Comment 45 for bug 1754584

This bug was fixed in the package zfs-linux - 0.6.5.6-0ubuntu20

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zfs-linux (0.6.5.6-0ubuntu20) xenial; urgency=medium

  * Fix mmap'd libaio read on non-prefaulted page deadlock (LP: #1754584)
    - Revert previous fix as there still is a potential for deadlock
      on the prefaulted page(s). Resolve the issue by only taking a
      reference on the page when copying it and not the page lock.
      The inode range lock protects against concurrent updates via
      zfs_read() and zfs_write().

 -- Colin Ian King <email address hidden> Wed, 28 Mar 2018 14:35:11 +0100