Backport #8187: timeout doesn't interrupt assignment.

• Status: Rejected
• Assignee: -

[robertgleeson (Robert Gleeson)]

Timeout does not interrupt & raise like usual with this example code:

require 'timeout'
Timeout.timeout(0.5) do
x = " "*(2**31)
end

[robertgleeson (Robert Gleeson)]

I should have said that this code might exhaust your RAM, so don't let it run too long.

[robertgleeson (Robert Gleeson)]

For my case, this code was run in a subprocess. Instead of using Timeout in the subprocess, I use it from the parent instead, like this:

pid = fork { x = " "*(2**31) }
begin
Timeout.timeout(1) do
Process.wait pid
end
rescue Timeout::Error
Process.kill 'SIGKILL', pid
Process.wait pid
end

This solves the problem for me.

[robertgleeson (Robert Gleeson)]

Tested against:

• ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.4.2]
• ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-darwin11.4.2]

The behavior on 1.9.3 is to hang without being able to interrupt, and the behavior
on 2.0.0 appears to execute the code, stop it, and exit without raising an exception.

[robertgleeson (Robert Gleeson)]

I opened this bug on Rubinius(https://github.com/rubinius/rubinius/issues/2287) and it looks like there's no way to interrupt this code. Please close.

[kosaki (Motohiro KOSAKI)]

I couldn't reproduce.

% ruby -v test.rb
ruby 2.0.0p0 (2013-02-24 revision 39474) [x86_64-linux]
/home/kosaki/ruby/git/test.rb:3: warning: assigned but unused variable - x
/home/kosaki/ruby/git/test.rb:3:in *': failed to allocate memory (NoMemoryError) from /home/kosaki/ruby/git/test.rb:3:in block in

'
from /home/kosaki/.rbenv/versions/2.0.0-p0/lib/ruby/2.0.0/timeout.rb:65:in timeout' from /home/kosaki/ruby/git/test.rb:2:in '

[kosaki (Motohiro KOSAKI)]

• Status changed from Open to Rejected