started GET "/redmine" for 10.20.10.102 at 2015-05-12 16:25:41 +0000
Processing by WelcomeController#index as HTML
  Current user: gdelgado (id=42)
  Rendered news/_news.html.erb (44.4ms)
  Rendered welcome/index.html.erb within layouts/base (138.4ms)
Completed 200 OK in 308ms (Views: 152.3ms | ActiveRecord: 12.6ms)
Started GET "/redmine" for 10.20.10.102 at 2015-05-12 16:25:56 +0000
Processing by WelcomeController#index as HTML
  Current user: gdelgado (id=42)
  Rendered news/_news.html.erb (5.2ms)
  Rendered welcome/index.html.erb within layouts/base (66.3ms)
Completed 200 OK in 84ms (Views: 76.1ms | ActiveRecord: 1.0ms)
Started GET "/redmine/my/page" for 10.20.10.102 at 2015-05-12 16:25:59 +0000
Processing by MyController#page as HTML
  Current user: gdelgado (id=42)
  Rendered issues/_list_simple.html.erb (83.7ms)
  Rendered my/blocks/_issuesassignedtome.html.erb (156.0ms)
  Rendered issues/_list_simple.html.erb (17.2ms)
  Rendered my/blocks/_issuesreportedbyme.html.erb (25.0ms)
  Rendered my/page.html.erb within layouts/base (186.0ms)
Completed 200 OK in 203ms (Views: 195.5ms | ActiveRecord: 3.7ms)
Started GET "/redmine/projects/gerardo001?jump=my" for 10.20.10.102 at 2015-05-12 16:26:02 +0000
Processing by ProjectsController#show as HTML
  Parameters: {"jump"=>"my", "id"=>"gerardo001"}
  Current user: gdelgado (id=42)
  Rendered projects/_members_box.html.erb (0.9ms)
  Rendered projects/_sidebar.html.erb (1.1ms)
  Rendered projects/show.html.erb within layouts/base (11.7ms)
Completed 200 OK in 99ms (Views: 48.9ms | ActiveRecord: 6.9ms)
Started GET "/redmine/projects/gerardo001/issues/new" for 10.20.10.102 at 2015-05-12 16:26:04 +0000
Processing by IssuesController#new as HTML
  Parameters: {"project_id"=>"gerardo001"}
  Current user: gdelgado (id=42)
  Rendered issues/_form_custom_fields.html.erb (6.8ms)
  Rendered issues/_attributes.html.erb (28.9ms)
  Rendered plugins/redmine_issue_checklist/app/views/issues/_checklist_form.html.erb (1.8ms)
  Rendered issues/_form.html.erb (59.3ms)
  Rendered attachments/_form.html.erb (4.4ms)
  Rendered issues/new.html.erb within layouts/base (73.8ms)
Completed 200 OK in 120ms (Views: 91.7ms | ActiveRecord: 5.7ms)
Started POST "/redmine/projects/gerardo001/issues/new.js" for 10.20.10.102 at 2015-05-12 16:26:07 +0000
Processing by IssuesController#new as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"pLfr1W4wp4f5WnZ2wDBlSiSwt3vw8puXab1SjOXBD7AuSGLRKSJjiFXrpZSk7Id+jQF/VDD9u8nBweD9oGfImQ==", "issue"=>{"is_private"=>"0", "tracker_id"=>"4", "subject"=>"", "description"=>"", "status_id"=>"15", "priority_id"=>"4", "assigned_to_id"=>"", "parent_issue_id"=>"", "start_date"=>"2015-05-12", "due_date"=>"", "estimated_hours"=>"", "done_ratio"=>"0"}, "was_default_status"=>"15", "new_checklist"=>"", "project_id"=>"gerardo001"}
  Current user: gdelgado (id=42)
  Rendered issues/_form_custom_fields.html.erb (2.9ms)
  Rendered issues/_attributes.html.erb (15.2ms)
  Rendered plugins/redmine_issue_checklist/app/views/issues/_checklist_form.html.erb (1.7ms)
  Rendered issues/_form.html.erb (28.7ms)
  Rendered issues/new.js.erb (30.8ms)
Completed 200 OK in 57ms (Views: 36.6ms | ActiveRecord: 1.8ms)
Started POST "/redmine/projects/gerardo001/issues" for 10.20.10.102 at 2015-05-12 16:26:38 +0000
Processing by IssuesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"pLfr1W4wp4f5WnZ2wDBlSiSwt3vw8puXab1SjOXBD7AuSGLRKSJjiFXrpZSk7Id+jQF/VDD9u8nBweD9oGfImQ==", "issue"=>{"is_private"=>"0", "tracker_id"=>"4", "subject"=>"Test Chinese Characters Webrick", "description"=>" 

It seems redmine_issue_checklist 2.0.7 does not support Redmine 3.0.
https://github.com/Undev/redmine_issue_checklist/releases

But I have no problems posting any other issues within Redmine.. Looking at the logs, this seems to be related to the MySql character set for the table?

In addition, looking at the "master" branch Redmine 3.0 support is outlined there.

https://github.com/Undev/redmine_issue_checklist

Upgraded the checklist to 2.0.8 and it's still erroring out with the same error above.