From: shugo@...
Date: 2015-10-29T02:09:54+00:00
Subject: [ruby-core:71258] [Ruby trunk - Bug #11384] multi-threaded autoload	sometimes fails

Issue #11384 has been updated by Shugo Maeda.


Eric Wong wrote:
> shugo@ruby-lang.org wrote:
>  > The script causes an error within 100 times on My Ubuntu 14.04 box,
>  > but it runs over 10,000 times with your patch.
>  
>  Is my patch still running beyond 10,000 times?

It's still running beyond 49,000 times on my notebook, which sleeps at night.
I'll inform you if any error occurs.


----------------------------------------
Bug #11384: multi-threaded autoload sometimes fails
https://bugs.ruby-lang.org/issues/11384#change-54631

* Author: Eric Wong
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: trunk r51319
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
----------------------------------------
~~~
I get this failure once in a blue moon:

#8 test_autoload.rb:46:in `<top (required)>':
     open("zzz.rb", "w") {|f| f.puts "class ZZZ; def self.ok;:ok;end;end"}
     autoload :ZZZ, "./zzz.rb"
     t1 = Thread.new {ZZZ.ok}
     t2 = Thread.new {ZZZ.ok}
     [t1.value, t2.value].join
  #=> "" (expected "okok")
stderr output is not empty
   bootstraptest.tmp.rb:5:in `block in <main>': uninitialized constant ZZZ (Name
+Error)
test_autoload.rb        FAIL 1/8
FAIL 1/1010 tests failed


It is a very rare failure, I extracted it into a standalone script and
it took over 500,000 runs to hit it:

unless test(?e, "zzz.rb")
  open("zzz.rb", "w") {|f| f.puts "class ZZZ; def self.ok;:ok;end;end"}
end
autoload :ZZZ, "./zzz.rb"
t1 = Thread.new {ZZZ.ok}
t2 = Thread.new {ZZZ.ok}
[t1.value, t2.value].join
~~~

I'll work on this when I find time, but maybe somebody else can look at it
sooner.  I'm not sure if it affects older versions.




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