netfilter buglog - Jul 2018 - [Bug 1273] New: hashlimit never appears to fail to match under 4.9.x

https://bugzilla.netfilter.org/show_bug.cgi?id=1273

            Bug ID: 1273
           Summary: hashlimit never appears to fail to match under 4.9.x
           Product: netfilter/iptables
           Version: unspecified
          Hardware: x86_64
                OS: All
            Status: NEW
          Severity: major
          Priority: P5
         Component: ip_tables (kernel)
          Assignee: netfilter-buglog at lists.netfilter.org
          Reporter: bugzilla-nf20180726 at ta.grue.cc

I have the same rules under both 4.9.111 and 4.8.3. The 4.8.3 kernel works as
expected but not under 4.9.111. The rules are as follows:

4.8.3:
[825033:522252112] -A m.voip.asterisk.reg -m hashlimit --hashlimit-upto 100/min
--hashlimit-burst 70 --hashlimit-mode srcip,dstport --hashlimit-name
m.voip.sip_r_li -j ACCEPT
[366031:149053285] -A m.voip.asterisk.reg -m limit --limit 5/sec -j LOG
--log-prefix "FW: SIP.REG LIMIT IN: " --log-level 6
[49357657:18457587442] -A m.voip.asterisk.reg -j DROP

4.9.111:
[44798:20928681] -A m.voip.asterisk.reg -m hashlimit --hashlimit-upto 100/min
--hashlimit-burst 70 --hashlimit-mode srcip,dstport --hashlimit-name
m.voip.sip_r_limit -j ACCEPT
[0:0] -A m.voip.asterisk.reg -m limit --limit 5/sec -j LOG --log-prefix
"FW:
SIP.REG LIMIT IN: " --log-level 6
[0:0] -A m.voip.asterisk.reg -j DROP

Sample of the content of /proc/net/ipt_hashlimit/m.voip.sip_r_li* is as
follows:

4.8.3:
...
60 37.49.231.72:0->0.0.0.0:5060 3328 1344000 19200
59 37.49.231.70:0->0.0.0.0:5060 2048 1344000 19200
60 37.49.231.86:0->0.0.0.0:5060 17920 1344000 19200
...

4.9.111:
...
59 37.49.231.117:0->0.0.0.0:5060 5772436045824000 5772436045824000 0
44 37.49.231.72:0->0.0.0.0:5060 5772436045824000 5772436045824000 0
56 37.49.231.103:0->0.0.0.0:5060 5772436045824000 5772436045824000 0
53 37.49.231.70:0->0.0.0.0:5060 5772436045824000 5772436045824000 0
...

End result is that under 4.8.3 attacks on the sip service don't get far
whereas
under 4.9.111 they can go full throttle, completely unhindered.

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