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      <base href="https://bugzilla.netfilter.org/" />
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - multicast and NOTRACK segfaults"
   href="https://bugzilla.netfilter.org/show_bug.cgi?id=1491">1491</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>multicast and NOTRACK segfaults
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>conntrack-tools
          </td>
        </tr>

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

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

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

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

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

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

        <tr>
          <th>Component</th>
          <td>conntrack-daemon
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>netfilter-buglog@lists.netfilter.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>arturo@netfilter.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>I can get a reproducible segfault using this config file:

Sync {
    Mode NOTRACK {
    }
    Multicast {
        IPv4_address 225.0.0.50
        Group 3780
        IPv4_interface 10.239.43.214
        Interface wlp4s0
        SndSocketBuffer 1249280
        RcvSocketBuffer 1249280
        Checksum on
    }
    Options {
        # TCPWindowTracking On
        # ExpectationSync On
    }
}
General {
    # HashLimit 524288
    LogFile on
    Syslog on
    LockFile /var/lock/conntrackd.lock
    UNIX {
        Path /var/run/conntrackd.sock
    }
    NetlinkBufferSize 2097152
    NetlinkBufferSizeMaxGrowth 8388608
    Filter From Userspace {
        Address Ignore {
            IPv4_address 127.0.0.0/8
        }
    }
}

This is with commit 7f1fb5dad90f04caa94f4fcefd1340aeb2c2f0e3
But I detected the issue even earlier in the git history.

Valgrind report:

==62735== Process terminating with default action of signal 11 (SIGSEGV)
==62735==  Access not within mapped region at address 0x10
==62735==    at 0x11882F: cache_ct_cmp (cache-ct.c:104)
==62735==    by 0x1133C1: hashtable_find (hash.c:74)
==62735==    by 0x117E7A: cache_find (cache.c:304)
==62735==    by 0x117E7A: cache_update_force (cache.c:279)
==62735==    by 0x119D57: dump_handler (ctnl.c:266)
==62735==    by 0x119D57: dump_handler (ctnl.c:257)
==62735==    by 0x4871BBB: __callback (callback.c:62)
==62735==    by 0x4AA205B: ??? (in
/usr/lib/x86_64-linux-gnu/libnfnetlink.so.0.2.0)
==62735==    by 0x4AA2822: nfnl_process (in
/usr/lib/x86_64-linux-gnu/libnfnetlink.so.0.2.0)
==62735==    by 0x4AA2B8D: nfnl_catch (in
/usr/lib/x86_64-linux-gnu/libnfnetlink.so.0.2.0)
==62735==    by 0x4872A8F: nfct_query (api.c:1003)
==62735==    by 0x119FBF: ctnl_init (ctnl.c:456)
==62735==    by 0x113284: init (run.c:307)
==62735==    by 0x111F0D: main (main.c:366)</pre>
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