Issues with running Phoenix 1.4 app

alg

Hi guys,

I’m having some weird problems with running a Phoenix 1.4 app. I have never seen this before with Phoenix 1.3. Right after the app is built afresh I can start it with mix phx.server just fine. Then I do Ctrl-C + Ctrl-C to exit, and upon restart I will most likely get this:

 → mix phx.server
Compiling 24 files (.ex)
[info] Running MasterCoachWeb.Endpoint with cowboy 2.5.0 at http://localhost:4000

Webpack is watching the files…

[error] Ranch listener MasterCoachWeb.Endpoint.HTTP had connection process started with :cowboy_clear:start_link/4 at #PID<0.543.0> exit with reason: {:undef, [{:cowboy_http, :init, [#PID<0.440.0>, MasterCoachWeb.Endpoint.HTTP, #Port<0.44>, :ranch_tcp, %{env: %{dispatch: [{:_, [], [{:_, [], Phoenix.Endpoint.Cowboy2Handler, {MasterCoachWeb.Endpoint, []}}]}]}, stream_handlers: [Plug.Cowboy.Stream]}], []}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 249]}]}

[error] Ranch listener MasterCoachWeb.Endpoint.HTTP had connection process started with :cowboy_clear:start_link/4 at #PID<0.544.0> exit with reason: {:undef, [{:cowboy_http, :init, [#PID<0.440.0>, MasterCoachWeb.Endpoint.HTTP, #Port<0.45>, :ranch_tcp, %{env: %{dispatch: [{:_, [], [{:_, [], Phoenix.Endpoint.Cowboy2Handler, {MasterCoachWeb.Endpoint, []}}]}]}, stream_handlers: [Plug.Cowboy.Stream]}], []}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 249]}]}

[error] Ranch listener MasterCoachWeb.Endpoint.HTTP had connection process started with :cowboy_clear:start_link/4 at #PID<0.545.0> exit with reason: {:undef, [{:cowboy_http, :init, [#PID<0.440.0>, MasterCoachWeb.Endpoint.HTTP, #Port<0.46>, :ranch_tcp, %{env: %{dispatch: [{:_, [], [{:_, [], Phoenix.Endpoint.Cowboy2Handler, {MasterCoachWeb.Endpoint, []}}]}]}, stream_handlers: [Plug.Cowboy.Stream]}], []}, {:proc_lib, :init_p_do_apply, 3, [file: 'proc_lib.erl', line: 249]}]}

By trial and error, I found that it’s enough to remove compiled version of cowboy with $ rm -rf _build/dev/lib/cowboy to have another mix phx.server run the app successfully, but then on the next run I have to remove it again.

Any idea what this may be?

14 comments

/phoenix #cowboy #ranch

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2018-12-27 16:50:48 UTC

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alg

I narrowed it down a bit. It happens only when my code base recompiles. If I exit the app and then start again, nothing bad happens. If I change some code, exit and re-run, it mentions compiling some code as above and then starts dumping errors.

Post #1

OvermindDL1

Do you have any concurrent compilations happening, like say do you have an IDE or Editor open that recompiles on save too? If so then change your IDE/Editor to the MIX_ENV=test environment or something.

Post #2

alg

Nope, nothing like it. Only webpack that is usually doing it’s magic on launch and live reload that recompiles sources on change. What do you think?

Post #3

quatermain

Hi,
which Plug do you use? I think we had similar issue when we used old plugs deps.

Post #4

alg

plug 1.7.1
plug_cowboy 2.0.0

I think I’m getting another observation. If I remove ANY (not just cowboy as I stated above) compiled dependency from _build folder prior to running mix phx.server, it obviously triggers compilation of that lib and then the app. After this it all starts nicely.

Post #5

chu

Started out with 1.4 and I am also experiencing this in my brand new installation.

Post #6

alg

I actually progressed quite a bit with my research and figured that it’s beam.smp process killing my .beam files of certain packages. Not all. I used dtrace tool to trace the removal of .beam files.

I’m looking for the reasons at the moment.

@chu are you using Vim by any chance?

Post #7