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Bug #18024
closed
Ractor crashes when connections are closed in multiple Ractors
Bug #18024: Ractor crashes when connections are closed in multiple Ractors
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 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250000000-260000000 r-- 260000000-270000000 r-- 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
Updated by tagomoris (Satoshi Tagomori) about 4 years ago
- File ruby_2021-08-24-203317_Moris-Macbook-Air.crash 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:
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 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16cecc000-16ced0000 --- 16ced0000-16cf58000 rw- 16cf58000-16cf5c000 --- 16cf5c000-16d164000 rw- 16d164000-16d168000 --- 16d168000-16d370000 rw- 16d370000-16d374000 --- 16d374000-16d57c000 rw- 180000000-190000000 r-- 190000000-1a0000000 r-- 1a0000000-1b0000000 r-- 1b0000000-1c0000000 r-- 1c0000000-1d0000000 r-- 1d0000000-1e0000000 r-- 1e0000000-1f0000000 r-- 1f0000000-1f6000000 r-- 1f6000000-1f6d64000 r-- 1f6d64000-1f8000000 rw- 1f8000000-200000000 r-- 200000000-202000000 r-- 202000000-202b14000 r-- 202b14000-2047b0000 rw- 2047b0000-206000000 r-- 206000000-2067b0000 r-- 2067b0000-20a4d0000 r-- 20a4d0000-20c000000 r-- 20c000000-210000000 r-- 210000000-220000000 r-- 220000000-230000000 r-- 230000000-240000000 r-- 240000000-250000000 r-- 250000000-260000000 r-- 260000000-270000000 r-- 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 Updated by tagomoris (Satoshi Tagomori) about 4 years 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 
Updated by hsbt (Hiroshi SHIBATA) almost 4 years ago
- Status changed from Open to Assigned
- Assignee set to ko1 (Koichi Sasada)
Updated by ko1 (Koichi Sasada) almost 4 years ago
I couldn't repro it on WSL.
now only on MacOS?
Updated by niku (niku _) almost 3 years ago
I also couldn't reproduce it on m2 mac with both ruby versions 3.0.0 which is reported and 3.2.0 the latest.
I hope it helps.
~/src/confirm_bugs.ruby-lang.org/18024 () asdf local ruby 3.0.0 ~/src/confirm_bugs.ruby-lang.org/18024 () ruby --version ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [arm64-darwin22] ~/src/confirm_bugs.ruby-lang.org/18024 () ruby description.rb <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|0 Data: yay" "Worker|0 Data: yay" "Worker|0 Data: yay" "Worker|1 Data: yay" "Worker|1 Data: yay" "Worker|1 Data: yay" "Worker|0 Data: yay" "Worker|0 Data: yay" "Worker|1 Data: yay" "Worker|0 Data: yay" ^C<internal:ractor>:694:in `take': Interrupt from description.rb:35:in `block in <main>' from description.rb:35:in `each' from description.rb:35:in `<main>' ~/src/confirm_bugs.ruby-lang.org/18024 () asdf local ruby 3.2.0 ~/src/confirm_bugs.ruby-lang.org/18024 () ruby --version ruby 3.2.0 (2022-12-25 revision a528908271) [arm64-darwin22] ~/src/confirm_bugs.ruby-lang.org/18024 () ruby description.rb description.rb:9: warning: Ractor is experimental, and the behavior may change in future versions of Ruby! Also there are many implementation issues. "Starting a sender" "Worker|0 Data: yay" "Worker|0 Data: yay" "Worker|0 Data: yay" "Worker|0 Data: yay" "Worker|0 Data: yay" "Worker|1 Data: yay" "Worker|0 Data: yay" "Worker|1 Data: yay" "Worker|1 Data: yay" "Worker|0 Data: yay" ^C<internal:ractor>:698:in `take': Interrupt from description.rb:35:in `block in <main>' from description.rb:35:in `each' from description.rb:35:in `<main>' 
Updated by dazuma (Daniel Azuma) about 2 years ago
Also not able to reproduce on ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-darwin22] or ruby 3.3.0dev (2023-11-13T21:00:10Z master e8ab3f7010) [x86_64-darwin23]. I wonder if this was an environment issue in the original report.
Updated by tagomoris (Satoshi Tagomori) about 2 years ago
I retried this script on my laptop (macOS Ventura) and Ruby 3.2.2, and I also couldn't reproduce the crash.
So the problem could be an environment-specific one.
Could someone close this?
Updated by hsbt (Hiroshi SHIBATA) about 2 years ago
- Status changed from Assigned to Closed
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