Bug #13632
Updated by nvashchenko (Nikolay Vashchenko) over 7 years ago
In the bugfix for https://bugs.ruby-lang.org/issues/13076 has been introduced another bug, caused by a busy waiting in rb_notify_fd_close method, while the FD is being released. During this waiting, it pumps huge amounts of the ruby_error_stream_closed errors into thread's interrupt queue, which almost all stay there unprocessed. It can be up for several hundred of exceptions in the queue, depending on circumstances.
``` ruby
a = []
t = []
10.times do
r,w = IO.pipe
a << [r,w]
t << Thread.new do
while r.gets
end rescue IOError
# Interrupt queue is full and all IO is broken
Thread.current.pending_interrupt? # Expected to be false, because it's already rescued
IO.sysopen ("/dev/tty") # Expected not to throw an error. On each such call, it dequeues the next item from interrupt queue until there's none
end
end
a.each do |r,w|
w.puts "test"
w.close
r.close
end
t.each do |th|
th.join
end
```
Output:
``` text
Traceback (most recent call last):
1: from test2.rb:9:in `block (2 levels) in <main>'
test2.rb:9:in `sysopen': stream closed in another thread (IOError)
```