From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS4713 221.184.0.0/13 X-Spam-Status: No, score=-4.2 required=3.0 tests=AWL,BAYES_00, MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI,SPF_HELO_NONE,SPF_PASS, UNPARSEABLE_RELAY shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from neon.ruby-lang.org (neon.ruby-lang.org [221.186.184.75]) by dcvr.yhbt.net (Postfix) with ESMTP id EB80D1F8C6 for ; Tue, 31 Aug 2021 13:54:12 +0000 (UTC) Received: from neon.ruby-lang.org (localhost [IPv6:::1]) by neon.ruby-lang.org (Postfix) with ESMTP id AF8C812092F; Tue, 31 Aug 2021 22:52:46 +0900 (JST) Received: from o1678948x4.outbound-mail.sendgrid.net (o1678948x4.outbound-mail.sendgrid.net [167.89.48.4]) by neon.ruby-lang.org (Postfix) with ESMTPS id 21A6812090C for ; Tue, 31 Aug 2021 22:52:43 +0900 (JST) Received: by filterdrecv-7489454b79-xc59q with SMTP id filterdrecv-7489454b79-xc59q-1-612E347A-28 2021-08-31 13:54:02.498318421 +0000 UTC m=+1525761.697925820 Received: from herokuapp.com (unknown) by geopod-ismtpd-5-0 (SG) with ESMTP id 22JbdrzjQ5OeHAr4tbj6wg for ; Tue, 31 Aug 2021 13:54:02.317 +0000 (UTC) Date: Tue, 31 Aug 2021 13:54:02 +0000 (UTC) From: "tagomoris (Satoshi TAGOMORI)" Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Redmine-Project: ruby-master X-Redmine-Issue-Tracker: Bug X-Redmine-Issue-Id: 18024 X-Redmine-Issue-Author: tagomoris X-Redmine-Sender: tagomoris X-Mailer: Redmine X-Redmine-Host: bugs.ruby-lang.org X-Redmine-Site: Ruby Issue Tracking System X-Auto-Response-Suppress: All Auto-Submitted: auto-generated X-Redmine-MailingListIntegration-Message-Ids: 81274 X-SG-EID: =?us-ascii?Q?f07=2FJznobfmetj2dtgpMPitO2F1HBp+4Zdrq+Q0rndmMh+EFepa=2FogMN2Qy9XB?= =?us-ascii?Q?fqkHNYj2FeYFBQIJmbJ93VhD3izZ4SQI6ZoV40v?= =?us-ascii?Q?fcvmInuLkO0rXCXjjr15vzE38k2LsGMvh15h4yI?= =?us-ascii?Q?BQeR2w484w9wGPxnhY35M2KGMLWYepyDfXA3I5A?= =?us-ascii?Q?Sr1t0z1Yl8UHs+j2OGTsEeaxFZh0VE0V8xFmoip?= =?us-ascii?Q?EpblOcDZpZj1eN5ljkWqnED1Qf7HjRhUC4HoBn=2F?= =?us-ascii?Q?gfVrM3wqhAoihYr2uCdOw=3D=3D?= To: ruby-dev@ruby-lang.org X-Entity-ID: b/2+PoftWZ6GuOu3b0IycA== X-ML-Name: ruby-dev X-Mail-Count: 51101 Subject: [ruby-dev:51101] [Ruby master Bug#18024] Ractor crashes when connections are closed in multiple Ractors X-BeenThere: ruby-dev@ruby-lang.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: "Ruby developers \(Japanese\)" List-Id: "Ruby developers \(Japanese\)" List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: ruby-dev-bounces@ruby-lang.org Sender: "ruby-dev" Issue #18024 has been updated by tagomoris (Satoshi TAGOMORI). 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 ``` ---------------------------------------- Bug #18024: Ractor crashes when connections are closed in multiple Ractors https://bugs.ruby-lang.org/issues/18024#change-93507 * 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: ``` :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
' snippets/ractor_accept.rb:26:in `each' snippets/ractor_accept.rb:26:in `times' snippets/ractor_accept.rb:30:in `block (2 levels) in
' 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 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1e8000000-1f0000000 r-- 1f0000000-1f2000000 r-- 1f2000000-1f2bcc000 r-- 1f2bcc000-1f4864000 rw- 1f4864000-1f6000000 r-- 1f6000000-1f6864000 r-- 1f6864000-1fa57c000 r-- 1fa57c000-1fc000000 r-- 1fc000000-200000000 r-- 200000000-210000000 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 ``` ---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/