[ruby-core:94633] [Ruby master Bug#15509] TCPServer#accept isn't interrupted
From:
merch-redmine@...
Date:
2019-08-28 18:32:34 UTC
List:
ruby-core #94633
Issue #15509 has been updated by jeremyevans0 (Jeremy Evans).
Status changed from Open to Closed
This problem appears fixed in 2.6.4 and 2.7.0-preview1 in my environment (OpenBSD-amd64). It still occurs in 2.5.6. If it still occurs for you in 2.6.4, please reopen.
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Bug #15509: TCPServer#accept isn't interrupted
https://bugs.ruby-lang.org/issues/15509#change-81230
* Author: larskanis (Lars Kanis)
* Status: Closed
* Priority: Normal
* Assignee:
* Target version:
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
This is another issue I noticed with [Eventbox](https://github.com/larskanis/eventbox):
This script tries to stop `TCPServer#accept` with `Thread#raise`:
```ruby
require "socket"
Thread.abort_on_exception = true
class Stop < RuntimeError
end
serv = TCPServer.new("localhost", 12345)
th = Thread.handle_interrupt(Exception => :never) do
Thread.new do
begin
Thread.handle_interrupt(Stop => :on_blocking) do
# sleep # sleep is aborted
serv.accept # but accept isn't
end
rescue Stop
end
end
end
th.raise Stop
th.join
serv.close
```
The program freezes and if stopped per CTRL-C the output looks similar to:
```sh
$ ruby -d --disable-gems no-interrupt-while-accept.rb
^CException `Interrupt' at no-interrupt-while-accept.rb:23 -
Exception `Stop' at no-interrupt-while-accept.rb:15 - Stop
Traceback (most recent call last):
1: from no-interrupt-while-accept.rb:23:in `<main>'
no-interrupt-while-accept.rb:23:in `join': Interrupt
```
The debug output shows, that the `Stop` exception is delivered after the `Interrupt` exception has been delivered to the main thread. However it should be delivered immediately, since it's a blocking operation. In contrast `sleep` is aborted as expected.
This issue is present on all older MRI versions. However it doesn't appear on JRuby-9.2.5.0.
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