Invalid memory access (signal 11) at address 0x7fffdf289ff8

[pcoenen]

Hello,

I got the following error while compiling my crystal code

Invalid memory access (signal 11) at address 0x7fffdf289ff8
[0x453c86] *CallStack::print_backtrace:Int32 +118
[0x44853b] __crystal_sigfault_handler +75
[0x7fcd27381390] ???
[0x4a0554] *Torrent#files:(Array(Tuple(Int32, String)) | Nil) +4
[0x4a0563] *Torrent#files:(Array(Tuple(Int32, String)) | Nil) +19 (261838 times)
[0x43b8d1] __crystal_main +1649
[0x448c76] *_crystal_main<Int32, Pointer(Pointer(UInt8))>:Nil +6
[0x4a0aa6] *Crystal::main_user_code<Int32, Pointer(Pointer(UInt8))>:Nil +6
[0x4a0962] *Crystal::main<Int32, Pointer(Pointer(UInt8))>:Int32 +50
[0x446876] main +6
[0x7fcd26940830] __libc_start_main +240
[0x43b189] _start +41
[0x0] ???

This occurs when I run the following code, the error is caused by the torrent.cr and the Torrent class
torrent.zip

require "./torrent/ctorrent_client"
require "./torrent/torrent"

client = CTorrent_Client.new
puts client.get_files("example.torrent")

torrent = Torrent.new("example.torrent")
puts torrent.files

I use version 0.24.2

[asterite]

It seems client.get_files invokes itself recursively until infinity. Check the stack trace, "(261838 times)". This is just a regular stack overflow (and it's happening at runtime, not when compiling).

[asterite]

I mean, Torrent#files, which is shown in the stack trace.

[ysbaddaden]

[0x4a0563] *Torrent#files:(Array(Tuple(Int32, String)) | Nil) +19 (261838 times)

It gets repeated 261,838 times.

[ysbaddaden]

Duplicate of #271.

[pcoenen]

Torrent.files looks like this

 def files
        if files.is_a? Nil
            client = CTorrent_Client.new
            @files = client.get_files(@path_to_torrent)
        end
        return @files
    end

[pcoenen]

How can I return the @files variable ? Without calling the files method?

[ysbaddaden]

The problem is that you're checking files instead of @files:

def files
  @files ||= CTorrent_Client.new.get_files(@path_to_torrent)
end