November 2023 - ruby-dev - ml.ruby-lang.org

[ruby-dev:52063] [Ruby master Bug#11183] Cumulative error on Complex::I ** 100000000000000000000000000000000
by kyanagi (Kouhei Yanagita) 16 Nov '23

16 Nov '23

Issue #11183 has been updated by kyanagi (Kouhei Yanagita). https://github.com/ruby/ruby/pull/8931 self の偏角が45度の整数倍であるような場合に特別扱いするようにしてみました。 ``` 1i ** (10 ** 100) #=> 1+0i 1i ** (10 ** 100 + 1) #=> 0+1i (1+1i) ** (10 ** 100) # warning: in a**b, b may be too big #=> (Infinity+0.0i) (1+1i) ** (10 ** 100 + 1) # warning: in a**b, b may be too big #=> (Infinity+Infinity*i) ``` * self が 1, -1, 1i, -1i の場合 * bignum 乗であっても正しい答えを返します。 * self が実数または純虚数で絶対値が1でない場合 * 偏角が 45 度の奇数倍である場合 * 小さい数（大きい数）が0（Infinity）となりますが、その前提のもとで正しい答えを返します。絶対値が 1 で偏角が 45 度の奇数倍である複素数は、実部・虚部（1/\sqrt{2}）をFloatで正確に表現することはできないため、偏角が45度の奇数倍である複素数オブジェクトの n 乗は、絶対値が1からずれていくことになります。なお、60 度など他の角度についてですが、偏角が 45 度の整数倍を除く有理数度である複素数は、Complex では正確には表現できません。（実部または虚部のいずれかが無理数になる）従って、Complex オブジェクトの偏角は 45 度の整数倍であるか無理数であるかになるため、偏角を n 倍することで n 乗を求める計算が誤差なしでできるのは、偏角が 45 度の整数倍の場合に限られることになります。 ---------------------------------------- Bug #11183: Cumulative error on Complex::I ** 100000000000000000000000000000000 https://bugs.ruby-lang.org/issues/11183#change-105340 * Author: ko1 (Koichi Sasada) * Status: Open * Priority: Normal * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- ``` p Complex::I ** 100000000000000000000000000000000 ``` が、32bit 環境だと、 ``` ruby 2.3.0dev (2015-05-21 trunk 50502) [i386-mswin32_110] t.rb:1: warning: in a**b, b may be too big (-0.08483712490438944+1.5651333429325577e+32i) ``` こんな感じで、変な値が出ます。 ``` # ubuntu 64bit だと (0.9943722416631883-0.10594264962575697i) ``` できれば、こっちも 1+0i にぴたっとしてるといいのでしょうが。この問題に対する、うささんのコメント: > 真面目にコードを読むと、Complex#** は引数(指数)がFixnumでない場合は複素数をいったん極座標形式に変換してからrとθの双方をそれぞれ計算し、最後にf_complex_polarを使ってComplexオブジェクトにしてるのですが、θはFloatなので当然に誤差が蓄積し、という感じです。まあ、誤差が蓄積しなかったとしても、f_complex_polarの中でせっかくθが0°・90°・180°・270°のケースを特別扱いしようとしてるのにdouble値を==で比較してるのでまったく救われそうにない、という感じではありますが。 > θをn倍する計算に対して、nが整数である場合は360°は0°と同じという性質を利用して誤差を蓄積しない計算をすればだいぶマシになるとは思いますが、しかしめんどくさいっすね。 ---Files-------------------------------- my_complex.diff (2.09 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52062] [Ruby master Bug#18024] Ractor crashes when connections are closed in multiple Ractors
by tagomoris (Satoshi Tagomori) 13 Nov '23

13 Nov '23

Issue #18024 has been updated by tagomoris (Satoshi Tagomori). 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? ---------------------------------------- Bug #18024: Ractor crashes when connections are closed in multiple Ractors https://bugs.ruby-lang.org/issues/18024#change-105322 * Author: tagomoris (Satoshi Tagomori) * Status: Assigned * Priority: Normal * Assignee: ko1 (Koichi Sasada) * 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 5 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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-------------------------------- 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/

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[ruby-dev:52061] [Ruby master Bug#18024] Ractor crashes when connections are closed in multiple Ractors
by dazuma (Daniel Azuma) 13 Nov '23

13 Nov '23

Issue #18024 has been updated by dazuma (Daniel Azuma). 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. ---------------------------------------- Bug #18024: Ractor crashes when connections are closed in multiple Ractors https://bugs.ruby-lang.org/issues/18024#change-105315 * Author: tagomoris (Satoshi Tagomori) * Status: Assigned * Priority: Normal * Assignee: ko1 (Koichi Sasada) * 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 5 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15c000000-15c800000 rw- 15c800000-15d000000 rw- 15d000000-15d800000 rw- 15d800000-15e000000 rw- 15e000000-15e800000 rw- 15e800000-15f000000 rw- 15f000000-15f800000 rw- 15f800000-160000000 rw- 167b08000-16b30c000 --- 16b30c000-16bb08000 rw- 16bb08000-16bb0c000 --- 16bb0c000-16bb94000 rw- 16bb94000-16bb98000 --- 16bb98000-16bda0000 rw- 16bda0000-16bda4000 --- 16bda4000-16bfac000 rw- 16bfac000-16bfb0000 --- 16bfb0000-16c1b8000 rw- 180000000-190000000 r-- 190000000-1a0000000 r-- 1a0000000-1b0000000 r-- 1b0000000-1c0000000 r-- 1c0000000-1d0000000 r-- 1d0000000-1e0000000 r-- 1e0000000-1e6000000 r-- 1e6000000-1e6e2c000 r-- 1e6e2c000-1e8000000 rw- 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/

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[ruby-dev:52060] [Ruby master Bug#11183] Cumulative error on Complex::I ** 100000000000000000000000000000000
by JesseJohnson (Jesse Johnson) 13 Nov '23

13 Nov '23

Issue #11183 has been updated by JesseJohnson (Jesse Johnson). This behavior still exists in Ruby 3.2.2. In order to fix this Complex#** would need to handle the special cases of self being 0+1i and 0-1i. Correct: ``` irb(main):052:0> Complex(0, -1) ** 1000000000000000000 => (1+0i) irb(main):053:0> Complex(0, -1) ** 1000000000000000001 => (0-1i) irb(main):054:0> Complex(0, -1) ** 1000000000000000002 => (-1+0i) irb(main):055:0> Complex(0, -1) ** 1000000000000000003 => (0+1i) irb(main):056:0> Complex(0, -1) ** 1000000000000000004 => (1+0i) irb(main):057:0> Complex(0, 1) ** 1000000000000000000 => (1+0i) irb(main):058:0> Complex(0, 1) ** 1000000000000000001 => (0+1i) irb(main):059:0> Complex(0, 1) ** 1000000000000000002 => (-1+0i) irb(main):060:0> Complex(0, 1) ** 1000000000000000003 => (0-1i) irb(main):061:0> Complex(0, 1) ** 1000000000000000004 => (1+0i) ``` Suboptimal: ``` irb(main):066:0> Complex(0, -1) ** 10000000000000000000 (irb):66: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):067:0> Complex(0, -1) ** 10000000000000000001 (irb):67: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):068:0> Complex(0, -1) ** 10000000000000000002 (irb):68: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):069:0> Complex(0, -1) ** 10000000000000000003 (irb):69: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):070:0> Complex(0, -1) ** 10000000000000000004 (irb):70: warning: in a**b, b may be too big => (-0.9125701512929312+0.40892018655135703i) irb(main):071:0> Complex(0, 1) ** 10000000000000000000 (irb):71: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):072:0> Complex(0, 1) ** 10000000000000000001 (irb):72: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):073:0> Complex(0, 1) ** 10000000000000000002 (irb):73: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):074:0> Complex(0, 1) ** 10000000000000000003 (irb):74: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):075:0> Complex(0, 1) ** 10000000000000000004 (irb):75: warning: in a**b, b may be too big => (-0.9125701512929312-0.40892018655135703i) irb(main):076:0> in):070:0> Complex(0, -1) ** 10000000000000000004 => (-0.9125701512929312-0.40892018655135703i) ``` ---------------------------------------- Bug #11183: Cumulative error on Complex::I ** 100000000000000000000000000000000 https://bugs.ruby-lang.org/issues/11183#change-105310 * Author: ko1 (Koichi Sasada) * Status: Open * Priority: Normal * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- ``` p Complex::I ** 100000000000000000000000000000000 ``` が、32bit 環境だと、 ``` ruby 2.3.0dev (2015-05-21 trunk 50502) [i386-mswin32_110] t.rb:1: warning: in a**b, b may be too big (-0.08483712490438944+1.5651333429325577e+32i) ``` こんな感じで、変な値が出ます。 ``` # ubuntu 64bit だと (0.9943722416631883-0.10594264962575697i) ``` できれば、こっちも 1+0i にぴたっとしてるといいのでしょうが。この問題に対する、うささんのコメント: > 真面目にコードを読むと、Complex#** は引数(指数)がFixnumでない場合は複素数をいったん極座標形式に変換してからrとθの双方をそれぞれ計算し、最後にf_complex_polarを使ってComplexオブジェクトにしてるのですが、θはFloatなので当然に誤差が蓄積し、という感じです。まあ、誤差が蓄積しなかったとしても、f_complex_polarの中でせっかくθが0°・90°・180°・270°のケースを特別扱いしようとしてるのにdouble値を==で比較してるのでまったく救われそうにない、という感じではありますが。 > θをn倍する計算に対して、nが整数である場合は360°は0°と同じという性質を利用して誤差を蓄積しない計算をすればだいぶマシになるとは思いますが、しかしめんどくさいっすね。 ---Files-------------------------------- my_complex.diff (2.09 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52059] [Ruby master Bug#10436] ruby -c and ripper inconsistency: m(&nil) {}
by jemmai (Jemma Issroff) 13 Nov '23

13 Nov '23

Issue #10436 has been updated by jemmai (Jemma Issroff). This bug still exists on Ripper. Should we try revive @jeremyevans0's patch? It is potentially worth noting that Prism creates a `ParseError`: "Multiple block arguments; only one block is allowed" ---------------------------------------- Bug #10436: ruby -c and ripper inconsistency: m(&nil) {} https://bugs.ruby-lang.org/issues/10436#change-105301 * Author: akr (Akira Tanaka) * Status: Open * Priority: Normal * ruby -v: ruby 2.2.0dev (2014-10-27 trunk 48168) [x86_64-linux] * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN ---------------------------------------- m(&nil) {} というまちがったコードは ruby -c でちゃんとエラーになるのに、 Ripper.sexp ではならないようです。 ``` % cat z.rb m(&nil) {} % ruby -c z.rb z.rb:1: both block arg and actual block given % ruby -rripper -e 'p Ripper.sexp(STDIN.read)' < z.rb [:program, [[:method_add_block, [:method_add_arg, [:fcall, [:@ident, "m", [1, 0]]], [:arg_paren, [:args_add_block, [], [:var_ref, [:@kw, "nil", [1, 3]]]]]], [:brace_block, nil, [[:void_stmt]]]]]] % ruby -v ruby 2.2.0dev (2014-10-27 trunk 48168) [x86_64-linux] ``` ---Files-------------------------------- ripper-block_dup_check-10436.patch (2.2 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52058] [Ruby master Bug#8445] IO.open and IO#set_enconding does not support :fallback option
by JesseJohnson (Jesse Johnson) 13 Nov '23

13 Nov '23

Issue #8445 has been updated by JesseJohnson (Jesse Johnson). I can replicate this in 3.2.2. ---------------------------------------- Bug #8445: IO.open and IO#set_enconding does not support :fallback option https://bugs.ruby-lang.org/issues/8445#change-105299 * Author: pjmtdw (Haruhiro Yoshimoto) * Status: Assigned * Priority: Normal * Assignee: akr (Akira Tanaka) * ruby -v: trunk(ruby 2.1.0dev) ---------------------------------------- RubyDoc says that `IO.open` and `IO#set_encoding` supports optional argument defined in `String#encode`. http://ruby-doc.org/core-2.0/IO.html#method-c-new-label-Options In fact, `:invalid, :undef and :replace` works as expected. However, `:fallback` option does not work neither for `IO.open` and `IO#set_encoding`. Following is the example code which does not work. `f(x)` is never called even if hoge.txt contains non convertible character. ```ruby File.open("./hoge.txt","r:Shift_JIS:utf-8", :fallback => lambda{|x|f(x)}){|f| ... } File.open("./hoge.txt"){|f| f.set_encoding("Shift_JIS","utf-8",:fallback => lambda{|x|f(x)}) ... } ``` I Think this is because `fill_cbuf()` in `io.c` calls `rb_econv_convert()` from `transcode.c` directly. On the other hand, `fallback_func` is called in `transcode_loop()`, which is called by `str_encode()`. Since `transcode_loop()` also calls `rb_econv_convert()`, I wrote a small patch which moves some codes from `transcode_loop()` to `rb_econv_convert()` to fix the problem. The attached file is the patch. Hope this helps. ---Files-------------------------------- support-fallback-for-io.patch (3.9 KB) -- https://bugs.ruby-lang.org/

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[ruby-dev:52057] [Ruby master Bug#6351] transcode table generator does not support multi characters of Unicode
by JesseJohnson (Jesse Johnson) 13 Nov '23

13 Nov '23

Issue #6351 has been updated by JesseJohnson (Jesse Johnson). @duerst Is this still an issue? If so, is there a test case? ---------------------------------------- Bug #6351: transcode table generator does not support multi characters of Unicode https://bugs.ruby-lang.org/issues/6351#change-105291 * Author: usa (Usaku NAKAMURA) * Status: Assigned * Priority: Normal * Assignee: duerst (Martin Dürst) * ruby -v: ruby 2.0.0dev (2012-04-24 trunk 35457) * Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN ---------------------------------------- 改めてチケット起こします。[ruby-dev:45576] より。 On 2012/04/24 17:11, "Martin J. Dürst" wrote: > On 2012/04/24 17:02, U.Nakamura wrote: > >> データは例によってNetBSDのものが利用できそうです。 >> なのですが、transcodeってUnicodeの第0面(BMP)以外はサポートし >> てましたっけ? > > もちろんです :-) もうちょっと調べました。BMP 以外は transcode の最初から全く問題ないですが、現時点で引っかかるのは次のものです (http://x0213.org/codetable/euc-jis-2004-std.txt から抜粋): 0xA4F7 U+304B+309A # [2000] 0xA4F8 U+304D+309A # [2000] 0xA4F9 U+304F+309A # [2000] 0xA4FA U+3051+309A # [2000] 0xA4FB U+3053+309A # [2000] 0xA5F7 U+30AB+309A # [2000] 0xA5F8 U+30AD+309A # [2000] 0xA5F9 U+30AF+309A # [2000] 0xA5FA U+30B1+309A # [2000] 0xA5FB U+30B3+309A # [2000] 0xA5FC U+30BB+309A # [2000] 0xA5FD U+30C4+309A # [2000] 0xA5FE U+30C8+309A # [2000] 0xA6F8 U+31F7+309A # [2000] 0xABC4 U+00E6+0300 # [2000] 0xABC8 U+0254+0300 # [2000] 0xABC9 U+0254+0301 # [2000] 0xABCA U+028C+0300 # [2000] 0xABCB U+028C+0301 # [2000] 0xABCC U+0259+0300 # [2000] 0xABCD U+0259+0301 # [2000] 0xABCE U+025A+0300 # [2000] 0xABCF U+025A+0301 # [2000] 0xABE5 U+02E9+02E5 # [2000] 0xABE6 U+02E5+02E9 # [2000] ようするに、JIS X 0213 で一文字になっているが、Unicode で二文字になっているものです。EUC-JISX0213 から UTF-8 は問題ないですが、逆は現在引っかかります。windows-1258 も (逆ですが) 同じ問題がありますので、いずれはなくさないといけないと思いましたが、今回はいいきっかけのではないかと思います。よろしくお願いします。 Martin. -- https://bugs.ruby-lang.org/

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