wudisheng commented on issue #1860:
URL: 
https://github.com/apache/incubator-brpc/issues/1860#issuecomment-1196294572

   Some further investigation shows that there might be another scenario --- 
readv() returned `-1` with a non-zero `errno`, but `errno` got changed to `0` 
in `return_cached_blocks()`.
   
   Another piece of debugging log supports this scenario.


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