Heroku Error H10 (App crashed)

My Heroku app has crashed, and all i'm getting out of the logs is Error H10 (App crashed)

2012-03-28T14:11:56+00:00 heroku[router]: Error H10 (App crashed) -> GET www.devsite.com/ dyno= queue= wait= service= status=503 bytes=
2012-03-28T14:11:56+00:00 heroku[nginx]: - - [28/Mar/2012:14:11:56 +0000] "GET / HTTP/1.1" 503 607 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_3) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.83 Safari/535.11" www.devsite.com

Any idea how to draw more information out of heroku logs - or find out what is wrong?


I had a similar problem, every time I hit the server, I just got these 2 useless lines of output in the logs.

When I ran:

heroku restart

It ended up showing me more output that let me track down my issue (related to migrating to cedar) (the app was crashing on deploy it appears, never fully starting up, but not showing an error during the deploying process, as would usually occur).

According to their Developer documentation:

Check your app’s backtrace in the logs to find out what you need to do to fix the problem.


I had similar issues and it was related to the dynos. H10 error.

Just run:

heroku restart

Fixed it for me!

Heroku sometimes have H10 errors completely on their side like today - then you can utilize heroku-dyno-restarter tool to have an automated solution - it will heroku restart your app until it works )

Had a similar problem and the error was masked, running a rails c on heroku gave us the reason for the crash

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