Description of problem: I had just gone to https://qa.fedoraproject.org/blockerbugs/ which loaded, and I tried to authenticate which failed with a 502, and then all subsequent attempts to load the blocker bugs app failed. So I restarted resolved and then the page loaded OK. I got the idea to be quick on the trigger for resolved due to matanzaro's comment at https://bugzilla.redhat.com/show_bug.cgi?id=2006393#c34 Version-Release number of selected component (if applicable): systemd-250.3-3.fc36.x86_64 How reproducible: transient, seems related to TTL expiration Steps to Reproduce: no reproducer, just spontaneously happened on its own Actual results: spurious name resolution failures Feb 14 19:40:23 fedora systemd-resolved[795]: Freeing transaction 48123. Feb 14 19:44:17 fedora systemd-resolved[795]: varlink: New incoming connection. Feb 14 19:44:17 fedora systemd-resolved[795]: varlink: Connections of user 993: 0 (of 576 max) Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Setting state idle-server Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: New incoming message: {"method":"io.systemd.Resolve.ResolveHostname","parameters":{"name":"location.services.mozilla.com","flags":0}} Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Changing state idle-server → processing-method Feb 14 19:44:17 fedora systemd-resolved[795]: idn2_lookup_u8: location.services.mozilla.com → location.services.mozilla.com Feb 14 19:44:17 fedora systemd-resolved[795]: Looking up RR for location.services.mozilla.com IN A. Feb 14 19:44:17 fedora systemd-resolved[795]: Looking up RR for location.services.mozilla.com IN AAAA. Feb 14 19:44:17 fedora systemd-resolved[795]: Removing cache entry for prod.detectportal.prod.cloudops.mozgcp.net IN AAAA (expired 222s ago) Feb 14 19:44:17 fedora systemd-resolved[795]: Removing cache entry for fedoraproject.org IN A (expired 206s ago) Feb 14 19:44:17 fedora systemd-resolved[795]: Removing cache entry for fedoraproject.org IN AAAA (expired 175s ago) Feb 14 19:44:17 fedora systemd-resolved[795]: Removing cache entry for prod.detectportal.prod.cloudops.mozgcp.net IN A (expired 158s ago) Feb 14 19:44:17 fedora systemd-resolved[795]: Removing cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN AAAA (expired 124s ago) Feb 14 19:44:17 fedora systemd-resolved[795]: Cache miss for location.services.mozilla.com IN A Feb 14 19:44:17 fedora systemd-resolved[795]: Firing regular transaction 25345 for <location.services.mozilla.com IN A> scope dns on wlp0s20f3/* (validate=yes). Feb 14 19:44:17 fedora systemd-resolved[795]: Using feature level UDP+EDNS0 for transaction 25345. Feb 14 19:44:17 fedora systemd-resolved[795]: Using DNS server 75.75.75.75 for transaction 25345. Feb 14 19:44:17 fedora systemd-resolved[795]: Announcing packet size 1472 in egress EDNS(0) packet. Feb 14 19:44:17 fedora systemd-resolved[795]: Emitting UDP, link MTU is 1500, socket MTU is 0, minimal MTU is 40 Feb 14 19:44:17 fedora systemd-resolved[795]: Sending query packet with id 25345 of size 58. Feb 14 19:44:17 fedora systemd-resolved[795]: Cache miss for location.services.mozilla.com IN AAAA Feb 14 19:44:17 fedora systemd-resolved[795]: Firing regular transaction 11345 for <location.services.mozilla.com IN AAAA> scope dns on wlp0s20f3/* (validate=yes). Feb 14 19:44:17 fedora systemd-resolved[795]: Using feature level UDP+EDNS0 for transaction 11345. Feb 14 19:44:17 fedora systemd-resolved[795]: Using DNS server 75.75.75.75 for transaction 11345. Feb 14 19:44:17 fedora systemd-resolved[795]: Announcing packet size 1472 in egress EDNS(0) packet. Feb 14 19:44:17 fedora systemd-resolved[795]: Emitting UDP, link MTU is 1500, socket MTU is 0, minimal MTU is 40 Feb 14 19:44:17 fedora systemd-resolved[795]: Sending query packet with id 11345 of size 58. Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Changing state processing-method → pending-method Feb 14 19:44:17 fedora systemd-resolved[795]: Received dns UDP packet of size 206, ifindex=3, ttl=0, fragsize=0, sender=75.75.75.75, destination=10.0.0.85 Feb 14 19:44:17 fedora systemd-resolved[795]: Processing incoming packet of size 206 on transaction 25345 (rcode=SUCCESS). Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for location.services.mozilla.com IN CNAME 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN A 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN A 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN A 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN A 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN A 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN A 45s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Regular transaction 25345 for <location.services.mozilla.com IN A> on scope dns on wlp0s20f3/* now complete with <success> from network (unsigned; non-confidential). Feb 14 19:44:17 fedora systemd-resolved[795]: Received dns UDP packet of size 192, ifindex=3, ttl=0, fragsize=0, sender=75.75.75.75, destination=10.0.0.85 Feb 14 19:44:17 fedora systemd-resolved[795]: Processing incoming packet of size 192 on transaction 11345 (rcode=SUCCESS). Feb 14 19:44:17 fedora systemd-resolved[795]: Added positive unauthenticated non-confidential cache entry for location.services.mozilla.com IN CNAME 130s on wlp0s20f3/INET/75.75.75.75 Feb 14 19:44:17 fedora systemd-resolved[795]: Regular transaction 11345 for <location.services.mozilla.com IN AAAA> on scope dns on wlp0s20f3/* now complete with <success> from network (unsigned; non-confidential). Feb 14 19:44:17 fedora systemd-resolved[795]: Freeing transaction 25345. Feb 14 19:44:17 fedora systemd-resolved[795]: Following CNAME/DNAME location.services.mozilla.com → locprod2-elb-us-west-2.prod.mozaws.net. Feb 14 19:44:17 fedora systemd-resolved[795]: Positive cache hit for locprod2-elb-us-west-2.prod.mozaws.net IN A Feb 14 19:44:17 fedora systemd-resolved[795]: Regular transaction 25067 for <locprod2-elb-us-west-2.prod.mozaws.net IN A> on scope dns on wlp0s20f3/* now complete with <success> from cache (unsigned; non-confidential). Feb 14 19:44:17 fedora systemd-resolved[795]: Cache miss for locprod2-elb-us-west-2.prod.mozaws.net IN AAAA Feb 14 19:44:17 fedora systemd-resolved[795]: Firing regular transaction 62536 for <locprod2-elb-us-west-2.prod.mozaws.net IN AAAA> scope dns on wlp0s20f3/* (validate=yes). Feb 14 19:44:17 fedora systemd-resolved[795]: Using feature level UDP+EDNS0 for transaction 62536. Feb 14 19:44:17 fedora systemd-resolved[795]: Using DNS server 75.75.75.75 for transaction 62536. Feb 14 19:44:17 fedora systemd-resolved[795]: Announcing packet size 1472 in egress EDNS(0) packet. Feb 14 19:44:17 fedora systemd-resolved[795]: Emitting UDP, link MTU is 1500, socket MTU is 0, minimal MTU is 40 Feb 14 19:44:17 fedora systemd-resolved[795]: Sending query packet with id 62536 of size 67. Feb 14 19:44:17 fedora systemd-resolved[795]: Freeing transaction 11345. Feb 14 19:44:17 fedora systemd-resolved[795]: Received dns UDP packet of size 152, ifindex=3, ttl=0, fragsize=0, sender=75.75.75.75, destination=10.0.0.85 Feb 14 19:44:17 fedora systemd-resolved[795]: Processing incoming packet of size 152 on transaction 62536 (rcode=SUCCESS). Feb 14 19:44:17 fedora systemd-resolved[795]: Added NODATA cache entry for locprod2-elb-us-west-2.prod.mozaws.net IN AAAA 267s Feb 14 19:44:17 fedora systemd-resolved[795]: Regular transaction 62536 for <locprod2-elb-us-west-2.prod.mozaws.net IN AAAA> on scope dns on wlp0s20f3/* now complete with <success> from network (unsigned; non-confidential). Feb 14 19:44:17 fedora systemd-resolved[795]: Freeing transaction 25067. Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Sending message: {"parameters":{"addresses":[{"ifindex":3,"family":2,"address":[52,40,22,163]},{"ifindex":3,"family":2,"address":[34,217,232,122]},{"ifindex":3,"family":2,"address":[54,187,53,15]},{"ifindex":3,"family":2,"address":[52,89,43,233]},{"ifindex":3,"family":2,"address":[54,187,205,23]},{"ifindex":3,"family":2,"address":[35,161,134,161]}],"name":"locprod2-elb-us-west-2.prod.mozaws.net","flags":9437185}} Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Changing state pending-method → idle-server Feb 14 19:44:17 fedora systemd-resolved[795]: Freeing transaction 62536. Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Got POLLHUP from socket. Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Changing state idle-server → pending-disconnect Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Changing state pending-disconnect → processing-disconnect Feb 14 19:44:17 fedora systemd-resolved[795]: varlink-22: Changing state processing-disconnect → disconnected Feb 14 19:44:59 fedora sudo[6973]: chris : TTY=pts/2 ; PWD=/home/chris ; USER=root ; COMMAND=/usr/bin/systemctl restart systemd-resolved Expected results: Should continue to resolve web pages Additional info:
Could be any of: https://github.com/systemd/systemd/issues/21815 https://github.com/systemd/systemd/issues/21883 https://github.com/systemd/systemd/issues/22401
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