Issue #18024 has been updated by tagomoris (Satoshi TAGOMORI).

File ruby_2021-08-24-203317_Moris-Macbook-Air.crash added

As a follow-up of this report, I found that the same thing happens when:
* a Ractor accepts connections, then send connections to other Ractor workers
* Ractor workers read/write from/to connections, then close those

This is a very common server design, so this problem will be caused in many different places in the future.

Script:
```ruby
require 'socket'

worker_num = 2

sock = TCPServer.new("127.0.0.1", 8228)
workers = worker_num.times.map do |i|
  Ractor.new(i) do |index|
    while conn = Ractor.receive
      begin
        data = conn.readline
        conn.write "HTTP/1.1 200 OK\r\n\r\n"
        conn.close
        conn = nil
      rescue => e
        p "Worker|#{index} #{e.full_message}"
      end
    end
  end
end

p "Starting a listener"
listener = Ractor.new(sock, workers) do |sock, workers|
  workers_num = workers.size
  i = 0
  begin
    while conn = sock.accept
      worker = workers[i % workers_num]
      worker.send(conn, move: true)
      i += 1
    end
  rescue => e
    p "Listener| #{e.full_message}"
  end
end

workers.each{|w| w.take}
p "End"
```

Run it, then send HTTP requests to 127.0.0.1:8228 with 2 or more parallel connections/threads like `wrk -d 3s https:://127.0.0.1:8228/`.
https://github.com/wg/wrk

Crash report:
```
snippets/ractor_server.rb:12: [BUG] Segmentation fault at 0x0000000000000000
ruby 3.1.0dev (2021-08-24T07:18:24Z master bcc5a2b67e) [arm64-darwin20]

-- Crash Report log information --------------------------------------------
   See Crash Report log file in one of the following locations:             
     * ~/Library/Logs/DiagnosticReports                                     
     * /Library/Logs/DiagnosticReports                                      
   for more details.                                                        
Don't forget to include the above Crash Report log file in bug reports.     

-- Control frame information -----------------------------------------------
c:0003 p:---- s:0014 e:000013 CFUNC  :close
c:0002 p:0024 s:0010 e:000009 BLOCK  snippets/ractor_server.rb:12 [FINISH]
c:0001 p:---- s:0003 e:000002 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
snippets/ractor_server.rb:12:in `block (2 levels) in <main>'
snippets/ractor_server.rb:12:in `close'

-- Machine register context ------------------------------------------------
 x[0: 0x0000000000000000 x[1: 0x000000014300ac00 x[2: 0x0000000000000000
 x[3: 0x0000000000000000 x[4: 0x000000016d05e734 x[5: 0x0000000000000003
 x[6: 0x000000000000000a x[7: 0x0000000000000000 x[1: 0x0000000000000000
 x[1: 0x000000016d05e798 x[2: 0x000000000000000d x[2: 0x000000014300ac00
 x[2: 0x000000010325af10 x[2: 0x000000014300ad60 x[2: 0x0000000000000000
 x[2: 0x0000000000000002 x[2: 0x0000000143937580 x[2: 0x0000000000000000
 x[2: 0x0000000055550083  lr: 0x000000010312ae30  fp: 0x000000016d05e780
  sp: 0x000000016d05e730

-- Other runtime information -----------------------------------------------

* Loaded script: snippets/ractor_server.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 fiber.so
    3 rational.so
    4 complex.so
    5 ruby2_keywords.rb
    6 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/arm64-darwin20/enc/encdb.bundle
    7 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/arm64-darwin20/enc/trans/transdb.bundle
    8 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/arm64-darwin20/rbconfig.rb
    9 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/compatibility.rb
   10 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/defaults.rb
   11 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/deprecate.rb
   12 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/errors.rb
   13 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/unknown_command_spell_checker.rb
   14 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/exceptions.rb
   15 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/basic_specification.rb
   16 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/stub_specification.rb
   17 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/text.rb
   18 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/user_interaction.rb
   19 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/specification_policy.rb
   20 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/util/list.rb
   21 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/platform.rb
   22 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/version.rb
   23 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/requirement.rb
   24 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/specification.rb
   25 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/util.rb
   26 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/dependency.rb
   27 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/core_ext/kernel_gem.rb
   28 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/arm64-darwin20/monitor.bundle
   29 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/monitor.rb
   30 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb
   31 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/core_ext/kernel_warn.rb
   32 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems.rb
   33 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems/path_support.rb
   34 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight/version.rb
   35 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight/base.rb
   36 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight/formatter.rb
   37 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight/core_ext.rb
   38 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/error_highlight.rb
   39 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/version.rb
   40 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/core_ext/name_error.rb
   41 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/levenshtein.rb
   42 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/jaro_winkler.rb
   43 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checker.rb
   44 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
   45 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
   46 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/name_error_checkers.rb
   47 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/method_name_checker.rb
   48 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/key_error_checker.rb
   49 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/null_checker.rb
   50 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/tree_spell_checker.rb
   51 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/spell_checkers/require_path_checker.rb
   52 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean/formatters/plain_formatter.rb
   53 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/did_you_mean.rb
   54 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/arm64-darwin20/socket.bundle
   55 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/arm64-darwin20/io/wait.bundle
   56 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/socket.rb

* Process memory map:

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103358000-10335c000 rw- /usr/lib/dyld
10335c000-1033dc000 r-x /usr/lib/dyld
1033dc000-1033e4000 r-- /usr/lib/dyld
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[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

Abort trap: 6
```


----------------------------------------
Bug #18024: Ractor crashes when connections are closed in multiple Ractors
https://bugs.ruby-lang.org/issues/18024#change-93467

* Author: tagomoris (Satoshi TAGOMORI)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
When multiple Ractors will accept and close connections, that script caused the crash shown below.
This pattern is taken when we want to distribute the overhead of `accept` to multiple CPU cores.

Script:
```
require 'socket'

try_times = 10
worker_num = 2

listener = TCPServer.new("127.0.0.1", 8228)
listener.listen(100)
workers = worker_num.times.map do |i|
  Ractor.new(i, listener.dup) do |index, sock|
    while conn = sock.accept
      begin
        data = conn.read
        p "Worker|#{index} Data: #{data}"
        conn.close
      rescue => e
        p "Worker|#{index} #{e.full_message}"
      end
    end
  rescue => e
    $stderr.puts "Error, worker#{index}: #{e.full_message}"
  end
end

p "Starting a sender"
sender = Ractor.new(try_times) do |tries|
  tries.times.each do
    s = TCPSocket.new("127.0.0.1", 8228)
    s.write("yay")
  ensure
    s.close rescue nil
  end
end

sender.take
workers.each{|w| w.take}
p "End"
```

Crash report:
```
<internal:ractor>:267: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues.
"Starting a sender"
"Worker|1 Data: yay"
snippets/ractor_accept.rb:30: [BUG] Bus Error at 0x00000014000001f5
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20]

-- Crash Report log information --------------------------------------------
   See Crash Report log file under the one of following:                    
     * ~/Library/Logs/DiagnosticReports                                     
     * /Library/Logs/DiagnosticReports                                      
   for more details.                                                        
Don't forget to include the above Crash Report log file in bug reports.     

-- Control frame information -----------------------------------------------
c:0006 p:---- s:0023 e:000022 CFUNC  :close
c:0005 p:0028 s:0019 e:000017 BLOCK  snippets/ractor_accept.rb:30 [FINISH]
c:0004 p:---- s:0014 e:000013 CFUNC  :times
c:0003 p:---- s:0011 e:000010 CFUNC  :each
c:0002 p:0008 s:0007 e:000006 BLOCK  snippets/ractor_accept.rb:26 [FINISH]
c:0001 p:---- s:0003 e:000002 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
snippets/ractor_accept.rb:26:in `block in <main>'
snippets/ractor_accept.rb:26:in `each'
snippets/ractor_accept.rb:26:in `times'
snippets/ractor_accept.rb:30:in `block (2 levels) in <main>'
snippets/ractor_accept.rb:30:in `close'

-- Other runtime information -----------------------------------------------

* Loaded script: snippets/ractor_accept.rb

* Loaded features:

    0 enumerator.so
    1 thread.rb
    2 rational.so
    3 complex.so
    4 ruby2_keywords.rb
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   17 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/specification_policy.rb
   18 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/util/list.rb
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   25 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_gem.rb
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   32 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/version.rb
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270000000-280000000 r--
fc0000000-1000000000 ---
1000000000-7000000000 ---
[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

Abort trap: 6
```


---Files--------------------------------
ruby_2021-07-06-231613_Moris-Macbook-Air.crash (35.9 KB)
ruby_2021-08-24-203317_Moris-Macbook-Air.crash (17.4 KB)


-- 
https://bugs.ruby-lang.org/