Comment 29 for bug 2026757

Took some effort, but I've managed to capture a core dump

root@np0036907443:/opt/stack/dnsmasq# coredumpctl info 328293
           PID: 328293 (dnsmasq)
           UID: 65534 (nobody)
           GID: 30 (dip)
        Signal: 6 (ABRT)
     Timestamp: Fri 2024-03-01 16:19:37 UTC (2min 34s ago)
  Command Line: dnsmasq --no-hosts "" --pid-file=/opt/stack/data/neutron/dhcp/77cabae0-26bf-4374-997a-781947f2e5b2/pid --dhcp-hostsfile=/opt/stack/data/neutron/dhcp/77cabae0-26bf-4374-997a-781947f2e5b2/host --a>
    Executable: /usr/sbin/dnsmasq
 Control Group: /user.slice/user-0.slice/session-54.scope
          Unit: session-54.scope
         Slice: user-0.slice
       Session: 54
     Owner UID: 0 (root)
       Boot ID: 9aed02ce9d8a44b9845ff26acd24ad62
    Machine ID: 312834901b204815afc5cf70e422129b
      Hostname: dnsmasq
       Storage: /var/lib/systemd/coredump/core.dnsmasq.65534.9aed02ce9d8a44b9845ff26acd24ad62.328293.1709309977000000.zst (present)
     Disk Size: 29.7K
       Message: Process 328293 (dnsmasq) of user 65534 dumped core.

                Found module linux-vdso.so.1 with build-id: 975d8292a19f8c241322ae7eb151b63f4f01d8e2
                Found module ld-linux-x86-64.so.2 with build-id: 15921ea631d9f36502d20459c43e5c85b7d6ab76
                Found module libc.so.6 with build-id: c289da5071a3399de893d2af81d6a30c62646e1e
                Found module dnsmasq with build-id: d8802051e6d28c6d5d2b5ac326a392c5d5a05f5b
                Stack trace of thread 328293:
                #0 0x00007fda047499fc pthread_kill (libc.so.6 + 0x969fc)
                #1 0x00007fda046f5476 raise (libc.so.6 + 0x42476)
                #2 0x00007fda046db7f3 abort (libc.so.6 + 0x287f3)
                #3 0x00007fda0473c676 n/a (libc.so.6 + 0x89676)
                #4 0x00007fda04753cfc n/a (libc.so.6 + 0xa0cfc)
                #5 0x00007fda04755a44 n/a (libc.so.6 + 0xa2a44)
                #6 0x00007fda04758453 free (libc.so.6 + 0xa5453)
                #7 0x0000563328e86068 dhcp_config_free (dnsmasq + 0x14068)
                #8 0x0000563328e8f5e1 reread_dhcp (dnsmasq + 0x1d5e1)
                #9 0x0000563328e9864f clear_cache_and_reload (dnsmasq + 0x2664f)
                #10 0x0000563328e7b8f6 main (dnsmasq + 0x98f6)
                #11 0x00007fda046dcd90 n/a (libc.so.6 + 0x29d90)
                #12 0x00007fda046dce40 __libc_start_main (libc.so.6 + 0x29e40)
                #13 0x0000563328e7c1b5 _start (dnsmasq + 0xa1b5)