[erlang-questions] try to find the crash report (a challenge)

[Joel Reymont]

https://github.com/wagerlabs/mod_crash

This is a super-simple httpd plugin module that crashes.

I cannot find the crash report, can you?

Help!

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[Joel Reymont]

Could this be a problem with the supervision tree of inets?

[Yurii Rashkovskii]

The problem is in httpd. httpd_request_handler has this:

    PROCESSED = (catch Module:Function([Data | Args])),

so it will swallow your crash. Besides, the case statement right after that seems to be fairly wrong. It has an all-catch clause NewMFA, and it assumes PROCESSED is a new MFA if it is nothing that matched before. That means, an EXIT tuple will be treated as a new MFA. Unless I'm missing something, this is just wrong.

[Joel Reymont]

You can get the crash reports in /tmp/error.log (in my case).

This works if the list of httpd modules is set to [mod_log, mod_crash].

There's still nothing shown via regular SASL channels.

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[Ahmed Omar]

Well, there won't be crash report anywhere because inets does catch the exception in httpd_resonse.erl 

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@spawn_think

[Ahmed Omar]

No. It's just that the exception is caught in httpd_response.erl

traverse_modules(ModData,[Module|Rest]) ->

    ?hdrd("traverse modules", [{callback_module, Module}]), 

    case (catch apply(Module, do, [ModData])) of

[Ahmed Omar]

And what you get in error.log is just a formatted message after catching the exception

case (catch apply(Module, do, [ModData])) of

{'EXIT', Reason} ->

   ?hdrd("traverse modules - exit", [{reason, Reason}]), 

   String = 

lists:flatten(

 io_lib:format("traverse exit from apply: ~p:do => ~n~p",

[Module, Reason])),