This bug was fixed in the package systemd - 243-3ubuntu1
---------------
systemd (243-3ubuntu1) focal; urgency=medium
[ Dan Streetman ]
* Fix resolved fallback to TCP (LP: #1849658)
Author: Dan Streetman
File:
debian/patches/resolved-set-stream-type-during-DnsStream-creation.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=f1ee30b13c9d2d34968b09ce620f3bc24a1a78c7
* Separate stderr and stdout of /etc/dhcp/dhclient-enter-hooks.d/resolved
(LP: #1849608)
Author: Dan Streetman
File: debian/extra/dhclient-enter-resolved-hook
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=fec4d6d026488a1d32ad9dceef18d9ea9c8acbda
[ Balint Reczey ]
* Merge to Ubuntu from Debian experimental
* Refresh patches:
- Dropped changes:
* udevadm trigger: do not propagate EACCES and ENODEV.
File:
debian/patches/udevadm-trigger-do-not-propagate-EACCES-and-ENODEV.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=334e3fdc904de05105c78763c88220c1976d1946
* Pass personality test even when i386 userland runs on amd64 kernel
File:
debian/patches/debian/UBUNTU-test-Pass-personality-test-even-when-i386-userland-runs-o.patch
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=42e0bfc426f19430f6768ef4922a9531a345765f
systemd (243-3) experimental; urgency=medium
* Import patches from v243-stable branch (up to ef677436aa)
-- Balint Reczey <rbal...@ubuntu.com> Wed, 30 Oct 2019 15:19:33 +0100
** Changed in: systemd (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1849658
Title:
resolved fallback to TCP fails for truncated UDP replies
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Disco:
In Progress
Status in systemd source package in Eoan:
In Progress
Status in systemd source package in Focal:
Fix Released
Bug description:
[impact]
for DNS UDP replies larger than 512 bytes, fallback to TCP is used.
For example 'host toomany.ddstreet.org'.
Due to a bug in resolved in refcounting DNS stream types, the refcount
underflows for type 0 streams (which resolved uses to talk to upstream
nameservers), resulting in resolved being unable to fallback to TCP to
handle truncated UDP replies.
[test case]
ubuntu@sf247344-upstream:~$ dig +noanswer +noedns toomany.ddstreet.org
;; Truncated, retrying in TCP mode.
; <<>> DiG 9.11.3-1ubuntu1.9-Ubuntu <<>> +noanswer +noedns
toomany.ddstreet.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2683
;; flags: qr rd ra; QUERY: 1, ANSWER: 40, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;toomany.ddstreet.org. IN A
;; Query time: 0 msec
;; SERVER: 127.0.0.53#53(127.0.0.53)
;; WHEN: Thu Oct 24 11:40:29 UTC 2019
;; MSG SIZE rcvd: 678
ubuntu@sf247344-upstream:~$ sudo resolvectl flush-caches
ubuntu@sf247344-upstream:~$ dig +noanswer +noedns toomany.ddstreet.org
; <<>> DiG 9.11.3-1ubuntu1.9-Ubuntu <<>> +noanswer +noedns
toomany.ddstreet.org
;; global options: +cmd
;; connection timed out; no servers could be reached
[regression potential]
very low, as this only properly sets the stream type in the DnsStream
object; any regression would be a failure to be able to use TCP for
DNS requests or replies.
[other info]
https://github.com/systemd/systemd/pull/13838
The commit adding stream types is not present in x/b, so this is
needed only for disco and later.
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