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A process on a production linux server became a zombie with unknown reason. I wonder if there is a certain methodology to find out what causes it.

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  • Do you know which process (program binary) it was?
    – Jens
    Aug 21, 2015 at 22:58
  • @Jens yup, it was one of java programs running on that server. Actually the process became a zombie after I killed stuck java pid.
    – hdf
    Aug 21, 2015 at 23:18
  • Then the process Z may have exited because it could no longer communicate with the process K you killed. But the parent of Z did not expect to collect an exit status this early with wait() and thus Z became a zombie.
    – Jens
    Aug 22, 2015 at 8:21

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