Elixir / OTP version:

$ elixir -v
Erlang/OTP 21 [erts-10.0] [source] [smp:4:4] [ds:4:4:10] [async-threads:1] [hipe]

Elixir 1.10.3 (compiled with Erlang/OTP 21)

Phoenix version:

$ mix phx.new --version
Phoenix v1.5.0

Trying to create a database (after mix phx.new name --no-webpack):

$ mix ecto.create

===> Compiling cowboy
Function: request_process/3
===> Compiling src/cowboy_stream_h.erl failed
src/cowboy_stream_h.erl:none: internal error in sys_core_dsetel;
crash reason: {case_clause,
    {'EXIT',
        {{case_clause,
             #{0 => 1,1 => 1,2 => 1,4 => 1,5 => 1,6 => 1,10 => 0,
               'Reason' => 1}},
         [{sys_core_dsetel,visit,2,[{file,"sys_core_dsetel.erl"},{line,98}]},
          {lists,mapfoldl,3,[{file,"lists.erl"},{line,1354}]},
          {lists,mapfoldl,3,[{file,"lists.erl"},{line,1355}]},
          {sys_core_dsetel,visit,2,[{file,"sys_core_dsetel.erl"},{line,188}]},
          {lists,mapfoldl,3,[{file,"lists.erl"},{line,1354}]},
          {lists,mapfoldl,3,[{file,"lists.erl"},{line,1355}]},
          {sys_core_dsetel,visit,2,[{file,"sys_core_dsetel.erl"},{line,188}]},
          {sys_core_dsetel,visit,2,
              [{file,"sys_core_dsetel.erl"},{line,144}]}]}}}

  in function  compile:'-select_passes/2-anonymous-2-'/3 (compile.erl, line 585)
  in call from compile:'-internal_comp/5-anonymous-1-'/3 (compile.erl, line 349)
  in call from compile:fold_comp/4 (compile.erl, line 376)
  in call from compile:internal_comp/5 (compile.erl, line 360)
  in call from compile:'-do_compile/2-anonymous-0-'/2 (compile.erl, line 177)
  in call from compile:'-do_compile/2-anonymous-1-'/1 (compile.erl, line 190)

** (Mix) Could not compile dependency :cowboy, "/home/henrique/.asdf/installs/elixir/1.10.3-otp-21/.mix/rebar3 bare compile --paths="/home/henrique/Desktop/Project
s/materic/materic_demo/_build/dev/lib/*/ebin"" command failed. You can recompile this dependency with "mix deps.compile cowboy", update it with "mix deps.update co
wboy" or clean it with "mix deps.clean cowboy"

When i execute the command with rebar:

$ /home/henrique/.asdf/installs/elixir/1.10.3-otp-21/.mix/rebar3 bare compile --paths="/home/henrique/Desktop/Projects/materic/demo/_build/dev/lib/*/ebin"

===> Uncaught error in rebar_core. Run with DEBUG=1 to see stacktrace or consult rebar3.crashdump
===> When submitting a bug report, please include the output of `rebar3 report "your command"`

With DEBUG=1:

$ DEBUG=1 /home/henrique/.asdf/installs/elixir/1.10.3-otp-21/.mix/rebar3 bare compile --
paths="/home/henrique/Desktop/Projects/materic/demo/_build/dev/lib/*/ebin"

===> Expanded command sequence to be run: []
===> Provider: {default,do}
===> Expanded command sequence to be run: [{default,app_discovery},
                                                  {bare,compile}]
===> Provider: {default,app_discovery}
===> Provider: {bare,compile}
===> Uncaught error in rebar_core. Run with DEBUG=1 to see stacktrace or consult rebar3.crashdump
===> Uncaught error: {badmatch,[]}
===> Stack trace to the error location:
[{rebar_prv_bare_compile,do,1,
                         [{file,"/tmp/cirrus-ci-build/src/rebar_prv_bare_compile.erl"},
                          {line,60}]},
 {rebar_core,do,2,
             [{file,"/tmp/cirrus-ci-build/src/rebar_core.erl"},{line,154}]},
 {rebar_prv_do,do_task,5,
               [{file,"/tmp/cirrus-ci-build/src/rebar_prv_do.erl"},{line,87}]},
 {rebar_core,do,2,
             [{file,"/tmp/cirrus-ci-build/src/rebar_core.erl"},{line,154}]},
 {rebar3,run_aux,2,[{file,"/tmp/cirrus-ci-build/src/rebar3.erl"},{line,182}]},
 {rebar3,main,1,[{file,"/tmp/cirrus-ci-build/src/rebar3.erl"},{line,66}]},
 {escript,run,2,[{file,"escript.erl"},{line,758}]},
 {escript,start,1,[{file,"escript.erl"},{line,277}]}]
===> When submitting a bug report, please include the output of `rebar3 report "your command"`

Some interesting things:

• I also tried mix local.rebar --force and mix local.rebar and got the same error.
• It creates the database in other existent phoenix projects in the same machine using mix ecto.create.
• I also tried to remove / purge and reinstall both Erlang, Elixir and Phoenix.
• I also tried to install others phx_new versions / archives.
• The OS is an Ubuntu 16 / 32bits.
• It happened “out of the blue”.
• Of course other mix tasks aren’t working. But only in new phoenix projects.