[#108552] [Ruby master Bug#18782] Race conditions in autoload when loading the same feature with multiple threads. — "ioquatix (Samuel Williams)" <noreply@...>
Issue #18782 has been reported by ioquatix (Samuel Williams).
11 messages
2022/05/14
[ruby-core:108559] [Ruby master Bug#15790] Strange interaction between autoload and $LOADED_FEATURES
From:
"ioquatix (Samuel Williams)" <noreply@...>
Date:
2022-05-15 13:34:18 UTC
List:
ruby-core #108559
Issue #15790 has been updated by ioquatix (Samuel Williams).
Let me add, that I think it's also reasonable sequence of events/state transition:
```
before failed autoload autoload path is "/Users/fxn/tmp/x.rb"
after failed autoload autoload path is "/Users/fxn/tmp/x.rb"
after $LOADED_FEATURES deletion autoload path is "/Users/fxn/tmp/x.rb"
```
----------------------------------------
Bug #15790: Strange interaction between autoload and $LOADED_FEATURES
https://bugs.ruby-lang.org/issues/15790#change-97598
* Author: fxn (Xavier Noria)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
If an autoload fails and we remove its associated file from `$LOADED_FEATURES`, the autoload is back:
```
$ cat x.rb
Y = 1 # should be X, emulates a typo
$ cat test.rb
def au
Object.autoload?(:X).inspect
end
x_rb = File.realpath("x.rb")
autoload :X, x_rb
puts "before failed autoload autoload path is #{au}"
X rescue nil
puts "after failed autoload autoload path is #{au}"
$LOADED_FEATURES.delete(x_rb)
puts "after $LOADED_FEATURES deletion autoload path is #{au}"
```
The output is
```
$ ruby -v test.rb
ruby 2.6.1p33 (2019-01-30 revision 66950) [x86_64-darwin18]
before failed autoload autoload path is "/Users/fxn/tmp/x.rb"
after failed autoload autoload path is nil
after $LOADED_FEATURES deletion autoload path is "/Users/fxn/tmp/x.rb"
```
See? Last line would be expected to print a `nil` autoload path.
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