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Bug #14742

closed

Deadlock when autoloading different constants in the same file from multiple threads

Added by eugeneius (Eugene Kenny) over 6 years ago. Updated over 6 years ago.

Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 2.6.0dev (2018-05-08 trunk 63355) [x86_64-darwin17]
Backport:
2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
[ruby-core:86935]

Description

The following example deadlocks consistently:

# a.rb
autoload :Foo, __dir__ + "/b"
autoload :Bar, __dir__ + "/b"

t1 = Thread.new { Foo }
t2 = Thread.new { Bar }

t1.join
t2.join

# b.rb
module Foo; end
module Bar; end

$ ruby a.rb
Traceback (most recent call last):
	1: from a.rb:7:in `<main>'
a.rb:7:in `join': No live threads left. Deadlock? (fatal)
3 threads, 3 sleeps current:0x00007ffa817ae680 main thread:0x00007ffa8140bf30
* #<Thread:0x00007ffa818797f8 sleep_forever>
   rb_thread_t:0x00007ffa8140bf30 native:0x00007fff9b3fa380 int:1
   a.rb:7:in `join'
   a.rb:7:in `<main>'
* #<Thread:0x00007ffa830379a8@a.rb:4 sleep_forever>
   rb_thread_t:0x00007ffa817ace60 native:0x0000700007e7b000 int:0 mutex:0x00007ffa817ae680 cond:1
    depended by: tb_thread_id:0x00007ffa8140bf30
   /Users/eugene/.rbenv/versions/2.6.0-dev/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:59:in `require'
   /Users/eugene/.rbenv/versions/2.6.0-dev/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:59:in `require'
   a.rb:4:in `block in <main>'
* #<Thread:0x00007ffa830372c8@a.rb:5 sleep_forever>
   rb_thread_t:0x00007ffa817ae680 native:0x0000700007f7e000 int:0
   /Users/eugene/src/autoload_thread_safety_test/b.rb:1:in `<top (required)>'
   /Users/eugene/.rbenv/versions/2.6.0-dev/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:59:in `require'
   /Users/eugene/.rbenv/versions/2.6.0-dev/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:59:in `require'
   a.rb:5:in `block in <main>'
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