App crashing following deployment - no child process

[darrenklein]

Hello, thank you so much for all of your hard work on this project. I've recently started experimenting with using mix releases for my Phoenix app on Heroku, and I have been trying to deploy using this buildpack. However, while my app is in the process of starting up, I'm getting an "Error waiting for process to terminate: No child processes" and the app is crashing. I'm wondering if you've experienced this before, and if you have any insight into how I might address it...

First off, my buildpacks are as follows:

1. https://gitlab.com/my_name/ssh-key-private-buildpack.git
2. https://github.com/HashNuke/heroku-buildpack-elixir.git
3. https://github.com/gjaldon/heroku-buildpack-phoenix-static.git
4. https://github.com/heroku/exec-buildpack
5. https://github.com/chrismcg/heroku-buildpack-elixir-mix-release.git

And my Elixir buildpack config:

erlang_version=22.3
elixir_version=1.10.2
always_rebuild=false

Immediately after the deployment process finished, I ran heroku logs --tail to watch what was happening - here are some excerpts from the logs:

2020-09-01T18:37:54.866744+00:00 app[api]: Deploy f9fdcadd by user [email protected]:37:54.866744+00:00 app[api]: Release v509 created by user [email protected]:38:07.148587+00:00 app[web.1]: [heroku-exec] Starting
2020-09-01T18:38:12.000000+00:00 app[api]: Build succeeded2020-09-01T18:38:17.082248+00:00 app[web.1]: 18:38:17.082 [error] calling logger:remove_handler(default) failed: :error {:badmatch, {:error, {:not_found, :default}}}
2020-09-01T18:38:17.111338+00:00 app[web.1]: 18:38:17.111 [info] Application lager started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.112393+00:00 app[web.1]: 18:38:17.112 [info] Application postgrex started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.112481+00:00 app[web.1]: 18:38:17.112 [info] Application jsx started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.112805+00:00 app[web.1]: 18:38:17.112 [info] Application util_lib started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.115758+00:00 app[web.1]: 18:38:17.115 [info] {"module":"Elixir.Analytics.Log","message":"Starting log write cache service","line":83,"function":"init","app":"analytics_data"}
2020-09-01T18:38:17.116040+00:00 app[web.1]: 18:38:17.115 [info] {"tables":["event","stream","network"],"module":"Elixir.Analytics.DB.Writer","message":"Starting db writer service","line":42,"function":"init","directory":"./analytics_data_cache","app":"analytics_data"}
2020-09-01T18:38:17.116265+00:00 app[web.1]: 18:38:17.116 [info] Application analytics_data started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.116717+00:00 app[web.1]: 18:38:17.116 [info] Application auth started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.117060+00:00 app[web.1]: 18:38:17.116 [info] Application ex_aws started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.117154+00:00 app[web.1]: 18:38:17.116 [info] Application ex_aws_dynamo started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.117265+00:00 app[web.1]: 18:38:17.116 [info] Application jason started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:17.117535+00:00 app[web.1]: 18:38:17.117 [info] Application ecto_adapters_dynamodb started on node 'my_app@af5ab302-038e-4599-8633-b5add9b8a2a3'
2020-09-01T18:38:18.038472+00:00 app[web.1]: 18:38:18.038 [warning] lager_error_logger_h dropped 73 messages in the last second that exceeded the limit of 50 messages/sec
2020-09-01T18:38:20.474657+00:00 app[web.1]: 18:38:20.474 [info] tzdata release in place is from a file last modified Tue, 26 Mar 2019 05:40:14 GMT. Release file on server was last modified Fri, 24 Apr 2020 04:15:20 GMT.
2020-09-01T18:38:22.300606+00:00 app[web.1]: 18:38:22.300 [info] Tzdata has updated the release from 2019a to 2020a
2020-09-01T18:39:05.453594+00:00 app[web.1]: Error waiting for process to terminate: No child processes
2020-09-01T18:39:05.519132+00:00 heroku[web.1]: State changed from starting to crashed

Let me know if there's anything else I can provide to help illustrate my issue. Again, thanks so much!