A flaky and odd compilation error about telemetry HOT 16 CLOSED

How did I know that was what was missing?

===> Uncaught error: undef
===> Stack trace to the error location:
[{erl_syntax,type,[{attribute,2,module,telemetry_sup}],[]},

Error you got is saying function erl_syntax:type/4 is undefined. So my best guess was that it likely was because the whole module wasn't there and that usually ends up being because of distro packages.

from telemetry.

The path is just the escript having been built on my machine. Only older rebar3 versions were built that way, so you should upgrade your rebar3. Though I think mix forces you to use their version and I don't know when they last upgraded the one they will install.

Can you describe the issue more? Your title says "flaky", do you mean it doesn't always happen?

from telemetry.

This error happens from time to time on our CI. Clearing build cache helps.

from telemetry.

It would happen if a .erl files is somehow not readable. That line it is on is simply opening a source file in read mode.

I doubt it changes anything but it would still be nice if you could switch to using the latest rebar3, 3.13.0.

This issue recently has only come up from people using mix as far as I can tell, which is on an old version of rebar3.

from telemetry.

I used the following command as a workaround:

MIX_REBAR3=`which rebar3` MIX_ENV=dev mix deps.compile telemetry

For sure, you should have newer version of rebar3 be installed in the system

from telemetry.

I hit this in my Gitlab CI builds using mix as well - the mix version of rebar3 was indeed older (3.6.3 I believe?). I used rebar3 local upgrade to get 3.13, and the issue went away.

For others curious, here is the Gitlab .gitlab-ci-yml line I added:

default:
  image: "hexpm/elixir:1.10.2-erlang-22.2.8-alpine-3.11.3"
  before_script:
    - mix local.rebar --force && mix local.hex --force
    - ~/.mix/rebar3 local upgrade && cp ~/.cache/rebar3/bin/rebar3 ~/.mix/rebar3 && ~/.mix/rebar3 --version

from telemetry.

Mix has upgraded the rebar3 it installs so I think this can be closed.

from telemetry.

Hi everyone, sorry if it's not correct to add this is on a closed issue, but I've followed all the suggestions and still not able to compile telemetry.

root@ceac44765919:~# elixir --version
Erlang/OTP 21 [erts-10.2.4] [source] [64-bit] [smp:2:2] [ds:2:2:10] [async-threads:1]

Elixir 1.7.4 (compiled with Erlang/OTP 21)

root@ceac44765919:~# /root/.mix/rebar3 version
rebar 3.13.2 on Erlang/OTP 21 Erts 10.2.4

root@ceac44765919:~# DEBUG=1 mix deps.compile telemetry
===> 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}
===> Compiling telemetry
===> run_hooks("/root/deps/telemetry", pre_hooks, compile) -> no hooks defined

===> run_hooks("/root/deps/telemetry", pre_hooks, erlc_compile) -> no hooks defined

===> Uncaught error in rebar_core. Run with DEBUG=1 to see stacktrace or consult rebar3.crashdump
===> Uncaught error: undef
===> Stack trace to the error location:
[{erl_syntax,type,[{attribute,2,module,telemetry_sup}],[]},
 {rebar_compiler_erl,parse_attrs,3,
                     [{file,"/tmp/cirrus-ci-build/src/rebar_compiler_erl.erl"},
                      {line,250}]},
 {rebar_compiler_erl,dependencies,3,
                     [{file,"/tmp/cirrus-ci-build/src/rebar_compiler_erl.erl"},
                      {line,81}]},
 {rebar_compiler,modify_dag,6,
                 [{file,"/tmp/cirrus-ci-build/src/rebar_compiler.erl"},
                  {line,368}]},
 {rebar_compiler,'-update_dag_fun/3-fun-0-',5,
                 [{file,"/tmp/cirrus-ci-build/src/rebar_compiler.erl"},
                  {line,380}]},
 {lists,foldl,3,[{file,"lists.erl"},{line,1263}]},
 {rebar_compiler,init_dag,7,
                 [{file,"/tmp/cirrus-ci-build/src/rebar_compiler.erl"},
                  {line,274}]},
 {rebar_compiler,run,3,
                 [{file,"/tmp/cirrus-ci-build/src/rebar_compiler.erl"},
                  {line,77}]}]
===> When submitting a bug report, please include the output of `rebar3 report "your command"`
** (Mix) Could not compile dependency :telemetry, "/root/.mix/rebar3 bare compile --paths "/root/_build/dev/lib/*/ebin"" command failed. You can recompile this dependency with "mix deps.compile telemetry", update it with "mix deps.update telemetry" or clean it with "mix deps.clean telemetry"

Any insights?

from telemetry.

@pacoguzman how did you install Erlang/Elixir? If you pull up an Erlang shell what does syntax_tools:module_info(). give you? Or :syntax_tools.module_info() in Elixir shell.

from telemetry.

That is not available in our installation

Interactive Elixir (1.7.4) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :syntax_tools.module_info()
** (UndefinedFunctionError) function :syntax_tools.module_info/0 is undefined (module :syntax_tools is not available)
    :syntax_tools.module_info()

We got a clean debian image and install using available packages

RUN apt-get --no-install-recommends -yqq install \
    # ....
    elixir \
    erlang-crypto \
    erlang-inets \
    erlang-dev \
    erlang-parsetools \
    # ....

So I guess we missed some extra package, isn't it?

from telemetry.

After installing erlang-syntax-tools it's working fine. So thanks for point to it.

from telemetry.

Good. And yea, it is best not to use debian packages. I wish they didn't provide them at all because they cause so many problems.

from telemetry.

Yes, this image is close to be removed and we'll follow another approach which won't use packages. How do you know that was a requirement?

from telemetry.

I want to note that I'm seeing the same error with an ASDF installation. Not sure if there's anything funky with my setup because I'd expect this to be more commonly reported if it's affecting all ASDF installations. Reported it on asdf-erlang: asdf-vm/asdf-erlang#155

from telemetry.

@axelson are you positive you are using the asdf installed Erlang and not a linux distro installed version? To be sure uninstall any distro package for erlang you might also have.

from telemetry.

I am positive that I am using the asdf installed Erlang since I which erl returns ~/.asdf/shims/erl and iex prints Erlang/OTP 22 when I have set asdf to 22.3.4.1.

However I did have the erlang-23.0-1 package (arch linux) installed. However, after removing it I still get the same error when trying to access :syntax_tools:

jason@jdesktop /t/erl-test2> asdf local erlang 22.3.4.1
jason@jdesktop /t/erl-test2> asdf local elixir 1.10.3-otp-22
jason@jdesktop /t/erl-test2> iex
Erlang/OTP 22 [erts-10.7.2.1] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [hipe]

Interactive Elixir (1.10.3) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :syntax_tools.module_info()
** (UndefinedFunctionError) function :syntax_tools.module_info/0 is undefined (module :syntax_tools is not available)
  :syntax_tools.module_info()
iex(1)>
BREAK: (a)bort (A)bort with dump (c)ontinue (p)roc info (i)nfo
     (l)oaded (v)ersion (k)ill (D)b-tables (d)istribution
^C⏎                                                                                                                 
jason@jdesktop /t/erl-test2> sudo pacman -R erlang
[sudo] password for jason:
checking dependencies...

Packages (1) erlang-23.0-1

Total Removed Size:  106.26 MiB

:: Do you want to remove these packages? [Y/n]
:: Processing package changes...
(1/1) removing erlang                                                 [#######################################] 100%
:: Running post-transaction hooks...
(1/2) Reloading system manager configuration...
(2/2) Arming ConditionNeedsUpdate...
jason@jdesktop /t/erl-test2> iex
Erlang/OTP 22 [erts-10.7.2.1] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [hipe]

Interactive Elixir (1.10.3) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> :syntax_tools.module_info()
** (UndefinedFunctionError) function :syntax_tools.module_info/0 is undefined (module :syntax_tools is not available)
  :syntax_tools.module_info()

from telemetry.