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      <base href="https://bugzilla.netfilter.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - flush set not working: "Could not process rule: Invalid argument""
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1329">1329</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>flush set not working: "Could not process rule: Invalid argument"
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>nftables
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86_64
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Debian GNU/Linux
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>major
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P5
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>nft
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>pablo@netfilter.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>email@cs-ware.de
          </td>
        </tr></table>
      <p>
        <div>
        <pre># nft -i
nft> add table inet filter
nft> add set inet filter someset { type ipv4_addr; }
nft> add element inet filter someset { 1.1.1.1 }
nft> list ruleset
table inet filter {
        set someset {
                type ipv4_addr
                elements = { 1.1.1.1 }
        }
}
nft> flush set inet filter someset 
Error: Could not process rule: Invalid argument
flush set inet filter someset 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

# nft --version
nftables v0.7 (Scrooge McDuck)

and also verified with

# nft --version
nftables v0.9.0 (Fearless Fosdick)

# cat /proc/version
Linux version 4.9.0-8-amd64 (<a href="mailto:debian-kernel@lists.debian.org">debian-kernel@lists.debian.org</a>) (gcc version 6.3.0
20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.144-3 (2019-02-02)</pre>
        </div>
      </p>
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