Unable to build custom kernel module in 2605.10.0

[mindw]

Description

Build of a custom kernel module fails on 2605.10.0 - the same process is successful on 2605.8.0

This is the outcome of #298

Impact

Workaround is available otherwise production env is dependant on the module in question - blocked from upgrading.

Environment and steps to reproduce

1. Set-up: spin up Flatcar EC2 instance in AWS using ami-01005e70742a799fe
2. Task: build wireguard custom kernel module 1.0.20201112 for Flatcar 2605.10
3. Action(s): [ sequence of actions that triggered the bug, see example below ]

[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + export WIREGUARD_VERSION=1.0.20201112
[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + WIREGUARD_VERSION=1.0.20201112
[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + modules=/opt/modules
[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + mkdir -p /opt/modules /opt/modules.wd
[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + mount -o lowerdir=/lib/modules,upperdir=/opt/modules,workdir=/opt/modules.wd -t overlay overlay /lib/modules
[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + systemctl enable lib-modules.mount
[2020-12-09T00:27:08.532Z] �[0m�[0mnull_resource.run_install_script (remote-exec): Created symlink /etc/systemd/system/local-fs.target.wants/lib-modules.mount → /etc/systemd/system/lib-modules.mount.
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + . /usr/share/flatcar/release
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): ++ FLATCAR_RELEASE_VERSION=2605.10.0
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): ++ FLATCAR_RELEASE_BOARD=amd64-usr
...
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + . /usr/share/flatcar/update.conf
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): ++ SERVER=https://public.update.flatcar-linux.net/v1/update/
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): ++ GROUP=stable
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + url=https://stable.release.flatcar-linux.net/amd64-usr/2605.9.0/flatcar_developer_container.bin.bz2
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + curl -L https://stable.release.flatcar-linux.net/amd64-usr/2605.9.0/flatcar_developer_container.bin.bz2
[2020-12-09T00:27:08.791Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + bzip2 -d
...
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + src_dir=/home/core/coreos_src
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): ++ pwd
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + var_tmp_dir=/home/core/coreos_var_tmp
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + mkdir -p /home/core/coreos_src /home/core/coreos_var_tmp
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + sed -i s/_wireguard_version_/1.0.20201112/ /tmp/installer.sh
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + systemd-nspawn --bind=/lib/modules --bind=/tmp --overlay=/home/core/coreos_src::/usr/src --overlay=/home/core/coreos_var_tmp::/var/tmp --image=flatcar_developer_container.bin /tmp/installer.sh
...
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + src_dir=/home/core/coreos_src
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): ++ pwd
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + var_tmp_dir=/home/core/coreos_var_tmp
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + mkdir -p /home/core/coreos_src /home/core/coreos_var_tmp
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + sed -i s/_wireguard_version_/1.0.20201112/ /tmp/installer.sh
[2020-12-09T00:29:30.219Z] �[0m�[0mnull_resource.run_install_script (remote-exec): + systemd-nspawn --bind=/lib/modules --bind=/tmp --overlay=/home/core/coreos_src::/usr/src --overlay=/home/core/coreos_var_tmp::/var/tmp --image=flatcar_developer_container.bin /tmp/installer.sh
...
2020-12-09T00:30:04.691Z] �[0m�[1mnull_resource.run_install_script: Still creating... (3m30s elapsed)�[0m�[0m
[2020-12-09T00:30:05.257Z] �[0m�[0mnull_resource.run_install_script (remote-exec): >>> Git clone in /var/lib/portage/portage-stable successful
[2020-12-09T00:30:05.257Z] �[0m�[0mnull_resource.run_install_script (remote-exec): Warning: No revision found for https://github.com/flatcar-linux/coreos-overlay.git
[2020-12-09T00:30:05.257Z] �[0m�[0mnull_resource.run_install_script (remote-exec): >>> Cloning repository 'coreos' from 'https://github.com/flatcar-linux/coreos-overlay.git'...
[2020-12-09T00:30:05.257Z] �[0m�[0mnull_resource.run_install_script (remote-exec): >>> Starting git clone in /var/lib/portage/coreos-overlay
[2020-12-09T00:30:05.257Z] �[0m�[0mnull_resource.run_install_script (remote-exec): Cloning into '/var/lib/portage/coreos-overlay'...
...
[2020-12-09T00:30:11.924Z] �[0m�[0mnull_resource.run_install_script (remote-exec): >>> Git clone in /var/lib/portage/coreos-overlay successful

4. Error: [describe the error that was triggered]

[2020-12-17T00:33:08.184Z] null_resource.run_install_script (remote-exec):   CC [M]  /wireguard-linux-compat-1.0.20201112/src/crypto/zinc/chacha20/chacha20.o
[2020-12-17T00:33:09.118Z] null_resource.run_install_script (remote-exec):   PERLASM /wireguard-linux-compat-1.0.20201112/src/crypto/zinc/chacha20/chacha20-x86_64.S
[2020-12-17T00:33:09.376Z] null_resource.run_install_script (remote-exec): /bin/sh: line 1: 30227 Segmentation fault      (core dumped) perl /wireguard-linux-compat-1.0.20201112/src/crypto/zinc/chacha20/chacha20-x86_64.pl > /wireguard-linux-compat-1.0.20201112/src/crypto/zinc/chacha20/chacha20-x86_64.S
[2020-12-17T00:33:09.376Z] null_resource.run_install_script (remote-exec): make[2]: *** [/wireguard-linux-compat-1.0.20201112/src/crypto/Kbuild.include:43: /wireguard-linux-compat-1.0.20201112/src/crypto/zinc/chacha20/chacha20-x86_64.S] Error 139

Expected behavior
build is successful

Additional information
Adding emerge perl allows building wireguard kernel module

[pothos]

echo 'print("Hello, World!\n");' | perl works in the current Stable's developer container, please reopen if there are still any crashes.