> https://github.com/twitter/rubyenterpriseedition187-248/commit/83fc22

> On Tue, Apr 10, 2012 at 1:02 PM, Chehai WU <wuche...@gmail.com> wrote:
> > The link works for me.

> > On Tue, Apr 10, 2012 at 2:15 PM, Nate Westheimer <
> nate.westhei...@gmail.com>
> > wrote:

> >> Hey All,

> >> That link to Twitter's GH is broken. Can anyone point me to a
> replacement
> >> for this?

> >> Thanks,
> >> Nate

> >> On Thursday, August 25, 2011 1:25:03 AM UTC-4, WU Chehai wrote:

> >>> Thanks very much! We are going to use your patch.

> >>> On Jul 29, 11:03 am, Evan Weaver <ewea...@gmail.com> wrote:
> >>> > We ran into this bug in Kiji and fixed it the following
> >>> > way:
> https://github.com/twitter/rubyenterpriseedition187-248/commit/83fc22...

> >>> > It was causing a horrible fault for us where the readfds for the curr
> >>> > thread would get nulled out; thus you wait on nothing for the full
> >>> > timeout (in Net::HTTP) in this case.

> >>> > REE also calls rb_gc_finalize_deferred() at the end of a collection,
> >>> > so I think you can apply the same patch.

> >>> > Evan

> >>> > On Tue, Jan 18, 2011 at 5:45 PM, WU Chehai <wuche...@gmail.com>
> wrote:
> >>> > > Actually, regular Ruby 1.8.7-p330 does not has this issue.

> >>> > > The regular Ruby 1.8.7 finalizes objects every time a node is
> evaled
> >>> > > if some conditions are met, so the temp file object (temp) is
> >>> > > finalized before the thread exists. Everything should be fine.

> >>> > > Therefore, this is a bug in current REE 1.8.7

> >>> > > On Jan 17, 4:34 pm, WU Chehai <wuche...@gmail.com> wrote:
> >>> > >> Hi, all

> >>> > >> The following code ends up an infinite loop

> >>> > >> require "tempfile"
> >>> > >> GC.stress = true
> >>> > >> t = Thread.new do
> >>> > >>   temp = Tempfile.new("tmp")
> >>> > >>   temp << "something"
> >>> > >>   temp = nil
> >>> > >>   h = Hash.new
> >>> > >> end
> >>> > >> t.join

> >>> > >> Our analysis shows that there is a race condition in REE 1.8.7:

> >>> > >> - When a thread finishes running, REE/Ruby dequeues it
> >>> > >> (rb_thread_remove)  from the global thread list and calls
> >>> > >> rb_thread_schedule in order to schedule another thread to run.

> >>> > >> - rb_thread_schedule invokes  rb_gc_finalize_deferred before
> >>> > >> scheduling another thread.

> >>> > >> - rb_gc_finalize calls finalizer on Ruby Tempfile object. The
> >>> > >> finalizer closes a file descriptor by calling rb_thread_fd_close

> >>> > >> - rb_thread_fd_close has a loop to iterate over all threads.

> >>> > >> - However, the current thread is already dequeued (it points to
> >>> > >> other
> >>> > >> threads, but no threads point back to it), so the loop is actually
> >>> > >> an
> >>> > >> infinite loop.

> >>> > >> We believe this issue also exists in regular Ruby 1.8.7, but we
> >>> > >> cannot
> >>> > >> reproduce it. Is this a bug in REE 1.8.7?

> >>> > >> Thanks

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