[#48745] [ruby-trunk - Bug #7267][Open] Dir.glob on Mac OS X returns unexpected string encodings for unicode file names — "kennygrant (Kenny Grant)" <kennygrant@...>

17 messages 2012/11/02

[#48773] [ruby-trunk - Bug #7269][Open] Refinement doesn't work if using locate after method — "ko1 (Koichi Sasada)" <redmine@...>

12 messages 2012/11/03

[#48847] [ruby-trunk - Bug #7274][Open] UnboundMethods should be bindable to any object that is_a?(owner of the UnboundMethod) — "rits (First Last)" <redmine@...>

21 messages 2012/11/04

[#48854] [ruby-trunk - Bug #7276][Open] TestFile#test_utime failure — "jonforums (Jon Forums)" <redmine@...>

14 messages 2012/11/04

[#48988] [ruby-trunk - Feature #7292][Open] Enumerable#to_h — "marcandre (Marc-Andre Lafortune)" <ruby-core@...>

40 messages 2012/11/06

[#48997] [ruby-trunk - Feature #7297][Open] map_to alias for each_with_object — "nathan.f77 (Nathan Broadbent)" <nathan.f77@...>

19 messages 2012/11/06

[#49001] [ruby-trunk - Bug #7298][Open] Behavior of Enumerator.new different between 1.9.3 and 2.0.0 — "ayumin (Ayumu AIZAWA)" <ayumu.aizawa@...>

12 messages 2012/11/06

[#49018] [ruby-trunk - Feature #7299][Open] Ruby should not completely ignore blocks. — "marcandre (Marc-Andre Lafortune)" <ruby-core@...>

13 messages 2012/11/07

[#49044] [ruby-trunk - Bug #7304][Open] Random test failures around test_autoclose_true_closed_by_finalizer — "luislavena (Luis Lavena)" <luislavena@...>

11 messages 2012/11/07

[#49196] [ruby-trunk - Feature #7322][Open] Add a new operator name #>< for bit-wise "exclusive or" — "alexeymuranov (Alexey Muranov)" <redmine@...>

18 messages 2012/11/10

[#49211] [ruby-trunk - Feature #7328][Open] Move ** operator precedence under unary + and - — "boris_stitnicky (Boris Stitnicky)" <boris@...>

20 messages 2012/11/11

[#49229] [ruby-trunk - Bug #7331][Open] Set the precedence of unary `-` equal to the precedence `-`, same for `+` — "alexeymuranov (Alexey Muranov)" <redmine@...>

17 messages 2012/11/11

[#49256] [ruby-trunk - Feature #7336][Open] Flexiable OPerator Precedence — "trans (Thomas Sawyer)" <transfire@...>

18 messages 2012/11/12

[#49354] review open pull requests on github — Zachary Scott <zachary@...>

Could we get a review on any open pull requests on github before the

12 messages 2012/11/15
[#49355] Re: review open pull requests on github — "NARUSE, Yui" <naruse@...> 2012/11/15

2012/11/15 Zachary Scott <[email protected]>:

[#49356] Re: review open pull requests on github — Zachary Scott <zachary@...> 2012/11/15

Ok, I was hoping one of the maintainers might want to.

[#49451] [ruby-trunk - Bug #7374][Open] File.expand_path resolving to first file/dir instead of absolute path — mdube@... (Martin Dubé) <mdube@...>

12 messages 2012/11/16

[#49463] [ruby-trunk - Feature #7375][Open] embedding libyaml in psych for Ruby 2.0 — "tenderlovemaking (Aaron Patterson)" <aaron@...>

21 messages 2012/11/16
[#49494] [ruby-trunk - Feature #7375] embedding libyaml in psych for Ruby 2.0 — "vo.x (Vit Ondruch)" <v.ondruch@...> 2012/11/17

[#49467] [ruby-trunk - Feature #7377][Open] #indetical? as an alias for #equal? — "aef (Alexander E. Fischer)" <aef@...>

13 messages 2012/11/17

[#49558] [ruby-trunk - Bug #7395][Open] Negative numbers can't be primes by definition — "zzak (Zachary Scott)" <zachary@...>

10 messages 2012/11/19

[#49566] [ruby-trunk - Feature #7400][Open] Incorporate OpenSSL tests from JRuby. — "zzak (Zachary Scott)" <zachary@...>

11 messages 2012/11/19

[#49770] [ruby-trunk - Feature #7414][Open] Now that const_get supports "Foo::Bar" syntax, so should const_defined?. — "robertgleeson (Robert Gleeson)" <rob@...>

9 messages 2012/11/20

[#49950] [ruby-trunk - Feature #7427][Assigned] Update Rubygems — "mame (Yusuke Endoh)" <mame@...>

17 messages 2012/11/24

[#50043] [ruby-trunk - Bug #7429][Open] Provide options for core collections to customize behavior — "headius (Charles Nutter)" <headius@...>

10 messages 2012/11/24

[#50092] [ruby-trunk - Feature #7434][Open] Allow caller_locations and backtrace_locations to receive negative params — "sam.saffron (Sam Saffron)" <sam.saffron@...>

21 messages 2012/11/25

[#50094] [ruby-trunk - Bug #7436][Open] Allow for a "granularity" flag for backtrace_locations — "sam.saffron (Sam Saffron)" <sam.saffron@...>

11 messages 2012/11/25

[#50207] [ruby-trunk - Bug #7445][Open] strptime('%s %z') doesn't work — "felipec (Felipe Contreras)" <felipe.contreras@...>

19 messages 2012/11/27

[#50424] [ruby-trunk - Bug #7485][Open] ruby cannot build on mingw32 due to missing __sync_val_compare_and_swap — "drbrain (Eric Hodel)" <[email protected]>

15 messages 2012/11/30

[#50429] [ruby-trunk - Feature #7487][Open] Cutting through the issues with Refinements — "trans (Thomas Sawyer)" <transfire@...>

13 messages 2012/11/30

[ruby-core:48749] [ruby-trunk - Bug #6358][Closed] arm-linux : sleep() time dependent threading bug

From: "mame (Yusuke Endoh)" <mame@...>
Date: 2012-11-02 11:02:35 UTC
List: ruby-core #48749
Issue #6358 has been updated by mame (Yusuke Endoh).

Status changed from Feedback to Closed


----------------------------------------
Bug #6358: arm-linux : sleep() time dependent threading bug
https://bugs.ruby-lang.org/issues/6358#change-32228

Author: stevegoobermanhill (stephen gooberman-hill)
Status: Closed
Priority: Normal
Assignee: 
Category: 
Target version: 
ruby -v: ruby 1.9.2p136 (2010-12-25 revision 30365) [arm-linux]


Hi,
I have a multi-threading bug on a low-speed (180MHz) arm-linux platform. The bug can be consistantly produced or removed by varying the length of a sleep() interval at the end of a piece of code invoked in a Thread (the GServer#serve(io) method)

I am unable to completely isolate the bug, and the trace I get off it is intermittent, but when it occurs it terminates the program instantly. The debugging info that I get when the program fails is dependent on the sleep timer.

I have once seen a ruby fault, with a control frame backtrace (3 levels) showing a cfp consistancy fault (sorry - not sure which one, but send I think - my fault for losing the trace). However, I can consistently get a trace claiming a ThreadError
   
The lines referenced are marked in the code.

OK - the following  piece of code (log statements removed) is taken from a class derived from GServer, and implements the #serve method. The line marked with the arrow (==>) at the bottom is critical in controlling the appearance of the bug.

The bug can be made to appear by running a sequence of unit tests to stress this piece of code (there are 5 test methods in the sequence)

 - If the sleep length is 0.01, the program (a test suite) will crash on the first test, with no backtrace or debugging info

 - If the sleep length is 0.1, or if the sleep length is 0.01 AND ruby is invoked with --debug then the program will crash at a variable point  
   in the test sequence, giving the following trace
      Exception `ThreadError' at /mnt/nand-user/trident_v1.1_alpha/lib/rmodbus/tcp_multi_server.rb:88 - must be called with a block
      must be called with a block
      Exception `ThreadError' at /mnt/nand-user/trident_v1.1_alpha/lib/rmodbus/tcp_multi_server.rb:118 - must be called with a block
      /mnt/nand-user/trident_v1.1_alpha/lib/rmodbus/tcp_multi_server.rb:88:in `initialize'
      /mnt/nand-user/trident_v1.1_alpha/lib/rmodbus/tcp_multi_server.rb:88:in `eof'
      /mnt/nand-user/trident_v1.1_alpha/lib/rmodbus/tcp_multi_server.rb:88:in `serve'
   This sleep length has also (once) given some control frame information.

 - If the sleep length is 0.5, the test sequence will always run correctly.

I suspect that the issue is somewhere deep in the Thread handling code - possibly the ruby interpreter is not giving the underlying linux system enough time to clear up and reallocate threads; this results in the crash.

Hope this is of some help. I do have a workaround at this point (lengthen the timer to 0.5s), but this may be an issue on slower platforms.

Kind regards

Steve

====================== simplified code (/mnt/nand-user/trident_v1.1_alpha/lib/rmodbus/tcp_multi_server.rb:88) ===================
====================== lines referred to in error are commented                                               ===================
====================== sleep statement which can trigger or remove the bug marked with ==>                    ===================

class TCPMultiServer < GServer
   def serve(io)
      begin
        io.sync=true
        io.fcntl(Fcntl::F_SETFL, io.fcntl(Fcntl::F_GETFL) | Fcntl::O_NONBLOCK)

        while not stopped? 
          req=nil
          unless io.eof                                                           #line 88 (referenced in ThreadError)
            req = io.read(7) 
                      
            destination=req.getbyte(6)
            multicast= ( destination == 0 ) #true if multicast message
            
            active_devices= multicast ? @devices.values : [@devices[destination]]
            active_devices.compact!
            
            tr = req[0,2]
            len = req[4,2].unpack('n')[0]
            req = io.read(len - 1) unless io.eof
            
            active_devices.each do |device|    
              pdu = device.serve(req)
    
              resp = tr + "\0\0" + (pdu.size + 1).to_word + device.uid.chr + pdu
              io.write resp
            end
          end
==>       sleep(0.01)
        end
      rescue Exception => ex 
        STDERR.puts ex
        raise ex                                                                  #line 118 (referenced in ThreadError)
      end
   end
end 



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