title: IO Completion Listener (0x1814) Worker 0x0000000000A021A0 appears to be non-yielding on Node 0
body: <p>Ello StackOverflow,</p>
  
  <p>We have recently had a situation where our production database (MSSQL 2008 R2) server fell over and we saw this error thousands of time in the error log.</p>
  
  <p>IO Completion Listener (0x1814) Worker 0x0000000000A021A0 appears to be non-yielding on Node 0. Approx CPU Used: kernel 0 ms, user 0 ms, Interval: 20233954.</p>
  
  <p>Has anyone ever seen this before or could provide some advice to begin looking into it.</p>
  
  <p>We ran a big performance test against the instance about 24 hours before we started seeing the error.</p>
  
  <p>Kin</p>