Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1818527
Title:
Stub resolver cache is corrupted
Status in systemd package in Ubuntu:
Confirmed
Bug description:
It seems that when systemd-resolve cache an non-existent CNAME record
for a domain, any attempt to resolve A record for the same domain
fail.
systemd version the issue has been seen with
Installed: 237-3ubuntu10.13
Used distribution
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic
Expected behaviour you didn't see
Return A record for a domain when it exists.
Unexpected behaviour you saw
Resolution failed.
Steps to reproduce the problem
Whait for 1 minutes (github.com TTL for A record)
Try to resolv github.com CNAME record dig CNAME github.com
This will return an empty result.
Then try to resolve github.com A record dig A github.com.
This will now return empty result unless you restart systemd-resolved
or wait for cache expiration.
At the same time using another DNS will resolve correctly dig A
github.com @8.8.8.8.
Exemple :
Wait for 1 minutes to let cache expire, then run
dig CNAME github.com
dig A github.com
# no result
dig A github.com @8.8.8.8
# ;; ANSWER SECTION:
# github.com. 59 IN A 192.30.253.113
# github.com. 59 IN A 192.30.253.112
PS: Don't forget to restart systemd-resolve, before trying to post an
answer.
This bug was first reported in github
https://github.com/systemd/systemd/issues/11789 but systemd version in
ubuntu is too old.
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