K3s crashes on startup on Debian Bullseye

[optix2000]

Environmental Info:
K3s Version:

# k3s --version
k3s version v1.20.2+k3s1 (1d4adb03)

Node(s) CPU architecture, OS, and Version:
x86_64
Debian Bullseye

# uname -a
Linux test 5.10.0-2-amd64 #1 SMP Debian 5.10.9-1 (2021-01-20) x86_64 GNU/Linux

Cluster Configuration:

Single node

Describe the bug:

K3s crashes on startup on Debian Bullseye. Tried and reproduced on both VPSes and physical servers.

Steps To Reproduce:

• Find favorite VPS provider with Debian Buster (10) and upgrade to Debian Bullseye (11)

echo "
deb http://deb.debian.org/debian/ bullseye main
deb http://security.debian.org/debian-security bullseye-security main
deb http://deb.debian.org/debian/ bullseye-updates main
" > /etc/apt/sources.list
apt update
apt dist-upgrade
# follow upgrade prompts
reboot

• Installed K3s: curl -sfL https://get.k3s.io | sh -s -
• Also tried with --flannel-backend=none --disable traefik --disable servicelb --disable local-storage --disable-network-policy --disable-cloud-controller, but it didn't change anything.

Expected behavior:

No crash on startup.

Actual behavior:

K3s crashes on startup

Additional context / logs:

~ % curl -sfL https://get.k3s.io | sh -s -
[INFO]  Finding release for channel stable
[INFO]  Using v1.20.2+k3s1 as release
[INFO]  Downloading hash https://github.com/rancher/k3s/releases/download/v1.20.2+k3s1/sha256sum-amd64.txt
[INFO]  Downloading binary https://github.com/rancher/k3s/releases/download/v1.20.2+k3s1/k3s
[INFO]  Verifying binary download
[INFO]  Installing k3s to /usr/local/bin/k3s
[INFO]  Creating /usr/local/bin/kubectl symlink to k3s
[INFO]  Creating /usr/local/bin/crictl symlink to k3s
[INFO]  Creating /usr/local/bin/ctr symlink to k3s
[INFO]  Creating killall script /usr/local/bin/k3s-killall.sh
[INFO]  Creating uninstall script /usr/local/bin/k3s-uninstall.sh
[INFO]  env: Creating environment file /etc/systemd/system/k3s.service.env
[INFO]  systemd: Creating service file /etc/systemd/system/k3s.service
[INFO]  systemd: Enabling k3s unit
Created symlink /etc/systemd/system/multi-user.target.wants/k3s.service → /etc/systemd/system/k3s.service.
[INFO]  systemd: Starting k3s
Job for k3s.service failed because the control process exited with error code.
See "systemctl status k3s.service" and "journalctl -xe" for details.

journalctl -u k3s > k3s.log

[optix2000]

Digging deeper this looks related to #900 and confirmed fixed in #2844.