The rails s command is showing this issue bellow; I have no idea what it is? this project use to run fine; I haven't change much either. My env: The weird thing is that I execute the same command in another project and it run just fine. I am missing something? If I try the command along it work but

Linux Question

The rails s command is showing this issue bellow; I have no idea what it is? this project use to run fine; I haven’t change much either.

[vns@betito perseus]$ rails s
/usr/include/c++/8/bits/stl_vector.h:932: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = v8::Handle<v8::Value>; _Alloc = std::allocator<v8::Handle<v8::Value> >; std::vector<_Tp, _Alloc>::reference = v8::Handle<v8::Value>&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed.
Aborted (core dumped)

My env:

Fedora 28
ruby 2.5.1
rails 5.2.0
libg++ 8.1.1

The weird thing is that I execute the same command in another project and it run just fine.

I am missing something?

[vns@betito perseus]$ rails 
The most common rails commands are:
 generate     Generate new code (short-cut alias: "g")
 console      Start the Rails console (short-cut alias: "c")
 server       Start the Rails server (short-cut alias: "s")
 test         Run tests except system tests (short-cut alias: "t")
 test:system  Run system tests
 dbconsole    Start a console for the database specified in config/database.yml
              (short-cut alias: "db")

 new          Create a new Rails application. "rails new my_app" creates a
              new application called MyApp in "./my_app"


All commands can be run with -h (or --help) for more information.
In addition to those commands, there are:

/usr/include/c++/8/bits/stl_vector.h:932: std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::operator[](std::vector<_Tp, _Alloc>::size_type) [with _Tp = v8::Handle<v8::Value>; _Alloc = std::allocator<v8::Handle<v8::Value> >; std::vector<_Tp, _Alloc>::reference = v8::Handle<v8::Value>&; std::vector<_Tp, _Alloc>::size_type = long unsigned int]: Assertion '__builtin_expect(__n < this->size(), true)' failed.
Aborted (core dumped)

If I try the command along it work but it got broke at the end.

Answer

It seems to be this ‘gem “less-rails”‘; thanks for the help

I removed the gem and the server run fine; I have to check if there is a old version for this that works.

the issue is related to this _GLIBCXX_ASSERTIONS compilation flag was turned on by default in Fedora 28; and it causing a lot of software malfunctions.

Fedora 28 wiki

Bug 1574797

more updates: I found the issue and it is related to ‘therubyracer’ lib There is a bug with the use of vector out of bounds.

to this line: return &vector[0];

on file: ext/v8/rr.h#L223

so now that the libstdc++ 8.1 is checking with assertions ON.

I tested it using my own branch library and it is working.

rails s command issue

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Answer