imap connections hang forever on sun.nio.ch.EPollArrayWrapper.epollWait

I have a jruby rest service which retrieves email from different imap accounts using ruby imap. After being up for a few hours, all of the worker threads become stuck within get_tagged_response on "@response_arrival.wait"

def get_tagged_response(tag)
until @tagged_responses.key?(tag)
@response_arrival.wait
end
return pick_up_tagged_response(tag)
end

They seem to be waiting on their @receiver_thread which is retrieving data from the imap server. When i do a thread dump, half of the threads are stuck here:

"Thread-9802" daemon prio=10 tid=0x0000000003e71000 nid=0x5e78 runnable [0x00007f3f6e9c6000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:228)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:83)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)

• locked <0x00007f3ff95fbe48> (a sun.nio.ch.Util$1)
• locked <0x00007f3ff95fbe30> (a java.util.Collections$UnmodifiableSet)
• locked <0x00007f3ff95fba70> (a sun.nio.ch.EPollSelectorImpl)
  at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
  at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:102)
  at org.jruby.ext.openssl.SSLSocket.waitSelect(SSLSocket.java:240)
  at org.jruby.ext.openssl.SSLSocket.sysread(SSLSocket.java:448)
  at org.jruby.ext.openssl.SSLSocket$i_method_0_1$RUBYINVOKER$sysread.call(org/jruby/ext/openssl/SSLSocket$i_method_0_1$RUBYINVOKER$sysread.gen:65535)
  at org.jruby.internal.runtime.methods.JavaMethod$JavaMethodN.call(JavaMethod.java:630)
  at org.jruby.internal.runtime.methods.DynamicMethod.call(DynamicMethod.java:186)
  at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:146)
  at ruby.jit.fill_rbuff_0CEA65EC1C909A5CF6CB7E8100C08A3F334C6007.rescue_1$RUBY$_rescue__0(buffering.rb:35)
  at ruby.jit.fill_rbuff_0CEA65EC1C909A5CF6CB7E8100C08A3F334C6007._file_(buffering.rb:34)
  at ruby.jit.fill_rbuff_0CEA65EC1C909A5CF6CB7E8100C08A3F334C6007._file_(buffering.rb)
  at org.jruby.internal.runtime.methods.JittedMethod.call(JittedMethod.java:119)
  at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:106)
  at ruby.jit.gets_78EF17A1CC25A7841D76040F4F007ECC23A22E41._file_(buffering.rb:106)
  at ruby.jit.gets_78EF17A1CC25A7841D76040F4F007ECC23A22E41._file_(buffering.rb)
  at org.jruby.ast.executable.AbstractScript._file_(AbstractScript.java:39)
  at org.jruby.internal.runtime.methods.JittedMethod.call(JittedMethod.java:153)
  at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:309)
  at org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:148)
  at ruby.jit.get_response_9C1FCDC0EA0182083B570911F4E3FECA09F08611._file_(imap.rb:994)
  at ruby.jit.get_response_9C1FCDC0EA0182083B570911F4E3FECA09F08611._file_(imap.rb)
  at org.jruby.internal.runtime.methods.JittedMethod.call(JittedMethod.java:119)
  at org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:289)

Could this be a problem with nio or open_ssl? I am using jruby-openssl (0.7.2.dev).

I originally submitted a ticket with the ruby developers but they referred me to jruby .

http://redmine.ruby-lang.org/issues/show/3999

thx.