ruby exceptions in popen class

Booting gitaly for integration tests..... ok
..........................................................................................................................................................................................................................#<Thread:0x00007f906bd73478@/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23 run> terminated with exception (report_on_exception is true):
[1mTraceback[m (most recent call last):
	1: from /private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23:in `block (2 levels) in popen'
/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23:in `read': [1mstream closed in another thread ([1;4mIOError[m[1m)
[m.........#<Thread:0x00007f906b6646f0@/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23 run> terminated with exception (report_on_exception is true):
[1mTraceback[m (most recent call last):
	1: from /private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23:in `block (2 levels) in popen'
/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23:in `read': [1mstream closed in another thread ([1;4mIOError[m[1m)
[m.#<Thread:0x00007f9068160648@/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23 run> terminated with exception (report_on_exception is true):
[1mTraceback[m (most recent call last):
	1: from /private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23:in `block (2 levels) in popen'
/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:23:in `read': [1mstream closed in another thread ([1;4mIOError[m[1m)
[m........#<Thread:0x00007f906bde5690@/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:57 run> terminated with exception (report_on_exception is true):
[1mTraceback[m (most recent call last):
	1: from /private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:57:in `block in popen_with_timeout'
/private/tmp/gitaly/ruby/lib/gitlab/git/popen.rb:57:in `read': [1mstream closed in another thread ([1;4mIOError[m[1m)
[m......................................................................................................................................................................................

We spawn a thread somewhere that reads from stderr, I think that thread needs a rescue.