snapd/2.57.1+22.10.1 ADT test failure with linux-raspi/5.19.0-1002.6

[Juerg Haefliger]

Testing failed on:
    arm64: https://autopkgtest.ubuntu.com/results/autopkgtest-kinetic/kinetic/arm64/s/snapd/20221003_171436_6321f@/log.gz

The tail of such a failure:

+ snap install --classic go
2022-10-03T17:10:59Z INFO Waiting for automatic snapd restart...
go 1.18.5 from Michael Hudson-Doyle (mwhudson) installed
+ export GOPATH=/tmp/go
+ /snap/bin/go install github.com/snapcore/spread/cmd/spread@latest
go: downloading github.com/snapcore/spread v0.0.0-20211206135717-b426a3f04d80
go: downloading github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e
go: downloading github.com/kr/text v0.1.0
go: downloading golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97
go: downloading golang.org/x/net v0.0.0-20210716203947-853a461950ff
go: downloading golang.org/x/oauth2 v0.0.0-20210628180205-a41e5a781914
go: downloading gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637
go: downloading gopkg.in/yaml.v2 v2.4.0
go: downloading golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1
go: downloading cloud.google.com/go v0.65.0
go: downloading golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1
+ groupadd --gid 12345 test
+ adduser --uid 12345 --gid 12345 --disabled-password --gecos test
Adding user `test' ...
Adding new user `test' (12345) with group `test' ...
Creating home directory `/home/test' ...
Copying files from `/etc/skel' ...
+ cat
+ /tmp/go/bin/spread -v autopkgtest:adt-local:tests/smoke/
2022-10-03 17:13:16 Found /tmp/autopkgtest.WgVVbr/build.gDT/src/spread.yaml.
2022-10-03 17:13:20 Project content is packed for delivery (11.01MB).
2022-10-03 17:13:20 Sequence of jobs produced with -seed=1664817200
2022-10-03 17:13:20 If killed, discard servers with: spread -reuse-pid=3216 -discard
2022-10-03 17:13:20 Allocating autopkgtest:adt-local...
2022-10-03 17:13:20 Waiting for autopkgtest:adt-local to make SSH available at localhost:22...
2022-10-03 17:13:20 Allocated autopkgtest:adt-local.
2022-10-03 17:13:20 Connecting to autopkgtest:adt-local...
2022-10-03 17:14:20 Discarding autopkgtest:adt-local, cannot connect: cannot connect to autopkgtest:adt-local: ssh: handshake failed: ssh: unable to authenticate, attempted methods [none], no supported methods remain
2022-10-03 17:14:20 Successful tasks: 0
2022-10-03 17:14:20 Aborted tasks: 4
error: unsuccessful run
autopkgtest [17:14:20]: test integrationtests: -----------------------]
integrationtests FAIL non-zero exit status 1
autopkgtest [17:14:21]: test integrationtests: - - - - - - - - - - results - - - - - - - - - -
autopkgtest [17:14:22]: @@@@@@@@@@@@@@@@@@@@ summary
integrationtests FAIL non-zero exit status 1

[Juerg Haefliger (juergh)]

This seems to be related to how snapd autopkgtest modifies the sshd_config file.

t's unclear though why this works on some kernels but not on others.

Bad test: https://autopkgtest.ubuntu.com/results/autopkgtest-kinetic/kinetic/arm64/s/snapd/20221003_171436_6321f@/log.gz

Good test: https://autopkgtest.ubuntu.com/results/autopkgtest-kinetic/kinetic/arm64/s/snapd/20221004_094939_71bd2@/log.gz

[Juerg Haefliger (juergh)]

This snippet in debian/tests/integrationtests looks suspicious:

# ensure we can do a connect to localhost
echo ubuntu:ubuntu|chpasswd
sed -i 's/\(PermitRootLogin\|PasswordAuthentication\)\>.*/\1 yes/' /etc/ssh/sshd_config
systemctl reload ssh.service

The statement seems to modify commented lines...
And there's also:

$ cat /etc/ssh/sshd_config.d/60-cloudimg-settings.conf
PasswordAuthentication no

[Juerg Haefliger (juergh)]

Maybe related: https://github.com/snapcore/spread/pull/155

[Utkarsh Gupta (utkarsh)]

Ubuntu 22.10 (Kinetic Kudu) has reached end of life, so this bug will not be fixed for that specific release.