Thanks for the info Michael,
without steps to reproduce I see two paths from here.
## #1 trying different versions
As Paride asked it might be worth to check different versions.
There is no super-convenient way to downgrade bind9
You can add all of Bionics (or any other release in between cosmic, disco,
eoan) to apt like:
root@f:~# cp /etc/apt/sources.list /etc/apt/sources.list.d/bionic.list
root@f:~# vim /etc/apt/sources.list.d/bionic.list
# herein replace all "focal" with bionic
root@f:~# apt update
root@f:~# apt-cache policy bind9
bind9:
Installed: (none)
Candidate: 1:9.16.1-0ubuntu2.9
Version table:
1:9.16.1-0ubuntu2.9 500
500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
1:9.16.1-0ubuntu2 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
1:9.11.3+dfsg-1ubuntu1.16 500
500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
1:9.11.3+dfsg-1ubuntu1 500
500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
# A downgrade to bionics 9.11.3 would then be:
root@f:~# v=1:9.11.3+dfsg-1ubuntu1.16; apt install bind9=$v bind9utils=$v
# Warning, this might mess up your dependencies and installed packages, I'd
recommend doing this on a test system or with a full backup to restore after
testing.
## #2 Full debugging
As you report that your offsets seem to be reliable aou could try to
attach a full crash of bind9 if it generates one.
So if there is /var/crash/...bind9...crash
then try running
$ sudo apport-collect 1954854
That should attach all logs and version information.
Then (if not auto-attached) add the crash file as well.
We could then try to get a full gdb backtrace, maybe that indicates an obvious
issue or an error known by upstream.
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https://bugs.launchpad.net/bugs/1954854
Title:
bind 9.16.1-ubuntu on ubuntu 20.04 randomly exits with segfault signal
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