MacOSX(10.9.1 configure ipv6: automatically) + Ruby(2.1.0) + redis-rb(3.0.7) + localhost => crash

gistfile1.txt

fk82% ruby -v
ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin13.0]
fk82% irb -rredis
irb(main):001:0> Redis::VERSION
=> "3.0.7"
irb(main):002:0> redis = Redis.new(host: 'fe80::1%lo0')
=> #<Redis client v3.0.7 for redis://fe80::1%lo0:6379/0>
irb(main):003:0> irb(main):003:0> redis.get 'foo'
Users/fukayatsu/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/redis-3.0.7/lib/redis/connection/ruby.rb:129: [BUG] rb_sys_fail_str(connect(2) for [fe80::1%lo0]:6379) - errno == 0
ruby 2.1.0p0 (2013-12-25 revision 44422) [x86_64-darwin13.0]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:
     * ~/Library/Logs/CrashReporter
     * /Library/Logs/CrashReporter
     * ~/Library/Logs/DiagnosticReports
     * /Library/Logs/DiagnosticReports
   for more details.

-- Control frame information -----------------------------------------------
c:0041 p:---- s:0160 e:000159 CFUNC  :connect_nonblock
c:0040 p:0062 s:0156 e:000155 BLOCK  /Users/fukayatsu/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/redis-3.0.7/lib/redis/connection/ruby.rb:129
c:0039 p:0071 s:0153 e:000152 METHOD /Users/fukayatsu/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/redis-3.0.7/lib/redis/connection/ruby.rb:121
c:0038 p:0015 s:0145 e:000144 BLOCK  /Users/fukayatsu/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/redis-3.0.7/lib/redis/connection/ruby.rb:162 [FINISH]
....


fk82% ruby -v                                                                          
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.4.0]                                                                     
fk82% irb -rredis                                                               
irb(main):001:0> Redis::VERSION
=> "3.0.7"
irb(main):002:0> redis = Redis.new(host: 'fe80::1%lo0')
=> #<Redis client v3.0.7 for redis://fe80::1%lo0:6379/0>
irb(main):003:0> redis.get 'foo'
Redis::CannotConnectError: Error connecting to Redis on fe80::1%lo0:6379 (ECONNREFUSED)

MacOSXのネットワーク設定でconfigure ipv6: automaticallyにしてると、RubyでSocket.getaddrinfo("localhost", nil)したときに"::1"が最初に返ってくるので、Ruby2.1.0でRedis.new(host: 'localhost')とかするとこんなクラッシュに遭遇することがある

解決方法

• Redis.new(host: 'localhost') => Redis.new(host: '127.0.0.1') or Redis.new

OR

• configure ipv6: automatically => link-local only

related:

Don't hardcode Ruby connection to IPv4 by pietern · Pull Request #394 · redis/redis-rb
redis/redis-rb#394

Bug #9352: [BUG] rb_sys_fail_str(connect(2) for [fe80::1%lo0]:3000) - errno == 0 - ruby-trunk - Ruby Issue Tracking System
https://bugs.ruby-lang.org/issues/9352

Hello,

I got this bug using locahost. I replaced by 127.0.0.1 and it works fine.

nice :)