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Bug #4608

Ctrl-c to interrupt script causes hang and 100% cpu's core load

Added by ralovets (Roman Ralovets) over 8 years ago. Updated over 8 years ago.

Status:
Third Party's Issue
Priority:
Normal
Assignee:
-
Target version:
ruby -v:
ruby 1.9.2p180 (2011-02-18 revision 30909) [i686-linux]
Backport:
[ruby-core:35869]

Description

=begin
I have got this bug after updating Ubuntu from 10.10 to 11.04 Beta.
Using shell commands like echo anything causes hang and 100% cpu's core load, if during downloading a file you press ctrl-c to interrupt.
Without using shell commands all right, we get "CInterrupted"
In the Ubuntu 10.10 all right.
For a wonder autotest have got the same problem after updating ubuntu to 11.04 Beta: if I press ctrl-c to close autotest it hangs and loads 100% cpu's core

roma@roma-comp:~/downloader$ ruby test.rb
Getting a file .. waiting for ctrl-c

CCC

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND

13159 roma 20 0 14052 8556 2568 R 100 0.4 1:52.68 ruby test.rb


I'm waiting for such a result:

roma@roma-comp:~/downloader$ ruby test.rb
Getting a file .. waiting for ctrl-c

CInterrupted

=end


Files

test.rb (379 Bytes) test.rb ralovets (Roman Ralovets), 04/25/2011 04:08 AM

Related issues

Related to Ruby master - Bug #4777: Ruby 1.9.2-p180 ignoring INT, TERM, and QUIT until it receives CONTThird Party's Issue05/25/2011Actions

History

Updated by ralovets (Roman Ralovets) over 8 years ago

=begin
This bug has been repeated on another computer with ubuntu 11.04 (ruby 1.9.2p180).

If using ruby 1.8.7 (2010-08-16 patchlevel 302) [i686-linux] it all works well.
=end

Updated by corny (Mr Corn) over 8 years ago

=begin
I have the same problem with a freshly installed Ubuntu 11.04 and ruby 1.9.2p180.
STRG-c works in irb-shell, but not in the rails shell. Same problem with autotest. No problems with ruby 1.8.7.
=end

#3

Updated by MiiJaySung (Jason Earl) over 8 years ago

I filed a similar bug on Rail's lighthouse a few days ago too. I've found Natty in fact to be pretty bad in some areas regarding stablity, I really hope the Ubuntu team clean up the various issues soon (So anyone reading this, I suggest hold back from using Natty if you haven't installed it for a bit). I know the 2.6.38 kernel changed some scheduling bits, I'm not sure if this is what's triggering this.

http://rails.lighthouseapp.com/projects/8994/tickets/6760-very-obscure-issue-with-ctrl-c-in-console-not-workng-and-periodic-freezes

This appears to be a process management / deadlock issue I think. If you manually install a kernel from Maverick (i.e. download the kernel + headers and use dpkg -i to install) it will prevent the issue, so this is a kernel change that has triggered this.

It takes a kill -9 to stop the process, so it's must be in some deadlock

Updated by kosaki (Motohiro KOSAKI) over 8 years ago

  • Status changed from Open to Third Party's Issue

I think this is the same issue with Bug #4777.

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