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Bug #18024

open

Ractor crashes when connections are closed in multiple Ractors

Added by tagomoris (Satoshi TAGOMORI) 3 months ago. Updated 21 days ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
ruby -v:
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin20]
[ruby-dev:51080]

Description

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
    5 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/arm64-darwin20/enc/encdb.bundle
    6 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/arm64-darwin20/enc/trans/transdb.bundle
    7 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/arm64-darwin20/rbconfig.rb
    8 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/compatibility.rb
    9 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/defaults.rb
   10 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/deprecate.rb
   11 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/errors.rb
   12 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/exceptions.rb
   13 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/basic_specification.rb
   14 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/stub_specification.rb
   15 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/text.rb
   16 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/user_interaction.rb
   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
   19 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/platform.rb
   20 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/version.rb
   21 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/requirement.rb
   22 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/specification.rb
   23 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/util.rb
   24 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/dependency.rb
   25 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_gem.rb
   26 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/arm64-darwin20/monitor.bundle
   27 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/monitor.rb
   28 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_require.rb
   29 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/core_ext/kernel_warn.rb
   30 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems.rb
   31 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/rubygems/path_support.rb
   32 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/version.rb
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   35 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/jaro_winkler.rb
   36 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/spell_checker.rb
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   40 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/spell_checkers/method_name_checker.rb
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   43 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/tree_spell_checker.rb
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   45 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean/formatters/plain_formatter.rb
   46 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/did_you_mean.rb
   47 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/arm64-darwin20/socket.bundle
   48 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/arm64-darwin20/io/wait.bundle
   49 /Users/tagomoris/.rbenv/versions/3.0.0/lib/ruby/3.0.0/socket.rb

* Process memory map:

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[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

Abort trap: 6

Files

Updated by tagomoris (Satoshi TAGOMORI) 28 days ago

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:

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
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   32 /Users/tagomoris/.rbenv/versions/3.1.0-dev/lib/ruby/3.1.0/rubygems.rb
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   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
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   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
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[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.

Abort trap: 6

Updated by tagomoris (Satoshi TAGOMORI) 21 days ago

I built Ruby from HEAD, and got the crash report again. rb_vm_lock_enter() seems to cause SEGV.
I'm wondering how I can investigate it more.

Thread 3 Crashed:
0   libsystem_kernel.dylib              0x0000000197d08e68 __pthread_kill + 8
1   libsystem_pthread.dylib             0x0000000197d3b43c pthread_kill + 292
2   libsystem_c.dylib                   0x0000000197c83454 abort + 124
3   ruby                                0x0000000102fb08e4 die + 12 (error.c:779)
4   ruby                                0x0000000102fb0ab4 rb_bug_for_fatal_signal + 464 (error.c:819)
5   ruby                                0x00000001030d34b0 sigsegv + 96 (signal.c:961)
6   libsystem_platform.dylib            0x0000000197d86c44 _sigtramp + 56
7   ruby                                0x000000010310ee74 rb_vm_lock_enter + 8 (vm_sync.h:75) [inlined]
8   ruby                                0x000000010310ee74 rb_notify_fd_close + 108 (thread.c:2612)
9   ruby                                0x0000000102fef278 io_close_fptr + 120 (io.c:5017)
10  ruby                                0x0000000102ff9d04 rb_io_close + 4 (io.c:5039) [inlined]
11  ruby                                0x0000000102ff9d04 rb_io_close_m + 52 (io.c:5066)
12  ruby                                0x00000001031636a4 vm_call_cfunc_with_frame + 232 (vm_insnhelper.c:2989)
13  ruby                                0x000000010315c908 vm_sendish + 1208
14  ruby                                0x000000010314494c vm_exec_core + 11448 (insns.def:775)
15  ruby                                0x000000010315831c rb_vm_exec + 2912
16  ruby                                0x0000000103156638 invoke_block + 192 (vm.c:1264) [inlined]
17  ruby                                0x0000000103156638 invoke_iseq_block_from_c + 324 (vm.c:1336) [inlined]
18  ruby                                0x0000000103156638 invoke_block_from_c_proc + 796 (vm.c:1436) [inlined]
19  ruby                                0x0000000103156638 vm_invoke_proc + 888 (vm.c:1466)
20  ruby                                0x0000000103116168 thread_do_start_proc + 352 (thread.c:716)
21  ruby                                0x0000000103115ab8 thread_do_start + 328 (thread.c:760) [inlined]
22  ruby                                0x0000000103115ab8 thread_start_func_2 + 1196 (thread.c:835)
23  ruby                                0x00000001031154a0 thread_start_func_1 + 272 (thread_pthread.c:1051)
24  libsystem_pthread.dylib             0x0000000197d3b878 _pthread_start + 320
25  libsystem_pthread.dylib             0x0000000197d365e0 thread_start + 8
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