I can provoke a very similar crash with "systemd-resolve www.facebook.com":
www.facebook.com: resolve call failed: DNSSEC validation failed: 
failed-auxiliary

Mai 31 14:00:45 donald systemd-resolved[14605]: Using degraded feature set 
(UDP) for DNS server 192.168.2.1.
Mai 31 14:00:45 donald systemd-resolved[14605]: DNSSEC validation failed for 
question c10r.facebook.com IN SOA: failed-auxiliary
Mai 31 14:00:45 donald systemd-resolved[14605]: DNSSEC validation failed for 
question star-mini.c10r.facebook.com IN DS: failed-auxiliary
Mai 31 14:00:45 donald systemd-resolved[14605]: DNSSEC validation failed for 
question star-mini.c10r.facebook.com IN SOA: failed-auxiliary
Mai 31 14:00:45 donald systemd-resolved[14605]: DNSSEC validation failed for 
question star-mini.c10r.facebook.com IN AAAA: failed-auxiliary
Mai 31 14:00:45 donald systemd-resolved[14605]: DNSSEC validation failed for 
question star-mini.c10r.facebook.com IN A: failed-auxiliary
Mai 31 14:00:45 donald systemd-resolved[14605]: *** Error in 
`/lib/systemd/systemd-resolved': double free or corruption (top): 
0x0000558e1a5feac0 ***

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https://bugs.launchpad.net/bugs/1586991

Title:
  systemd-resolved crashed with SIGSEGV in
  dns_transaction_cache_answer()

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