Strange cow_boy timeout error

Questions / Help
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1

Since upgraded to Debian 10, I am facing a very strange error on DB connection.

from time to time, I would see an error

[error] #PID<0.21892.0> running AuroraWeb.Endpoint (cowboy_protocol) terminated
Server: localhost:80 (http)
Request: POST /graphql
** (exit) exited in: :gen_server.call(#PID<0.468.0>, {:checkout, #Reference<0.688527683.3513253890.14916>, true, 15000}, 5000)
    ** (EXIT) time out

Screenshot from 2020-01-22 12-03-19
Screenshot from 2020-01-22 12-03-191443×638 89.8 KB

Which I have noticed they are all from Elixir.DBConnection.Connection:init/1.
If I kill the process in :observe.start, of course the process will get restarted and it works as usual.

How do I get debugging started? There is really not much helpful info in the error message.

2

Please list your Erlang and Elixir versions. If you can, use the latest version of the Ecto library as well – I suspect you are getting DB request timeouts.

3

I am using

  • Elixir (1.6.5)
  • Erlang/OTP 20

I will try to upgrade Ecto to v3 and see if the problem goes away.