Bug#914429: flush a map does not delete the reference "device or resource busy", delete of all elements in a map does delete the reference to a chain.

[Eike Lohmann <eike.lohmann@mdex.de>]

Hi Arturo,

This problem happens only if we flush the J_TestMap!
If we delete the elements of  J_TestMap, we can delete the chain C_TestChain!

I think it's very simmilar to bug 914706.


 table ip filter {
    chain FORWARD {
        type filter hook forward priority 0; policy accept;
        jump vpn_master
    }

    map J_TestMap {
        type ipv4_addr : verdict
        flags interval
        elements = { 172.21.138.0/29 : jump C_TestChain }
    }

    chain vpn_master {
        ip saddr vmap @J_TestMap
    }

    chain C_TestChain {
    }
}

root@xmachine1:/home/user/testcase# nft flush map filter J_TestMap
root@xmachine1:/home/user/testcase# nft flush chain filter C_TestChain
root@xmachine1:/home/user/testcase# nft delete chain filter C_TestChain
Error: Could not process rule: Device or resource busy
delete chain filter C_TestChain
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

root@xmachine1:/home/user/testcase# nft list ruleset
table ip filter {
    map J_TestMap {
        type ipv4_addr : verdict
        flags interval
    }

    chain FORWARD {
        type filter hook forward priority 0; policy accept;
        jump vpn_master
    }

    chain vpn_master {
        ip saddr vmap @J_TestMap
    }

    chain C_TestChain {
    }
}